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Khosrowabadi E, Mignon-Ravix C, Riccardi F, Cacciagli P, Desnous B, Sigaudy S, Milh M, Villard L, Kjellén L, Molinari F. Loss of NDST1 N-sulfotransferase activity is associated with autosomal recessive intellectual disability. Hum Mol Genet 2024; 33:520-529. [PMID: 38129107 DOI: 10.1093/hmg/ddad203] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2023] [Revised: 10/11/2023] [Accepted: 11/22/2023] [Indexed: 12/23/2023] Open
Abstract
Intellectual Disability (ID) is the major cause of handicap, affecting nearly 3% of the general population, and is highly genetically heterogenous with more than a thousand genes involved. Exome sequencing performed in two independent families identified the same missense variant, p.(Gly611Ser), in the NDST1 (N-deacetylase/N-sulfotransferase member 1) gene. This variant had been previously found in ID patients of two other families but has never been functionally characterized. The NDST1 gene encodes a bifunctional enzyme that catalyzes both N-deacetylation and N-sulfation of N-acetyl-glucosamine residues during heparan sulfate (HS) biosynthesis. This step is essential because it influences the downstream enzymatic modifications and thereby determines the overall structure and sulfation degree of the HS polysaccharide chain. To discriminate between a rare polymorphism and a pathogenic variant, we compared the enzymatic properties of wild-type and mutant NDST1 proteins. We found that the p.(Gly611Ser) variant results in a complete loss of N-sulfotransferase activity while the N-deacetylase activity is retained. NDST1 shows the highest and the most homogeneous expression in the human cerebral structures compared to the other members of the NDST gene family. These results indicate that a loss of NDST1 N-sulfation activity is associated with impaired cognitive functions.
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Affiliation(s)
- Elham Khosrowabadi
- Department of Medical Biochemistry and Microbiology, The Biomedical Center, Husargatan 3, 751 23 Uppsala, Sweden
| | - Cécile Mignon-Ravix
- Aix-Marseille Univ, INSERM, MMG, Centre de génétique médicale de Marseille, 27 Bd Jean Moulin, 13385 Marseille Cedex 05, France
| | - Florence Riccardi
- Aix-Marseille Univ, INSERM, MMG, Centre de génétique médicale de Marseille, 27 Bd Jean Moulin, 13385 Marseille Cedex 05, France
- Département de Génétique Médicale, Hôpital Ste Musse, 54 Rue Henri Sainte-Claire Deville, 83100 Toulon, France
| | - Pierre Cacciagli
- Biological Resource Center, Assistance Publique des Hôpitaux de Marseille, Hôpital Timone Enfants, 264 rue Saint Pierre, 13385 Marseille cedex 05, France
| | - Béatrice Desnous
- Service de Neuropédiatrie, AP-HM, Hôpital Timone Enfants, 264 rue Saint Pierre, 13385 Marseille cedex 05, France
| | - Sabine Sigaudy
- Service de Génétique Clinique, AP-HM, Hôpital Timone Enfants, 264 rue Saint Pierre, 13385 Marseille cedex 05, France
| | - Mathieu Milh
- Aix-Marseille Univ, INSERM, MMG, Centre de génétique médicale de Marseille, 27 Bd Jean Moulin, 13385 Marseille Cedex 05, France
- Service de Neuropédiatrie, AP-HM, Hôpital Timone Enfants, 264 rue Saint Pierre, 13385 Marseille cedex 05, France
| | - Laurent Villard
- Aix-Marseille Univ, INSERM, MMG, Centre de génétique médicale de Marseille, 27 Bd Jean Moulin, 13385 Marseille Cedex 05, France
- Département de Génétique Médicale, AP-HM, Hôpital Timone Enfants, 264 rue Saint Pierre, 13385 Marseille cedex 05, France
| | - Lena Kjellén
- Department of Medical Biochemistry and Microbiology, The Biomedical Center, Husargatan 3, 751 23 Uppsala, Sweden
| | - Florence Molinari
- Aix-Marseille Univ, INSERM, MMG, Centre de génétique médicale de Marseille, 27 Bd Jean Moulin, 13385 Marseille Cedex 05, France
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Abaji M, Mignon-Ravix C, Gorokhova S, Cacciagli P, Mortreux J, Molinari F, Chabrol B, Sigaudy S, Villard L, Riccardi F. TRAPPC2L-related disorder: first homozygous protein-truncating variant and further delineation of the phenotype. J Med Genet 2023; 60:1021-1025. [PMID: 36849228 DOI: 10.1136/jmg-2022-108677] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2022] [Accepted: 02/15/2023] [Indexed: 03/01/2023]
Abstract
The TRAPP (TRAfficking Protein Particle) complexes are evolutionarily conserved tethering factors involved in the intracellular transport of vesicles for secretion and autophagy processes. Pathogenic variants in 8 genes (of 14) encoding TRAPP proteins are involved in ultra-rare human diseases, called TRAPPopathies. Seven of them are autosomal recessive neurodevelopmental disorders with overlapping phenotypes. Since 2018, two homozygous missense variants in TRAPPC2L have been reported in five individuals from three unrelated families with early-onset and progressive encephalopathy, with episodic rhabdomyolysis. We now describe the first pathogenic protein-truncating variant in the TRAPPC2L gene found at a homozygous state in two affected siblings. This report provides key genetic evidence invaluable to establishing the gene-disease relationship for this gene and important insights into the TRAPPC2L phenotype. Regression, seizures and postnatal microcephaly initially described are not constant features. Acute episodes of infection do not contribute to the neurological course. HyperCKaemia is part of the clinical picture. Thus, TRAPPC2L syndrome is mainly characterised by a severe neurodevelopmental disorder and a variable degree of muscle involvement, suggesting that it belongs to the clinical entity of rare congenital muscular dystrophies.
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Affiliation(s)
- Mario Abaji
- Génétique Médicale, AP-HM, Marseille, France
- MMG, U1251, Inserm, Aix-Marseille Universite, Marseille, France
| | | | - Svetlana Gorokhova
- Génétique Médicale, AP-HM, Marseille, France
- MMG, U1251, Inserm, Aix-Marseille Universite, Marseille, France
| | - Pierre Cacciagli
- CRB, TAC, Assistance Publique Hopitaux de Marseille, Marseille, France
| | | | | | | | | | - Laurent Villard
- Génétique Médicale, AP-HM, Marseille, France
- MMG, U1251, Inserm, Aix-Marseille Universite, Marseille, France
| | - Florence Riccardi
- MMG, U1251, Inserm, Aix-Marseille Universite, Marseille, France
- Génétique Médicale, Centre Hospitalier Intercommunal Toulon - La Seyne-sur-Mer, Toulon, France
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Engel C, Valence S, Delplancq G, Maroofian R, Accogli A, Agolini E, Alkuraya FS, Baglioni V, Bagnasco I, Becmeur-Lefebvre M, Bertini E, Borggraefe I, Brischoux-Boucher E, Bruel AL, Brusco A, Bubshait DK, Cabrol C, Cilio MR, Cornet MC, Coubes C, Danhaive O, Delague V, Denommé-Pichon AS, Di Giacomo MC, Doco-Fenzy M, Engels H, Cremer K, Gérard M, Gleeson JG, Heron D, Goffeney J, Guimier A, Harms FL, Houlden H, Iacomino M, Kaiyrzhanov R, Kamien B, Karimiani EG, Kraus D, Kuentz P, Kutsche K, Lederer D, Massingham L, Mignot C, Morris-Rosendahl D, Nagarajan L, Odent S, Ormières C, Partlow JN, Pasquier L, Penney L, Philippe C, Piccolo G, Poulton C, Putoux A, Rio M, Rougeot C, Salpietro V, Scheffer I, Schneider A, Srivastava S, Straussberg R, Striano P, Valente EM, Venot P, Villard L, Vitobello A, Wagner J, Wagner M, Zaki MS, Zara F, Lesca G, Yassaee VR, Miryounesi M, Hashemi-Gorji F, Beiraghi M, Ashrafzadeh F, Galehdari H, Walsh C, Novelli A, Tacke M, Sadykova D, Maidyrov Y, Koneev K, Shashkin C, Capra V, Zamani M, Van Maldergem L, Burglen L, Piard J. BRAT1-related disorders: phenotypic spectrum and phenotype-genotype correlations from 97 patients. Eur J Hum Genet 2023; 31:1023-1031. [PMID: 37344571 PMCID: PMC10474045 DOI: 10.1038/s41431-023-01410-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2022] [Revised: 04/26/2023] [Accepted: 06/07/2023] [Indexed: 06/23/2023] Open
Abstract
BRAT1 biallelic variants are associated with rigidity and multifocal seizure syndrome, lethal neonatal (RMFSL), and neurodevelopmental disorder associating cerebellar atrophy with or without seizures syndrome (NEDCAS). To date, forty individuals have been reported in the literature. We collected clinical and molecular data from 57 additional cases allowing us to study a large cohort of 97 individuals and draw phenotype-genotype correlations. Fifty-nine individuals presented with BRAT1-related RMFSL phenotype. Most of them had no psychomotor acquisition (100%), epilepsy (100%), microcephaly (91%), limb rigidity (93%), and died prematurely (93%). Thirty-eight individuals presented a non-lethal phenotype of BRAT1-related NEDCAS phenotype. Seventy-six percent of the patients in this group were able to walk and 68% were able to say at least a few words. Most of them had cerebellar ataxia (82%), axial hypotonia (79%) and cerebellar atrophy (100%). Genotype-phenotype correlations in our cohort revealed that biallelic nonsense, frameshift or inframe deletion/insertion variants result in the severe BRAT1-related RMFSL phenotype (46/46; 100%). In contrast, genotypes with at least one missense were more likely associated with NEDCAS (28/34; 82%). The phenotype of patients carrying splice variants was variable: 41% presented with RMFSL (7/17) and 59% with NEDCAS (10/17).
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Affiliation(s)
- Camille Engel
- Centre de Génétique Humaine, Centre Hospitalier Régional Universitaire, Université de Franche-Comté, Besançon, France.
| | - Stéphanie Valence
- Service de Neurologie Pédiatrique, Hôpital Armand Trousseau, APHP Sorbonne Université, Paris, France
| | - Geoffroy Delplancq
- Centre de Génétique Humaine, Centre Hospitalier Régional Universitaire, Université de Franche-Comté, Besançon, France
| | - Reza Maroofian
- Department of Neuromuscular Diseases UCL Queen Square Institute of Neurology, University College London, London, UK
| | - Andrea Accogli
- Department of Specialized Medicine, Division of Medical Genetics, McGill University Health Centre, Montreal, QC, Canada
| | - Emanuele Agolini
- Laboratory of Medical Genetics, Translational Cytogenomics Research Unit, Bambino Gesù Children's Hospital, IRCCS, Rome, Italy
| | - Fowzan S Alkuraya
- Department of Translational Genomics, Center for Genomic Medicine, King Faisal Specialist Hospital and Research Center, Riyadh, Saudi Arabia
| | - Valentina Baglioni
- Department of Human Neurosciences, Institute of Child and Adolescent Neuropsychiatry, Sapienza University of Rome, Rome, Italy
| | - Irene Bagnasco
- Division of Neuropsychiatry, Epilepsy Center for Children, Martini Hospital, 10141, Turin, Italy
| | | | - Enrico Bertini
- Unit of Neuromuscular and Neurodegenerative Disorders, Department of Neurosciences, Bambino Gesù Children's Hospital IRCCS, Rome, Italy
| | - Ingo Borggraefe
- Department of Pediatric Neurology, Developmental Medicine and Social Pediatrics, University of Munich, 80337, Munich, Germany
| | - Elise Brischoux-Boucher
- Centre de Génétique Humaine, Centre Hospitalier Régional Universitaire, Université de Franche-Comté, Besançon, France
| | - Ange-Line Bruel
- UMR 1231 GAD, Inserm, Université de Bourgogne Franche Comté, Dijon, France
- Unité Fonctionnelle Innovation en Diagnostic Génomique des Maladies Rares, FHU-TRANSLAD, CHU Dijon Bourgogne, Dijon, France
| | - Alfredo Brusco
- Department of Medical Sciences, University of Torino, 10126, Turin, Italy
| | - Dalal K Bubshait
- Department of Pediatrics, College of Medicine, Imam Abdulrahman Bin Faisal University, Dammam, Saudi Arabia
| | - Christelle Cabrol
- Centre de Génétique Humaine, Centre Hospitalier Régional Universitaire, Université de Franche-Comté, Besançon, France
| | - Maria Roberta Cilio
- Department of Pediatrics, Division of Pediatric Neurology Saint-Luc University Hospital, and Institute of Neuroscience (IoNS), Catholic University of Louvain, Brussels, Belgium
| | - Marie-Coralie Cornet
- Department of Pediatrics, Division of Neonatology, University of California San Francisco, San Francisco, CA, USA
| | - Christine Coubes
- Département de Génétique Médicale, Maladies Rares et Médecine Personnalisée, Hôpital Arnaud de Villeneuve, CHU de Montpellier, Montpellier, France
| | - Olivier Danhaive
- Division of Neonatology, Saint-Luc university Hospital, and Institut of Clinical and Experimental Research (IREC), Bruxelles, Belgium
| | - Valérie Delague
- Aix Marseille Univ, INSERM, Marseille Medical Genetics Center, MMG, Marseille, France
| | - Anne-Sophie Denommé-Pichon
- UMR 1231 GAD, Inserm, Université de Bourgogne Franche Comté, Dijon, France
- Unité Fonctionnelle Innovation en Diagnostic Génomique des Maladies Rares, FHU-TRANSLAD, CHU Dijon Bourgogne, Dijon, France
| | - Marilena Carmela Di Giacomo
- Medical Genetics Service and Laboratory of Cytogenetics, SIC Anatomia Patologica, "San Carlo" Hospital, 85100, Potenza, Italy
| | - Martine Doco-Fenzy
- CHU Reims, Service de Génétique, Reims, France
- CHU de Nantes, service de génétique médicale, Nantes, France
- L'institut du thorax, INSERM, UNIV Nantes, Nantes, France
| | - Hartmut Engels
- Institute of Human Genetics, University of Bonn, School of Medicine & University Hospital Bonn, Bonn, Germany
| | - Kirsten Cremer
- Institute of Human Genetics, University of Bonn, School of Medicine & University Hospital Bonn, Bonn, Germany
| | - Marion Gérard
- Clinical Genetics, Côte de Nacre University Hospital Center, Caen, France
| | - Joseph G Gleeson
- University of California San Diego, Department of Neurosciences, Rady Children's Institute for Genomic Medicine, San Diego, CA, 92037, USA
| | - Delphine Heron
- Department of Genetics, Pitié-Salpêtrière Hospital, AP-HP, Sorbonne University, Paris, France
| | - Joanna Goffeney
- Service de neuropédiatrie, Centre Hospitalier Régional Universitaire, Université de Franche-Comté, Besançon, France
| | - Anne Guimier
- Service de Médecine Génomique des Maladies Rares, Hôpital Necker Enfants Malades, Institut Imagine et Université Paris-Cité, Paris, France
| | - Frederike L Harms
- Institute of Human Genetics, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Henry Houlden
- Department of Neuromuscular Diseases UCL Queen Square Institute of Neurology, University College London, London, UK
| | - Michele Iacomino
- Unit of Medical Genetics, IRCCS Instituto Giannina Gaslini, Genova, Italy
| | - Rauan Kaiyrzhanov
- Department of Neuromuscular Diseases UCL Queen Square Institute of Neurology, University College London, London, UK
| | - Benjamin Kamien
- Genetic Services of Western Australia, King Edward Memorial Hospital, Perth, WA, 6008, Australia
| | - Ehsan Ghayoor Karimiani
- Department of Molecular Genetics, Next Generation Genetic Polyclinic, Mashhad, Iran
- Molecular and Clinical Sciences Institute, St. George's, University of London, Cranmer Terrace, London, SW17 0RE, UK
| | - Dror Kraus
- Department of Neurology, Schneider Children's Medical Center of Israel, Petah Tiqva, Israel
- Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, 6997801, Israel
| | - Paul Kuentz
- UMR 1231 GAD, Inserm, Université de Bourgogne Franche Comté, Dijon, France
- Oncobiologie Génétique Bioinformatique, PCBio, CHU Besançon, Besançon, France
| | - Kerstin Kutsche
- Institute of Human Genetics, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Damien Lederer
- Institute for Pathology and Genetics, 6040, Gosselies, Belgium
| | - Lauren Massingham
- Division of Medical Genetics, Department of Pediatrics, Hasbro Children's Hospital, Providence, RI, USA
| | - Cyril Mignot
- APHP, Sorbonne Université, Département de Génétique, Paris, France
- Centre de Référence Déficiences Intellectuelles de Causes Rares, GH Pitié-Salpêtrière/Hôpital Armand Trousseau, Paris, France
| | - Déborah Morris-Rosendahl
- Clinical Genetics and Genomics, Royal Brompton and Harefield NHS Foundation Trust, London, UK
- NHLI, Imperial College London, London, UK
| | - Lakshmi Nagarajan
- Department of Neurology, Perth Children's Hospital, Nedlands, WA, Australia
- University of Western Australia, Nedlands, WA, Australia
| | - Sylvie Odent
- Service de Génétique Clinique, Centre Référence "Déficiences Intellectuelles de causes rares" (CRDI), Centre Référence Anomalies du développement (CLAD-Ouest), CHU Rennes, Univ Rennes, Rennes, France
| | - Clothilde Ormières
- Service de Médecine Génomique des Maladies Rares, Hôpital Necker Enfants Malades, Institut Imagine et Université Paris-Cité, Paris, France
| | - Jennifer Neil Partlow
- Division of Genetics and Genomics and Howard Hughes Medical Institute, Boston Children's Hospital, Boston, MA, USA
| | - Laurent Pasquier
- Service de Génétique Clinique, Centre Référence "Déficiences Intellectuelles de causes rares" (CRDI), Centre Référence Anomalies du développement (CLAD-Ouest), CHU Rennes, Univ Rennes, Rennes, France
| | - Lynette Penney
- Department of Pediatrics, IWK Health Centre, Dalhousie University, Halifax, NS, Canada
| | - Christophe Philippe
- UMR 1231 GAD, Inserm, Université de Bourgogne Franche Comté, Dijon, France
- Unité Fonctionnelle Innovation en Diagnostic Génomique des Maladies Rares, FHU-TRANSLAD, CHU Dijon Bourgogne, Dijon, France
| | | | - Cathryn Poulton
- Genetic Services of Western Australia, King Edward Memorial Hospital, Perth, WA, 6008, Australia
| | - Audrey Putoux
- Hospices Civils de Lyon, Service de Génétique, Bron, France
- Équipe GENDEV, Centre de Recherche en Neurosciences de Lyon, INSERM U1028 CNRS UMR5292, Université Claude Bernard Lyon 1, Lyon, France
| | - Marlène Rio
- Service de Médecine Génomique des Maladies Rares, Hôpital Necker Enfants Malades, Institut Imagine et Université Paris-Cité, Paris, France
| | | | - Vincenzo Salpietro
- Department of Neuromuscular Diseases UCL Queen Square Institute of Neurology, University College London, London, UK
- IRCCS Giannina Gaslini Institute, Genova, Italy
- Department of Neurosciences, Rehabilitation, Ophthalmology, Genetics, Maternal and Child Health, University of Genova, Genova, Italy
| | - Ingrid Scheffer
- Department of Medicine, Austin Health, The University of Melbourne, Heidelberg, VIC, Australia
- Royal Children's Hospital, Florey Institute and Murdoch Children's Research Institute, Melbourne, VIC, Australia
| | - Amy Schneider
- Department of Medicine, Austin Health, The University of Melbourne, Heidelberg, VIC, Australia
| | | | - Rachel Straussberg
- Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, 6997801, Israel
| | - Pasquale Striano
- IRCCS Giannina Gaslini Institute, Genova, Italy
- Department of Neurosciences, Rehabilitation, Ophthalmology, Genetics, Maternal and Child Health, University of Genova, Genova, Italy
| | - Enza Maria Valente
- Department of Molecular Medicine, University of Pavia, Pavia, Italy
- Neurogenetics Research Center, IRCCS Mondino Foundation, Pavia, Italy
| | - Perrine Venot
- Neonatal Intensive Care Unit, Institut Alix de Champagne, Reims, France
| | - Laurent Villard
- Aix Marseille Univ, INSERM, Marseille Medical Genetics Center, MMG, Marseille, France
- Département de Génétique Médicale, AP-HM, Hôpital d'Enfants de La Timone, Marseille, France
| | - Antonio Vitobello
- UMR 1231 GAD, Inserm, Université de Bourgogne Franche Comté, Dijon, France
- Unité Fonctionnelle Innovation en Diagnostic Génomique des Maladies Rares, FHU-TRANSLAD, CHU Dijon Bourgogne, Dijon, France
| | - Johanna Wagner
- Department of Pediatric Neurology, Developmental Medicine and Social Pediatrics, University of Munich, 80337, Munich, Germany
| | - Matias Wagner
- Department of Pediatric Neurology, Developmental Medicine and Social Pediatrics, University of Munich, 80337, Munich, Germany
- Institute for Neurogenomics, Helmholtz Center Munich, Neuherberg, Germany
- Institute of Human Genetics, School of Medicine, Technical University Munich, Munich, Germany
| | - Maha S Zaki
- Clinical Genetics Department, Human Genetics and Genome Research Institute, National Research Centre, Cairo, Egypt
| | - Federizo Zara
- IRCCS Giannina Gaslini Institute, Genova, Italy
- Department of Neurosciences, Rehabilitation, Ophthalmology, Genetics, Maternal and Child Health, University of Genova, Genova, Italy
| | - Gaetan Lesca
- Hospices Civils de Lyon, Service de Génétique, Bron, France
- Pathophysiology and Genetics of Neuron and Muscle (PGNM, UCBL - CNRS UMR5261 - INSERM U1315), Université Claude Bernard Lyon 1, Lyon, France
| | - Vahid Reza Yassaee
- Genomic Research Center, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Mohammad Miryounesi
- Department of Medical Genetics, Faculty of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Farzad Hashemi-Gorji
- Genomic Research Center, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Mehran Beiraghi
- Department of Pediatrics, Faculty of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Farah Ashrafzadeh
- Department of Pediatrics, Faculty of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Hamid Galehdari
- Department of Biology, Faculty of Science, Shahid Chamran University of Ahvaz, Ahvaz, Iran
| | - Christopher Walsh
- Division of Genetics and Genomics and Howard Hughes Medical Institute, Boston Children's Hospital, Boston, MA, USA
| | - Antonio Novelli
- Laboratory of Medical Genetics, Translational Cytogenomics Research Unit, Bambino Gesù Children's Hospital, IRCCS, Rome, Italy
| | - Moritz Tacke
- Department of Pediatric Neurology, Developmental Medicine and Social Pediatrics, University of Munich, 80337, Munich, Germany
| | | | - Yerdan Maidyrov
- S. D. Asfendiyarov Kazakh National Medical University Almaty, Almaty, Kazakhstan
| | - Kairgali Koneev
- Department of Neurology and Neurosurgery, Asfendiyarov Kazakh National Medical University, Almaty, 050000, Kazakhstan
| | - Chingiz Shashkin
- Department of Neurology, The International Institute of Postraduate Education, Almaty, Kazakhstan
| | - Valeria Capra
- Unit of Medical Genetics, IRCCS Instituto Giannina Gaslini, Genova, Italy
| | - Mina Zamani
- Department of Biology, Faculty of Science, Shahid Chamran University of Ahvaz, Ahvaz, Iran
| | - Lionel Van Maldergem
- Centre de Génétique Humaine, Centre Hospitalier Régional Universitaire, Université de Franche-Comté, Besançon, France
| | - Lydie Burglen
- Centre de Référence des Malformations et Maladies Congénitales du Cervelet, Département de Génétique, AP-HP, Sorbonne Université, Hôpital Trousseau, Paris, France
| | - Juliette Piard
- Centre de Génétique Humaine, Centre Hospitalier Régional Universitaire, Université de Franche-Comté, Besançon, France
- UMR 1231 GAD, Inserm, Université de Bourgogne Franche Comté, Dijon, France
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Brun L, Borloz E, Felix MS, Louis Durand J, Villard L. Ultrasound-induced seizures in a mouse model of KCNQ2-NEO-DEE. Epilepsy Res 2023; 193:107160. [PMID: 37187037 DOI: 10.1016/j.eplepsyres.2023.107160] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2023] [Revised: 04/04/2023] [Accepted: 05/01/2023] [Indexed: 05/17/2023]
Abstract
PURPOSE KCNQ2 neonatal developmental and epileptic encephalopathy (NEO-DEE) is characterized by intractable seizures accompanied by an abnormal neurodevelopment. In a mouse model of NEO-DEE carrying the p.(Thr274Met) variant of Kcnq2, spontaneous generalized seizures occur unexpectedly preventing controlled studies and highlighting the necessity for a customized setup to trigger seizures on demand. We aimed to obtain a stable and objective read-out to control the efficacy of new antiepileptic drugs or to test seizure susceptibility. We developed a protocol to trigger ultrasound-induced seizures (UIS) on demand in this model. METHODS We tested the ability of our protocol to induce seizures at four developmental stages in the Kcnq2p.(Thr274Met/+) mouse model. We mapped the activated brain regions using c-fos protein labeling 2 h after seizure induction. RESULTS We show that the UIS have the same phenotypic expression and the same severity as spontaneous generalized seizures (SGS) in the Kcnq2-NEO-DEE mouse model. The developmental period during which mice exhibit SGS corresponds to the period during which Kcnq2p.(Thr274Met/+) mice are the most susceptible to US. C-fos labeling reveals a subset of 6 brain regions activated 2 h after the induction of the seizure. The same regions were identified in the context of seizure induction in other rodent models. CONCLUSION This study provides a non-invasive and easy to use method to induce seizures in a Kcnq2-NEO-DEE mouse model and documents early neuronal activation in specific brain regions. This method can be used to test the efficacy of new antiepileptic approaches for this intractable form of genetic epilepsy.
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Affiliation(s)
- Lucile Brun
- Aix Marseille Univ, Inserm, MMG, Marseille, France
| | | | | | | | - Laurent Villard
- Aix Marseille Univ, Inserm, MMG, Marseille, France; Service de Génétique Médicale, AP-HM, Hôpital de La Timone, Marseille, France.
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Mignon-Ravix C, Riccardi F, Daquin G, Cacciagli P, Lamoureux-Toth S, Villard L, Villeneuve N, Molinari F. NAPB and developmental and epileptic encephalopathy: description of the electro-clinical profile associated to a novel pathogenic variant. Epilepsia 2023. [PMID: 37014259 DOI: 10.1111/epi.17603] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2022] [Revised: 03/30/2023] [Accepted: 03/31/2023] [Indexed: 04/05/2023]
Abstract
Developmental and epileptic encephalopathies (DEE) are a group of neurodevelopmental disorders characterized by epileptic seizures associated with developmental delay or regression. DEE are genetically heterogeneous and the proteins involved play role in multiple pathways such as synaptic transmission, metabolism, neuronal development or maturation, transcriptional regulation or intracellular trafficking. We performed whole exome sequencing in a consanguineous family with 3 children presenting an early-onset (< 6 months) with cluster of seizures characterized by oculomotor and vegetative manifestations, with an occipital origin. Before one year of age, interictal electroencephalographic recordings were well organized and neurodevelopment was unremarkable. Then, a severe regression occurred. We identified a novel homozygous protein-truncating variant in the NAPB (NSF attachment protein beta) gene that encodes the βSNAP protein, a key regulator of the NSF (N-ethylmaleimide-sensitive fusion) ATPase. This enzyme is essential for synaptic transmission by disassembling and recycling proteins of the SNARE complex. Here, we describe the electro-clinical profile of each patient during the disease course. Our findings strengthen the association between bi-allelic variants in NAPB and DEE and refine the associated phenotype. We suggest to include this gene in the targeted epilepsy gene panels used for routine diagnosis of unexplained epilepsy.
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Affiliation(s)
| | - Florence Riccardi
- Aix-Marseille Univ, INSERM, MMG, Marseille, France
- CHITS, Hôpital Ste Musse, Département de Génétique Médicale, Toulon, France
| | - Géraldine Daquin
- AP- HM, Hôpital Timone Enfants, Service de Neurophysiologie Clinique, Marseille, France
| | - Pierre Cacciagli
- Biological Ressources Center, Assistance Publique des Hôpitaux de Marseille, Marseille, France
| | | | - Laurent Villard
- Aix-Marseille Univ, INSERM, MMG, Marseille, France
- AP- HM, Hôpital Timone Enfants, Service de Génétique Médicale, Marseille, France
| | - Nathalie Villeneuve
- AP- HM, Hôpital Timone Enfants, Service de Neurologie Pédiatrique, Marseille, France
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6
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Brock S, Laquerriere A, Marguet F, Myers SJ, Hongjie Y, Baralle D, Vanderhasselt T, Stouffs K, Keymolen K, Kim S, Allen J, Shaulsky G, Chelly J, Marcorelle P, Aziza J, Villard L, Sacaze E, de Wit MCY, Wilke M, Mancini GMS, Hehr U, Lim D, Mansour S, Traynelis SF, Beneteau C, Denis-Musquer M, Jansen AC, Fry AE, Bahi-Buisson N. Overlapping cortical malformations in patients with pathogenic variants in GRIN1 and GRIN2B. J Med Genet 2023; 60:183-192. [PMID: 35393335 PMCID: PMC10642159 DOI: 10.1136/jmedgenet-2021-107971] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2021] [Accepted: 03/16/2022] [Indexed: 01/29/2023]
Abstract
BACKGROUND Malformations of cortical development (MCDs) have been reported in a subset of patients with pathogenic heterozygous variants in GRIN1 or GRIN2B, genes which encode for subunits of the N-methyl-D-aspartate receptor (NMDAR). The aim of this study was to further define the phenotypic spectrum of NMDAR-related MCDs. METHODS We report the clinical, radiological and molecular features of 7 new patients and review data on 18 previously reported individuals with NMDAR-related MCDs. Neuropathological findings for two individuals with heterozygous variants in GRIN1 are presented. We report the clinical and neuropathological features of one additional individual with homozygous pathogenic variants in GRIN1. RESULTS Heterozygous variants in GRIN1 and GRIN2B were associated with overlapping severe clinical and imaging features, including global developmental delay, epilepsy, diffuse dysgyria, dysmorphic basal ganglia and hippocampi. Neuropathological examination in two fetuses with heterozygous GRIN1 variants suggests that proliferation as well as radial and tangential neuronal migration are impaired. In addition, we show that neuronal migration is also impaired by homozygous GRIN1 variants in an individual with microcephaly with simplified gyral pattern. CONCLUSION These findings expand our understanding of the clinical and imaging features of the 'NMDARopathy' spectrum and contribute to our understanding of the likely underlying pathogenic mechanisms leading to MCD in these patients.
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Affiliation(s)
- Stefanie Brock
- Department of Pathology, Universitair Ziekenhuis Brussel, Brussels, Belgium
- Neurogenetics Research Group, Reproduction Genetics and Regenerative Medicine Research Cluster, Vrije Universiteit Brussel, Brussels, Belgium
| | - Annie Laquerriere
- Normandy Centre for Genomic and Personalized Medicine, INSERM U1245, Rouen, France
- Department of Pathology, Rouen University Hospital, Rouen, France
| | - Florent Marguet
- Normandy Centre for Genomic and Personalized Medicine, INSERM U1245, Rouen, France
- Department of Pathology, Rouen University Hospital, Rouen, France
| | - Scott J Myers
- Department of Pharmacology and Chemical Biology, Emory University School of Medicine Atlanta, Atlanta, Georgia, USA
- Center for Functional Evaluation of Rare Variants (CFERV), Emory University School of Medicine Atlanta, Atlanta, Georgia, USA
| | - Yuan Hongjie
- Department of Pharmacology and Chemical Biology, Emory University School of Medicine Atlanta, Atlanta, Georgia, USA
- Center for Functional Evaluation of Rare Variants (CFERV), Emory University School of Medicine Atlanta, Atlanta, Georgia, USA
| | - Diana Baralle
- Human Development and Health, University of Southampton, Southampton, UK
| | - Tim Vanderhasselt
- Department of Radiology, Universitair Ziekenhuis Brussel (UZ Brussel), Brussels, Belgium
| | - Katrien Stouffs
- Neurogenetics Research Group, Reproduction Genetics and Regenerative Medicine Research Cluster, Vrije Universiteit Brussel, Brussels, Belgium
- Center for Reproduction and Genetics, Universitair Ziekenhuis Brussel (UZ Brussel), Brussels, Belgium
| | - Kathelijn Keymolen
- Center for Reproduction and Genetics, Universitair Ziekenhuis Brussel (UZ Brussel), Brussels, Belgium
| | - Sukhan Kim
- Department of Pharmacology and Chemical Biology, Emory University School of Medicine Atlanta, Atlanta, Georgia, USA
- Center for Functional Evaluation of Rare Variants (CFERV), Emory University School of Medicine Atlanta, Atlanta, Georgia, USA
| | - James Allen
- Department of Pharmacology and Chemical Biology, Emory University School of Medicine Atlanta, Atlanta, Georgia, USA
- Center for Functional Evaluation of Rare Variants (CFERV), Emory University School of Medicine Atlanta, Atlanta, Georgia, USA
| | - Gil Shaulsky
- Department of Pharmacology and Chemical Biology, Emory University School of Medicine Atlanta, Atlanta, Georgia, USA
- Center for Functional Evaluation of Rare Variants (CFERV), Emory University School of Medicine Atlanta, Atlanta, Georgia, USA
| | - Jamel Chelly
- Institut de Génétique et de Biologie Moléculaire et Cellulaire, CNRS UMR 7104, INSERM U1258, Université de Strasbourg, Strasbourg, France
- Laboratoire de Diagnostic Génétique, Hôpitaux Universitaire de Strasbourg, Strasbourg, France
| | - Pascale Marcorelle
- Service d'Anatomie Pathologique, Centre Hospitalier Universitaire de Brest; Laboratoire Neurosciences de Brest, Université de Brest, Brest, France
| | - Jacqueline Aziza
- Department of Pathology, University Institute for Cancer, Toulouse, France
| | - Laurent Villard
- Inserm, Marseille Medical Genetics Center, Aix-Marseille University, Marseille, France
- Department of Medical Genetics, La Timone Children's Hospital, Marseille, France
| | - Elise Sacaze
- Department of Pediatrics, Centre Hospitalier Universitaire de Brest, Brest, France
| | - Marie C Y de Wit
- Department of Pediatric Neurology, ENCORE Expertise Center for Neurodevelopmental Disorders, Erasmus Medical Center, Rotterdam, The Netherlands
| | - Martina Wilke
- Department of Clinical Genetics, Erasmus Medical Center, Rotterdam, The Netherlands
| | | | - Ute Hehr
- Center for Human Genetics, Universitätsklinikum Regensburg, Regensburg, Germany
| | - Derek Lim
- West Midlands Regional Genetics Service and Birmingham Health Partners, Birmingham Women's and Children's Hospitals NHS Foundation Trust, University of Southampton, Southampton, UK
| | - Sahar Mansour
- SW Thames Regional Genetics Service, University of London St George's Molecular and Clinical Sciences Research Institute, London, UK
| | - Stephen F Traynelis
- Department of Pharmacology and Chemical Biology, Emory University School of Medicine Atlanta, Atlanta, Georgia, USA
- Center for Functional Evaluation of Rare Variants (CFERV), Emory University School of Medicine Atlanta, Atlanta, Georgia, USA
| | - Claire Beneteau
- Département de Génétique, Hôpital Universitaire de Nantes, Nantes, France
- UF de Fœtopathologie et Génétique, CHU Nantes, Nantes, France
| | - Marie Denis-Musquer
- UF de Fœtopathologie et Génétique, CHU Nantes, Nantes, France
- Department of Pathology, CHU Nantes, Nantes, France
| | - Anna C Jansen
- Pediatric Neurology Unit, Universitair Ziekenhuis Antwerpen, Antwerp, Belgium
| | - Andrew E Fry
- Institute of Medical Genetics, University Hospital of Wales, Cardiff, UK
- Division of Cancer and Genetics, School of Medicine, Cardiff University, Cardiff, UK
| | - Nadia Bahi-Buisson
- Pediatric Neurology, Necker Enfants Malades Hospital, Université de Paris, Paris, France
- Embryology and Genetics of Congenital Malformations, Institut Imagine (INSERM UMR-1163), Paris, France
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7
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Parenti I, Leitão E, Kuechler A, Villard L, Goizet C, Courdier C, Bayat A, Rossi A, Julia S, Bruel AL, Tran Mau-Them F, Nambot S, Lehalle D, Willems M, Lespinasse J, Ghoumid J, Caumes R, Smol T, El Chehadeh S, Schaefer E, Abi-Warde MT, Keren B, Afenjar A, Tabet AC, Levy J, Maruani A, Aledo-Serrano Á, Garming W, Milleret-Pignot C, Chassevent A, Koopmans M, Verbeek NE, Person R, Belles R, Bellus G, Salbert BA, Kaiser FJ, Mazzola L, Convers P, Perrin L, Piton A, Wiegand G, Accogli A, Brancati F, Benfenati F, Chatron N, Lewis-Smith D, Thomas RH, Zara F, Striano P, Lesca G, Depienne C. The different clinical facets of SYN1-related neurodevelopmental disorders. Front Cell Dev Biol 2022; 10:1019715. [PMID: 36568968 PMCID: PMC9773998 DOI: 10.3389/fcell.2022.1019715] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2022] [Accepted: 10/20/2022] [Indexed: 12/13/2022] Open
Abstract
Synapsin-I (SYN1) is a presynaptic phosphoprotein crucial for synaptogenesis and synaptic plasticity. Pathogenic SYN1 variants are associated with variable X-linked neurodevelopmental disorders mainly affecting males. In this study, we expand on the clinical and molecular spectrum of the SYN1-related neurodevelopmental disorders by describing 31 novel individuals harboring 22 different SYN1 variants. We analyzed newly identified as well as previously reported individuals in order to define the frequency of key features associated with these disorders. Specifically, behavioral disturbances such as autism spectrum disorder or attention deficit hyperactivity disorder are observed in 91% of the individuals, epilepsy in 82%, intellectual disability in 77%, and developmental delay in 70%. Seizure types mainly include tonic-clonic or focal seizures with impaired awareness. The presence of reflex seizures is one of the most representative clinical manifestations related to SYN1. In more than half of the cases, seizures are triggered by contact with water, but other triggers are also frequently reported, including rubbing with a towel, fever, toothbrushing, fingernail clipping, falling asleep, and watching others showering or bathing. We additionally describe hyperpnea, emotion, lighting, using a stroboscope, digestive troubles, and defecation as possible triggers in individuals with SYN1 variants. The molecular spectrum of SYN1 variants is broad and encompasses truncating variants (frameshift, nonsense, splicing and start-loss variants) as well as non-truncating variants (missense substitutions and in-frame duplications). Genotype-phenotype correlation revealed that epileptic phenotypes are enriched in individuals with truncating variants. Furthermore, we could show for the first time that individuals with early seizures onset tend to present with severe-to-profound intellectual disability, hence highlighting the existence of an association between early seizure onset and more severe impairment of cognitive functions. Altogether, we present a detailed clinical description of the largest series of individuals with SYN1 variants reported so far and provide the first genotype-phenotype correlations for this gene. A timely molecular diagnosis and genetic counseling are cardinal for appropriate patient management and treatment.
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Affiliation(s)
- Ilaria Parenti
- Institute of Human Genetics, University Hospital Essen, University Duisburg-Essen, Essen, Germany
| | - Elsa Leitão
- Institute of Human Genetics, University Hospital Essen, University Duisburg-Essen, Essen, Germany
| | - Alma Kuechler
- Institute of Human Genetics, University Hospital Essen, University Duisburg-Essen, Essen, Germany
| | - Laurent Villard
- INSERM, MMG, Faculté de Médecine, Aix-Marseille University, Marseille, France,Département de Génétique Médicale, APHM, Hôpital d'Enfants de La Timone, Marseille, France
| | - Cyril Goizet
- Service de Génétique Médicale, Bordeaux, France,Centre de Référence Maladies Rares Neurogénétique, Service de Génétique Médicale, Bordeaux, France,NRGEN Team, INCIA, CNRS UMR 5287, University of Bordeaux, Bordeaux, France
| | - Cécile Courdier
- Service de Génétique Médicale, Bordeaux, France,Centre de Référence Maladies Rares Neurogénétique, Service de Génétique Médicale, Bordeaux, France,NRGEN Team, INCIA, CNRS UMR 5287, University of Bordeaux, Bordeaux, France
| | - Allan Bayat
- Institute for Regional Health Services, University of Southern Denmark, Odense, Denmark,Department of Epilepsy Genetics and Personalized Medicine, Danish Epilepsy Center, Dianalund, Denmark,Department of Drug Design and Pharmacology, University of Copenhagen, Copenhagen, Denmark
| | - Alessandra Rossi
- Department of Epilepsy Genetics and Personalized Medicine, Danish Epilepsy Center, Dianalund, Denmark,Pediatric Clinic, IRCCS Policlinico San Matteo Foundation, University of Pavia, Pavia, Italy
| | - Sophie Julia
- Service de Génétique Médicale, Pôle de Biologie, CHU de Toulouse - Hôpital Purpan, Toulouse, France
| | - Ange-Line Bruel
- Unité Fonctionnelle Innovation en Diagnostic Génomique des Maladies Rares, FHU-TRANSLAD, CHU Dijon Bourgogne, Dijon, France,UMR1231 GAD, Inserm - Université Bourgogne-Franche Comté, Dijon, France
| | - Frédéric Tran Mau-Them
- Unité Fonctionnelle Innovation en Diagnostic Génomique des Maladies Rares, FHU-TRANSLAD, CHU Dijon Bourgogne, Dijon, France,UMR1231 GAD, Inserm - Université Bourgogne-Franche Comté, Dijon, France
| | - Sophie Nambot
- UMR1231 GAD, Inserm - Université Bourgogne-Franche Comté, Dijon, France
| | - Daphné Lehalle
- Unité Fonctionnelle Innovation en Diagnostic Génomique des Maladies Rares, FHU-TRANSLAD, CHU Dijon Bourgogne, Dijon, France,UMR1231 GAD, Inserm - Université Bourgogne-Franche Comté, Dijon, France
| | - Marjolaine Willems
- Department of Medical Genetics, Rare diseases and Personalized Medicine, CHU Montpellier, University of Montpellier, Montpellier, France,Inserm U1298, INM, CHU Montpellier, University of Montpellier, Montpellier, France
| | - James Lespinasse
- Service de Cytogenetique, Centre Hospitalier de Chambéry, Chambéry, France
| | - Jamal Ghoumid
- Univ. Lille, ULR7364 RADEME, Lille, France,CHU Lille, Clinique de Génétique, Guy Fontaine, Lille, France
| | - Roseline Caumes
- Univ. Lille, ULR7364 RADEME, Lille, France,CHU Lille, Clinique de Génétique, Guy Fontaine, Lille, France
| | - Thomas Smol
- Univ. Lille, ULR7364 RADEME, Lille, France,CHU Lille, Institut de Génétique Médicale, Lille, France
| | - Salima El Chehadeh
- Service de Génétique Médicale, Institut de Génétique Médicale d'Alsace (IGMA), Hôpitaux Universitaires de Strasbourg, Hôpital de Hautepierre, Strasbourg, France
| | - Elise Schaefer
- Service de Génétique Médicale, Institut de Génétique Médicale d'Alsace (IGMA), Hôpitaux Universitaires de Strasbourg, Hôpital de Hautepierre, Strasbourg, France
| | | | - Boris Keren
- APHP, Département de Génétique, UF de Génomique du Développement, Département de Génétique, Groupe Hospitalier Pitié-Salpêtrière, Sorbonne Université, Paris, France
| | - Alexandra Afenjar
- Département de Génétique, Centre de Référence déficiences Intellectuelles de Causes Rares, APHP, Hôpital Armand Trousseau, Sorbonne Université, Paris, France
| | | | - Jonathan Levy
- APHP, Département de Génétique, Hôpital Robert-Debré, Paris, France
| | - Anna Maruani
- Department of Child and Adolescent Psychiatry, Robert Debré Hospital, APHP, Paris, France
| | - Ángel Aledo-Serrano
- Epilepsy and Neurogenetics Program, Neurology Department, Ruber Internacional Hospital, Madrid, Spain
| | - Waltraud Garming
- Sozialpädiatrisches Zentrum, Kinder-und Jugendklinik Gelsenkirchen, Gelsenkirchen, Germany
| | | | - Anna Chassevent
- Department of Neurogenetics, Kennedy Krieger Institute, Baltimore, MD, United States
| | - Marije Koopmans
- Department of Genetics, Utrecht University Medical Center, Utrecht, Netherlands
| | - Nienke E. Verbeek
- Department of Genetics, Utrecht University Medical Center, Utrecht, Netherlands
| | | | - Rebecca Belles
- Medical Genetics, Geisinger Medical Center, Danville, PA, United States
| | - Gary Bellus
- Medical Genetics, Geisinger Medical Center, Danville, PA, United States
| | - Bonnie A. Salbert
- Medical Genetics, Geisinger Medical Center, Danville, PA, United States
| | - Frank J. Kaiser
- Institute of Human Genetics, University Hospital Essen, University Duisburg-Essen, Essen, Germany,Essener Zentrum für Seltene Erkrankungen (EZSE), Universitätsklinikum Essen, Essen, Germany
| | - Laure Mazzola
- Department of Neurology, University Hospital, Lyon Neuroscience Research Center (CRNL), INSERM U1028, CNRS UMR5292, Lyon, France,Department of Neurology, University Hospital, Saint-Etienne, France
| | - Philippe Convers
- Department of Neurology, University Hospital, Lyon Neuroscience Research Center (CRNL), INSERM U1028, CNRS UMR5292, Lyon, France,Department of Neurology, University Hospital, Saint-Etienne, France
| | - Laurine Perrin
- Department of Paediatric Physical Medicine and Rehabilitation, CHU Saint-Étienne, Hôpital Bellevue, Rhône-Alpes Reference Centre for Neuromuscular Diseases, Saint-Étienne, France
| | - Amélie Piton
- Institut de Génétique et de Biologie Moléculaire et Cellulaire, Illkirch, France,Centre National de la Recherche Scientifique, UMR7104, Illkirch, France,Institut National de la Santé et de la Recherche Médicale, U964, Illkirch, France,Université de Strasbourg, Illkirch, France
| | - Gert Wiegand
- Division of Pediatric Neurology, Department of Pediatrics, Asklepios Klinik Nord-Heidberg, Hamburg, Germany,Department of Pediatric and Adolescent Medicine II (Neuropediatrics, Social Pediatrics), University Medical Centre Schleswig-Holstein, Kiel, Germany
| | - Andrea Accogli
- Department of Specialized Medicine, Division of Medical Genetics, McGill University Health Centre, Montreal, Qc, Canada,Department of Human Genetics, Faculty of Medicine, McGill University, Montreal, Qc, Canada
| | - Francesco Brancati
- Department of Life, Human Genetics, Health and Environmental Sciences, University of L’Aquila, L’Aquila, Italy,IRCCS San Raffaele Roma, Rome, Italy
| | - Fabio Benfenati
- Center for Synaptic Neuroscience and Technology, Istituto Italiano di Tecnologia, Geneva, Italy,IRCCS Ospedale Policlinico San Martino, Geneva, Italy
| | - Nicolas Chatron
- Service de Genetique, Hospices Civils de Lyon, Bron, France,Institute NeuroMyoGène, Laboratoire Physiopathologie et Génétique du Neurone et du Muscle, CNRS UMR 5261 -INSERM U1315, Université de Lyon - Université Claude Bernard Lyon 1, Lyon, France
| | - David Lewis-Smith
- Translational and Clinical Research Institute, Newcastle University, Newcastle Upon Tyne, United Kingdom,Department of Clinical Neurosciences, Newcastle Upon Tyne Hospitals NHS Foundation Trust, Newcastle Upon Tyne, United Kingdom
| | - Rhys H. Thomas
- Translational and Clinical Research Institute, Newcastle University, Newcastle Upon Tyne, United Kingdom,Department of Clinical Neurosciences, Newcastle Upon Tyne Hospitals NHS Foundation Trust, Newcastle Upon Tyne, United Kingdom
| | - Federico Zara
- IRCCS G. Gaslini, Genova, Italy,Department of Neurology, Rehabilitation, Ophtalmology, Genetics, Maternal and Child Health, University of Genova, Genova, Italy
| | - Pasquale Striano
- IRCCS G. Gaslini, Genova, Italy,Department of Neurology, Rehabilitation, Ophtalmology, Genetics, Maternal and Child Health, University of Genova, Genova, Italy
| | - Gaetan Lesca
- Service de Genetique, Hospices Civils de Lyon, Bron, France,Institute NeuroMyoGène, Laboratoire Physiopathologie et Génétique du Neurone et du Muscle, CNRS UMR 5261 -INSERM U1315, Université de Lyon - Université Claude Bernard Lyon 1, Lyon, France
| | - Christel Depienne
- Institute of Human Genetics, University Hospital Essen, University Duisburg-Essen, Essen, Germany,*Correspondence: Christel Depienne,
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8
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Brun L, Viemari J, Villard L. Mouse models of Kcnq2 dysfunction. Epilepsia 2022; 63:2813-2826. [PMID: 36047730 PMCID: PMC9828481 DOI: 10.1111/epi.17405] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2022] [Revised: 08/29/2022] [Accepted: 08/30/2022] [Indexed: 01/12/2023]
Abstract
Variants in the Kv7.2 channel subunit encoded by the KCNQ2 gene cause epileptic disorders ranging from a benign form with self-limited epileptic seizures and normal development to severe forms with intractable epileptic seizures and encephalopathy. The biological mechanisms involved in these neurological diseases are still unclear. The disease remains intractable in patients affected by the severe form. Over the past 20 years, KCNQ2 models have been developed to elucidate pathological mechanisms and to identify new therapeutic targets. The diversity of Kcnq2 mouse models has proven invaluable to access neuronal networks and evaluate the associated cognitive deficits. This review summarizes the available models and their contribution to our current understanding of KCNQ2 epileptic disorders.
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Affiliation(s)
- Lucile Brun
- Aix Marseille Univ, Inserm, MMGMarseilleFrance
| | | | - Laurent Villard
- Aix Marseille Univ, Inserm, MMGMarseilleFrance,Service de Génétique Médicale, AP‐HM, Hôpital de La TimoneMarseilleFrance
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9
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Maillard P, Baer S, Schaefer É, Desnous B, Villeneuve N, Lépine A, Fabre A, Lacoste C, El Chehadeh S, Piton A, Porter LF, Perriard C, Wardé MA, Spitz M, Laugel V, Lesca G, Putoux A, Ville D, Mignot C, Héron D, Nabbout R, Barcia G, Rio M, Roubertie A, Meyer P, Paquis‐Flucklinger V, Patat O, Lefranc J, Gerard M, de Bellescize J, Villard L, De Saint Martin A, Milh M. Molecular and clinical descriptions of patients with GABA A receptor gene variants (GABRA1, GABRB2, GABRB3, GABRG2): A cohort study, review of literature, and genotype-phenotype correlation. Epilepsia 2022; 63:2519-2533. [PMID: 35718920 PMCID: PMC9804453 DOI: 10.1111/epi.17336] [Citation(s) in RCA: 15] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2022] [Revised: 06/16/2022] [Accepted: 06/16/2022] [Indexed: 01/05/2023]
Abstract
OBJECTIVE γ-Aminobutyric acid (GABA)A -receptor subunit variants have recently been associated with neurodevelopmental disorders and/or epilepsy. The phenotype linked with each gene is becoming better known. Because of the common molecular structure and physiological role of these phenotypes, it seemed interesting to describe a putative phenotype associated with GABAA -receptor-related disorders as a whole and seek possible genotype-phenotype correlations. METHODS We collected clinical, electrophysiological, therapeutic, and molecular data from patients with GABAA -receptor subunit variants (GABRA1, GABRB2, GABRB3, and GABRG2) through a national French collaboration using the EPIGENE network and compared these data to the one already described in the literature. RESULTS We gathered the reported patients in three epileptic phenotypes: 15 patients with fever-related epilepsy (40%), 11 with early developmental epileptic encephalopathy (30%), 10 with generalized epilepsy spectrum (27%), and 1 patient without seizures (3%). We did not find a specific phenotype for any gene, but we showed that the location of variants on the transmembrane (TM) segment was associated with a more severe phenotype, irrespective of the GABAA -receptor subunit gene, whereas N-terminal variants seemed to be related to milder phenotypes. SIGNIFICANCE GABAA -receptor subunit variants are associated with highly variable phenotypes despite their molecular and physiological proximity. None of the genes described here was associated with a specific phenotype. On the other hand, it appears that the location of the variant on the protein may be a marker of severity. Variant location may have important weight in the development of targeted therapeutics.
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Affiliation(s)
- Pierre‐Yves Maillard
- Department of Medical GeneticsIGMA, Hôpitaux Universitaires de StrasbourgStrasbourgFrance,Present address:
Institut Jérome LejeuneParisFrance
| | - Sarah Baer
- Department of NeuropediatricsERN EpiCare, Hôpitaux Universitaires de StrasbourgStrasbourgFrance,Institute for Genetics and Molecular and Cellular Biology (IGBMC), University of Strasbourg, CNRS UMR7104, INSERM U1258IllkirchFrance
| | - Élise Schaefer
- Department of Medical GeneticsIGMA, Hôpitaux Universitaires de StrasbourgStrasbourgFrance
| | - Béatrice Desnous
- Department of Pediatric NeurologyAP‐HM, La Timone Children's HospitalMarseilleFrance
| | - Nathalie Villeneuve
- Department of Pediatric NeurologyAP‐HM, La Timone Children's HospitalMarseilleFrance
| | - Anne Lépine
- Department of Pediatric NeurologyAP‐HM, La Timone Children's HospitalMarseilleFrance
| | - Alexandre Fabre
- Pediatric Multidisciplinary UnitAP‐HM, Timone EnfantMarseilleFrance,Aix‐Marseille University, INSERM, GMGFMarseilleFrance
| | - Caroline Lacoste
- Department of Medical GeneticsLa Timone Children's HospitalMarseilleFrance
| | - Salima El Chehadeh
- Department of Medical GeneticsIGMA, Hôpitaux Universitaires de StrasbourgStrasbourgFrance,Institute for Genetics and Molecular and Cellular Biology (IGBMC), University of Strasbourg, CNRS UMR7104, INSERM U1258IllkirchFrance
| | - Amélie Piton
- Institute for Genetics and Molecular and Cellular Biology (IGBMC), University of Strasbourg, CNRS UMR7104, INSERM U1258IllkirchFrance,Laboratory of Genetic DiagnosisInstitut de Génétique Médicale d'Alsace, Hôpitaux Universitaires de StrasbourgStrasbourgFrance
| | - Louise Frances Porter
- Department of Medical GeneticsInstitut de Génétique Médicale d'Alsace, Centre de Référence pour les Affections Rares en Génétique Ophtalmologique (CARGO)StrasbourgFrance
| | - Caroline Perriard
- Department of NeuropediatricsERN EpiCare, Hôpitaux Universitaires de StrasbourgStrasbourgFrance
| | - Marie‐Thérèse Abi Wardé
- Department of NeuropediatricsERN EpiCare, Hôpitaux Universitaires de StrasbourgStrasbourgFrance
| | - Marie‐Aude Spitz
- Department of NeuropediatricsERN EpiCare, Hôpitaux Universitaires de StrasbourgStrasbourgFrance
| | - Vincent Laugel
- Department of NeuropediatricsERN EpiCare, Hôpitaux Universitaires de StrasbourgStrasbourgFrance
| | - Gaëtan Lesca
- Department of GeneticsHospices Civils de LyonBronFrance
| | - Audrey Putoux
- Department of GeneticsHospices Civils de LyonBronFrance
| | - Dorothée Ville
- Pediatric Neurology Department and Reference Center of Rare EpilepsiesMother Child Women's Hospital, Lyon University HospitalLyonFrance
| | - Cyril Mignot
- Department of GeneticsGroupe Hospitalier Pitié‐Salpêtrière and Hôpital Armand Trousseau, APHP‐Sorbonne UniversitéParisFrance,Centre de Référence Déficiences Intellectuelles de Causes RaresParisFrance
| | - Delphine Héron
- Department of GeneticsGroupe Hospitalier Pitié‐Salpêtrière and Hôpital Armand Trousseau, APHP‐Sorbonne UniversitéParisFrance,Centre de Référence Déficiences Intellectuelles de Causes RaresParisFrance
| | - Rima Nabbout
- Department of Pediatric NeurologyReference Centre for Rare Epilepsies, Necker Enfants Malades University Hospital, APHP, Université de ParisParisFrance
| | - Giulia Barcia
- Department of Medical GeneticsNecker‐Enfants Malades Hospital, Université de ParisParisFrance
| | - Marlène Rio
- Department of Medical GeneticsNecker‐Enfants Malades Hospital, Université de ParisParisFrance
| | - Agathe Roubertie
- Pediatric Neurology DepartmentINM, INSERM, CHU Montpellier, University of MontpellierMontpellierFrance
| | - Pierre Meyer
- Pediatric Neurology DepartmentINM, INSERM, CHU Montpellier, University of MontpellierMontpellierFrance
| | | | - Olivier Patat
- Department of Medical GeneticsCHU Toulouse PurpanToulouseFrance
| | | | - Marion Gerard
- Department of Medical GeneticsCentre Hospitalier Universitaire de CaenCaenFrance
| | | | - Julietta de Bellescize
- Paediatric Clinical Epileptology and Functional Neurology DepartmentReference Center of Rare Epilepsies, Member of the ERN EpiCARE, University Hospitals of Lyon (HCL)LyonFrance
| | - Laurent Villard
- Pediatric Multidisciplinary UnitAP‐HM, Timone EnfantMarseilleFrance,Faculté de Médecine TimoneAix Marseille Univ, INSERM, MMG, U1251, ERN EpicareMarseilleFrance
| | - Anne De Saint Martin
- Department of NeuropediatricsERN EpiCare, Hôpitaux Universitaires de StrasbourgStrasbourgFrance,Institute for Genetics and Molecular and Cellular Biology (IGBMC), University of Strasbourg, CNRS UMR7104, INSERM U1258IllkirchFrance
| | - Mathieu Milh
- Department of Pediatric NeurologyAP‐HM, La Timone Children's HospitalMarseilleFrance,Faculté de Médecine TimoneAix Marseille Univ, INSERM, MMG, U1251, ERN EpicareMarseilleFrance
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10
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Biba N, Becq H, Pallesi-Pocachard E, Sarno S, Granjeaud S, Montheil A, Kurz M, Villard L, Milh M, Santini PPL, Aniksztejn L. Time-limited alterations in cortical activity of a knock-in mice model of KCNQ2-related developmental and epileptic encephalopathy. J Physiol 2022; 600:2429-2460. [PMID: 35389519 DOI: 10.1113/jp282536] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2021] [Accepted: 03/10/2022] [Indexed: 11/08/2022] Open
Abstract
KEY POINTS The electrophysiological impact of the pathogenic c.821C>T mutation of the KCNQ2 gene (p.T274M variant in Kv7.2 subunit) related to Developmental and Epileptic Encephalopathy has been analyzed both in vivo and ex-vivo in layers II/III and V of motor cortical slice from a knock-in mice model during development at neonatal, post-weaning and juvenile stages. M current density and conductance are decreased and excitability of layers II/III pyramidal cells is increased in slices from neonatal and post-weaning KI mice but not from juvenile KI mice. M current and excitability of layer V pyramidal cells are impacted in KI mice only at post-weaning stage. Spontaneous GABAergic network-driven events are recorded until post-weaning stage and their frequency are increased in layers II/III of the KI mice. KI mice displayed spontaneous seizures preferentially at post-weaning rather than at juvenile stages. ABSTRACT De novo missense variants in the KCNQ2 gene encoding the Kv7.2 subunit of the voltage-gated potassium Kv7/M channels are the main cause of Developmental and Epileptic Encephalopathy (DEE) with neonatal onset. While seizures usually resolve during development, cognitive/motor deficits persist. To better understand the cellular mechanisms underlying network dysfunction and their progression over time, we investigated in vivo, using local field potential recordings of freely moving animals, and ex-vivo in layers II/III and V of motor cortical slices, using patch-clamp recordings, the electrophysiological properties of pyramidal cells from a heterozygous knock-in (KI) mouse model carrying the Kv7.2 p.T274M pathogenic variant during neonatal, post-weaning and juvenile developmental stages. We found that KI mice displayed spontaneous seizures preferentially at post-weaning rather than at juvenile stages. At the cellular level, the variant led to a reduction in M current density/conductance and to neuronal hyperexcitability. These alterations were observed during the neonatal period in pyramidal cells of layers II /III and during post-weaning stage in pyramidal cells of layer V. Moreover, there was an increase in the frequency of spontaneous network driven events mediated by GABA receptors suggesting that the excitability of interneurons was also increased. However, all these alterations were no more observed in layers II/III and V of juvenile mice. Thus, our data indicate that the action of the variant is developmentally regulated. This raises the possibility that the age related seizure remission observed in KCNQ2-related DEE patient results from a time limited alteration of Kv7 channels activity and neuronal excitability. Abstract figure legend Knock-in mice harboring the heterozygous pathogenic p.T274M variant in the Kv7.2 subunit (c.821C>T mutation of the KCNQ2 gene) related to Developmental and Epileptic Encephalopathy displayed epileptic seizures preferentially at post-weaning rather than at juvenile developmental stages. At cellular level, in motor cortical slices the variant led to a reduction in M current density, to a hyperexcitability of pyramidal cells and to an increase in the frequency of spontaneous network driven events mediated by GABA receptors. All these alterations are time limited and are observed in pyramidal cells of neonatal mice until post-weaning but not of juvenile mice in which the pyramidal cells have electrophysiological properties similar to those of wild-type mice. This article is protected by copyright. All rights reserved.
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Affiliation(s)
- Najoua Biba
- INSERM, INMED (U1249), Aix-Marseille University, Turing centre for living system, Marseille, France
| | - Hélène Becq
- INSERM, INMED (U1249), Aix-Marseille University, Turing centre for living system, Marseille, France
| | - Emilie Pallesi-Pocachard
- INSERM, INMED (U1249), Aix-Marseille University, Turing centre for living system, Marseille, France
| | - Stefania Sarno
- INSERM, INMED (U1249), Aix-Marseille University, Turing centre for living system, Marseille, France
| | - Samuel Granjeaud
- Centre de Recherche en Cancérologie de Marseille, INSERM, U1068, Institut Paoli Calmettes, CNRS, UMR7258, Aix-Marseille University UM 105, Marseille, France
| | - Aurélie Montheil
- INSERM, INMED (U1249), Aix-Marseille University, Turing centre for living system, Marseille, France
| | - Marie Kurz
- INSERM, INMED (U1249), Aix-Marseille University, Turing centre for living system, Marseille, France
| | - Laurent Villard
- Aix-Marseille University, INSERM, MMG, Marseille, France.,Department of Medical Genetics, La Timone Childrens's Hospital, Marseille, France
| | - Mathieu Milh
- Aix-Marseille University, INSERM, MMG, Marseille, France.,Department of Pediatric Neurology, La Timone Children's Hospital, Marseille, France
| | | | - Laurent Aniksztejn
- INSERM, INMED (U1249), Aix-Marseille University, Turing centre for living system, Marseille, France
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11
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Arnaud L, Abi Warde MT, Barcia G, de Bellescize J, Chatron N, Faoucher M, de Saint Martin A, Héron D, Jedraszak G, Lacoste C, Lèbre AS, Jenneson-Lyver M, Labalme A, Leguern E, Mignot C, Milh M, Nabbout R, Nava C, Panagiotakaki E, Piton A, Schaefer E, Thevenon J, Villard L, Ville D, Lesca G. The EPIGENE network: A French initiative to harmonize and improve the nationwide diagnosis of monogenic epilepsies. Eur J Med Genet 2022; 65:104445. [DOI: 10.1016/j.ejmg.2022.104445] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2021] [Revised: 01/17/2022] [Accepted: 01/22/2022] [Indexed: 11/03/2022]
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12
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Iqbal M, Maroofian R, Çavdarlı B, Riccardi F, Field M, Banka S, Bubshait DK, Li Y, Hertecant J, Baig SM, Dyment D, Efthymiou S, Abdullah U, Makhdoom EUH, Ali Z, Scherf de Almeida T, Molinari F, Mignon-Ravix C, Chabrol B, Antony J, Ades L, Pagnamenta AT, Jackson A, Douzgou S, Beetz C, Karageorgou V, Vona B, Rad A, Baig JM, Sultan T, Alvi JR, Maqbool S, Rahman F, Toosi MB, Ashrafzadeh F, Imannezhad S, Karimiani EG, Sarwar Y, Khan S, Jameel M, Noegel AA, Budde B, Altmüller J, Motameny S, Höhne W, Houlden H, Nürnberg P, Wollnik B, Villard L, Alkuraya FS, Osmond M, Hussain MS, Yigit G. Biallelic variants in PCDHGC4 cause a novel neurodevelopmental syndrome with progressive microcephaly, seizures, and joint anomalies. Genet Med 2021; 23:2138-2149. [PMID: 34244665 PMCID: PMC8553613 DOI: 10.1038/s41436-021-01260-4] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2021] [Revised: 06/14/2021] [Accepted: 06/15/2021] [Indexed: 11/08/2022] Open
Abstract
PURPOSE We aimed to define a novel autosomal recessive neurodevelopmental disorder, characterize its clinical features, and identify the underlying genetic cause for this condition. METHODS We performed a detailed clinical characterization of 19 individuals from nine unrelated, consanguineous families with a neurodevelopmental disorder. We used genome/exome sequencing approaches, linkage and cosegregation analyses to identify disease-causing variants, and we performed three-dimensional molecular in silico analysis to predict causality of variants where applicable. RESULTS In all affected individuals who presented with a neurodevelopmental syndrome with progressive microcephaly, seizures, and intellectual disability we identified biallelic disease-causing variants in Protocadherin-gamma-C4 (PCDHGC4). Five variants were predicted to induce premature protein truncation leading to a loss of PCDHGC4 function. The three detected missense variants were located in extracellular cadherin (EC) domains EC5 and EC6 of PCDHGC4, and in silico analysis of the affected residues showed that two of these substitutions were predicted to influence the Ca2+-binding affinity, which is essential for multimerization of the protein, whereas the third missense variant directly influenced the cis-dimerization interface of PCDHGC4. CONCLUSION We show that biallelic variants in PCDHGC4 are causing a novel autosomal recessive neurodevelopmental disorder and link PCDHGC4 as a member of the clustered PCDH family to a Mendelian disorder in humans.
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Affiliation(s)
- Maria Iqbal
- Cologne Center for Genomics (CCG), University of Cologne and University Hospital Cologne, Cologne, Germany
- Institute of Biochemistry I, Medical Faculty, University of Cologne, Cologne, Germany
- Human Molecular Genetics Laboratory, Health Biotechnology Division, National Institute for Biotechnology and Genetic Engineering (NIBGE) College, PIEAS, Faisalabad, Pakistan
| | - Reza Maroofian
- Department of Neuromuscular Disorders, UCL Institute of Neurology, London, UK
| | - Büşranur Çavdarlı
- Department of Medical Genetics, Ankara Bilkent City Hospital, Ankara, Turkey
| | - Florence Riccardi
- Aix Marseille Univ, INSERM, MMG, Marseille, France
- Assistance Publique-Hôpitaux de Marseille, Hôpital La Timone Enfants, Département de Génétique Médicale, Marseille, France
| | - Michael Field
- Genetics of Learning Disability Service, Hunter Genetics, Waratah, NSW, Australia
| | - Siddharth Banka
- Manchester Centre for Genomic Medicine, St Mary's Hospital, Manchester University NHS Foundation Trust, Health Innovation Manchester, Manchester, UK
- Division of Evolution and Genomic Sciences, School of Biological Sciences, Faculty of Biology, Medicine and Health, University of Manchester, Manchester, UK
| | - Dalal K Bubshait
- Department of Pediatrics, College of Medicine, Imam Abdulrahman Bin Faisal University, Dammam, Saudi Arabia
| | - Yun Li
- Institute of Human Genetics, University Medical Center Göttingen, Göttingen, Germany
| | - Jozef Hertecant
- Paediatric Genetic and Metabolic Service, Tawam Hospital, Al Ain, United Arab Emirates
| | - Shahid Mahmood Baig
- Human Molecular Genetics Laboratory, Health Biotechnology Division, National Institute for Biotechnology and Genetic Engineering (NIBGE) College, PIEAS, Faisalabad, Pakistan
- Department of Biological and Biomedical Sciences, Aga Khan University, Karachi, Pakistan
- Pakistan Science Foundation (PSF), Islamabad, Pakistan
| | - David Dyment
- Children's Hospital of Eastern Ontario Research Institute, University of Ottawa, Ottawa, Canada
| | - Stephanie Efthymiou
- Department of Neuromuscular Disorders, UCL Institute of Neurology, London, UK
| | - Uzma Abdullah
- University Institute of Biochemistry and Biotechnology (UIBB), PMAS-Arid Agriculture University, Rawalpindi, Pakistan
| | - Ehtisham Ul Haq Makhdoom
- Cologne Center for Genomics (CCG), University of Cologne and University Hospital Cologne, Cologne, Germany
- Institute of Biochemistry I, Medical Faculty, University of Cologne, Cologne, Germany
- Human Molecular Genetics Laboratory, Health Biotechnology Division, National Institute for Biotechnology and Genetic Engineering (NIBGE) College, PIEAS, Faisalabad, Pakistan
- Neurochemicalbiology and Genetics Laboratory (NGL), Department of Physiology, Faculty of Life Sciences, Government College University, Faisalabad, Pakistan
| | - Zafar Ali
- Centre for Biotechnology and Microbiology, University of Swat, Swat, Pakistan
| | | | | | | | - Brigitte Chabrol
- Assistance Publique-Hôpitaux de Marseille, APHM, Hôpital Timone Enfants, Service de Neurologie Pédiatrique, Marseille, France
| | - Jayne Antony
- T.Y. Nelson Department of Neurology and Neurosurgery, The Children's Hospital at Westmead, Sydney, Australia
| | - Lesley Ades
- Specialty of Child and Adolescent Health and Discipline of Genomic Medicine, The Children's Hospital at Westmead Clinical School, University of Sydney, Sydney, Australia
- Department of Clinical Genetics, The Children's Hospital at Westmead, Sydney, Australia
| | - Alistair T Pagnamenta
- National Institute for Health Research Oxford Biomedical Research Centre, Wellcome Centre for Human Genetics, University of Oxford, Oxford, UK
| | - Adam Jackson
- Manchester Centre for Genomic Medicine, St Mary's Hospital, Manchester University NHS Foundation Trust, Health Innovation Manchester, Manchester, UK
- Division of Evolution and Genomic Sciences, School of Biological Sciences, Faculty of Biology, Medicine and Health, University of Manchester, Manchester, UK
| | - Sofia Douzgou
- Manchester Centre for Genomic Medicine, St Mary's Hospital, Manchester University NHS Foundation Trust, Health Innovation Manchester, Manchester, UK
- Division of Evolution and Genomic Sciences, School of Biological Sciences, Faculty of Biology, Medicine and Health, University of Manchester, Manchester, UK
| | | | | | - Barbara Vona
- Department of Otolaryngology, Head and Neck Surgery, Tübingen Hearing Research Centre (THRC), Eberhard Karls University Tübingen, Tübingen, Germany
| | - Aboulfazl Rad
- Department of Otolaryngology, Head and Neck Surgery, Tübingen Hearing Research Centre (THRC), Eberhard Karls University Tübingen, Tübingen, Germany
| | - Jamshaid Mahmood Baig
- Department of Bioinformatics & Biotechnology, Faculty of Basic and Applied Sciences, International Islamic University, Islamabad, Pakistan
| | - Tipu Sultan
- Department of Pediatric Neurology, Children's Hospital and Institute of Child Health, Lahore, Pakistan
| | - Javeria Raza Alvi
- Department of Pediatric Neurology, Children's Hospital and Institute of Child Health, Lahore, Pakistan
| | - Shazia Maqbool
- Development and Behavioural Pediatrics Department, Institute of Child Health and The Children Hospital, Lahore, Pakistan
| | - Fatima Rahman
- Development and Behavioural Pediatrics Department, Institute of Child Health and The Children Hospital, Lahore, Pakistan
| | - Mehran Beiraghi Toosi
- Pediatric Neurology Department, Ghaem Hospital, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Farah Ashrafzadeh
- Pediatric Neurology Department, Ghaem Hospital, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Shima Imannezhad
- Pediatric Neurology Department, Ghaem Hospital, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Ehsan Ghayoor Karimiani
- Molecular and Clinical Sciences Institute, St. George's, University of London, Cranmer Terrace, London, UK
- Innovative Medical Research Center, Mashhad Branch, Islamic Azad University, Mashhad, Iran
| | - Yasra Sarwar
- Human Molecular Genetics Laboratory, Health Biotechnology Division, National Institute for Biotechnology and Genetic Engineering (NIBGE) College, PIEAS, Faisalabad, Pakistan
| | - Sheraz Khan
- Human Molecular Genetics Laboratory, Health Biotechnology Division, National Institute for Biotechnology and Genetic Engineering (NIBGE) College, PIEAS, Faisalabad, Pakistan
| | - Muhammad Jameel
- Human Molecular Genetics Laboratory, Health Biotechnology Division, National Institute for Biotechnology and Genetic Engineering (NIBGE) College, PIEAS, Faisalabad, Pakistan
| | - Angelika A Noegel
- Institute of Biochemistry I, Medical Faculty, University of Cologne, Cologne, Germany
- Center for Molecular Medicine Cologne (CMMC), University of Cologne, Faculty of Medicine, University Hospital Cologne, Cologne, Germany
| | - Birgit Budde
- Cologne Center for Genomics (CCG), University of Cologne and University Hospital Cologne, Cologne, Germany
| | - Janine Altmüller
- Cologne Center for Genomics (CCG), University of Cologne and University Hospital Cologne, Cologne, Germany
| | - Susanne Motameny
- Cologne Center for Genomics (CCG), University of Cologne and University Hospital Cologne, Cologne, Germany
| | - Wolfgang Höhne
- Cologne Center for Genomics (CCG), University of Cologne and University Hospital Cologne, Cologne, Germany
| | - Henry Houlden
- Department of Neuromuscular Disorders, UCL Institute of Neurology, London, UK
| | - Peter Nürnberg
- Cologne Center for Genomics (CCG), University of Cologne and University Hospital Cologne, Cologne, Germany
- Center for Molecular Medicine Cologne (CMMC), University of Cologne, Faculty of Medicine, University Hospital Cologne, Cologne, Germany
| | - Bernd Wollnik
- Institute of Human Genetics, University Medical Center Göttingen, Göttingen, Germany
- Cluster of Excellence "Multiscale Bioimaging: from Molecular Machines to Networks of Excitable Cells" (MBExC), University of Göttingen, Göttingen, Germany
| | - Laurent Villard
- Aix Marseille Univ, INSERM, MMG, Marseille, France
- Assistance Publique-Hôpitaux de Marseille, Hôpital La Timone Enfants, Département de Génétique Médicale, Marseille, France
| | - Fowzan Sami Alkuraya
- Department of Translational Genomics, Center for Genomic Medicine, King Faisal Specialist Hospital and Research Center, Riyadh, Saudi Arabia
- Department of Anatomy and Cell Biology, College of Medicine, Alfaisal University, Riyadh, Saudi Arabia
| | - Matthew Osmond
- Children's Hospital of Eastern Ontario Research Institute, University of Ottawa, Ottawa, Canada
| | - Muhammad Sajid Hussain
- Cologne Center for Genomics (CCG), University of Cologne and University Hospital Cologne, Cologne, Germany.
- Institute of Biochemistry I, Medical Faculty, University of Cologne, Cologne, Germany.
- Center for Molecular Medicine Cologne (CMMC), University of Cologne, Faculty of Medicine, University Hospital Cologne, Cologne, Germany.
| | - Gökhan Yigit
- Institute of Human Genetics, University Medical Center Göttingen, Göttingen, Germany.
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Abstract
Rett syndrome (RTT) is a severe X-linked neurodevelopmental disorder characterized by neurodevelopmental regression between 6 and 18 months of life and associated with multi-system comorbidities. Caused mainly by pathogenic variants in the MECP2 (methyl CpG binding protein 2) gene, it is the second leading genetic cause of intellectual disability in girls after Down syndrome. RTT affects not only neurological function but also a wide array of non-neurological organs. RTT-related disorders involve abnormalities of the respiratory, cardiovascular, digestive, metabolic, skeletal, endocrine, muscular, and urinary systems and immune response. Here, we review the different aspects of RTT affecting the main peripheral groups of organs and sometimes occurring independently of nervous system defects.
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Affiliation(s)
- Emilie Borloz
- Aix Marseille Univ, INSERM, MMG, U1251, Faculté de médecine Timone, 13385, Marseille, France
| | - Laurent Villard
- Aix Marseille Univ, INSERM, MMG, U1251, Faculté de médecine Timone, 13385, Marseille, France
| | - Jean-Christophe Roux
- Aix Marseille Univ, INSERM, MMG, U1251, Faculté de médecine Timone, 13385, Marseille, France
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14
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Jdila MB, Mignon-Ravix C, Ncir SB, Kammoun F, Fakhfakh F, Villard L, Triki C. A large consanguineous family with a homozygous Metabotropic Glutamate Receptor 7 (mGlu7) variant and developmental epileptic encephalopathy: Effect on protein structure and ligand affinity. Orphanet J Rare Dis 2021; 16:317. [PMID: 34273994 PMCID: PMC8286605 DOI: 10.1186/s13023-021-01951-w] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2021] [Accepted: 07/11/2021] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Developmental and epileptic encephalopathies (DEE) are chronic neurological conditions where epileptic activity contributes to the progressive disruption of brain function, frequently leading to impaired motor, cognitive and sensory development. PATIENTS AND METHODS The present study reports a clinical investigation and a molecular analysis by Next Generation Sequencing (NGS) of a large consanguineous family comprising several cases of developmental and epileptic encephalopathy. Bioinformatic prediction and molecular docking analysis were also carried out. RESULTS The majority of patients in our studied family had severe developmental impairments, early-onset seizures, brain malformations such as cortical atrophy and microcephaly, developmental delays and intellectual disabilities. The molecular investigations revealed a novel homozygous variant c.1411G>A (p.Gly471Arg) in the GRM7 gene which was segregating with the disease in the family. Bioinformatic tools predicted its pathogenicity and docking analysis revealed its potential effects on mGlu7 protein binding to its ligand. CONCLUSION Our results contribute to a better understanding of the impact of GRM7 variants for the newly described associated phenotype.
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Affiliation(s)
- Marwa Ben Jdila
- Research Laboratory 'NeuroPédiatrie' (LR19ES15), Sfax Medical School, Sfax University, Sfax, Tunisia. .,Laboratory of Molecular and Functional Genetics, Faculty of Science of Sfax, Sfax University, Sfax, Tunisia.
| | | | - Sihem Ben Ncir
- Research Laboratory 'NeuroPédiatrie' (LR19ES15), Sfax Medical School, Sfax University, Sfax, Tunisia.,Child Neurology Department, Hedi Chaker Universitary Hospital of Sfax, Sfax, Tunisia
| | - Fatma Kammoun
- Research Laboratory 'NeuroPédiatrie' (LR19ES15), Sfax Medical School, Sfax University, Sfax, Tunisia.,Child Neurology Department, Hedi Chaker Universitary Hospital of Sfax, Sfax, Tunisia
| | - Faiza Fakhfakh
- Laboratory of Molecular and Functional Genetics, Faculty of Science of Sfax, Sfax University, Sfax, Tunisia
| | - Laurent Villard
- Inserm, MMG, Aix Marseille Univ, Marseille, France.,Département de Génétique Médicale, Hôpital d'Enfants de la Timone, Assistance Publique Hôpitaux de Marseille, 13385, Marseille, France
| | - Chahnez Triki
- Research Laboratory 'NeuroPédiatrie' (LR19ES15), Sfax Medical School, Sfax University, Sfax, Tunisia.,Child Neurology Department, Hedi Chaker Universitary Hospital of Sfax, Sfax, Tunisia
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15
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Srivastava S, Macke EL, Swanson LC, Coulter D, Klee EW, Mullegama SV, Xie Y, Lanpher BC, Bedoukian EC, Skraban CM, Villard L, Milh M, Leppert MLO, Cohen JS. Expansion of the Genotypic and Phenotypic Spectrum of WASF1-Related Neurodevelopmental Disorder. Brain Sci 2021; 11:brainsci11070931. [PMID: 34356165 PMCID: PMC8307306 DOI: 10.3390/brainsci11070931] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2021] [Accepted: 07/05/2021] [Indexed: 11/18/2022] Open
Abstract
In humans, de novo truncating variants in WASF1 (Wiskott–Aldrich syndrome protein family member 1) have been linked to presentations of moderate-to-profound intellectual disability (ID), autistic features, and epilepsy. Apart from one case series, there is limited information on the phenotypic spectrum and genetic landscape of WASF1-related neurodevelopmental disorder (NDD). In this report, we describe detailed clinical characteristics of six individuals with WASF1-related NDD. We demonstrate a broader spectrum of neurodevelopmental impairment including more mildly affected individuals. Further, we report new variant types, including a copy number variant (CNV), resulting in the partial deletion of WASF1 in monozygotic twins, and three missense variants, two of which alter the same residue, p.W161. This report adds further evidence that de novo variants in WASF1 cause an autosomal dominant NDD.
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Affiliation(s)
- Siddharth Srivastava
- Department of Neurology, Boston Children’s Hospital, Harvard Medical School, Boston, MA 02115, USA; (S.S.); (L.C.S.); (D.C.)
| | - Erica L. Macke
- Center for Individualized Medicine, Mayo Clinic, Rochester, MN 55902, USA; (E.L.M.); (E.W.K.); (B.C.L.)
- Department of Quantitative Health Sciences, Mayo Clinic, Rochester, MN 55902, USA
| | - Lindsay C. Swanson
- Department of Neurology, Boston Children’s Hospital, Harvard Medical School, Boston, MA 02115, USA; (S.S.); (L.C.S.); (D.C.)
| | - David Coulter
- Department of Neurology, Boston Children’s Hospital, Harvard Medical School, Boston, MA 02115, USA; (S.S.); (L.C.S.); (D.C.)
| | - Eric W. Klee
- Center for Individualized Medicine, Mayo Clinic, Rochester, MN 55902, USA; (E.L.M.); (E.W.K.); (B.C.L.)
- Department of Quantitative Health Sciences, Mayo Clinic, Rochester, MN 55902, USA
| | | | - Yili Xie
- GeneDx Inc., Gaithersburg, MD 20877, USA; (S.V.M.); (Y.X.)
| | - Brendan C. Lanpher
- Center for Individualized Medicine, Mayo Clinic, Rochester, MN 55902, USA; (E.L.M.); (E.W.K.); (B.C.L.)
- Department of Clinical Genomics, Mayo Clinic, Rochester, MN 55902, USA
| | - Emma C. Bedoukian
- Roberts Individualized Medical Genetics Center, Children’s Hospital of Philadelphia, Philadelphia, PA 19104, USA; (E.C.B.); (C.M.S.)
- Division of Human Genetics, Children’s Hospital of Philadelphia, Philadelphia, PA 19104, USA
| | - Cara M. Skraban
- Roberts Individualized Medical Genetics Center, Children’s Hospital of Philadelphia, Philadelphia, PA 19104, USA; (E.C.B.); (C.M.S.)
- Division of Human Genetics, Children’s Hospital of Philadelphia, Philadelphia, PA 19104, USA
| | - Laurent Villard
- Department of Medical Genetics, AP-HM, La Timone Children’s Hospital, 13385 Marseille, France;
- Inserm, Marseille Medical Genetics Center, Faculté de Médecine de Marseille, Aix Marseille University, 13385 Marseille, France;
| | - Mathieu Milh
- Inserm, Marseille Medical Genetics Center, Faculté de Médecine de Marseille, Aix Marseille University, 13385 Marseille, France;
- Department of Pediatric Neurology, AP-HM, La Timone Children’s Hospital, 13385 Marseille, France
| | - Mary L. O. Leppert
- Department of Neurology and Developmental Medicine, Kennedy Krieger Institute, Baltimore, MD 21205, USA;
- Department of Pediatrics, Johns Hopkins University School of Medicine, Baltimore, MD 21287, USA
| | - Julie S. Cohen
- Department of Neurology and Developmental Medicine, Kennedy Krieger Institute, Baltimore, MD 21205, USA;
- Department of Neurology, Johns Hopkins University School of Medicine, Baltimore, MD 21287, USA
- Correspondence:
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16
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Le Roux M, Barth M, Gueden S, Desbordes de Cepoy P, Aeby A, Vilain C, Hirsch E, de Saint Martin A, Portes VD, Lesca G, Riquet A, Chaton L, Villeneuve N, Villard L, Cances C, Valton L, Renaldo F, Vermersch AI, Altuzarra C, Nguyen-Morel MA, Van Gils J, Angelini C, Biraben A, Arnaud L, Riant F, Van Bogaert P. CACNA1A-associated epilepsy: Electroclinical findings and treatment response on seizures in 18 patients. Eur J Paediatr Neurol 2021; 33:75-85. [PMID: 34102571 DOI: 10.1016/j.ejpn.2021.05.010] [Citation(s) in RCA: 23] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/18/2021] [Revised: 04/25/2021] [Accepted: 05/19/2021] [Indexed: 02/02/2023]
Abstract
CACNA1A pathogenic mutations are involved in various neurological phenotypes including episodic ataxia (EA2), spinocerebellar ataxia (SCA6), and familial hemiplegic migraine (FHM1). Epilepsy is poorly documented. We studied 18 patients (10 males) carrying de novo or inherited CACNA1A mutations, with median age of 2,5 years at epilepsy onset. Eight mutations were novel. Two variants known leading to gain of function (GOF) were found in 5 patients. Five other patients had non-sense variants leading to loss of function (LOF). Seizures were most often revealed by either status epilepticus (SE) (n = 8), eventually triggered by fever (n = 5), or absences/behavioural arrests (n = 7). Non-epileptic paroxysmal events were frequent and consisted in recurrent hemiplegic accesses (n = 9), jitteriness in the neonatal period (n = 6), and ocular paroxysmal events (n = 9). Most of the patients had early permanent cerebellar dysfunction (n = 16) and early moderate to severe global developmental delay (GDD)/intellectual deficiency (ID) (n = 17). MRI was often abnormal, with cerebellar (n = 8) and/or cerebral (n = 6) atrophy. Stroke-like occurred in 2 cases. Some antiepileptic drugs including topiramate, levetiracetam, lamotrigine and valproate were effective on seizures. Acetazolamide and calcium channel blockers were often effective when used. More than half of the patients had refractory epilepsy. CACNA1A mutation should be evoked in front of 2 main electro-clinical phenotypes that are associated with permanent cerebellar dysfunction and moderate to severe GDD/ID. The first one, found in all 5 patients with GOF variants, is characterized by intractable seizures, early and recurrent SE and hemiplegic accesses. The second, less severe, found in 5 patients with LOF variants, is characterized by refractory early onset absence seizures.
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Affiliation(s)
- Marie Le Roux
- Department of Pediatric Neurology and Neurosurgery, CHU Angers, France.
| | | | - Sophie Gueden
- Department of Pediatric Neurology and Neurosurgery, CHU Angers, France
| | | | - Alec Aeby
- Department of Pediatric Neurology, HUDERF, Bruxelles, Belgium
| | - Catheline Vilain
- Department of Medical Genetics, Erasme Hospital, Bruxelles, Belgium
| | | | | | - Vincent des Portes
- Department of Pediatric Neurology, Hospices civils de Lyon, Bron, France
| | - Gaëtan Lesca
- Department of Genetics, Hospices civils de Lyon, Bron, France
| | - Audrey Riquet
- Department of Pediatric Neurology, CHRU Lille, France
| | | | - Nathalie Villeneuve
- Department of Pediatric Neurology, Hôpital de La Timone, AP-HM, Marseille, France
| | - Laurent Villard
- Department of Medical Genetics, Hôpital de La Timone, AP-HM, Marseille, France; Aix Marseille Univ, Inserm, Marseille Medical Genetics, U1251, Marseille, France
| | - Claude Cances
- Department of Pediatric Neurology, CHU Purpan, Toulouse, France
| | - Luc Valton
- Explorations Neurophysiologiques, CHU Purpan, Toulouse, France; Centre de Recherche Cerveau et Cognition (CerCo), University of Toulouse, Toulouse F, 31300, France
| | - Florence Renaldo
- Department of Pediatric Neurology, Hôpital Trousseau, Assistance publique-Hôpitaux de Paris, France
| | - Anne-Isabelle Vermersch
- Department of Neurophysiology, Hôpital Trousseau, Assistance publique-Hôpitaux de Paris, France
| | | | | | - Julien Van Gils
- Department of Medical Genetics, CHU Bordeaux Pellegrin, Bordeaux, France
| | - Chloé Angelini
- Department of Medical Genetics, CHU Bordeaux Pellegrin, Bordeaux, France
| | - Arnaud Biraben
- Department of Neurology, CHU Rennes Pontchaillou, Rennes, France
| | - Lionel Arnaud
- Department of Genetics, Hôpital de la Pitie Salpetrière, Assistance publique-Hôpitaux de Paris, France
| | - Florence Riant
- Department of Genetics, Groupe hospitalier Saint Louis-Lariboisière, Assistance publique-Hôpitaux de Paris, France
| | - Patrick Van Bogaert
- Department of Pediatric Neurology and Neurosurgery, CHU Angers, France; Laboratoire Angevin de Recherche en Ingénierie des Systèmes (LARIS), Université d'Angers, France
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17
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Aubert Mucca M, Patat O, Whalen S, Arnaud L, Barcia G, Buratti J, Cogné B, Doummar D, Karsenty C, Kenis S, Leguern E, Lesca G, Nava C, Nizon M, Piton A, Valence S, Villard L, Weckhuysen S, Keren B, Mignot C. Patients with KCNH1-related intellectual disability without distinctive features of Zimmermann-Laband/Temple-Baraitser syndrome. J Med Genet 2021; 59:505-510. [PMID: 33811134 DOI: 10.1136/jmedgenet-2020-107511] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2020] [Revised: 03/03/2021] [Accepted: 03/12/2021] [Indexed: 01/23/2023]
Abstract
De novo missense variants in KCNH1 encoding Kv10.1 are responsible for two clinically recognisable phenotypes: Temple-Baraitser syndrome (TBS) and Zimmermann-Laband syndrome (ZLS). The clinical overlap between these two syndromes suggests that they belong to a spectrum of KCNH1-related encephalopathies. Affected patients have severe intellectual disability (ID) with or without epilepsy, hypertrichosis and distinctive features such as gingival hyperplasia and nail hypoplasia/aplasia (present in 20/23 reported cases).We report a series of seven patients with ID and de novo pathogenic KCNH1 variants identified by whole-exome sequencing or an epilepsy gene panel in whom the diagnosis of TBS/ZLS had not been first considered. Four of these variants, p.(Thr294Met), p.(Ala492Asp), p.(Thr493Asn) and p.(Gly496Arg), were located in the transmembrane domains S3 and S6 of Kv10.1 and one, p.(Arg693Gln), in its C-terminal cyclic nucleotide-binding homology domain (CNBHD). Clinical reappraisal by the referring clinical geneticists confirmed the absence of the distinctive gingival and nail features of TBS/ZLS.Our study expands the phenotypical spectrum of KCNH1-related encephalopathies to individuals with an attenuated extraneurological phenotype preventing a clinical diagnosis of TBS or ZLS. This subtype may be related to recurrent substitutions of the Gly496, suggesting a genotype-phenotype correlation and, possibly, to variants in the CNBHD domain.
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Affiliation(s)
| | - Olivier Patat
- Service de Génétique Médicale, CHU Toulouse Purpan, Toulouse, France
| | - Sandra Whalen
- Unité Fonctionnelle de Génétique Clinique, Centre de Référence Anomalies du développement et syndromes malformatifs, APHP.Sorbonne Université, Hôpital Armand Trousseau, Paris, Île-de-France, France
| | - Lionel Arnaud
- APHP.Sorbonne Université, Département de Génétique, Groupe Hospitalier Pitié Salpêtrière et Hôpital Trousseau, Paris, Île-de-France, France
| | - Giulia Barcia
- APHP, Service de Génétique Médicale, Hôpital Necker-Enfants Malades, Imagine Institute, Paris Descartes University, Paris, France
| | - Julien Buratti
- APHP.Sorbonne Université, Département de Génétique, Groupe Hospitalier Pitié Salpêtrière et Hôpital Trousseau, Paris, Île-de-France, France
| | - Benjamin Cogné
- Service de Génétique Médicale, L'institut du thorax, INSERM, CNRS, UNIV Nantes, Centre Hospitalier Universitaire de Nantes, Nantes, France
| | - Diane Doummar
- Service de Neuropédiatrie - Unité de neuropédiatrie et pathologie du développement, CHU Paris Est - Hôpital d'Enfants Armand-Trousseau, Paris, France
| | - Caroline Karsenty
- Service de Neuropédiatrie, CHU Toulouse, Hôpital des Enfants, Toulouse, France
| | - Sandra Kenis
- Child Neurology Department, University of Antwerp, University Hospital Antwerp, Edegem, Antwerp, Belgium
| | - Eric Leguern
- APHP.Sorbonne Université, Département de Génétique, Groupe Hospitalier Pitié Salpêtrière et Hôpital Trousseau, Paris, Île-de-France, France
| | - Gaetan Lesca
- EuroEPINOMICS, EuroEPINOMICS, Strasbourg, France.,Service de Génétique, LBMMS, Groupement Hospitalier Est, CHU de Lyon, Lyon, France
| | - Caroline Nava
- APHP.Sorbonne Université, Département de Génétique, Groupe Hospitalier Pitié Salpêtrière et Hôpital Trousseau, Paris, Île-de-France, France
| | - Mathilde Nizon
- Service de Génétique Médicale, L'institut du thorax, INSERM, CNRS, UNIV Nantes, Centre Hospitalier Universitaire de Nantes, Nantes, France
| | - Amelie Piton
- Laboratory of Genetic Diagnosis, Hôpitaux Universitaires de Strasbourg, Strasbourg, France
| | - Stéphanie Valence
- Service de Neuropédiatrie - Unité de neuropédiatrie et pathologie du développement, CHU Paris Est - Hôpital d'Enfants Armand-Trousseau, Paris, France
| | - Laurent Villard
- Laboratoire de génétique moléculaire, Département de Génétique Médicale, CHU de Marseille - Hôpital La Timone, Marseille, France
| | - Sarah Weckhuysen
- Applied&Translational Genomics group, VIB-Center for Molecular Neurology, University of Antwerp, Antwerp, Belgium.,Neurology Department, University Hospital Antwerp, Antwerp, Belgium
| | - Boris Keren
- APHP.Sorbonne Université, Département de Génétique, Groupe Hospitalier Pitié Salpêtrière et Hôpital Trousseau, Paris, Île-de-France, France
| | - Cyril Mignot
- APHP.Sorbonne Université, Département de Génétique, Groupe Hospitalier Pitié Salpêtrière et Hôpital Trousseau, Paris, Île-de-France, France.,INSERM, U1127, CNRS UMR 7225, Sorbonne Université, UPMC Univ Paris 06 UMR S1127, Institut du Cerveau et la Moelle épinière ICM, Paris, France.,Centre de Référence Déficiences Intellectuelles de Causes Rares, GH Pitié Salpêtrière, Paris, France
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18
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Lo Barco T, Kaminska A, Solazzi R, Cancés C, Barcia G, Chemaly N, Fontana E, Desguerre I, Canafoglia L, Hachon Le Camus C, Losito E, Villard L, Eisermann M, Dalla Bernardina B, Villeneuve N, Nabbout R. SYNGAP1-DEE: A visual sensitive epilepsy. Clin Neurophysiol 2021; 132:841-850. [PMID: 33639450 DOI: 10.1016/j.clinph.2021.01.014] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2020] [Revised: 01/05/2021] [Accepted: 01/24/2021] [Indexed: 12/01/2022]
Abstract
OBJECTIVE To further delineate the electroclinical features of individuals with SYNGAP1 pathogenic variants. METHODS Participants with pathogenic SYNGAP1 variants and available video-electroencephalogram (EEG) recordings were recruited within five European epilepsy reference centers. We obtained molecular and clinical data, analyzed EEG recordings and archived video-EEGs of seizures and detailed characteristics of interictal and ictal EEG patterns for every patient. RESULTS We recruited 15 previously unreported patients and analyzed 72 EEGs. Two distinct EEG patterns emerged, both triggered by eye closure. Pattern 1 (14/15 individuals) consisted of rhythmic posterior/diffuse delta waves appearing with eye-closure and persisting until eye opening (strongly suggestive of fixation-off sensitivity). Pattern 2 (9/15 individuals) consisted of diffuse polyspike-and-wave discharges triggered by eye closure (eye-closure sensitivity). Both patterns presented in 8/15. Including archived video-EEG clips of seizures from 9/15 patients, we analyzed 254 seizures. Of 224 seizures experienced while awake, 161 (72%) occurred at or following eye closure. In 119/161, pattern 1 preceded an atypical absence, myoclonic seizure or myoclonic absence; in 42/161, pattern 2 was associated with eyelid myoclonia, absences and myoclonic or atonic seizures. CONCLUSIONS Fixation-off and eye closure were the main triggers for seizures in this SYNGAP1 cohort. SIGNIFICANCE Combining these clinical and electroencephalographic features could help guide genetic diagnosis.
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Affiliation(s)
- Tommaso Lo Barco
- Reference Centre for Rare Epilepsies, Department of Pediatric Neurology, Necker Enfants Malades Hospital, Imagine Institute, Paris Descartes University, Paris, France; Child Neuropsychiatry, Department of Surgical Sciences, Dentistry, Gynecology and Pediatrics, University of Verona, Italy; PhD Program in Clinical and Experimental Medicine, University of Modena and Reggio Emilia, Italy.
| | - Anna Kaminska
- Department of Clinical Neurophysiology, Necker-Enfants-Malades Hospital, AP-HP, Paris, France
| | - Roberta Solazzi
- Department of Pediatric Neuroscience, Fondazione IRCCS Istituto Neurologico Carlo Besta, Milano, Italy
| | - Claude Cancés
- Department of Pediatric Neurology, Toulouse Children Hospital, Toulouse University Hospital, Toulouse, France
| | - Giulia Barcia
- Fédération de Génétique Médicale, Hôpital Necker-Enfants Malades, Paris, France
| | - Nicole Chemaly
- Reference Centre for Rare Epilepsies, Department of Pediatric Neurology, Necker Enfants Malades Hospital, Imagine Institute, Paris Descartes University, Paris, France; Department of Paediatric Neurology, Necker-Enfants Malades Hospital, University of Paris, AP-HP, Paris, France
| | - Elena Fontana
- Child Neuropsychiatry, Department of Surgical Sciences, Dentistry, Gynecology and Pediatrics, University of Verona, Italy; Research Center for Pediatric Epilepsies Verona, Verona, Italy
| | - Isabelle Desguerre
- Department of Paediatric Neurology, Necker-Enfants Malades Hospital, University of Paris, AP-HP, Paris, France
| | - Laura Canafoglia
- Neurophysiopathology, Fondazione IRCCS Istituto Neurologico Carlo Besta, Milano, Italy
| | - Caroline Hachon Le Camus
- Department of Pediatric Neurology, Toulouse Children Hospital, Toulouse University Hospital, Toulouse, France
| | - Emma Losito
- Reference Centre for Rare Epilepsies, Department of Pediatric Neurology, Necker Enfants Malades Hospital, Imagine Institute, Paris Descartes University, Paris, France
| | - Laurent Villard
- Pediatric Neurology Department, Timone Children Hospital, Reference Center for Rare Epilepsies, APHM, Marseille, France
| | - Monika Eisermann
- Department of Clinical Neurophysiology, Necker-Enfants-Malades Hospital, AP-HP, Paris, France
| | | | - Nathalie Villeneuve
- Pediatric Neurology Department, Timone Children Hospital, Reference Center for Rare Epilepsies, APHM, Marseille, France
| | - Rima Nabbout
- Reference Centre for Rare Epilepsies, Department of Pediatric Neurology, Necker Enfants Malades Hospital, Imagine Institute, Paris Descartes University, Paris, France; Department of Paediatric Neurology, Necker-Enfants Malades Hospital, University of Paris, AP-HP, Paris, France.
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19
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Matagne V, Borloz E, Ehinger Y, Saidi L, Villard L, Roux JC. Severe offtarget effects following intravenous delivery of AAV9-MECP2 in a female mouse model of Rett syndrome. Neurobiol Dis 2020; 149:105235. [PMID: 33383186 DOI: 10.1016/j.nbd.2020.105235] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2020] [Revised: 12/18/2020] [Accepted: 12/26/2020] [Indexed: 01/06/2023] Open
Abstract
Rett syndrome (RTT) is a severe X-linked neurodevelopmental disorder that is primarily caused by mutations in the methyl CpG binding protein 2 gene (MECP2). RTT is the second most prevalent genetic cause of intellectual disability in girls, and there is currently no cure for the disease. We have previously shown that gene therapy using a self-complementary AAV9 viral vector expressing a codon-optimized Mecp2 version (AAV9-MCO) significantly improved symptoms and increased survival in male Mecp2-deficient mice. Here, we pursued our studies and investigated the safety and efficacy of long-term gene therapy in the genetically relevant RTT mouse model: the heterozygous (HET) Mecp2 deficient female mouse. These mice were injected with the AAV9-MCO vector through the tail vein and an array of behavioral tests was performed. At 16- and 30-weeks post-injection, this treatment was able to rescue apneas and improved the spontaneous locomotor deficits and circadian locomotor activity in Mecp2 HET mice treated with AAV9-MCO at a dose of 5 × 1011 vg/mouse. To examine whether a higher dose of vector could result in increased improvements, we injected Mecp2 HET mice with a higher MCO vector dose (1012 vg/mouse), which resulted in some severe, sometimes lethal, side effects. In order to confirm these effects, a new cohort of Mecp2 HET mice were administered increasing doses of MCO vector (1011, 5 × 1011 and 1012 vg/mouse). Again, two weeks after vector administration, some Mecp2 HET mice were found dead while others displayed severe side effects and had to be euthanized. These deleterious effects were not observed in Mecp2 HET mice injected with a high dose of AAV9-GFP and were directly proportionate to vector dosage (0, 23 or 54% mortality at an AAV9-MCO dose of 1011, 5 × 1011, 1012 vg/mouse, respectively), and no such lethality was observed in wild-type (WT) mice. In the Mecp2 HET mice treated with the high and medium AAV9-MCO doses, blood chemistry analysis and post-mortem histology showed liver damage with drastically elevated levels of liver transaminases and disorganized liver architecture. Apoptosis was confirmed by the presence of TUNEL- and cleaved-caspase 3-positive cells in the Mecp2 HET mice treated with the higher doses of AAV9-MCO. We then studied the involvement of the unfolded protein response (UPR) in triggering apoptosis since it can be activated by AAV vectors. Increased expression of the C/EBP homologous protein (CHOP), one of UPR downstream effectors, was confirmed in Mecp2 HET mice after vector administration. The toxic reaction seen in some treated mice indicates that, although gene therapy for RTT improved breathing deficits observed in Mecp2 HET mice, further studies are needed to better understand the underlying mechanisms and caution must be exercised before similar attempts are undertaken in female Rett patients.
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Affiliation(s)
- Valerie Matagne
- Aix Marseille Univ, INSERM, MMG, U1251, Faculté de médecine Timone, 13385 Marseille, France
| | - Emilie Borloz
- Aix Marseille Univ, INSERM, MMG, U1251, Faculté de médecine Timone, 13385 Marseille, France
| | - Yann Ehinger
- Aix Marseille Univ, INSERM, MMG, U1251, Faculté de médecine Timone, 13385 Marseille, France
| | - Lydia Saidi
- Aix Marseille Univ, INSERM, MMG, U1251, Faculté de médecine Timone, 13385 Marseille, France
| | - Laurent Villard
- Aix Marseille Univ, INSERM, MMG, U1251, Faculté de médecine Timone, 13385 Marseille, France
| | - Jean-Christophe Roux
- Aix Marseille Univ, INSERM, MMG, U1251, Faculté de médecine Timone, 13385 Marseille, France.
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20
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André MV, Cacciagli P, Cano A, Vaugier L, Roussel M, Girard N, Chabrol B, Villard L, Milh M. The phenotype caused by recessive variations in SLC25A22: Report of a new case and literature review. Arch Pediatr 2020; 28:87-92. [PMID: 33342683 DOI: 10.1016/j.arcped.2020.10.015] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2018] [Revised: 07/20/2020] [Accepted: 10/31/2020] [Indexed: 10/22/2022]
Abstract
We describe the clinical, electroencephalography (EEG), and developmental features of a patient with developmental and epileptic encephalopathy due to a homozygous pathogenic variation of mitochondrial glutamate/H+ symporter SLC25A22. Epilepsy began during the first week of life with focal onset seizures. Interictal EEG revealed a suppression-burst pattern with extensive periods of non-activity. The prospective follow-up confirmed developmental encephalopathy as well as ongoing active epilepsy and almost no sign of development at 8 years of age. We confirm in the following paper that SLC25A22 recessive variations may cause a severe developmental and epileptic encephalopathy characterized by a suppression-burst pattern. On the basis of an in-depth literature review, we also provide an overview of this rare genetic cause of neonatal onset epilepsy.
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Affiliation(s)
- M-V André
- Department of pediatric neurology, hôpital de la Timone, AP-HM, 13085 Marseille, France.
| | - P Cacciagli
- Inserm, GMGF, UMR_S 910, faculté de médecine, Aix-Marseille university, 13085 Marseille, France; Department of medical genetics, hôpital de La Timone, AP-HM, 13085 Marseille, France
| | - A Cano
- Department of pediatric neurology, hôpital de la Timone, AP-HM, 13085 Marseille, France
| | - L Vaugier
- Department of clinical neurophysiology, hôpital de la Timone, AP-HM, 13085 Marseille, France
| | - M Roussel
- Department of clinical neurophysiologie, hôpital Nord, AP-HM, 13015 Marseille, France
| | - N Girard
- Department of Neuroradiology, Aix-Marseille University, AP-HM, 13085 Marseille, France
| | - B Chabrol
- Department of pediatric neurology, hôpital de la Timone, AP-HM, 13085 Marseille, France
| | - L Villard
- Inserm, GMGF, UMR_S 910, faculté de médecine, Aix-Marseille university, 13085 Marseille, France; Department of medical genetics, hôpital de La Timone, AP-HM, 13085 Marseille, France
| | - M Milh
- Department of pediatric neurology, hôpital de la Timone, AP-HM, 13085 Marseille, France; Inserm, GMGF, UMR_S 910, faculté de médecine, Aix-Marseille university, 13085 Marseille, France
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21
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Cabasson S, Van-Gils J, Villéga F, Abi-Warde MT, Barcia G, Lazaro L, Cancés C, Chelly J, Karsenty C, Rivera S, de Saint-Martin A, Trimouille A, Villard L, Pédespan JM. Early-onset epileptic encephalopathy related to germline PIGA mutations: A series of 5 cases. Eur J Paediatr Neurol 2020; 28:214-220. [PMID: 32694024 DOI: 10.1016/j.ejpn.2020.06.002] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/14/2019] [Revised: 05/25/2020] [Accepted: 06/07/2020] [Indexed: 11/26/2022]
Abstract
The molecular diagnosis of early-onset epileptic encephalopathy (EOEE), an expanding field in child neurology, is becoming increasingly possible thanks to the widespread availability of next-generation sequencing and whole-exome sequencing. In the past 15 years, mutations in STXBP1, KCNQ2, SCN2A, SCN8A and numerous other genes have been reported, giving a more accurate insight for these rare diseases. Among these genes, germline mutations in Phosphatidyl Inositol Glycan A (PIGA) gene were first reported in 2012. Located on Xp22.2, PIGA is involved in the synthesis of GPI (glycosylphosphatidylinositol) which acts as a membrane anchor for different proteins: enzymes, adhesion molecules, regulation of the complement way, and co-receptor in transduction signal. Children suffering from this condition exhibit developmental delay with early-onset epilepsy, severe dysmorphic signs, multi-visceral anomalies and early death in the most severe forms. Here, we report five cases of germline PIGA mutations, with two missense mutations that have not been reported to date. We provide a new insight into the electroclinical phenotype. At the onset, epileptic spasms and focal-onset seizures with upper limbs and ocular involvements were present. Epilepsy proved pharmacoresistant in 4 out of 5 cases. Interictal EEG may be normal at the onset of epilepsy, but abnormalities in electroencephalographic studies were eventually present in all cases. Different types of seizures may be present simultaneously, and epileptic phenotypes evolve with aging.
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Affiliation(s)
- Sébastien Cabasson
- Unité de neurologie de l'enfant et de l'adolescent. Centre Hospitalo-Universitaire de Bordeaux, Hôpital Pellegrin Enfants, Place Amélie-Raba-Léon, 33 076, Bordeaux cedex, France.
| | - Julien Van-Gils
- Service de génétique médicale. Centre Hospitalo-Universitaire de Bordeaux, Hôpital Pellegrin Enfants, Place Amélie-Raba-Léon, 33 076, Bordeaux cedex, France
| | - Frédéric Villéga
- Unité de neurologie de l'enfant et de l'adolescent. Centre Hospitalo-Universitaire de Bordeaux, Hôpital Pellegrin Enfants, Place Amélie-Raba-Léon, 33 076, Bordeaux cedex, France
| | - Marie-Thérèse Abi-Warde
- Département de neurologie pédiatrique, CHRU de Strasbourg, 1 avenue Molière, 67 000, Strasbourg, France
| | - Giulia Barcia
- Service de génétique médicale. Unité de génétique moléculaire, unité d'embryologie moléculaire. Hôpital Necker-Enfants Malades, Tour Lavoisier (3(ème) étage), 149 rue de Sèvres, 75743, Paris cedex 15, France
| | - Leila Lazaro
- Service de pédiatrie. Centre hospitalier de la côte basque, 13 avenue de l'interne Jacques-Loëb, 64 109, Bayonne, France
| | - Claude Cancés
- Service de Neuropédiatrie, Hôpital Purpan, 330 avenue de Grande-Bretagne, 31300, Toulouse, France
| | - Jamel Chelly
- Unité de génétique moléculaire, Nouvel Hôpital Civil, 1 place de l'Hôpital, BP 426, 67 091, Strasbourg cedex, France
| | - Caroline Karsenty
- Service de Neuropédiatrie, Hôpital Purpan, 330 avenue de Grande-Bretagne, 31300, Toulouse, France
| | - Serge Rivera
- Service de pédiatrie. Centre hospitalier de la côte basque, 13 avenue de l'interne Jacques-Loëb, 64 109, Bayonne, France
| | - Anne de Saint-Martin
- Département de neurologie pédiatrique, CHRU de Strasbourg, 1 avenue Molière, 67 000, Strasbourg, France
| | - Aurélien Trimouille
- Service de génétique médicale. Centre Hospitalo-Universitaire de Bordeaux, Hôpital Pellegrin Enfants, Place Amélie-Raba-Léon, 33 076, Bordeaux cedex, France
| | - Laurent Villard
- Département de génétique médicale, Laboratoire de génétique moléculaire, Assistance publique-Hôpitaux de Marseille, 264 rue Saint-Pierre, 13 385, Marseille cedex 5, France
| | - Jean-Michel Pédespan
- Unité de neurologie de l'enfant et de l'adolescent. Centre Hospitalo-Universitaire de Bordeaux, Hôpital Pellegrin Enfants, Place Amélie-Raba-Léon, 33 076, Bordeaux cedex, France
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22
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Trivisano M, Ferretti A, Bebin E, Huh L, Lesca G, Siekierska A, Takeguchi R, Carneiro M, De Palma L, Guella I, Haginoya K, Shi RM, Kikuchi A, Kobayashi T, Jung J, Lagae L, Milh M, Mathieu ML, Minassian BA, Novelli A, Pietrafusa N, Takeshita E, Tartaglia M, Terracciano A, Thompson ML, Cooper GM, Vigevano F, Villard L, Villeneuve N, Buyse GM, Demos M, Scheffer IE, Specchio N. Defining the phenotype of FHF1 developmental and epileptic encephalopathy. Epilepsia 2020; 61:e71-e78. [PMID: 32645220 DOI: 10.1111/epi.16582] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2020] [Revised: 05/18/2020] [Accepted: 05/26/2020] [Indexed: 01/25/2023]
Abstract
Fibroblast growth-factor homologous factor (FHF1) gene variants have recently been associated with developmental and epileptic encephalopathy (DEE). FHF1 encodes a cytosolic protein that modulates neuronal sodium channel gating. We aim to refine the electroclinical phenotypic spectrum of patients with pathogenic FHF1 variants. We retrospectively collected clinical, genetic, neurophysiologic, and neuroimaging data of 17 patients with FHF1-DEE. Sixteen patients had recurrent heterozygous FHF1 missense variants: 14 had the recurrent p.Arg114His variant and two had a novel likely pathogenic variant p.Gly112Ser. The p.Arg114His variant is associated with an earlier onset and more severe phenotype. One patient carried a chromosomal microduplication involving FHF1. Twelve patients carried a de novo variant, five (29.5%) inherited from parents with gonadic or somatic mosaicism. Seizure onset was between 1 day and 41 months; in 76.5% it was within 30 days. Tonic seizures were the most frequent seizure type. Twelve patients (70.6%) had drug-resistant epilepsy, 14 (82.3%) intellectual disability, and 11 (64.7%) behavioral disturbances. Brain magnetic resonance imaging (MRI) showed mild cerebral and/or cerebellar atrophy in nine patients (52.9%). Overall, our findings expand and refine the clinical, EEG, and imaging phenotype of patients with FHF1-DEE, which is characterized by early onset epilepsy with tonic seizures, associated with moderate to severe ID and psychiatric features.
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Affiliation(s)
- Marina Trivisano
- Rare and Complex Epilepsy Unit, Department of Neuroscience, Bambino Gesù Children's Hospital IRCCS, Member of European Reference Network EpiCARE, Rome, Italy
| | - Alessandro Ferretti
- Rare and Complex Epilepsy Unit, Department of Neuroscience, Bambino Gesù Children's Hospital IRCCS, Member of European Reference Network EpiCARE, Rome, Italy
| | - Elizabeth Bebin
- Department of Pediatric Neurology, University of Alabama at Birmingham, Birmingham, AL, USA
| | - Linda Huh
- Division of Neurology, Department of Pediatrics, University of British Columbia and BC Children's Hospital, Vancouver, BC, Canada
| | - Gaetan Lesca
- Service de Génétique, Hospices Civils de Lyon, Lyon, France.,Institut Neuromyogène, Equipe Métabolisme énergétique et développement neuronal, CNRS, UMR 5310, INSERM U1217, Université Lyon 1, Lyon, France
| | | | - Ryo Takeguchi
- Department of Pediatrics, Asahikawa Medical University, Asahikawa, Japan
| | - Maryline Carneiro
- Department of Pediatric Neurology, Femme Mère Enfant Hospital, Hospices Civils de Lyon, Lyon, France
| | - Luca De Palma
- Rare and Complex Epilepsy Unit, Department of Neuroscience, Bambino Gesù Children's Hospital IRCCS, Member of European Reference Network EpiCARE, Rome, Italy
| | - Ilaria Guella
- Division of Neurology, Department of Pediatrics, University of British Columbia and BC Children's Hospital, Vancouver, BC, Canada
| | - Kazuhiro Haginoya
- Department of Pediatric Neurology, Miyagi Children's Hospital, Sendai, Japan
| | - Ruo Ming Shi
- Department of Pediatrics, Tohoku University Graduate School of Medicine, Sendai, Japan.,Department of Pediatrics, First Affiliated Hospital of Xi'an Jiaotong University, Xi'an, China
| | - Atsuo Kikuchi
- Department of Pediatrics, Tohoku University Hospital, Sendai, Japan
| | - Tomoko Kobayashi
- Division of Child Development, Department of Preventive Medicine and Epidemiology, Tohoku Medical Megabank Organization, Tohoku University, Sendai, Japan
| | - Julien Jung
- Service de Génétique, Hospices Civils de Lyon, Lyon, France.,Institut Neuromyogène, Equipe Métabolisme énergétique et développement neuronal, CNRS, UMR 5310, INSERM U1217, Université Lyon 1, Lyon, France
| | - Lieven Lagae
- Department of Development and Regeneration, University Hospitals KU Leuven, Leuven, Belgium
| | - Mathieu Milh
- Department of Pediatric Neurology, Femme Mère Enfant Hospital, Hospices Civils de Lyon, Lyon, France
| | - Marie L Mathieu
- Department of Pediatric Neurology, Femme Mère Enfant Hospital, Hospices Civils de Lyon, Lyon, France
| | - Berge A Minassian
- Department of Pediatrics, University of Texas Southwestern, Dallas, TX, USA
| | - Antonio Novelli
- Genetics and Rare Diseases Research Division, Bambino Gesù Children's Hospital IRCCS, Rome, Italy
| | - Nicola Pietrafusa
- Rare and Complex Epilepsy Unit, Department of Neuroscience, Bambino Gesù Children's Hospital IRCCS, Member of European Reference Network EpiCARE, Rome, Italy
| | - Eri Takeshita
- Department of Child Neurology, National Center Hospital, National Center of Neurology and Psychiatry, Tokyo, Japan
| | - Marco Tartaglia
- Genetics and Rare Diseases Research Division, Bambino Gesù Children's Hospital IRCCS, Rome, Italy
| | - Alessandra Terracciano
- Genetics and Rare Diseases Research Division, Bambino Gesù Children's Hospital IRCCS, Rome, Italy
| | | | | | - Federico Vigevano
- Department of Neuroscience, Bambino Gesù Children's Hospital IRCCS, Member of European Reference Network EpiCARE, Rome, Italy
| | | | - Nathalie Villeneuve
- Department of Pediatric Neurology, APHM, Hopital de la Timone, Marseille, France
| | - Gunnar M Buyse
- Pediatric Neurology, University Hospitals Leuven, Leuven, Belgium
| | - Michelle Demos
- Division of Neurology, Department of Pediatrics, University of British Columbia and BC Children's Hospital, Vancouver, BC, Canada
| | - Ingrid E Scheffer
- Austin Health, and Royal Children's Hospital, Florey and Murdoch Institutes, University of Melbourne, Melbourne, Australia
| | - Nicola Specchio
- Rare and Complex Epilepsy Unit, Department of Neuroscience, Bambino Gesù Children's Hospital IRCCS, Member of European Reference Network EpiCARE, Rome, Italy
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23
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Milh M, Roubertoux P, Biba N, Chavany J, Spiga Ghata A, Fulachier C, Collins SC, Wagner C, Roux JC, Yalcin B, Félix MS, Molinari F, Lenck-Santini PP, Villard L. A knock-in mouse model for KCNQ2-related epileptic encephalopathy displays spontaneous generalized seizures and cognitive impairment. Epilepsia 2020; 61:868-878. [PMID: 32239694 PMCID: PMC7317210 DOI: 10.1111/epi.16494] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2019] [Revised: 03/09/2020] [Accepted: 03/09/2020] [Indexed: 01/06/2023]
Abstract
Objective Early onset epileptic encephalopathy with suppression‐burst is one of the most severe epilepsy phenotypes in human patients. A significant proportion of cases have a genetic origin, and the most frequently mutated gene is KCNQ2, encoding Kv7.2, a voltage‐dependent potassium channel subunit, leading to so‐called KCNQ2‐related epileptic encephalopathy (KCNQ2‐REE). To study the pathophysiology of KCNQ2‐REE in detail and to provide a relevant preclinical model, we generated and described a knock‐in mouse model carrying the recurrent p.(Thr274Met) variant. Methods We introduced the p.(Thr274Met) variant by homologous recombination in embryonic stem cells, injected into C57Bl/6N blastocysts and implanted in pseudopregnant mice. Mice were then bred with 129Sv Cre‐deleter to generate heterozygous mice carrying the p.(Thr274Met), and animals were maintained on the 129Sv genetic background. We studied the development of this new model and performed in vivo electroencephalographic (EEG) recordings, neuroanatomical studies at different time points, and multiple behavioral tests. Results The Kcnq2Thr274Met/+ mice are viable and display generalized spontaneous seizures first observed between postnatal day 20 (P20) and P30. In vivo EEG recordings show that the paroxysmal events observed macroscopically are epileptic seizures. The brain of the Kcnq2Thr274Met/+ animals does not display major structural defects, similar to humans, and their body weight is normal. Kcnq2Thr274Met/+ mice have a reduced life span, with a peak of unexpected death occurring for 25% of the animals by 3 months of age. Epileptic seizures were generally not observed when animals grew older. Behavioral characterization reveals important deficits in spatial learning and memory in adults but no gross abnormality during early neurosensory development. Significance Taken together, our results indicate that we have generated a relevant model to study the pathophysiology of KCNQ2‐related epileptic encephalopathy and perform preclinical research for that devastating and currently intractable disease.
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Affiliation(s)
- Mathieu Milh
- Aix Marseille Univ, Inserm, MMG, Marseille, France.,Department of Pediatric Neurology, La Timone Children's Hospital, Marseille, France
| | | | - Najoua Biba
- Aix-Marseille University, Inmed, Inserm, U1249, Marseille, France
| | - Julie Chavany
- Aix Marseille Univ, Inserm, MMG, Marseille, France.,Department of Pediatric Neurology, La Timone Children's Hospital, Marseille, France
| | | | | | | | | | | | | | | | - Florence Molinari
- Aix Marseille Univ, Inserm, MMG, Marseille, France.,Aix-Marseille University, Inmed, Inserm, U1249, Marseille, France
| | | | - Laurent Villard
- Aix Marseille Univ, Inserm, MMG, Marseille, France.,Department of Medical Genetics, La Timone Children's Hospital, Marseille, France
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24
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Ehinger Y, Bruyère J, Panayotis N, Abada YS, Borloz E, Matagne V, Scaramuzzino C, Vitet H, Delatour B, Saidi L, Villard L, Saudou F, Roux JC. Huntingtin phosphorylation governs BDNF homeostasis and improves the phenotype of Mecp2 knockout mice. EMBO Mol Med 2020; 12:e10889. [PMID: 31913581 PMCID: PMC7005633 DOI: 10.15252/emmm.201910889] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2019] [Revised: 12/03/2019] [Accepted: 12/05/2019] [Indexed: 01/08/2023] Open
Abstract
Mutations in the X‐linked MECP2 gene are responsible for Rett syndrome (RTT), a severe neurological disorder for which there is no treatment. Several studies have linked the loss of MeCP2 function to alterations of brain‐derived neurotrophic factor (BDNF) levels, but non‐specific overexpression of BDNF only partially improves the phenotype of Mecp2‐deficient mice. We and others have previously shown that huntingtin (HTT) scaffolds molecular motor complexes, transports BDNF‐containing vesicles, and is under‐expressed in Mecp2 knockout brains. Here, we demonstrate that promoting HTT phosphorylation at Ser421, either by a phospho‐mimetic mutation or inhibition of the phosphatase calcineurin, restores endogenous BDNF axonal transport in vitro in the corticostriatal pathway, increases striatal BDNF availability and synaptic connectivity in vivo, and improves the phenotype and the survival of Mecp2 knockout mice—even though treatments were initiated only after the mice had already developed symptoms. Stimulation of endogenous cellular pathways may thus be a promising approach for the treatment of RTT patients.
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Affiliation(s)
- Yann Ehinger
- Aix Marseille Univ, INSERM, MMG, UMR_S 1251, Marseille, France
| | - Julie Bruyère
- Univ. Grenoble Alpes, Inserm, U1216, CHU Grenoble Alpes, Grenoble Institut Neurosciences, GIN, Grenoble, France
| | | | - Yah-Se Abada
- Sorbonne Université, Institut du Cerveau et de la Moelle épinière, ICM, Inserm U1127, CNRS UMR 7225, Paris, France
| | - Emilie Borloz
- Aix Marseille Univ, INSERM, MMG, UMR_S 1251, Marseille, France
| | - Valérie Matagne
- Aix Marseille Univ, INSERM, MMG, UMR_S 1251, Marseille, France
| | - Chiara Scaramuzzino
- Univ. Grenoble Alpes, Inserm, U1216, CHU Grenoble Alpes, Grenoble Institut Neurosciences, GIN, Grenoble, France
| | - Hélène Vitet
- Univ. Grenoble Alpes, Inserm, U1216, CHU Grenoble Alpes, Grenoble Institut Neurosciences, GIN, Grenoble, France
| | - Benoit Delatour
- Sorbonne Université, Institut du Cerveau et de la Moelle épinière, ICM, Inserm U1127, CNRS UMR 7225, Paris, France
| | - Lydia Saidi
- Aix Marseille Univ, INSERM, MMG, UMR_S 1251, Marseille, France
| | - Laurent Villard
- Aix Marseille Univ, INSERM, MMG, UMR_S 1251, Marseille, France
| | - Frédéric Saudou
- Univ. Grenoble Alpes, Inserm, U1216, CHU Grenoble Alpes, Grenoble Institut Neurosciences, GIN, Grenoble, France
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25
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Mignot C, McMahon AC, Bar C, Campeau PM, Davidson C, Buratti J, Nava C, Jacquemont ML, Tallot M, Milh M, Edery P, Marzin P, Barcia G, Barnerias C, Besmond C, Bienvenu T, Bruel AL, Brunga L, Ceulemans B, Coubes C, Cristancho AG, Cunningham F, Dehouck MB, Donner EJ, Duban-Bedu B, Dubourg C, Gardella E, Gauthier J, Geneviève D, Gobin-Limballe S, Goldberg EM, Hagebeuk E, Hamdan FF, Hančárová M, Hubert L, Ioos C, Ichikawa S, Janssens S, Journel H, Kaminska A, Keren B, Koopmans M, Lacoste C, Laššuthová P, Lederer D, Lehalle D, Marjanovic D, Métreau J, Michaud JL, Miller K, Minassian BA, Morales J, Moutard ML, Munnich A, Ortiz-Gonzalez XR, Pinard JM, Prchalová D, Putoux A, Quelin C, Rosen AR, Roume J, Rossignol E, Simon MEH, Smol T, Shur N, Shelihan I, Štěrbová K, Vyhnálková E, Vilain C, Soblet J, Smits G, Yang SP, van der Smagt JJ, van Hasselt PM, van Kempen M, Weckhuysen S, Helbig I, Villard L, Héron D, Koeleman B, Møller RS, Lesca G, Helbig KL, Nabbout R, Verbeek NE, Depienne C. Correction: IQSEC2-related encephalopathy in males and females: a comparative study including 37 novel patients. Genet Med 2019; 21:1897-1898. [PMID: 30279470 PMCID: PMC7608434 DOI: 10.1038/s41436-018-0327-7] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
Abstract
This Article was originally published under Nature Research's License to Publish, but has now been made available under a CC BY 4.0 license. The PDF and HTML versions of the Article have been modified accordingly.
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Affiliation(s)
- Cyril Mignot
- INSERM, U 1127, CNRS UMR 7225, Sorbonne Universites, UPMC Univ Paris 06 UMR S 1127, Institut du Cerveau et de la Moelle epiniere, ICM, Paris, France. .,APHP, Hôpital Pitie-Salpetriere, Departement de Genetique et de Cytogenetique; Centre de Reference Deficience Intellectuelle de Causes Rares, GRC UPMC «Deficience Intellectuelle et Autisme», Paris, France.
| | - Aoife C McMahon
- European Molecular Biology Laboratory, European Bioinformatics Institute, Wellcome Genome Campus, Hinxton, Cambridge, UK
| | - Claire Bar
- APHP, Reference Centre for Rare Epilepsies, Necker-Enfants Malades Hospital, Imagine Institute, Paris Descartes University, Paris, France.,INSERM U1163, Imagine Institute, Paris, France.,Paris Descartes University, Paris, France
| | - Philippe M Campeau
- Division of Medical Genetics, Department of Pediatrics, CHU Sainte-Justine and University of Montreal, Montreal, QC, Canada
| | - Claire Davidson
- European Molecular Biology Laboratory, European Bioinformatics Institute, Wellcome Genome Campus, Hinxton, Cambridge, UK
| | - Julien Buratti
- APHP, Hôpital Pitie-Salpetriere, Departement de Genetique et de Cytogenetique; Centre de Reference Deficience Intellectuelle de Causes Rares, GRC UPMC «Deficience Intellectuelle et Autisme», Paris, France
| | - Caroline Nava
- INSERM, U 1127, CNRS UMR 7225, Sorbonne Universites, UPMC Univ Paris 06 UMR S 1127, Institut du Cerveau et de la Moelle epiniere, ICM, Paris, France.,APHP, Hôpital Pitie-Salpetriere, Departement de Genetique et de Cytogenetique; Centre de Reference Deficience Intellectuelle de Causes Rares, GRC UPMC «Deficience Intellectuelle et Autisme», Paris, France
| | | | - Marilyn Tallot
- CHU La Reunion-Groupe Hospitalier Sud Reunion, La Reunion, France
| | - Mathieu Milh
- APHM, Hôpital d'Enfants de La Timone, Service de Neurologie Pediatrique, centre de reference deficiences intellectuelles de cause rare, Marseille, France.,Aix Marseille University, INSERM, MMG, UMR-S 1251, Faculte de medecine, Marseille, France
| | - Patrick Edery
- Service de Genetique, Centre de Reference Anomalies du Developpement, Hospices Civils de Lyon, Bron, France.,INSERM U1028, CNRS UMR5292, Centre de Recherche en Neurosciences de Lyon, GENDEV Team, Universite Claude Bernard Lyon 1, Bron, France.,Claude Bernard Lyon I University, Lyon, France
| | - Pauline Marzin
- APHP, Hôpital Pitie-Salpetriere, Departement de Genetique et de Cytogenetique; Centre de Reference Deficience Intellectuelle de Causes Rares, GRC UPMC «Deficience Intellectuelle et Autisme», Paris, France
| | - Giulia Barcia
- INSERM U1163, Imagine Institute, Paris, France.,Paris Descartes University, Paris, France.,APHP, Service de genetique medicale, Necker- Enfants Malades Hospital, Imagine Institute, Paris Descartes University, Paris, France
| | - Christine Barnerias
- APHP, Unite fonctionnelle de Neurologie, Necker-Enfants Malades Hospital, Imagine Institute, Paris Descartes University, Paris, France
| | - Claude Besmond
- INSERM U1163, Imagine Institute, Paris, France.,Paris Descartes University, Paris, France
| | - Thierry Bienvenu
- APHP, Laboratoire de Genetique et Biologie Moleculaires, Hôpital Cochin, HUPC, Paris, France.,Universite Paris Descartes Paris, Institut de Psychiatrie et de Neurosciences de Paris, Inserm U894, Paris, France
| | - Ange-Line Bruel
- FHU-TRANSLAD, Universite de Bourgogne/CHU Dijon, Dijon, France.,INSERM UMR 1231 GAD team, Genetics of Developmental disorders, Universite de Bourgogne-Franche Comte, Dijon, France
| | - Ledia Brunga
- Division of Neurology, Department of Paediatrics, The Hospital for Sick Children, University of Toronto, Toronto, ON, Canada
| | - Berten Ceulemans
- Department of Pediatric Neurology, University Hospital and University of Antwerp, Antwerp, Belgium
| | - Christine Coubes
- Departement de Genetique Medicale, Maladies rares et Medecine Personnalisee, CHU de Montpellier, Montpellier, France
| | - Ana G Cristancho
- Division of Neurology, Children's Hospital of Philadelphia, Philadelphia, PA, USA
| | - Fiona Cunningham
- European Molecular Biology Laboratory, European Bioinformatics Institute, Wellcome Genome Campus, Hinxton, Cambridge, UK
| | | | - Elizabeth J Donner
- Division of Neurology, Department of Paediatrics, The Hospital for Sick Children, University of Toronto, Toronto, ON, Canada
| | - Bénédicte Duban-Bedu
- Centre de Genetique Chromosomique, Hôpital St-Vincent-de-Paul, GHICL, Lille, France
| | - Christèle Dubourg
- CHU Rennes, Service de Genetique Moleculaire et Genomique, Rennes, France
| | - Elena Gardella
- Danish Epilepsy Centre Filadelfia, Dianalund, Denmark.,Institute for Regional Health Services, University of Southern Denmark, Odense, Denmark
| | - Julie Gauthier
- Division of Medical Genetics, Department of Pediatrics, CHU Sainte-Justine and University of Montreal, Montreal, QC, Canada
| | - David Geneviève
- Departement de Genetique Medicale, Maladies rares et Medecine Personnalisee, CHU de Montpellier, Montpellier, France.,INSERM, U1183, Montpellier, France
| | - Stéphanie Gobin-Limballe
- APHP, Service de genetique medicale, Necker- Enfants Malades Hospital, Imagine Institute, Paris Descartes University, Paris, France
| | - Ethan M Goldberg
- Division of Neurology, Children's Hospital of Philadelphia, Philadelphia, PA, USA
| | - Eveline Hagebeuk
- Stichting Epilepsie Instellingen Nederland, SEIN, Zwolle, The Netherlands
| | - Fadi F Hamdan
- Division of Medical Genetics, Department of Pediatrics, CHU Sainte-Justine and University of Montreal, Montreal, QC, Canada
| | - Miroslava Hančárová
- Department of Biology and Medical Genetics, Charles University 2nd Faculty of Medicine and University Hospital Motol, Prague, Czech Republic
| | - Laurence Hubert
- INSERM U1163, Imagine Institute, Paris, France.,Paris Descartes University, Paris, France
| | - Christine Ioos
- APHP, University Hospital of Paris ïle-de-France ouest, Raymond Poincare Hospital, Garches, France
| | - Shoji Ichikawa
- Department of Clinical Diagnostics, Ambry Genetics, Aliso Viejo, CA, USA
| | - Sandra Janssens
- Centre for Medical Genetics Ghent, Ghent University Hospital, C. Heymanslaan 10, Ghent, Belgium
| | - Hubert Journel
- Service de Genetique Medicale, Hôpital Chubert, Vannes, France
| | - Anna Kaminska
- APHP, Department of Clinical Neurophysiology, Necker-Enfants Malades Hospital, Paris, France
| | - Boris Keren
- APHP, Hôpital Pitie-Salpetriere, Departement de Genetique et de Cytogenetique; Centre de Reference Deficience Intellectuelle de Causes Rares, GRC UPMC «Deficience Intellectuelle et Autisme», Paris, France
| | - Marije Koopmans
- Department of Genetics, University Medical Center Utrecht, Utrecht, The Netherlands
| | - Caroline Lacoste
- Departement de Genetique Medicale, APHM, Hopital d'Enfants de La Timone, Marseille, France
| | - Petra Laššuthová
- Child Neurology Department, 2nd Faculty of Medicine, Charles University and Motol Hospital, Prague, Czech Republic
| | - Damien Lederer
- Centre de Genetique Humaine, Institut de Pathologie et de Genetique, Gosselies, Belgium
| | - Daphné Lehalle
- FHU-TRANSLAD, Universite de Bourgogne/CHU Dijon, Dijon, France.,Unite fonctionnelle de genetique clinique, Centre Hospitalier Intercommunal de Creteil, Creteil, France
| | | | - Julia Métreau
- APHP, Service de neurologie pediatrique, Hôpital Universitaire Bicetre, Le Kremlin-Bicetre, France
| | - Jacques L Michaud
- Division of Medical Genetics, Department of Pediatrics, CHU Sainte-Justine and University of Montreal, Montreal, QC, Canada
| | - Kathryn Miller
- Department of Pediatrics, Albany Medical Center, Albany, NY, USA
| | - Berge A Minassian
- Division of Neurology, Department of Paediatrics, The Hospital for Sick Children, University of Toronto, Toronto, ON, Canada
| | - Joannella Morales
- European Molecular Biology Laboratory, European Bioinformatics Institute, Wellcome Genome Campus, Hinxton, Cambridge, UK
| | - Marie-Laure Moutard
- APHP, Hôpital Trousseau, service de neuropediatrie, Paris, France.,Sorbonne Universite, GRC n°19, pathologies Congenitales du Cervelet-LeucoDystrophies, APHP, Hôpital Armand Trousseau, Paris, France
| | - Arnold Munnich
- INSERM U1163, Imagine Institute, Paris, France.,Paris Descartes University, Paris, France.,APHP, Service de genetique medicale, Necker- Enfants Malades Hospital, Imagine Institute, Paris Descartes University, Paris, France
| | | | - Jean-Marc Pinard
- Division of Neuropediatrics, CHU Raymond Poincare (APHP), Garches, France
| | - Darina Prchalová
- Department of Biology and Medical Genetics, Charles University 2nd Faculty of Medicine and University Hospital Motol, Prague, Czech Republic
| | - Audrey Putoux
- Service de Genetique, Centre de Reference Anomalies du Developpement, Hospices Civils de Lyon, Bron, France.,INSERM U1028, CNRS UMR5292, Centre de Recherche en Neurosciences de Lyon, GENDEV Team, Universite Claude Bernard Lyon 1, Bron, France.,Claude Bernard Lyon I University, Lyon, France
| | - Chloé Quelin
- Service de Genetique Medicale, CLAD Ouest CHU Hôpital Sud, Rennes, France
| | - Alyssa R Rosen
- Division of Neurology, Children's Hospital of Philadelphia, Philadelphia, PA, USA
| | - Joelle Roume
- Unite de Genetique Medicale, Centre de Reference des Maladies rares du Developpement (AnD DI Rares), CHI Poissy-St Germain en Laye, Poissy, France
| | - Elsa Rossignol
- Departments of Pediatrics and Neurosciences, CHU Sainte-Justine and University of Montreal, Montreal, Canada
| | - Marleen E H Simon
- Department of Genetics, University Medical Center Utrecht, Utrecht, The Netherlands
| | - Thomas Smol
- Institut de Genetique Medicale, CHRU Lille, Universite de Lille, Lille, France
| | - Natasha Shur
- Department of Pediatrics, Albany Medical Center, Albany, NY, USA
| | - Ivan Shelihan
- Division of Medical Genetics, Department of Pediatrics, CHU Sainte-Justine and University of Montreal, Montreal, QC, Canada
| | - Katalin Štěrbová
- Child Neurology Department, 2nd Faculty of Medicine, Charles University and Motol Hospital, Prague, Czech Republic
| | - Emílie Vyhnálková
- Department of Biology and Medical Genetics, Charles University 2nd Faculty of Medicine and University Hospital Motol, Prague, Czech Republic
| | - Catheline Vilain
- Department of Genetics, Hôpital Universitaire des Enfants Reine Fabiola, ULB Center of Human Genetics, Universite Libre de Bruxelles, Brussels, Belgium.,Department of Genetics, Hôpital Erasme, ULB Center of Human Genetics, Universite Libre de Bruxelles, Brussels, Belgium.,Interuniversity Institute of Bioinformatics in Brussels, Universite Libre de Bruxelles, Brussels, Belgium
| | - Julie Soblet
- Department of Genetics, Hôpital Universitaire des Enfants Reine Fabiola, ULB Center of Human Genetics, Universite Libre de Bruxelles, Brussels, Belgium.,Department of Genetics, Hôpital Erasme, ULB Center of Human Genetics, Universite Libre de Bruxelles, Brussels, Belgium.,Interuniversity Institute of Bioinformatics in Brussels, Universite Libre de Bruxelles, Brussels, Belgium
| | - Guillaume Smits
- Department of Genetics, Hôpital Universitaire des Enfants Reine Fabiola, ULB Center of Human Genetics, Universite Libre de Bruxelles, Brussels, Belgium.,Department of Genetics, Hôpital Erasme, ULB Center of Human Genetics, Universite Libre de Bruxelles, Brussels, Belgium.,Interuniversity Institute of Bioinformatics in Brussels, Universite Libre de Bruxelles, Brussels, Belgium
| | - Samuel P Yang
- Clinical Genomics & Predictive Medicine, Providence Medical Group, Dayton, WA, USA
| | | | - Peter M van Hasselt
- Department of Metabolic Diseases, Wilhelmina Children's Hospital, University Medical Center, Utrecht, The Netherlands
| | - Marjan van Kempen
- Department of Genetics, University Medical Center Utrecht, Utrecht, The Netherlands
| | - Sarah Weckhuysen
- Neurogenetics Group, Center of Molecular Neurology, VIB, Antwerp, Belgium.,Neurology Department, University Hospital Antwerp, Antwerp, Belgium
| | - Ingo Helbig
- Division of Neurology, Children's Hospital of Philadelphia, Philadelphia, PA, USA
| | - Laurent Villard
- Aix Marseille University, INSERM, MMG, UMR-S 1251, Faculte de medecine, Marseille, France.,Departement de Genetique Medicale, APHM, Hopital d'Enfants de La Timone, Marseille, France
| | - Delphine Héron
- APHP, Hôpital Pitie-Salpetriere, Departement de Genetique et de Cytogenetique; Centre de Reference Deficience Intellectuelle de Causes Rares, GRC UPMC «Deficience Intellectuelle et Autisme», Paris, France
| | - Bobby Koeleman
- Department of Genetics, University Medical Center Utrecht, Utrecht, The Netherlands
| | - Rikke S Møller
- CHU Rennes, Service de Genetique Moleculaire et Genomique, Rennes, France.,Danish Epilepsy Centre Filadelfia, Dianalund, Denmark
| | - Gaetan Lesca
- Service de Genetique, Centre de Reference Anomalies du Developpement, Hospices Civils de Lyon, Bron, France.,INSERM U1028, CNRS UMR5292, Centre de Recherche en Neurosciences de Lyon, GENDEV Team, Universite Claude Bernard Lyon 1, Bron, France.,Claude Bernard Lyon I University, Lyon, France
| | - Katherine L Helbig
- Division of Neurology, Children's Hospital of Philadelphia, Philadelphia, PA, USA
| | - Rima Nabbout
- APHP, Reference Centre for Rare Epilepsies, Necker-Enfants Malades Hospital, Imagine Institute, Paris Descartes University, Paris, France.,INSERM U1163, Imagine Institute, Paris, France.,Paris Descartes University, Paris, France
| | - Nienke E Verbeek
- Department of Genetics, University Medical Center Utrecht, Utrecht, The Netherlands
| | - Christel Depienne
- INSERM, U 1127, CNRS UMR 7225, Sorbonne Universites, UPMC Univ Paris 06 UMR S 1127, Institut du Cerveau et de la Moelle epiniere, ICM, Paris, France. .,IGBMC, CNRS UMR 7104/INSERM U964/Universite de Strasbourg, Illkirch, France. .,Institute of Human Genetics, University Hospital Essen, University of Duisburg-Essen, Essen, Germany.
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26
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O'Donnell-Luria AH, Pais LS, Faundes V, Wood JC, Sveden A, Luria V, Abou Jamra R, Accogli A, Amburgey K, Anderlid BM, Azzarello-Burri S, Basinger AA, Bianchini C, Bird LM, Buchert R, Carre W, Ceulemans S, Charles P, Cox H, Culliton L, Currò A, Demurger F, Dowling JJ, Duban-Bedu B, Dubourg C, Eiset SE, Escobar LF, Ferrarini A, Haack TB, Hashim M, Heide S, Helbig KL, Helbig I, Heredia R, Héron D, Isidor B, Jonasson AR, Joset P, Keren B, Kok F, Kroes HY, Lavillaureix A, Lu X, Maas SM, Maegawa GHB, Marcelis CLM, Mark PR, Masruha MR, McLaughlin HM, McWalter K, Melchinger EU, Mercimek-Andrews S, Nava C, Pendziwiat M, Person R, Ramelli GP, Ramos LLP, Rauch A, Reavey C, Renieri A, Rieß A, Sanchez-Valle A, Sattar S, Saunders C, Schwarz N, Smol T, Srour M, Steindl K, Syrbe S, Taylor JC, Telegrafi A, Thiffault I, Trauner DA, van der Linden H, van Koningsbruggen S, Villard L, Vogel I, Vogt J, Weber YG, Wentzensen IM, Widjaja E, Zak J, Baxter S, Banka S, Rodan LH. Heterozygous Variants in KMT2E Cause a Spectrum of Neurodevelopmental Disorders and Epilepsy. Am J Hum Genet 2019; 104:1210-1222. [PMID: 31079897 PMCID: PMC6556837 DOI: 10.1016/j.ajhg.2019.03.021] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2018] [Accepted: 03/21/2019] [Indexed: 01/22/2023] Open
Abstract
We delineate a KMT2E-related neurodevelopmental disorder on the basis of 38 individuals in 36 families. This study includes 31 distinct heterozygous variants in KMT2E (28 ascertained from Matchmaker Exchange and three previously reported), and four individuals with chromosome 7q22.2-22.23 microdeletions encompassing KMT2E (one previously reported). Almost all variants occurred de novo, and most were truncating. Most affected individuals with protein-truncating variants presented with mild intellectual disability. One-quarter of individuals met criteria for autism. Additional common features include macrocephaly, hypotonia, functional gastrointestinal abnormalities, and a subtle facial gestalt. Epilepsy was present in about one-fifth of individuals with truncating variants and was responsive to treatment with anti-epileptic medications in almost all. More than 70% of the individuals were male, and expressivity was variable by sex; epilepsy was more common in females and autism more common in males. The four individuals with microdeletions encompassing KMT2E generally presented similarly to those with truncating variants, but the degree of developmental delay was greater. The group of four individuals with missense variants in KMT2E presented with the most severe developmental delays. Epilepsy was present in all individuals with missense variants, often manifesting as treatment-resistant infantile epileptic encephalopathy. Microcephaly was also common in this group. Haploinsufficiency versus gain-of-function or dominant-negative effects specific to these missense variants in KMT2E might explain this divergence in phenotype, but requires independent validation. Disruptive variants in KMT2E are an under-recognized cause of neurodevelopmental abnormalities.
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Affiliation(s)
- Anne H O'Donnell-Luria
- Division of Genetics and Genomics, Boston Children's Hospital, Harvard Medical School, Boston, MA 02115, USA; Broad Center for Mendelian Genomics, Program in Medical and Population Genetics, Broad Institute of Massachusetts Institute of Technology and Harvard, Cambridge, MA 02142, USA.
| | - Lynn S Pais
- Broad Center for Mendelian Genomics, Program in Medical and Population Genetics, Broad Institute of Massachusetts Institute of Technology and Harvard, Cambridge, MA 02142, USA
| | - Víctor Faundes
- Division of Evolution & Genomic Sciences, School of Biological Sciences, Faculty of Biology, Medicine and Health, University of Manchester, Manchester M13 9PL, UK; Laboratorio de Genética y Enfermedades Metabólicas, Instituto de Nutrición y Tecnología de los Alimentos, Universidad de Chile, Santiago, Chile
| | - Jordan C Wood
- Broad Center for Mendelian Genomics, Program in Medical and Population Genetics, Broad Institute of Massachusetts Institute of Technology and Harvard, Cambridge, MA 02142, USA
| | - Abigail Sveden
- Broad Center for Mendelian Genomics, Program in Medical and Population Genetics, Broad Institute of Massachusetts Institute of Technology and Harvard, Cambridge, MA 02142, USA
| | - Victor Luria
- Department of Systems Biology, Harvard Medical School, Boston, MA 02115, USA
| | - Rami Abou Jamra
- Institute of Human Genetics, University of Leipzig Medical Center, Leipzig 04103, Germany
| | - Andrea Accogli
- Department of Pediatrics, Department of Neurology and Neurosurgery, McGill University, Montreal, QC H4A 3J1, Quebec, Canada; Dipartimento di Neuroscienze, Riabilitazione, Oftalmologia, Genetica Scienze Materno-Infantili, Università degli studi di Genova, 16126 Genova, Italy; IRCCS Istituto Giannina Gaslini, 16147 Genova, Italy
| | - Kimberly Amburgey
- Division of Neurology, Department of Pediatrics, Hospital for Sick Children, University of Toronto, Toronto M5G 1X8, ON, Canada
| | - Britt Marie Anderlid
- Department of Molecular Medicine and Surgery, Centre for Molecular Medicine, Karolinska Institutet, Stockholm 17176, Sweden; Department of Clinical Genetics, Karolinska University Hospital, Stockholm 17176, Sweden
| | - Silvia Azzarello-Burri
- Institute of Medical Genetics, University of Zurich, Schlieren-Zurich CH-8952, Switzerland; Neuroscience Center Zurich, University of Zurich and Eidgenössische Technische Hochschule, Zurich 8057, Switzerland
| | - Alice A Basinger
- Genetics, Cook Children's Physician Network, Fort Worth, TX 76104, USA
| | - Claudia Bianchini
- Pediatric Neurology, Neurogenetics, and Neurobiology Unit and Laboratories, Neuroscience Department, Meyer Children's Hospital, University of Florence, 50139 Florence, Italy
| | - Lynne M Bird
- Department of Pediatrics, University of California, San Diego, San Diego, CA 92093, USA; Division of Genetics, Rady Children's Hospital of San Diego, San Diego, CA 92123, USA
| | - Rebecca Buchert
- Institute of Medical Genetics and Applied Genomics, University of Tuebingen, Tuebingen 72076, Germany
| | - Wilfrid Carre
- Laboratoire de Génétique Moléculaire et Génomique, Centre Hospitalier Universitaire de Rennes, Rennes 35033, France
| | - Sophia Ceulemans
- Division of Genetics, Rady Children's Hospital of San Diego, San Diego, CA 92123, USA
| | - Perrine Charles
- Department of Genetics, Centre de Référence Déficiences Intellectuelles de Causes Rares, Pitié-Salpêtrière Hospital, Assistance Publique-Hôpitaux de Paris, Paris 75013, France; Groupe de Recherche Clinique Déficience Intellectuelle et Autisme, Sorbonne University, Paris 75006, France
| | - Helen Cox
- West Midlands Regional Clinical Genetics Service, Birmingham Women's and Children's Hospital, National Health Service Foundation Trust, Birmingham B15 2TG, UK; Birmingham Health Partners, Birmingham Women's and Children's Hospital, National Health Service Foundation Trust, Birmingham B15 2TG, UK
| | - Lisa Culliton
- Department of Neurology, Children's Mercy Hospital and Clinics, Kansas City, MO 64108, USA
| | - Aurora Currò
- Medical Genetics, University of Siena, 53100 Siena, Italy; Genetica Medica, Azienda Ospedaliera Universitaria Senese, 53100 Siena, Italy
| | - Florence Demurger
- Service de Génétique Clinique, Centre de Référence Maladies Rares Centre Labellisé Anomalies du Développement-Ouest, Centre Hospitalier Universitaire de Rennes, 35033 Rennes, France
| | - James J Dowling
- Division of Neurology, Department of Pediatrics, Hospital for Sick Children, University of Toronto, Toronto M5G 1X8, ON, Canada
| | - Benedicte Duban-Bedu
- Centre de Génétique Chromosomique, Groupement des Hôpitaux de l'Institut Catholique de Lille Hôpital Saint Vincent de Paul, 59020 Lille, France; Faculté de médecine de l'Université Catholoique de Lille, 59800 Lille, France
| | - Christèle Dubourg
- Laboratoire de Génétique Moléculaire et Génomique, Centre Hospitalier Universitaire de Rennes, Rennes 35033, France
| | - Saga Elise Eiset
- Department of Clinical Genetics, Aarhus University Hospital, 8200 Aarhus, Denmark
| | - Luis F Escobar
- St. Vincent's Children's Hospital, Indianapolis, IN 46260, USA
| | - Alessandra Ferrarini
- Medical Genetic Unit, Italian Hospital of Lugano, Lugano, Switzerland; Università della Svizzera Italiana, 6900 Lugano, Switzerland
| | - Tobias B Haack
- Institute of Medical Genetics and Applied Genomics, University of Tuebingen, Tuebingen 72076, Germany
| | - Mona Hashim
- Oxford National Institute for Health Research Biomedical Research Centre, Wellcome Centre for Human Genetics, University of Oxford, Oxford OX3 7BN, UK
| | - Solveig Heide
- Department of Genetics, Centre de Référence Déficiences Intellectuelles de Causes Rares, Pitié-Salpêtrière Hospital, Assistance Publique-Hôpitaux de Paris, Paris 75013, France; Groupe de Recherche Clinique Déficience Intellectuelle et Autisme, Sorbonne University, Paris 75006, France
| | - Katherine L Helbig
- Division of Neurology and Department of Biomedical and Health Informatics, Children's Hospital of Philadelphia, Philadelphia, PA 19104, USA
| | - Ingo Helbig
- Division of Neurology and Department of Biomedical and Health Informatics, Children's Hospital of Philadelphia, Philadelphia, PA 19104, USA; Department of Neurology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, 19104 USA; Department of Neuropediatrics, University Medical Center, Christian-Albrechts-University of Kiel, 24105 Kiel, Germany
| | | | - Delphine Héron
- Department of Genetics, Centre de Référence Déficiences Intellectuelles de Causes Rares, Pitié-Salpêtrière Hospital, Assistance Publique-Hôpitaux de Paris, Paris 75013, France; Groupe de Recherche Clinique Déficience Intellectuelle et Autisme, Sorbonne University, Paris 75006, France
| | - Bertrand Isidor
- Service de Génétique Médicale, Hôpital Hôtel-Dieu, Centre Hospitalier Universitaire de Nantes, 44093 Nantes, France
| | - Amy R Jonasson
- Division of Genetics and Metabolism, Department of Pediatrics, University of Florida, FL 32610, USA
| | - Pascal Joset
- Institute of Medical Genetics, University of Zurich, Schlieren-Zurich CH-8952, Switzerland; Neuroscience Center Zurich, University of Zurich and Eidgenössische Technische Hochschule, Zurich 8057, Switzerland
| | - Boris Keren
- Department of Genetics, Centre de Référence Déficiences Intellectuelles de Causes Rares, Pitié-Salpêtrière Hospital, Assistance Publique-Hôpitaux de Paris, Paris 75013, France; Groupe de Recherche Clinique Déficience Intellectuelle et Autisme, Sorbonne University, Paris 75006, France
| | - Fernando Kok
- Mendelics Genomic Analysis, Sao Paulo 04013, Brazil
| | - Hester Y Kroes
- Department of Medical Genetics, University Medical Center Utrecht, 3584 CX Utrecht, Netherlands
| | - Alinoë Lavillaureix
- Service de Génétique Clinique, Centre de Référence Maladies Rares Centre Labellisé Anomalies du Développement-Ouest, Centre Hospitalier Universitaire de Rennes, 35033 Rennes, France
| | - Xin Lu
- Ludwig Institute for Cancer Research, Nuffield Department of Clinical Medicine, University of Oxford, Oxford OX3 7DQ, UK
| | - Saskia M Maas
- Department of Clinical Genetics, Amsterdam University Medical Center, University of Amsterdam, 1105 AZ Amsterdam, the Netherlands
| | - Gustavo H B Maegawa
- Division of Genetics and Metabolism, Department of Pediatrics, University of Florida, FL 32610, USA
| | - Carlo L M Marcelis
- Department of Clinical Genetics, Radboud University Medical Centre, 6525 GA Nijmegen, the Netherlands
| | - Paul R Mark
- Division of Medical Genetics and Genomics, Spectrum Health, Grand Rapids, MI 49544, USA
| | - Marcelo R Masruha
- Department of Neurology and Neurosurgery, Universidade de Federal de São Paulo, São Paulo 04023, Brazil
| | | | | | - Esther U Melchinger
- Institute of Medical Genetics and Applied Genomics, University of Tuebingen, Tuebingen 72076, Germany
| | - Saadet Mercimek-Andrews
- Division of Clinical and Metabolic Genetics, Department of Pediatrics, University of Toronto, The Hospital for Sick Children, Toronto, ON, M5G 1X8, Canada
| | - Caroline Nava
- Department of Genetics, Centre de Référence Déficiences Intellectuelles de Causes Rares, Pitié-Salpêtrière Hospital, Assistance Publique-Hôpitaux de Paris, Paris 75013, France; Groupe de Recherche Clinique Déficience Intellectuelle et Autisme, Sorbonne University, Paris 75006, France
| | - Manuela Pendziwiat
- Department of Neuropediatrics, University Medical Center, Christian-Albrechts-University of Kiel, 24105 Kiel, Germany
| | | | - Gian Paolo Ramelli
- Neuropediatric Unit, Pediatric Department of Southern Switzerland, San Giovanni Hospital, 6500 Bellinzona, Switzerland
| | | | - Anita Rauch
- Institute of Medical Genetics, University of Zurich, Schlieren-Zurich CH-8952, Switzerland; Neuroscience Center Zurich, University of Zurich and Eidgenössische Technische Hochschule, Zurich 8057, Switzerland; Rare Disease Initiative Zürich, Clinical Research Priority Program for Rare Diseases, University of Zurich, CH-8006 Zurich, Switzerland
| | | | - Alessandra Renieri
- Medical Genetics, University of Siena, 53100 Siena, Italy; Genetica Medica, Azienda Ospedaliera Universitaria Senese, 53100 Siena, Italy
| | - Angelika Rieß
- Institute of Medical Genetics and Applied Genomics, University of Tuebingen, Tuebingen 72076, Germany
| | - Amarilis Sanchez-Valle
- Department of Pediatrics, Division of Genetics and Metabolism, University of South Florida, Tampa, FL 33606, USA
| | - Shifteh Sattar
- Section of Pediatric Neurology, Rady Children's Hospital, San Diego, CA 92123, USA; Department of Neurosciences, University of California San Diego, La Jolla, CA 92093, USA; Department of Pediatrics, University of California San Diego, La Jolla, CA 92093, USA
| | - Carol Saunders
- Center for Pediatric Genomic Medicine, Children's Mercy Hospital and Clinics, Kansas City, MO 64108, USA; School of Medicine, University of Missouri, Kansas City, MO 64108, USA
| | - Niklas Schwarz
- Department of Neurology and Epileptology, Hertie Institute for Clinical Brain Research, University of Tübingen, 72076 Tübingen, Germany
| | - Thomas Smol
- EA7364 Rares du Developpement Embryonnaire et du Metabolisme, Institut de Genetique Medicale, Centre Hospitalier Universitaire de Lille, University of Lille, F-59000 Lille, France
| | - Myriam Srour
- Department of Pediatrics, Department of Neurology and Neurosurgery, McGill University, Montreal, QC H4A 3J1, Quebec, Canada
| | - Katharina Steindl
- Institute of Medical Genetics, University of Zurich, Schlieren-Zurich CH-8952, Switzerland; Neuroscience Center Zurich, University of Zurich and Eidgenössische Technische Hochschule, Zurich 8057, Switzerland
| | - Steffen Syrbe
- Division of Child Neurology and Inherited Metabolic Diseases, Department of General Paediatrics, Centre for Paediatrics and Adolescent Medicine, University Hospital Heidelberg, 69120 Heidelberg, Germany
| | - Jenny C Taylor
- Oxford National Institute for Health Research Biomedical Research Centre, Wellcome Centre for Human Genetics, University of Oxford, Oxford OX3 7BN, UK
| | | | - Isabelle Thiffault
- School of Medicine, University of Missouri, Kansas City, MO 64108, USA; Department of Pathology and Laboratory Medicine, Children's Mercy Hospital and Clinics, Kansas City, MO 64108, USA
| | - Doris A Trauner
- Section of Pediatric Neurology, Rady Children's Hospital, San Diego, CA 92123, USA; Department of Neurosciences, University of California San Diego, La Jolla, CA 92093, USA; Department of Pediatrics, University of California San Diego, La Jolla, CA 92093, USA
| | - Helio van der Linden
- Pediatric Neurology and Neurophysiology, Instituto de Neurologia de Goiania, Goiania 74210, Brazil
| | - Silvana van Koningsbruggen
- Department of Clinical Genetics, Amsterdam University Medical Center, University of Amsterdam, 1105 AZ Amsterdam, the Netherlands
| | - Laurent Villard
- Department of Medical Genetics, Assistance Publique - Hôpitaux de Marseille, Hôpital d'Enfants de La Timone, 13005 Marseille, France; Marseille Medical Genetics Center, Aix Marseille Univ, Inserm, U1251, Marseille, France
| | - Ida Vogel
- Department of Clinical Genetics, Aarhus University Hospital, 8200 Aarhus, Denmark; Center for Fetal Diagnostics, Aarhus University Hospital, 8200 Aarhus, Denmark
| | - Julie Vogt
- West Midlands Regional Clinical Genetics Service, Birmingham Women's and Children's Hospital, National Health Service Foundation Trust, Birmingham B15 2TG, UK; Birmingham Health Partners, Birmingham Women's and Children's Hospital, National Health Service Foundation Trust, Birmingham B15 2TG, UK
| | - Yvonne G Weber
- Department of Neurology and Epileptology, Hertie Institute for Clinical Brain Research, University of Tübingen, 72076 Tübingen, Germany; Department for Neurosurgery, University of Tübingen, 72076 Tübingen, Germany
| | | | - Elysa Widjaja
- Department of Diagnostic Imaging, Hospital for Sick Children, University of Toronto, Toronto, M5G 1X8, ON, Canada
| | - Jaroslav Zak
- Ludwig Institute for Cancer Research, Nuffield Department of Clinical Medicine, University of Oxford, Oxford OX3 7DQ, UK; Department of Immunology and Microbiology, The Scripps Research Institute, La Jolla, CA 92037, USA
| | - Samantha Baxter
- Broad Center for Mendelian Genomics, Program in Medical and Population Genetics, Broad Institute of Massachusetts Institute of Technology and Harvard, Cambridge, MA 02142, USA
| | - Siddharth Banka
- Division of Evolution & Genomic Sciences, School of Biological Sciences, Faculty of Biology, Medicine and Health, University of Manchester, Manchester M13 9PL, UK; Manchester Centre for Genomic Medicine, St Mary's Hospital, Manchester University National Health Service Foundation Trust, Health Innovation Manchester, Manchester M13 9WL, UK
| | - Lance H Rodan
- Division of Genetics and Genomics, Boston Children's Hospital, Harvard Medical School, Boston, MA 02115, USA; Department of Neurology, Boston Children's Hospital, Harvard Medical School, Boston, MA 02115, USA.
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27
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Denis J, Villeneuve N, Cacciagli P, Mignon-Ravix C, Lacoste C, Lefranc J, Napuri S, Damaj L, Villega F, Pedespan JM, Moutton S, Mignot C, Doummar D, Lion-François L, Gataullina S, Dulac O, Martin M, Gueden S, Lesca G, Julia S, Cances C, Journel H, Altuzarra C, Ben Zeev B, Afenjar A, Barth M, Villard L, Milh M. Clinical study of 19 patients with SCN8A-related epilepsy: Two modes of onset regarding EEG and seizures. Epilepsia 2019; 60:845-856. [PMID: 31026061 DOI: 10.1111/epi.14727] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2018] [Revised: 03/21/2019] [Accepted: 03/21/2019] [Indexed: 01/29/2023]
Abstract
OBJECTIVE To describe the mode of onset of SCN8A-related severe epilepsy in order to facilitate early recognition, and eventually early treatment with sodium channel blockers. METHODS We reviewed the phenotype of patients carrying a mutation in the SCN8A gene, among a multicentric cohort of 638 patients prospectively followed by several pediatric neurologists. We focused on the way clinicians made the diagnosis of epileptic encephalopathy, the very first symptoms, electroencephalography (EEG) findings, and seizure types. We made genotypic/phenotypic correlation based on epilepsy-associated missense variant localization over the protein. RESULTS We found 19 patients carrying a de novo mutation of SCN8A, representing 3% of our cohort, with 9 mutations being novel. Age at onset of epilepsy was 1 day to 16 months. We found two modes of onset: 12 patients had slowly emerging onset with rare and/or subtle seizures and normal interictal EEG (group 1). The first event was either acute generalized tonic-clonic seizure (GTCS; Group 1a, n = 6) or episodes of myoclonic jerks that were often mistaken for sleep-related movements or other movement disorders (Group 1b, n = 6). Seven patients had a sudden onset of frequent tonic seizures or epileptic spasms with abnormal interictal EEG leading to rapid diagnosis of epileptic encephalopathy. Sodium channel blockers were effective or nonaggravating in most cases. SIGNIFICANCE SCN8A is the third most prevalent early onset epileptic encephalopathy gene and is associated with two modes of onset of epilepsy.
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Affiliation(s)
- Julien Denis
- Pediatric Neurology Department, Timone Children Hospital, Reference Center for Rare Epilepsies, APHM, Marseille, France
| | - Nathalie Villeneuve
- Pediatric Neurology Department, Timone Children Hospital, Reference Center for Rare Epilepsies, APHM, Marseille, France
| | - Pierre Cacciagli
- Medical Genetics Department, Timone Children Hospital, Marseille, France
| | | | - Caroline Lacoste
- Medical Genetics Department, Timone Children Hospital, Marseille, France
| | - Jeremie Lefranc
- Pediatrics and Medical Genetics Department, CHU Brest, Brest, France
| | - Sylvia Napuri
- Department of Pediatrics, Rennes University Hospital, Rennes, France
| | - Lena Damaj
- Department of Pediatrics, Rennes University Hospital, Rennes, France
| | - Frederic Villega
- Department of Pediatric Neurology, University Children's Hospital of Bordeaux, Bordeaux, France
| | - Jean-Michel Pedespan
- Department of Pediatric Neurology, University Children's Hospital of Bordeaux, Bordeaux, France
| | - Sebastien Moutton
- Medical Genetics Department, University Hospital of Bordeaux, Bordeaux, France
| | - Cyril Mignot
- Pediatric Neurology Department, Trousseau Hospital, AP-HP, Paris, France
| | - Diane Doummar
- Pediatric Neurology Department, Trousseau Hospital, AP-HP, Paris, France
| | | | - Svetlana Gataullina
- Paediatric Neurology Department, Paris-Sud University, Bicêtre Hospital, Kremlin-Bicêtre, France.,Inserm U1129, Necker Hospital, Paris, France
| | | | - Melanie Martin
- Department of Histology, Cytology, Cytogenetics and Cell Biology, University Hospital of Limoges, Limoges, France
| | - Sophie Gueden
- Pediatric Neurology Department, Angers Hospital and University, Angers, France
| | - Gaetan Lesca
- Department of Medical Genetics, Groupement Hospitalier Est, and ERN EpiCARE, University Hospitals of Lyon (HCL), Lyon, France.,Lyon Neuroscience Research Center, CNRS UMR5292, INSERM U1028, Lyon, France
| | - Sophie Julia
- Genetics Unit, Toulouse University Hospital, Toulouse, France
| | - Claude Cances
- Department of Pediatric Neurology, Toulouse Children Hospital, Toulouse University Hospital, Toulouse, France
| | - Hubert Journel
- Department of Genetics, Vannes Bretagne-Atlantique Hospital, Vannes, France
| | | | - Bruria Ben Zeev
- Chaim Sheba Medical Center, Edmond and Lily Safra Children's Hospital, Ramat Gan, Israel.,Sackler School of Medicine, Tel Aviv University, Tel Aviv, Israel
| | - Alexandra Afenjar
- Medical Genetics Department, AP-HP, University hospital Armand Trousseau, Paris, France
| | - Magalie Barth
- Department of Genetics, Angers Hospital and University, Angers, France
| | - Laurent Villard
- Medical Genetics Department, Timone Children Hospital, Marseille, France.,Aix Marseille University, INSERM, UMR-S 1251, MMG, Marseille, France
| | - Mathieu Milh
- Pediatric Neurology Department, Timone Children Hospital, Reference Center for Rare Epilepsies, APHM, Marseille, France.,Aix Marseille University, INSERM, UMR-S 1251, MMG, Marseille, France
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28
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Mignot C, McMahon AC, Bar C, Campeau PM, Davidson C, Buratti J, Nava C, Jacquemont ML, Tallot M, Milh M, Edery P, Marzin P, Barcia G, Barnerias C, Besmond C, Bienvenu T, Bruel AL, Brunga L, Ceulemans B, Coubes C, Cristancho AG, Cunningham F, Dehouck MB, Donner EJ, Duban-Bedu B, Dubourg C, Gardella E, Gauthier J, Geneviève D, Gobin-Limballe S, Goldberg EM, Hagebeuk E, Hamdan FF, Hančárová M, Hubert L, Ioos C, Ichikawa S, Janssens S, Journel H, Kaminska A, Keren B, Koopmans M, Lacoste C, Laššuthová P, Lederer D, Lehalle D, Marjanovic D, Métreau J, Michaud JL, Miller K, Minassian BA, Morales J, Moutard ML, Munnich A, Ortiz-Gonzalez XR, Pinard JM, Prchalová D, Putoux A, Quelin C, Rosen AR, Roume J, Rossignol E, Simon MEH, Smol T, Shur N, Shelihan I, Štěrbová K, Vyhnálková E, Vilain C, Soblet J, Smits G, Yang SP, van der Smagt JJ, van Hasselt PM, van Kempen M, Weckhuysen S, Helbig I, Villard L, Héron D, Koeleman B, Møller RS, Lesca G, Helbig KL, Nabbout R, Verbeek NE, Depienne C. IQSEC2-related encephalopathy in males and females: a comparative study including 37 novel patients. Genet Med 2018; 21:837-849. [PMID: 30206421 PMCID: PMC6752297 DOI: 10.1038/s41436-018-0268-1] [Citation(s) in RCA: 44] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2018] [Accepted: 07/31/2018] [Indexed: 12/19/2022] Open
Abstract
Purpose Variants in IQSEC2, escaping X inactivation, cause X-linked intellectual disability with frequent epilepsy in males and females. We aimed to investigate sex-specific differences. Methods We collected the data of 37 unpublished patients (18 males and 19 females) with IQSEC2 pathogenic variants and 5 individuals with variants of unknown significance and reviewed published variants. We compared variant types and phenotypes in males and females and performed an analysis of IQSEC2 isoforms. Results IQSEC2 pathogenic variants mainly led to premature truncation and were scattered throughout the longest brain-specific isoform, encoding the synaptic IQSEC2/BRAG1 protein. Variants occurred de novo in females but were either de novo (2/3) or inherited (1/3) in males, with missense variants being predominantly inherited. Developmental delay and intellectual disability were overall more severe in males than in females. Likewise, seizures were more frequently observed and intractable, and started earlier in males than in females. No correlation was observed between the age at seizure onset and severity of intellectual disability or resistance to antiepileptic treatments. Conclusion This study provides a comprehensive overview of IQSEC2-related encephalopathy in males and females, and suggests that an accurate dosage of IQSEC2 at the synapse is crucial during normal brain development.
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Affiliation(s)
- Cyril Mignot
- INSERM, U 1127, CNRS UMR 7225, Sorbonne Universites, UPMC Univ Paris 06 UMR S 1127, Institut du Cerveau et de la Moelle epiniere, ICM, Paris, France. .,APHP, Hôpital Pitie-Salpetriere, Departement de Genetique et de Cytogenetique; Centre de Reference Deficience Intellectuelle de Causes Rares; GRC UPMC «Deficience Intellectuelle et Autisme», Paris, France.
| | - Aoife C McMahon
- European Molecular Biology Laboratory, European Bioinformatics Institute, Wellcome Genome Campus, Hinxton, Cambridge, UK
| | - Claire Bar
- APHP, Reference Centre for Rare Epilepsies, Necker-Enfants Malades Hospital, Imagine Institute, Paris Descartes University, Paris, France.,INSERM U1163, Imagine Institute, Paris, France.,Paris Descartes University, Paris, France
| | - Philippe M Campeau
- Division of Medical Genetics, Department of Pediatrics, CHU Sainte-Justine and University of Montreal, Montreal, QC, Canada
| | - Claire Davidson
- European Molecular Biology Laboratory, European Bioinformatics Institute, Wellcome Genome Campus, Hinxton, Cambridge, UK
| | - Julien Buratti
- APHP, Hôpital Pitie-Salpetriere, Departement de Genetique et de Cytogenetique; Centre de Reference Deficience Intellectuelle de Causes Rares; GRC UPMC «Deficience Intellectuelle et Autisme», Paris, France
| | - Caroline Nava
- INSERM, U 1127, CNRS UMR 7225, Sorbonne Universites, UPMC Univ Paris 06 UMR S 1127, Institut du Cerveau et de la Moelle epiniere, ICM, Paris, France.,APHP, Hôpital Pitie-Salpetriere, Departement de Genetique et de Cytogenetique; Centre de Reference Deficience Intellectuelle de Causes Rares; GRC UPMC «Deficience Intellectuelle et Autisme», Paris, France
| | | | - Marilyn Tallot
- CHU La Reunion-Groupe Hospitalier Sud Reunion, La Reunion, France
| | - Mathieu Milh
- APHM, Hôpital d'Enfants de La Timone, Service de Neurologie Pediatrique, centre de reference deficiences intellectuelles de cause rare, Marseille, France.,Aix Marseille University, INSERM, MMG, UMR-S 1251, Faculte de medecine, Marseille, France
| | - Patrick Edery
- Service de Genetique, Centre de Reference Anomalies du Developpement, Hospices Civils de Lyon, Bron, France.,INSERM U1028, CNRS UMR5292, Centre de Recherche en Neurosciences de Lyon, GENDEV Team, Universite Claude Bernard Lyon 1, Bron, France.,Claude Bernard Lyon I University, Lyon, France
| | - Pauline Marzin
- APHP, Hôpital Pitie-Salpetriere, Departement de Genetique et de Cytogenetique; Centre de Reference Deficience Intellectuelle de Causes Rares; GRC UPMC «Deficience Intellectuelle et Autisme», Paris, France
| | - Giulia Barcia
- INSERM U1163, Imagine Institute, Paris, France.,Paris Descartes University, Paris, France.,APHP, Service de genetique medicale, Necker-Enfants Malades Hospital, Imagine Institute, Paris Descartes University, Paris, France
| | - Christine Barnerias
- APHP, Unite fonctionnelle de Neurologie, Necker-Enfants Malades Hospital, Imagine Institute, Paris Descartes University, Paris, France
| | - Claude Besmond
- INSERM U1163, Imagine Institute, Paris, France.,Paris Descartes University, Paris, France
| | - Thierry Bienvenu
- APHP, Laboratoire de Genetique et Biologie Moleculaires, Hôpital Cochin, HUPC, Paris, France.,Universite Paris Descartes Paris, Institut de Psychiatrie et de Neurosciences de Paris, Inserm U894, Paris, France
| | - Ange-Line Bruel
- FHU-TRANSLAD, Universite de Bourgogne/CHU Dijon, Dijon, France.,INSERM UMR 1231 GAD team, Genetics of Developmental disorders, Universite de Bourgogne-Franche Comte, Dijon, France
| | - Ledia Brunga
- Division of Neurology, Department of Paediatrics, The Hospital for Sick Children, University of Toronto, Toronto, ON, Canada
| | - Berten Ceulemans
- Department of Pediatric Neurology, University Hospital and University of Antwerp, Antwerp, Belgium
| | - Christine Coubes
- Departement de Genetique Medicale, Maladies rares et Medecine Personnalisee, CHU de Montpellier, Montpellier, France
| | - Ana G Cristancho
- Division of Neurology, Children's Hospital of Philadelphia, Philadelphia, PA, USA
| | - Fiona Cunningham
- European Molecular Biology Laboratory, European Bioinformatics Institute, Wellcome Genome Campus, Hinxton, Cambridge, UK
| | | | - Elizabeth J Donner
- Division of Neurology, Department of Paediatrics, The Hospital for Sick Children, University of Toronto, Toronto, ON, Canada
| | - Bénédicte Duban-Bedu
- Centre de Genetique Chromosomique, Hôpital St-Vincent-de-Paul, GHICL, Lille, France
| | - Christèle Dubourg
- CHU Rennes, Service de Genetique Moleculaire et Genomique, Rennes, France
| | - Elena Gardella
- Danish Epilepsy Centre Filadelfia, Dianalund, Denmark.,Institute for Regional Health Services, University of Southern Denmark, Odense, Denmark
| | - Julie Gauthier
- Division of Medical Genetics, Department of Pediatrics, CHU Sainte-Justine and University of Montreal, Montreal, QC, Canada
| | - David Geneviève
- Departement de Genetique Medicale, Maladies rares et Medecine Personnalisee, CHU de Montpellier, Montpellier, France.,INSERM U1183, Montpellier, France
| | - Stéphanie Gobin-Limballe
- APHP, Service de genetique medicale, Necker-Enfants Malades Hospital, Imagine Institute, Paris Descartes University, Paris, France
| | - Ethan M Goldberg
- Division of Neurology, Children's Hospital of Philadelphia, Philadelphia, PA, USA
| | - Eveline Hagebeuk
- Stichting Epilepsie Instellingen Nederland, SEIN, Zwolle, The Netherlands
| | - Fadi F Hamdan
- Division of Medical Genetics, Department of Pediatrics, CHU Sainte-Justine and University of Montreal, Montreal, QC, Canada
| | - Miroslava Hančárová
- Department of Biology and Medical Genetics, Charles University 2nd Faculty of Medicine and University Hospital Motol, Prague, Czech Republic
| | - Laurence Hubert
- INSERM U1163, Imagine Institute, Paris, France.,Paris Descartes University, Paris, France
| | - Christine Ioos
- APHP, University Hospital of Paris ïle-de-France ouest, Raymond Poincare Hospital, Garches, France
| | - Shoji Ichikawa
- Department of Clinical Diagnostics, Ambry Genetics, Aliso Viejo, CA, USA
| | - Sandra Janssens
- Centre for Medical Genetics Ghent, Ghent University Hospital, C. Heymanslaan 10, Ghent, Belgium
| | - Hubert Journel
- Service de Genetique Medicale, Hôpital Chubert, Vannes, France
| | - Anna Kaminska
- APHP, Department of Clinical Neurophysiology, Necker-Enfants Malades Hospital, Paris, France
| | - Boris Keren
- APHP, Hôpital Pitie-Salpetriere, Departement de Genetique et de Cytogenetique; Centre de Reference Deficience Intellectuelle de Causes Rares; GRC UPMC «Deficience Intellectuelle et Autisme», Paris, France
| | - Marije Koopmans
- Department of Genetics, University Medical Center Utrecht, Utrecht, The Netherlands
| | - Caroline Lacoste
- Departement de Genetique Medicale, APHM, Hopital d'Enfants de La Timone, Marseille, France
| | - Petra Laššuthová
- Child Neurology Department, 2nd Faculty of Medicine, Charles University and Motol Hospital, Prague, Czech Republic
| | - Damien Lederer
- Centre de Genetique Humaine, Institut de Pathologie et de Genetique, Gosselies, Belgium
| | - Daphné Lehalle
- FHU-TRANSLAD, Universite de Bourgogne/CHU Dijon, Dijon, France.,Unite fonctionnelle de genetique clinique, Centre Hospitalier Intercommunal de Creteil, Creteil, France
| | | | - Julia Métreau
- APHP, Service de neurologie pediatrique, Hôpital Universitaire Bicetre, Le Kremlin-Bicetre, France
| | - Jacques L Michaud
- Division of Medical Genetics, Department of Pediatrics, CHU Sainte-Justine and University of Montreal, Montreal, QC, Canada
| | - Kathryn Miller
- Department of Pediatrics, Albany Medical Center, Albany, NY, USA
| | - Berge A Minassian
- Division of Neurology, Department of Paediatrics, The Hospital for Sick Children, University of Toronto, Toronto, ON, Canada
| | - Joannella Morales
- European Molecular Biology Laboratory, European Bioinformatics Institute, Wellcome Genome Campus, Hinxton, Cambridge, UK
| | - Marie-Laure Moutard
- APHP, Hôpital Trousseau, service de neuropediatrie, Paris, France.,Sorbonne Universite, GRC n°19, pathologies Congenitales du Cervelet-LeucoDystrophies, APHP, Hôpital Armand Trousseau, Paris, France
| | - Arnold Munnich
- INSERM U1163, Imagine Institute, Paris, France.,Paris Descartes University, Paris, France.,APHP, Service de genetique medicale, Necker-Enfants Malades Hospital, Imagine Institute, Paris Descartes University, Paris, France
| | | | - Jean-Marc Pinard
- Division of Neuropediatrics, CHU Raymond Poincare (APHP), Garches, France
| | - Darina Prchalová
- Department of Biology and Medical Genetics, Charles University 2nd Faculty of Medicine and University Hospital Motol, Prague, Czech Republic
| | - Audrey Putoux
- Service de Genetique, Centre de Reference Anomalies du Developpement, Hospices Civils de Lyon, Bron, France.,INSERM U1028, CNRS UMR5292, Centre de Recherche en Neurosciences de Lyon, GENDEV Team, Universite Claude Bernard Lyon 1, Bron, France.,Claude Bernard Lyon I University, Lyon, France
| | - Chloé Quelin
- Service de Genetique Medicale, CLAD Ouest CHU Hôpital Sud, Rennes, France
| | - Alyssa R Rosen
- Division of Neurology, Children's Hospital of Philadelphia, Philadelphia, PA, USA
| | - Joelle Roume
- Unite de Genetique Medicale, Centre de Reference des Maladies rares du Developpement (AnD DI Rares), CHI Poissy-St Germain en Laye, Poissy, France
| | - Elsa Rossignol
- Departments of Pediatrics and Neurosciences, CHU Sainte-Justine and University of Montreal, Montreal, Canada
| | - Marleen E H Simon
- Department of Genetics, University Medical Center Utrecht, Utrecht, The Netherlands
| | - Thomas Smol
- Institut de Genetique Medicale, CHRU Lille, Universite de Lille, Lille, France
| | - Natasha Shur
- Department of Pediatrics, Albany Medical Center, Albany, NY, USA
| | - Ivan Shelihan
- Division of Medical Genetics, Department of Pediatrics, CHU Sainte-Justine and University of Montreal, Montreal, QC, Canada
| | - Katalin Štěrbová
- Child Neurology Department, 2nd Faculty of Medicine, Charles University and Motol Hospital, Prague, Czech Republic
| | - Emílie Vyhnálková
- Department of Biology and Medical Genetics, Charles University 2nd Faculty of Medicine and University Hospital Motol, Prague, Czech Republic
| | - Catheline Vilain
- Department of Genetics, Hôpital Universitaire des Enfants Reine Fabiola, ULB Center of Human Genetics, Universite Libre de Bruxelles, Brussels, Belgium.,Department of Genetics, Hôpital Erasme, ULB Center of Human Genetics, Universite Libre de Bruxelles, Brussels, Belgium.,Interuniversity Institute of Bioinformatics in Brussels, Universite Libre de Bruxelles, Brussels, Belgium
| | - Julie Soblet
- Department of Genetics, Hôpital Universitaire des Enfants Reine Fabiola, ULB Center of Human Genetics, Universite Libre de Bruxelles, Brussels, Belgium.,Department of Genetics, Hôpital Erasme, ULB Center of Human Genetics, Universite Libre de Bruxelles, Brussels, Belgium.,Interuniversity Institute of Bioinformatics in Brussels, Universite Libre de Bruxelles, Brussels, Belgium
| | - Guillaume Smits
- Department of Genetics, Hôpital Universitaire des Enfants Reine Fabiola, ULB Center of Human Genetics, Universite Libre de Bruxelles, Brussels, Belgium.,Department of Genetics, Hôpital Erasme, ULB Center of Human Genetics, Universite Libre de Bruxelles, Brussels, Belgium.,Interuniversity Institute of Bioinformatics in Brussels, Universite Libre de Bruxelles, Brussels, Belgium
| | - Samuel P Yang
- Clinical Genomics & Predictive Medicine, Providence Medical Group, Dayton, WA, USA
| | | | - Peter M van Hasselt
- Department of Metabolic Diseases, Wilhelmina Children's Hospital, University Medical Center, Utrecht, The Netherlands
| | - Marjan van Kempen
- Department of Genetics, University Medical Center Utrecht, Utrecht, The Netherlands
| | - Sarah Weckhuysen
- Neurogenetics Group, Center of Molecular Neurology, VIB, Antwerp, Belgium.,Neurology Department, University Hospital Antwerp, Antwerp, Belgium
| | - Ingo Helbig
- Division of Neurology, Children's Hospital of Philadelphia, Philadelphia, PA, USA
| | - Laurent Villard
- Aix Marseille University, INSERM, MMG, UMR-S 1251, Faculte de medecine, Marseille, France.,Departement de Genetique Medicale, APHM, Hopital d'Enfants de La Timone, Marseille, France
| | - Delphine Héron
- APHP, Hôpital Pitie-Salpetriere, Departement de Genetique et de Cytogenetique; Centre de Reference Deficience Intellectuelle de Causes Rares; GRC UPMC «Deficience Intellectuelle et Autisme», Paris, France
| | - Bobby Koeleman
- Department of Genetics, University Medical Center Utrecht, Utrecht, The Netherlands
| | - Rikke S Møller
- CHU Rennes, Service de Genetique Moleculaire et Genomique, Rennes, France.,Danish Epilepsy Centre Filadelfia, Dianalund, Denmark
| | - Gaetan Lesca
- Service de Genetique, Centre de Reference Anomalies du Developpement, Hospices Civils de Lyon, Bron, France.,INSERM U1028, CNRS UMR5292, Centre de Recherche en Neurosciences de Lyon, GENDEV Team, Universite Claude Bernard Lyon 1, Bron, France.,Claude Bernard Lyon I University, Lyon, France
| | - Katherine L Helbig
- Division of Neurology, Children's Hospital of Philadelphia, Philadelphia, PA, USA
| | - Rima Nabbout
- APHP, Reference Centre for Rare Epilepsies, Necker-Enfants Malades Hospital, Imagine Institute, Paris Descartes University, Paris, France.,INSERM U1163, Imagine Institute, Paris, France.,Paris Descartes University, Paris, France
| | - Nienke E Verbeek
- Department of Genetics, University Medical Center Utrecht, Utrecht, The Netherlands
| | - Christel Depienne
- INSERM, U 1127, CNRS UMR 7225, Sorbonne Universites, UPMC Univ Paris 06 UMR S 1127, Institut du Cerveau et de la Moelle epiniere, ICM, Paris, France. .,IGBMC, CNRS UMR 7104/INSERM U964/Universite de Strasbourg, Illkirch, France. .,Institute of Human Genetics, University Hospital Essen, University of Duisburg-Essen, Essen, Germany.
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29
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Bramswig NC, Bertoli-Avella AM, Albrecht B, Al Aqeel AI, Alhashem A, Al-Sannaa N, Bah M, Bröhl K, Depienne C, Dorison N, Doummar D, Ehmke N, Elbendary HM, Gorokhova S, Héron D, Horn D, James K, Keren B, Kuechler A, Ismail S, Issa MY, Marey I, Mayer M, McEvoy-Venneri J, Megarbane A, Mignot C, Mohamed S, Nava C, Philip N, Ravix C, Rolfs A, Sadek AA, Segebrecht L, Stanley V, Trautman C, Valence S, Villard L, Wieland T, Engels H, Strom TM, Zaki MS, Gleeson JG, Lüdecke HJ, Bauer P, Wieczorek D. Genetic variants in components of the NALCN-UNC80-UNC79 ion channel complex cause a broad clinical phenotype (NALCN channelopathies). Hum Genet 2018; 137:753-768. [PMID: 30167850 DOI: 10.1007/s00439-018-1929-5] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2018] [Accepted: 08/13/2018] [Indexed: 12/30/2022]
Abstract
NALCN is a conserved cation channel, which conducts a permanent sodium leak current and regulates resting membrane potential and neuronal excitability. It is part of a large ion channel complex, the "NALCN channelosome", consisting of multiple proteins including UNC80 and UNC79. The predominant neuronal expression pattern and its function suggest an important role in neuronal function and disease. So far, biallelic NALCN and UNC80 variants have been described in a small number of individuals leading to infantile hypotonia, psychomotor retardation, and characteristic facies 1 (IHPRF1, OMIM 615419) and 2 (IHPRF2, OMIM 616801), respectively. Heterozygous de novo NALCN missense variants in the S5/S6 pore-forming segments lead to congenital contractures of the limbs and face, hypotonia, and developmental delay (CLIFAHDD, OMIM 616266) with some clinical overlap. In this study, we present detailed clinical information of 16 novel individuals with biallelic NALCN variants, 1 individual with a heterozygous de novo NALCN missense variant and an interesting clinical phenotype without contractures, and 12 individuals with biallelic UNC80 variants. We report for the first time a missense NALCN variant located in the predicted S6 pore-forming unit inherited in an autosomal-recessive manner leading to mild IHPRF1. We show evidence of clinical variability, especially among IHPRF1-affected individuals, and discuss differences between the IHPRF1- and IHPRF2 phenotypes. In summary, we provide a comprehensive overview of IHPRF1 and IHPRF2 phenotypes based on the largest cohort of individuals reported so far and provide additional insights into the clinical phenotypes of these neurodevelopmental diseases to help improve counseling of affected families.
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Affiliation(s)
- Nuria C Bramswig
- Institut für Humangenetik, Universitätsklinikum Essen, Universität Duisburg-Essen, Hufelandstr. 55, 45122, Essen, Germany.
| | | | - Beate Albrecht
- Institut für Humangenetik, Universitätsklinikum Essen, Universität Duisburg-Essen, Hufelandstr. 55, 45122, Essen, Germany
| | - Aida I Al Aqeel
- Department of Pediatrics, Prince Sultan Military Medical City, Riyadh, Saudi Arabia.,American University of Beirut, Beirut, Lebanon.,Alfaisal University, Riyadh, Saudi Arabia
| | - Amal Alhashem
- Department of Pediatrics, Prince Sultan Military Medical City, Riyadh, Saudi Arabia.,Department of Anatomy and Cell Biology, College of Medicine, Alfaisal University, Riyadh, Saudi Arabia
| | - Nouriya Al-Sannaa
- John Hopkins Aramco Health Care, Pediatric Services, Dhahran, Saudi Arabia
| | - Maissa Bah
- Groupe de Recherche Clinique sorbonne Université "Déficiences Intellectuelles et Autisme", Département de Génétique, Centre de Référence Déficiences Intellectuelles de Causes Rares, AP-HP, Hôpital de la Pitié Salpêtrière, 75013, Paris, France
| | - Katharina Bröhl
- Internal Medicine Department, Waldkrankenhaus Evangelical Hospital, Berlin, Germany
| | - Christel Depienne
- Institut für Humangenetik, Universitätsklinikum Essen, Universität Duisburg-Essen, Hufelandstr. 55, 45122, Essen, Germany.,Sorbonne Universités, UPMC Univ Paris 06, UMR S 1127, and Inserm U 1127, and CNRS UMR 7225, and ICM, 75013, Paris, France
| | - Nathalie Dorison
- Service de Neurochirurgie Pédiatrique, Fondation Ophtalmologique Adolphe de Rothschild, Paris, France
| | - Diane Doummar
- AP-HP, Département de neuropédiatrie, GHUEP, Hôpital Armand Trousseau, Paris, France
| | - Nadja Ehmke
- Institute of Medical and Human Genetics, Charité-Universitätsmedizin Berlin, Berlin, Germany.,Berlin Institute of Health, Berlin, Germany
| | - Hasnaa M Elbendary
- Human Genetics and Genome Research Division, Clinical Genetics Department, National Research Centre, Cairo, Egypt
| | - Svetlana Gorokhova
- Département de Génétique Médicale, APHM, CHU Timone Enfants, Marseille, France.,Aix Marseille Univ, MMG, INSERM, Marseille, France
| | - Delphine Héron
- Groupe de Recherche Clinique sorbonne Université "Déficiences Intellectuelles et Autisme", Département de Génétique, Centre de Référence Déficiences Intellectuelles de Causes Rares, AP-HP, Hôpital de la Pitié Salpêtrière, 75013, Paris, France
| | - Denise Horn
- Institute of Medical and Human Genetics, Charité-Universitätsmedizin Berlin, Berlin, Germany
| | - Kiely James
- Departments of Neurosciences and Pediatrics, Howard Hughes Medical Institute, University of California San Diego, Rady Children's Institute for Genomic Medicine, La Jolla, CA, 92093, USA
| | - Boris Keren
- Groupe de Recherche Clinique sorbonne Université "Déficiences Intellectuelles et Autisme", Département de Génétique, Centre de Référence Déficiences Intellectuelles de Causes Rares, AP-HP, Hôpital de la Pitié Salpêtrière, 75013, Paris, France
| | - Alma Kuechler
- Institut für Humangenetik, Universitätsklinikum Essen, Universität Duisburg-Essen, Hufelandstr. 55, 45122, Essen, Germany
| | - Samira Ismail
- Human Genetics and Genome Research Division, Clinical Genetics Department, National Research Centre, Cairo, Egypt
| | - Mahmoud Y Issa
- Human Genetics and Genome Research Division, Clinical Genetics Department, National Research Centre, Cairo, Egypt
| | - Isabelle Marey
- Groupe de Recherche Clinique sorbonne Université "Déficiences Intellectuelles et Autisme", Département de Génétique, Centre de Référence Déficiences Intellectuelles de Causes Rares, AP-HP, Hôpital de la Pitié Salpêtrière, 75013, Paris, France
| | - Michèle Mayer
- AP-HP, Département de neuropédiatrie, GHUEP, Hôpital Armand Trousseau, Paris, France
| | - Jennifer McEvoy-Venneri
- Departments of Neurosciences and Pediatrics, Howard Hughes Medical Institute, University of California San Diego, Rady Children's Institute for Genomic Medicine, La Jolla, CA, 92093, USA
| | - Andre Megarbane
- CEMEDIPP-Centre Medico Psychopedagogique, Beirut, Lebanon.,Institut Jerome Lejeune, Paris, France
| | - Cyril Mignot
- Groupe de Recherche Clinique sorbonne Université "Déficiences Intellectuelles et Autisme", Département de Génétique, Centre de Référence Déficiences Intellectuelles de Causes Rares, AP-HP, Hôpital de la Pitié Salpêtrière, 75013, Paris, France
| | - Sarar Mohamed
- Department of Pediatrics, Prince Sultan Military Medical City, Riyadh, Saudi Arabia.,Prince Abdullah bin Khaled Coeliac Disease Research Chair, College of Medicine, King Saud University, Riyadh, Saudi Arabia
| | - Caroline Nava
- Groupe de Recherche Clinique sorbonne Université "Déficiences Intellectuelles et Autisme", Département de Génétique, Centre de Référence Déficiences Intellectuelles de Causes Rares, AP-HP, Hôpital de la Pitié Salpêtrière, 75013, Paris, France.,Sorbonne Universités, UPMC Univ Paris 06, UMR S 1127, and Inserm U 1127, and CNRS UMR 7225, and ICM, 75013, Paris, France
| | - Nicole Philip
- Département de Génétique Médicale, APHM, CHU Timone Enfants, Marseille, France.,Aix Marseille Univ, MMG, INSERM, Marseille, France
| | - Cecile Ravix
- Aix Marseille Univ, MMG, INSERM, Marseille, France
| | - Arndt Rolfs
- CENTOGENE AG, The Rare Disease Company, Rostock, Germany.,Albrecht Kossel Institute, University of Rostock, Rostock, Germany
| | - Abdelrahim Abdrabou Sadek
- Pediatric Neurology Unit, Department of Pediatrics, Faculty of Medicine, Sohag University, Sohâg, Egypt
| | - Lara Segebrecht
- Institute of Medical and Human Genetics, Charité-Universitätsmedizin Berlin, Berlin, Germany.,Berlin Institute of Health, Berlin, Germany
| | - Valentina Stanley
- Departments of Neurosciences and Pediatrics, Howard Hughes Medical Institute, University of California San Diego, Rady Children's Institute for Genomic Medicine, La Jolla, CA, 92093, USA
| | - Camille Trautman
- Departments of Neurosciences and Pediatrics, Howard Hughes Medical Institute, University of California San Diego, Rady Children's Institute for Genomic Medicine, La Jolla, CA, 92093, USA
| | - Stephanie Valence
- AP-HP, Département de neuropédiatrie, GHUEP, Hôpital Armand Trousseau, Paris, France
| | - Laurent Villard
- Département de Génétique Médicale, APHM, CHU Timone Enfants, Marseille, France.,Aix Marseille Univ, MMG, INSERM, Marseille, France
| | - Thomas Wieland
- Institute of Human Genetics, Helmholtz Zentrum München, Neuherberg, Germany
| | - Hartmut Engels
- Institute of Human Genetics, University of Bonn, School of Medicine and University Hospital Bonn, Bonn, Germany
| | - Tim M Strom
- Institute of Human Genetics, Helmholtz Zentrum München, Neuherberg, Germany.,Institute of Human Genetics, Technische Universität München, Munich, Germany
| | - Maha S Zaki
- Human Genetics and Genome Research Division, Clinical Genetics Department, National Research Centre, Cairo, Egypt
| | - Joseph G Gleeson
- Departments of Neurosciences and Pediatrics, Howard Hughes Medical Institute, University of California San Diego, Rady Children's Institute for Genomic Medicine, La Jolla, CA, 92093, USA
| | - Hermann-Josef Lüdecke
- Institut für Humangenetik, Universitätsklinikum Essen, Universität Duisburg-Essen, Hufelandstr. 55, 45122, Essen, Germany.,Institut für Humangenetik, Universitätsklinikum Düsseldorf, Heinrich-Heine-Universität Düsseldorf, Düsseldorf, Germany
| | - Peter Bauer
- CENTOGENE AG, The Rare Disease Company, Rostock, Germany
| | - Dagmar Wieczorek
- Institut für Humangenetik, Universitätsklinikum Essen, Universität Duisburg-Essen, Hufelandstr. 55, 45122, Essen, Germany.,Institut für Humangenetik, Universitätsklinikum Düsseldorf, Heinrich-Heine-Universität Düsseldorf, Düsseldorf, Germany
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30
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Mignon-Ravix C, Milh M, Kaiser CS, Daniel J, Riccardi F, Cacciagli P, Nagara M, Busa T, Liebau E, Villard L. Abnormal function of the UBA5 protein in a case of early developmental and epileptic encephalopathy with suppression-burst. Hum Mutat 2018; 39:934-938. [PMID: 29663568 DOI: 10.1002/humu.23534] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2018] [Revised: 04/03/2018] [Accepted: 04/11/2018] [Indexed: 01/19/2023]
Abstract
Early myoclonic epilepsy (EME) or Aicardi syndrome is one of the most severe epileptic syndromes affecting neonates. We performed whole exome sequencing in a sporadic case affected by EME and his parents. In the proband, we identified a homozygous missense variant in the ubiquitin-like modifier activating enzyme 5 (UBA5) gene, encoding a protein involved in post-translational modifications. Functional analysis of the UBA5 variant protein reveals that it is almost completely unable to perform its trans-thiolation activity. Although recessive variants in UBA5 have recently been associated with epileptic encephalopathy, variants in this gene have never been reported to cause EME. Our results further demonstrate the importance of post-translational modifications such as the addition of an ubiquitin-fold modifier 1 (UFM1) to target proteins (ufmylation) for normal neuronal networks activity, and reveal that the dysfunction of the ubiquitous UBA5 protein is a cause of EME.
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Affiliation(s)
- Cécile Mignon-Ravix
- Aix Marseille Univ, Inserm, UMR-S 1251, MMG, Faculté de Médecine, Marseille, France
| | - Mathieu Milh
- Aix Marseille Univ, Inserm, UMR-S 1251, MMG, Faculté de Médecine, Marseille, France.,Service de Neurologie Pédiatrique, Hôpital d'Enfants de La Timone, Marseille, France
| | | | - Jens Daniel
- Department of Molecular Physiology, University of Muenster, Muenster, Germany
| | - Florence Riccardi
- Aix Marseille Univ, Inserm, UMR-S 1251, MMG, Faculté de Médecine, Marseille, France.,Département de Génétique Médicale, Hôpital d'Enfants de La Timone, Marseille, France
| | - Pierre Cacciagli
- Aix Marseille Univ, Inserm, UMR-S 1251, MMG, Faculté de Médecine, Marseille, France.,Département de Génétique Médicale, Hôpital d'Enfants de La Timone, Marseille, France
| | - Majdi Nagara
- Aix Marseille Univ, Inserm, UMR-S 1251, MMG, Faculté de Médecine, Marseille, France
| | - Tiffany Busa
- Aix Marseille Univ, Inserm, UMR-S 1251, MMG, Faculté de Médecine, Marseille, France.,Département de Génétique Médicale, Hôpital d'Enfants de La Timone, Marseille, France
| | - Eva Liebau
- Department of Molecular Physiology, University of Muenster, Muenster, Germany
| | - Laurent Villard
- Aix Marseille Univ, Inserm, UMR-S 1251, MMG, Faculté de Médecine, Marseille, France.,Département de Génétique Médicale, Hôpital d'Enfants de La Timone, Marseille, France
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31
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Abstract
Rett Syndrome is a severe neurological disorder mainly due to
de novo mutations in the methyl-CpG-binding protein 2 gene (
MECP2). Mecp2 is known to play a role in chromatin organization and transcriptional regulation. In this review, we report the latest advances on the molecular function of Mecp2 and the new animal and cellular models developed to better study Rett syndrome. Finally, we present the latest innovative therapeutic approaches, ranging from classical pharmacology to correct symptoms to more innovative approaches intended to cure the pathology.
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Affiliation(s)
- Yann Ehinger
- Aix Marseille Univ, INSERM, MMG, 13385 Marseille, France
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32
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Mancini J, Dubus JC, Jouve E, Roux JC, Franco P, Lagrue E, Castelnau P, Cances C, Chaix Y, Rougeot-Jung C, Cornu C, Desportes V, Vallée L, Bahi-Buisson N, Truillet R, Attolini L, Villard L, Blin O, Micallef J. Effect of desipramine on patients with breathing disorders in RETT syndrome. Ann Clin Transl Neurol 2017; 5:118-127. [PMID: 29468173 PMCID: PMC5817841 DOI: 10.1002/acn3.468] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2017] [Accepted: 08/21/2017] [Indexed: 12/27/2022] Open
Abstract
Objective Rett Syndrome (RTT) is a severe neurodevelopmental condition with breathing disorders, affecting around one in 10,000 female births. Desipramine, a noradrenaline reuptake inhibitor, reduced the number of apneas in Mecp2-deficient mice, a model of RTT. We planned a phase 2 trial to test its efficacy and its safety on breathing patterns in 36 girls with RTT. Methods The trial was a 6-month, multicenter, randomized, double-blind, placebo-controlled study registered with ClinicalTrials.gov, number NCT00990691. Girls diagnosed according to clinical examination and confirmed by genotyping were randomly assigned in a 1:1:1 ratio to receive 2-3 mg/kg Desipramine per day (high Desipramine), 1-2 mg/kg Desipramine per day (low Desipramine), or a placebo. The primary outcome was the change of apnea hypopnea index (AHI), defined by the number of apnea and hypopnea events per hour, assessed at 6 months from baseline. Intention-to-treat analysis was applied. Results The median change in AHI from baseline to 6 months was -31 (IQR: -37 to -11) for the high Desipramine, -17.5 (IQR: -31 to 13) for the low Desipramine, and -13 (IQR:-31 to 0) for the placebo group. We did not find any significant difference in these changes between the groups (P = 0.781). A significant inverse correlation between Desipramine plasma concentration and AHI (r = -0.44; P = 0.0002) was underlined. Interpretation This first clinical trial of desipramine did not show clinical efficacy. Although required further studies, the significant correlation between Desipramine concentrations and improvement of AHI provided additional and relevant reasons to test the noradrenergic pathway in RTT.
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Affiliation(s)
- Josette Mancini
- Neuropediatric Unit Aix Marseille University Children Hospital APHM, Timone, Neurosciences Institute Marseille France
| | - Jean-Christophe Dubus
- Pneumology Pediatric Unit Aix Marseille University Children Hospital CNRS URMITE 6236A PHM Marseille France
| | - Elisabeth Jouve
- Department of Pharmacology F-CRIN Orphan DEV Timone Neurosciences Institute Aix Marseille University CNRS INTAPHM, CIC CPCET CHU Timone Marseille France
| | | | - Patricia Franco
- Neuropediatric Ward Hypnology Unit Lyon University Civil Hospices of Lyon INSERM U628 Lyon France
| | - Emmanuelle Lagrue
- Neuropediatrics and Handicap Department Tours University INSERM, UMR U930 Imaging and Brain, CHRU Tours Tours France
| | - Pierre Castelnau
- Neuropediatrics and Handicap Department Tours University INSERM, UMR U930 Imaging and Brain, CHRU Tours Tours France
| | - Claude Cances
- Neuropediatric Unit Neuro Imaging Center Toulouse University Children Hospital CHU PURPANUMR 1214 Toulouse France
| | - Yves Chaix
- Neuropediatric Unit Neuro Imaging Center Toulouse University Children Hospital CHU PURPANUMR 1214 Toulouse France
| | - Christelle Rougeot-Jung
- Lyon University National Reference Center for Rare Diseases with Intellectual Disability HFME Hospices Civils de Lyon Lyon France.,CNRS UMR 5304 ISC Lyon France
| | - Catherine Cornu
- Department of Pharmacotoxicology Clinical Investigation Center Hospices Civils de Lyon INSERM 1407 Lyon France.,Lyon University CNRS UMR 5558 Lyon France
| | - Vincent Desportes
- Lyon University National Reference Center for Rare Diseases with Intellectual Disability HFME Hospices Civils de Lyon Lyon France.,CNRS UMR 5304 ISC Lyon France
| | - Louis Vallée
- Department of Neuropediatrics Lille North 2 University CHRU Hôpital Roger Salengro Lille France
| | - Nadia Bahi-Buisson
- Imagine Institute and INSERM UMR-1163 Embryology and Genetics of Congenital Malformations Pediatric Neurology Paris Descartes - Sorbonne Paris Cité University Necker Enfants Malades University Hospital AP-HP Paris France
| | - Romain Truillet
- Department of Pharmacology F-CRIN Orphan DEV Timone Neurosciences Institute Aix Marseille University CNRS INTAPHM, CIC CPCET CHU Timone Marseille France
| | - Laurence Attolini
- Department of Pharmacology F-CRIN Orphan DEV Timone Neurosciences Institute Aix Marseille University CNRS INTAPHM, CIC CPCET CHU Timone Marseille France
| | - Laurent Villard
- Aix Marseille University INSERM, GMGF UMR_S 910 Marseille France
| | - Olivier Blin
- Department of Pharmacology F-CRIN Orphan DEV Timone Neurosciences Institute Aix Marseille University CNRS INTAPHM, CIC CPCET CHU Timone Marseille France
| | - Joëlle Micallef
- Department of Pharmacology F-CRIN Orphan DEV Timone Neurosciences Institute Aix Marseille University CNRS INTAPHM, CIC CPCET CHU Timone Marseille France
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33
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Mortreux J, Busa T, Germain DP, Nadeau G, Puechberty J, Coubes C, Gatinois V, Cacciagli P, Duffourd Y, Pinard JM, Tevissen H, Villard L, Sanlaville D, Philip N, Missirian C. The role of CNVs in the etiology of rare autosomal recessive disorders: the example of TRAPPC9-associated intellectual disability. Eur J Hum Genet 2017; 26:143-148. [PMID: 29187737 DOI: 10.1038/s41431-017-0018-x] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2017] [Revised: 09/07/2017] [Accepted: 09/09/2017] [Indexed: 12/23/2022] Open
Abstract
INTRODUCTION A large number of genes involved in autosomal recessive forms of intellectual disability (ID) were identified over the past few years through whole-exome sequencing (WES) or whole-genome sequencing in consanguineous families. Disease-associated variants in TRAPPC9 were reported in eight multiplex consanguineous sibships from different ethnic backgrounds, and led to the delineation of the phenotype. Affected patients have microcephaly, obesity, normal motor development, severe ID, and language impairment and brain anomalies. PATIENTS We report six new patients recruited through a national collaborative network. RESULTS In the two patients heterozygous for a copy-number variation (CNV), the phenotype was clinically relevant with regard to the literature, which prompted to sequence the second allele, leading to identification of disease-associated variants in both. The third patient was homozygote for an intragenic TRAPPC9 CNV. The phenotype of the patients reported was concordant with the literature. Recent reports emphasized the role of CNVs in the etiology of rare recessive disorders. CONCLUSION This study demonstrates that CNVs significantly contribute to the mutational spectrum of TRAPPC9 gene, and also confirms the interest of combining WES with CNV analysis to provide a molecular diagnosis to patients with rare Mendelian disorders.
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Affiliation(s)
- Jérémie Mortreux
- Département de Génétique Médicale, APHM, CHU Timone Enfants, Marseille, France.
| | - Tiffany Busa
- Département de Génétique Médicale, APHM, CHU Timone Enfants, Marseille, France
| | - Dominique P Germain
- Division of Medical Genetics, University of Versailles, 78180, Montigny, France.,CHU Raymond Poincaré (AP-HP), Garches, France
| | - Gwenaël Nadeau
- UF de génétique chromosomique, Centre hospitalier métropole Savoie, Chambéry, France
| | - Jacques Puechberty
- Département de Génétique Médicale, Maladies rares et Médecine Personnalisée, CHU de Montpellier, France
| | - Christine Coubes
- Département de Génétique Médicale, Maladies rares et Médecine Personnalisée, CHU de Montpellier, France
| | - Vincent Gatinois
- Laboratoire de Génétique Chromosomique, CHU de Montpellier, France
| | | | - Yannis Duffourd
- Fédération Hospitalo-Universitaire Médecine Translationnelle et Anomalies du Développement (FHU TRANSLAD), CHU de Dijon et Université de Bourgogne-Franche Comté, Dijon, France.,Equipe d'Accueil 42271, Génétique des Anomalies du Développement, Université de Bourgogne, Dijon, France
| | - Jean-Marc Pinard
- Division of Neuropediatrics, CHU Raymond Poincaré (AP-HP), Garches, France
| | | | - Laurent Villard
- Aix Marseille Université, GMGF, Inserm, UMR_S 910, Marseille, France
| | - Damien Sanlaville
- Department of Genetics, Lyon University Hospitals, Lyon, France.,Lyon Neuroscience Research Centre, CNRS UMR5292, Inserm U1028, Lyon, France.,Claude Bernard Lyon I University, Lyon, France
| | - Nicole Philip
- Département de Génétique Médicale, APHM, CHU Timone Enfants, Marseille, France.,Aix Marseille Université, GMGF UMR_S 910, Marseille, France
| | - Chantal Missirian
- Département de Génétique Médicale, APHM, CHU Timone Enfants, Marseille, France
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34
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Villeneuve N, Abidi A, Cacciagli P, Mignon-Ravix C, Chabrol B, Villard L, Milh M. Heterogeneity of FHF1 related phenotype: Novel case with early onset severe attacks of apnea, partial mitochondrial respiratory chain complex II deficiency, neonatal onset seizures without neurodegeneration. Eur J Paediatr Neurol 2017; 21:783-786. [PMID: 28506426 DOI: 10.1016/j.ejpn.2017.04.001] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/30/2016] [Revised: 03/09/2017] [Accepted: 04/06/2017] [Indexed: 11/26/2022]
Abstract
INTRODUCTION/OBJECTIVES We report the case of a child prospectively followed in our institution for a severe, neonatal onset epilepsy presenting with severe attacks of apnea that were not initially recognized as seizure since they were not associated with any abnormal movement and since interictal EEG was normal. Recording of attacks using prolonged video-EEG recording allowed to confirm the diagnosis of epileptic seizures. RESULTS Using whole exome sequencing we found a de novo heterozygous, missense mutation of FHF1 (p.Arg52His, NM_004113), a mutation that has been very recently described in 7 patients with an early onset epileptic encephalopathy. The initial workup showed a partial deficit of the complex II of the respiratory chain in muscle and liver. The prospective follow-up demonstrated that 2 drugs seemed to be more effective than the others: sodium blocker carbamazepine, and serotonin reuptake blocker fluoxetine. GABAergic drugs seemed to be ineffective. No drug aggravated the epilepsy. DISCUSSION This case report contributes to the description of an emerging phenotype for this condition.
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Affiliation(s)
- Nathalie Villeneuve
- APHM, Department of Pediatric Neurology, Hopital de la Timone, Marseille, France
| | - Affef Abidi
- AIx Marseille univ, INSERM, GMGF, UMR_S 910, Faculté de médecine, Marseille, France
| | - Pierre Cacciagli
- AIx Marseille univ, INSERM, GMGF, UMR_S 910, Faculté de médecine, Marseille, France
| | - Cécile Mignon-Ravix
- AIx Marseille univ, INSERM, GMGF, UMR_S 910, Faculté de médecine, Marseille, France
| | - Brigitte Chabrol
- APHM, Department of Pediatric Neurology, Hopital de la Timone, Marseille, France
| | - Laurent Villard
- AIx Marseille univ, INSERM, GMGF, UMR_S 910, Faculté de médecine, Marseille, France.
| | - Mathieu Milh
- APHM, Department of Pediatric Neurology, Hopital de la Timone, Marseille, France; AIx Marseille univ, INSERM, GMGF, UMR_S 910, Faculté de médecine, Marseille, France.
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35
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Sauvestre F, Moutton S, Badens C, Broussin B, Carles D, Houcinat N, Lacoste C, Marguet F, Pecheux C, Villard L, Pelluard F, Laquerrière A, André G. In utero
seizures revealing dentato-olivary dysplasia caused by SCN2A
mutation. Neuropathol Appl Neurobiol 2017; 43:631-635. [DOI: 10.1111/nan.12409] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2017] [Revised: 04/05/2017] [Accepted: 05/10/2017] [Indexed: 11/28/2022]
Affiliation(s)
- F. Sauvestre
- Department of Pathology; Bordeaux University hospital; Bordeaux France
| | - S. Moutton
- Department of Medical Genetic; Bordeaux University Hospital; Bordeaux France
| | - C. Badens
- Department of Medical Genetic; APHM; Timone Hospital; Aix Marseille University; GMGF; Inserm; UMR 910; Marseille France
| | - B. Broussin
- Radiology center; 120 bis rue Georges Bonnac Bordeaux France
| | - D. Carles
- Department of Pathology; Bordeaux University hospital; Bordeaux France
| | - N. Houcinat
- Department of Medical Genetic; Bordeaux University Hospital; Bordeaux France
| | - C. Lacoste
- Department of Medical Genetic; APHM; Timone Hospital; Aix Marseille University; GMGF; Inserm; UMR 910; Marseille France
| | - F. Marguet
- Pathology Laboratory; Rouen University Hospital and Normandie University; UNIROUEN; NéoVasc; Rouen France
| | - C. Pecheux
- Department of Medical Genetic; APHM; Timone Hospital; Aix Marseille University; GMGF; Inserm; UMR 910; Marseille France
| | - L. Villard
- Department of Medical Genetic; APHM; Timone Hospital; Aix Marseille University; GMGF; Inserm; UMR 910; Marseille France
| | - F. Pelluard
- Department of Pathology; Bordeaux University hospital; Bordeaux France
| | - A. Laquerrière
- Pathology Laboratory; Rouen University Hospital and Normandie University; UNIROUEN; NéoVasc; Rouen France
| | - G. André
- Department of Pathology; Bordeaux University hospital; Bordeaux France
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36
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Wolff M, Johannesen KM, Hedrich UBS, Masnada S, Rubboli G, Gardella E, Lesca G, Ville D, Milh M, Villard L, Afenjar A, Chantot-Bastaraud S, Mignot C, Lardennois C, Nava C, Schwarz N, Gérard M, Perrin L, Doummar D, Auvin S, Miranda MJ, Hempel M, Brilstra E, Knoers N, Verbeek N, van Kempen M, Braun KP, Mancini G, Biskup S, Hörtnagel K, Döcker M, Bast T, Loddenkemper T, Wong-Kisiel L, Baumeister FM, Fazeli W, Striano P, Dilena R, Fontana E, Zara F, Kurlemann G, Klepper J, Thoene JG, Arndt DH, Deconinck N, Schmitt-Mechelke T, Maier O, Muhle H, Wical B, Finetti C, Brückner R, Pietz J, Golla G, Jillella D, Linnet KM, Charles P, Moog U, Õiglane-Shlik E, Mantovani JF, Park K, Deprez M, Lederer D, Mary S, Scalais E, Selim L, Van Coster R, Lagae L, Nikanorova M, Hjalgrim H, Korenke GC, Trivisano M, Specchio N, Ceulemans B, Dorn T, Helbig KL, Hardies K, Stamberger H, de Jonghe P, Weckhuysen S, Lemke JR, Krägeloh-Mann I, Helbig I, Kluger G, Lerche H, Møller RS. Genetic and phenotypic heterogeneity suggest therapeutic implications in SCN2A-related disorders. Brain 2017; 140:1316-1336. [DOI: 10.1093/brain/awx054] [Citation(s) in RCA: 311] [Impact Index Per Article: 44.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2016] [Accepted: 01/18/2017] [Indexed: 11/13/2022] Open
Affiliation(s)
- Markus Wolff
- 1 Department of Pediatric Neurology and Developmental Medicine, University Children’s Hospital, Tübingen, Germany
| | - Katrine M. Johannesen
- 2 The Danish Epilepsy Centre, Dianalund, Denmark
- 3 Institute for Regional Health Services, University of Southern Denmark, Odense, Denmark
| | - Ulrike B. S. Hedrich
- 4 Department of Neurology and Epileptology, Hertie Institute for Clinical Brain Research, University of Tübingen, Tübingen, Germany
| | - Silvia Masnada
- 5 Department of Brain and Behavior, University of Pavia, Italy
| | - Guido Rubboli
- 2 The Danish Epilepsy Centre, Dianalund, Denmark
- 6 University of Copenhagen, Copenhagen, Denmark
| | - Elena Gardella
- 2 The Danish Epilepsy Centre, Dianalund, Denmark
- 3 Institute for Regional Health Services, University of Southern Denmark, Odense, Denmark
| | - Gaetan Lesca
- 7 Department of Genetics, Lyon University Hospital, Lyon, France
- 8 Claude Bernard Lyon I University, Lyon, France
- 9 Lyon Neuroscience Research Centre, CNRS UMRS5292, INSERM U1028, Lyon, France
| | - Dorothée Ville
- 10 Department of Pediatric Neurology and Reference Center for Rare Children Epilepsy and Tuberous Sclerosis, Hôpital Femme Mere Enfant, Centre Hospitalier Universitaire de Lyon, HCL, France
| | - Mathieu Milh
- 11 APHM Service de neurologie pédiatrique, Marseille, France
- 12 Aix Marseille Univ, Inserm, GMGF, UMR-S 910, Marseille, France
| | - Laurent Villard
- 12 Aix Marseille Univ, Inserm, GMGF, UMR-S 910, Marseille, France
| | - Alexandra Afenjar
- 13 AP-HP, Unité de Gènètique Clinique, Hôpital Armand Trousseau, Groupe Hospitalier Universitaire de l’Est Parisien, Paris, France
| | - Sandra Chantot-Bastaraud
- 13 AP-HP, Unité de Gènètique Clinique, Hôpital Armand Trousseau, Groupe Hospitalier Universitaire de l’Est Parisien, Paris, France
| | - Cyril Mignot
- 14 AP-HP, Département de Génétique; Centre de Référence Défiences Intellectuelles de Causes Rares; Groupe de Recherche Clinique UPMC “Déficiences Intellectuelles et Autisme” GH Pitié-Salpêtrère, Paris, France
| | - Caroline Lardennois
- 15 Service de Pediatrie neonatale et Réanimation - Neuropediatrie, 76000 Rouen, France
| | - Caroline Nava
- 16 Sorbonne Universités, UPMC Univ Paris 06, UMR S 1127, Inserm U 1127, CNRS UMR 7225, ICM, France
- 17 Department of Genetics, Pitié-Salpêtrière Hospital, AP-HP, F-75013 Paris, France
| | - Niklas Schwarz
- 4 Department of Neurology and Epileptology, Hertie Institute for Clinical Brain Research, University of Tübingen, Tübingen, Germany
| | | | - Laurence Perrin
- 19 Department of Genetics, Robert Debré Hospital, AP-HP, Paris, France
| | - Diane Doummar
- 20 AP-HP, Service de Neuropédiatrie, Hôpital Trousseau, Paris, France
| | - Stéphane Auvin
- 21 Université Paris Diderot, Sorbonne Paris Cité, INSERM UMR1141, Paris, France
- 22 AP-HP, Hôpital Robert Debré, Service de Neurologie Pédiatrique, Paris, France
| | - Maria J. Miranda
- 23 Department of Pediatrics, Herlev University Hospital, Herlev, Denmark
| | - Maja Hempel
- 24 Institute of Human Genetics, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Eva Brilstra
- 25 Department of Genetics, University Medical Center Utrecht, Utrecht, The Netherlands
| | - Nine Knoers
- 25 Department of Genetics, University Medical Center Utrecht, Utrecht, The Netherlands
| | - Nienke Verbeek
- 25 Department of Genetics, University Medical Center Utrecht, Utrecht, The Netherlands
| | - Marjan van Kempen
- 25 Department of Genetics, University Medical Center Utrecht, Utrecht, The Netherlands
| | - Kees P. Braun
- 26 Department of Pediatric Neurology, Brain Center Rudolf Magnus, University Medical Center Utrecht, The Netherlands
| | - Grazia Mancini
- 27 Department of Clinical Genetics, Erasmus University Medical Center, Rotterdam, The Netherlands
| | - Saskia Biskup
- 28 CeGaT - Center for Genomics and Transcriptomics, Tübingen, Germany
| | | | - Miriam Döcker
- 28 CeGaT - Center for Genomics and Transcriptomics, Tübingen, Germany
| | | | - Tobias Loddenkemper
- 30 Division of Epilepsy and Clinical Neurophysiology, Boston Children’s Hospital, Harvard Medical School, Boston MA, USA
| | - Lily Wong-Kisiel
- 31 Division of Child and Adolescent Neurology, Department of Neurology, Mayo Clinic, Rochester MN, USA
| | | | - Walid Fazeli
- 33 Pediatric Neurology, University Hospital Cologne, Germany
| | - Pasquale Striano
- 34 Pediatric Neurology and Muscular Diseases Unit, Department of Neurosciences, Rehabilitation, Ophthalmology, Genetics, and Maternal and Child Health, University of Genoa ‘G. Gaslini’ Institute, Genova, Italy
| | - Robertino Dilena
- 35 Servizio di Epilettologia e Neurofisiopatologia Pediatrica, UO Neurofisiopatologia, Fondazione IRCCS Ca’ Granda Ospedale Maggiore Policlinico, Milano, Italy
| | - Elena Fontana
- 36 Centro di Diagnosi e Cura delle Epilessie Infantili, Azienda Ospedaliera -Policlinico Gianbattista Rossi, Verona, Italy
| | - Federico Zara
- 37 Laboratory of Neurogenetics and Neuroscience, Department of Neuroscience, “G. Gaslini” Institute, Genova, Italy
| | - Gerhard Kurlemann
- 38 Department of Pediatric Neurology, University Children’s Hospital, Münster, Germany
| | - Joerg Klepper
- 39 Children’s Hospital, Klinikum Aschaffenburg, Germany
| | - Jess G. Thoene
- 40 University of Michigan, Pediatric Genetics, Ann Arbor, MI USA
| | - Daniel H. Arndt
- 41 Division of Pediatric Neurology and Epilepsy – Beaumont Children’s Hospital, William Beaumont Oakland University School of Medicine, Royal Oak, Michigan, USA
| | - Nicolas Deconinck
- 42 Department of Neurology, Hôpital Universitaire des Enfants Reine Fabiola, Université Libre de Bruxelles, Brussels, Belgium
| | - Thomas Schmitt-Mechelke
- 43 Children’s Hospital Lucerne, Luzerner Kantonsspital, Kinderspital Luzern, CH-6000 Luzern 16, Switzerland
| | - Oliver Maier
- 44 Department of child neurology, Children’s Hospital, St. Gallen, Switzerland
| | - Hiltrud Muhle
- 45 Department of Neuropediatrics, University Medical Center Schleswig-Holstein, Christian-Albrechts University, Kiel, Germany
| | - Beverly Wical
- 46 Gillette Children’s Specialty Healthcare, Saint Paul, MN, USA
| | - Claudio Finetti
- 47 Klinik für Kinder- und Jugendmedizin, Elisabeth-Krankenhaus, Essen, Germany
| | | | - Joachim Pietz
- 49 Pediatric Practice University Medical Center for Children and Adolescents, Angelika Lautenschläger Children’s Hospital, Heidelberg, Germany
| | - Günther Golla
- 50 Klinik für Kinder- und Jugendmedizin, Klinikum Lippe GmbH, Detmold, Germany
| | - Dinesh Jillella
- 51 Division of Epilepsy and Clinical Neurophysiology, Department of Neurology, Boston Children’s Hospital, Boston, MA, USA
| | - Karen M. Linnet
- 52 Department of Pediatrics, Aarhus University hospital, Aarhus, Denmark
| | - Perrine Charles
- 53 Department of Genetics and Cytogenetics, Assistance Publique-Hôpitaux de Paris, Groupe Hospitalier Pitié-Salpêtrière Charles-Foix, Paris, France
| | - Ute Moog
- 54 Institute of Genetics, University Hospital, Heidelberg, Germany
| | - Eve Õiglane-Shlik
- 55 Children’s Clinic, Institute of Clinical Medicine, University of Tartu, Tartu, Estonia
| | - John F. Mantovani
- 56 Department of Pediatrics and Mercy Kids Autism Center, Mercy Children’s Hospital, St. Louis, Missouri, USA
| | - Kristen Park
- 57 Department of Pediatrics and Neurology, Children’s Hospital Colorado, University of Colorado School of Medicine, Aurora, CO, USA
| | - Marie Deprez
- 58 Centre de Génétique Humaine, Institut de Pathologie et Génétique, Gosselies, Belgium
| | - Damien Lederer
- 58 Centre de Génétique Humaine, Institut de Pathologie et Génétique, Gosselies, Belgium
| | - Sandrine Mary
- 58 Centre de Génétique Humaine, Institut de Pathologie et Génétique, Gosselies, Belgium
| | - Emmanuel Scalais
- 59 Pediatric Neurology Unit, Pediatric Department, Centre Hospitalier de Luxembourg, Luxembourg
| | - Laila Selim
- 60 Department of Pediatrics, Pediatric Neurology and Neurometabolic Unit, Cairo University Children Hospital, Cairo, Egypt
| | - Rudy Van Coster
- 61 Department of Pediatrics, Division of Pediatric Neurology and Metabolism, Ghent University Hospital, Ghent, Belgium
| | - Lieven Lagae
- 62 Department of Development and Regeneration, Section Pediatric Neurology, University Hospital KU Leuven, Leuven, Belgium
| | | | - Helle Hjalgrim
- 2 The Danish Epilepsy Centre, Dianalund, Denmark
- 3 Institute for Regional Health Services, University of Southern Denmark, Odense, Denmark
| | - G. Christoph Korenke
- 63 Zentrum für Kinder- und Jugendmedizin (Elisabeth Kinderkrankenhaus), Klinik für Neuropädiatrie u. Angeborene, Stoffwechselerkrankungen, Oldenburg, Germany
| | - Marina Trivisano
- 64 Neurology Unit, Department of Neuroscience, Bambino Gesù Children’s Hospital, IRCCS, Rome, Italy
| | - Nicola Specchio
- 64 Neurology Unit, Department of Neuroscience, Bambino Gesù Children’s Hospital, IRCCS, Rome, Italy
| | - Berten Ceulemans
- 65 Paediatric Neurology University Hospital and University of Antwerp, Wilrijkstraat 10, 2650 Edegem, Belgium
| | - Thomas Dorn
- 66 Swiss Epilepsy Center, Zurich, Switzerland
| | - Katherine L. Helbig
- 67 Division of Clinical Genomics, Ambry Genetics, Aliso Viejo, California, USA
| | - Katia Hardies
- 68 Neurogenetics Group, Center for Molecular Neurology, VIB, Antwerp, Belgium
- 69 Laboratory of Neurogenetics, Institute Born-Bunge, University of Antwerp, Antwerp, Belgium
| | - Hannah Stamberger
- 68 Neurogenetics Group, Center for Molecular Neurology, VIB, Antwerp, Belgium
- 69 Laboratory of Neurogenetics, Institute Born-Bunge, University of Antwerp, Antwerp, Belgium
- 70 Division of Neurology, University Hospital Antwerp (UZA), Antwerp, Belgium
| | - Peter de Jonghe
- 68 Neurogenetics Group, Center for Molecular Neurology, VIB, Antwerp, Belgium
- 69 Laboratory of Neurogenetics, Institute Born-Bunge, University of Antwerp, Antwerp, Belgium
- 70 Division of Neurology, University Hospital Antwerp (UZA), Antwerp, Belgium
| | - Sarah Weckhuysen
- 68 Neurogenetics Group, Center for Molecular Neurology, VIB, Antwerp, Belgium
- 69 Laboratory of Neurogenetics, Institute Born-Bunge, University of Antwerp, Antwerp, Belgium
- 70 Division of Neurology, University Hospital Antwerp (UZA), Antwerp, Belgium
| | - Johannes R. Lemke
- 71 Institute of Human Genetics, University of Leipzig Hospitals and Clinics, Leipzig, Germany
| | - Ingeborg Krägeloh-Mann
- 1 Department of Pediatric Neurology and Developmental Medicine, University Children’s Hospital, Tübingen, Germany
| | - Ingo Helbig
- 45 Department of Neuropediatrics, University Medical Center Schleswig-Holstein, Christian-Albrechts University, Kiel, Germany
- 72 Division of Neurology, The Children’s Hospital of Philadelphia, Philadelphia, USA
| | - Gerhard Kluger
- 73 Neuropediatric Clinic and Clinic for Neurorehabilitation, Epilepsy Center for Children and Adolescents, Schoen Klinik, Vogtareuth, Germany
- 74 PMU Salzburg, Austria
| | - Holger Lerche
- 4 Department of Neurology and Epileptology, Hertie Institute for Clinical Brain Research, University of Tübingen, Tübingen, Germany
| | - Rikke S Møller
- 2 The Danish Epilepsy Centre, Dianalund, Denmark
- 3 Institute for Regional Health Services, University of Southern Denmark, Odense, Denmark
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Affiliation(s)
- Pavel Popovich
- Centre de Recherches en Physique des Plasmas, Association EURATOM–Conf×d×ration Suisse EPFL, 1015 Lausanne, Switzerland
| | - W. Anthony Cooper
- Centre de Recherches en Physique des Plasmas, Association EURATOM–Conf×d×ration Suisse EPFL, 1015 Lausanne, Switzerland
| | - Laurent Villard
- Centre de Recherches en Physique des Plasmas, Association EURATOM–Conf×d×ration Suisse EPFL, 1015 Lausanne, Switzerland
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Matagne V, Ehinger Y, Saidi L, Borges-Correia A, Barkats M, Bartoli M, Villard L, Roux JC. A codon-optimized Mecp2 transgene corrects breathing deficits and improves survival in a mouse model of Rett syndrome. Neurobiol Dis 2016; 99:1-11. [PMID: 27974239 DOI: 10.1016/j.nbd.2016.12.009] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2016] [Revised: 11/07/2016] [Accepted: 12/09/2016] [Indexed: 11/15/2022] Open
Abstract
Rett syndrome (RTT) is a severe X-linked neurodevelopmental disorder that is primarily caused by mutations in the methyl CpG binding protein 2 gene (MECP2). RTT is the second most prevalent cause of intellectual disability in girls and there is currently no cure for the disease. The finding that the deficits caused by the loss of Mecp2 are reversible in the mouse has bolstered interest in gene therapy as a cure for RTT. In order to assess the feasibility of gene therapy in a RTT mouse model, and in keeping with translational goals, we investigated the efficacy of a self-complementary AAV9 vector expressing a codon-optimized version of Mecp2 (AAV9-MCO) delivered via a systemic approach in early symptomatic Mecp2-deficient (KO) mice. Our results show that AAV9-MCO administered at a dose of 2×1011 viral genome (vg)/mouse was able to significantly increase survival and weight gain, and delay the occurrence of behavioral deficits. Apneas, which are one of the core RTT breathing deficits, were significantly decreased to WT levels in Mecp2 KO mice after AAV9-MCO administration. Semi-quantitative analysis showed that AAV9-MCO administration in Mecp2 KO mice resulted in 10 to 20% Mecp2 immunopositive cells compared to WT animals, with the highest Mecp2 expression found in midbrain regions known to regulate cardio-respiratory functions. In addition, we also found a cell autonomous increase in tyrosine hydroxylase levels in the A1C1 and A2C2 catecholaminergic Mecp2+ neurons in treated Mecp2 KO mice, which may partly explain the beneficial effect of AAV9-MCO administration on apneas occurrence.
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Affiliation(s)
- Valerie Matagne
- Aix Marseille Univ, INSERM, GMGF, UMR_S 910, 13385 Marseille, France
| | - Yann Ehinger
- Aix Marseille Univ, INSERM, GMGF, UMR_S 910, 13385 Marseille, France
| | - Lydia Saidi
- Aix Marseille Univ, INSERM, GMGF, UMR_S 910, 13385 Marseille, France
| | | | - Martine Barkats
- Center of Research on Myology, FRE 3617 Centre National de la Recherche Scientifique, UMRS 974 INSERM, French Institute of Myology, Pierre and Marie Curie University Paris, France
| | - Marc Bartoli
- Aix Marseille Univ, INSERM, GMGF, UMR_S 910, 13385 Marseille, France
| | - Laurent Villard
- Aix Marseille Univ, INSERM, GMGF, UMR_S 910, 13385 Marseille, France
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Goldenberg A, Riccardi F, Tessier A, Pfundt R, Busa T, Cacciagli P, Capri Y, Coutton C, Delahaye-Duriez A, Frebourg T, Gatinois V, Guerrot AM, Genevieve D, Lecoquierre F, Jacquette A, Khau Van Kien P, Leheup B, Marlin S, Verloes A, Michaud V, Nadeau G, Mignot C, Parent P, Rossi M, Toutain A, Schaefer E, Thauvin-Robinet C, Van Maldergem L, Thevenon J, Satre V, Perrin L, Vincent-Delorme C, Sorlin A, Missirian C, Villard L, Mancini J, Saugier-Veber P, Philip N. Clinical and molecular findings in 39 patients with KBG syndrome caused by deletion or mutation of ANKRD11. Am J Med Genet A 2016; 170:2847-2859. [PMID: 27605097 DOI: 10.1002/ajmg.a.37878] [Citation(s) in RCA: 52] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2016] [Accepted: 07/19/2016] [Indexed: 12/28/2022]
Abstract
KBG syndrome, due to ANKRD11 alteration is characterized by developmental delay, short stature, dysmorphic facial features, and skeletal anomalies. We report a clinical and molecular study of 39 patients affected by KBG syndrome. Among them, 19 were diagnosed after the detection of a 16q24.3 deletion encompassing the ANKRD11 gene by array CGH. In the 20 remaining patients, the clinical suspicion was confirmed by the identification of an ANKRD11 mutation by direct sequencing. We present arguments to modulate the previously reported diagnostic criteria. Macrodontia should no longer be considered a mandatory feature. KBG syndrome is compatible with autonomous life in adulthood. Autism is less frequent than previously reported. We also describe new clinical findings with a potential impact on the follow-up of patients, such as precocious puberty and a case of malignancy. Most deletions remove the 5'end or the entire coding region but never extend toward 16q telomere suggesting that distal 16q deletion could be lethal. Although ANKRD11 appears to be a major gene associated with intellectual disability, KBG syndrome remains under-diagnosed. NGS-based approaches for sequencing will improve the detection of point mutations in this gene. Broad knowledge of the clinical phenotype is essential for a correct interpretation of the molecular results. © 2016 Wiley Periodicals, Inc.
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Affiliation(s)
- Alice Goldenberg
- Service de génétique, CHU de Rouen et Inserm U1079, Université de Rouen, Centre Normand de Génomique Médicale et Médecine Personnalisée, Rouen, France.
| | - Florence Riccardi
- Département de génétique médicale, Hôpital de la Timone-Enfant, Assistance publique hôpitaux de Marseille, Marseille, France
| | - Aude Tessier
- Service de génétique, CHU de Rouen et Inserm U1079, Université de Rouen, Centre Normand de Génomique Médicale et Médecine Personnalisée, Rouen, France
| | - Rolph Pfundt
- Afdeling Genetica, Radboud universitair medisch centrum, Nijmegen, Holland
| | - Tiffany Busa
- Département de génétique médicale, Hôpital de la Timone-Enfant, Assistance publique hôpitaux de Marseille, Marseille, France
| | | | - Yline Capri
- Unité fonctionnelle de génétique clinique, CHU Robert Debré, Paris, France
| | - Charles Coutton
- Unité fonctionnelle de génétique chromosomique, Hôpital Couple-Enfant, CHU de Grenoble, Université de Grenoble Alpes, INSERM 1209, CNRS UMR 5309, Grenoble, France
| | - Andree Delahaye-Duriez
- Laboratoire d'histologie-embryologie-cytogénétique-BDR, Hôpital Jean Verdier, CHU de Paris Seine-Saint-Denis, APHP et Université Paris 13, Sorbonne Paris Cité, Bondy, France
| | - Thierry Frebourg
- Service de génétique, CHU de Rouen et Inserm U1079, Université de Rouen, Centre Normand de Génomique Médicale et Médecine Personnalisée, Rouen, France
| | - Vincent Gatinois
- Laboratoire de génétique des maladies rares et auto-inflammatoires, Hôpital Arnaud de Villeneuve, CHRU de Montpellier, Montpellier, France
| | - Anne-Marie Guerrot
- Service de génétique, CHU de Rouen et Inserm U1079, Université de Rouen, Centre Normand de Génomique Médicale et Médecine Personnalisée, Rouen, France
| | - David Genevieve
- Département de génétique médicale, Hôpital Arnaud de Villeneuve, CHRU de Montpellier, Montpellier, France
| | - Francois Lecoquierre
- Service de génétique, CHU de Rouen et Inserm U1079, Université de Rouen, Centre Normand de Génomique Médicale et Médecine Personnalisée, Rouen, France
| | - Aurélia Jacquette
- APHP, Département de Génétique, Centre de référence déficiences intellectuelles de Causes Rares, GRC UPMC "déficiences intellectuelles et autisme", Groupe Hospitalier Pitié Salpêtrière, Paris, France
| | - Philippe Khau Van Kien
- Unité fonctionnelle de génétique médicale et cytogénétique, Hôpital Caremeau, CHU de Nîmes, Nîmes, France
| | - Bruno Leheup
- Service de génétique clinique, Hôpital de Brabois, CHU de Nancy, Nancy, France
| | - Sandrine Marlin
- Service de génétique, Hôpital Necker-Enfants Malades, Paris, France
| | - Alain Verloes
- Unité fonctionnelle de génétique clinique, CHU Robert Debré, Paris, France
| | - Vincent Michaud
- Service de génétique médicale, GH Pellegrin, CHU de Bordeaux, Bordeaux, France
| | - Gwenael Nadeau
- Unité fonctionnelle de cytogénétique, CH de Valence, Valence, France
| | - Cyril Mignot
- APHP, Département de Génétique, Centre de référence déficiences intellectuelles de Causes Rares, GRC UPMC "déficiences intellectuelles et autisme", Groupe Hospitalier Pitié Salpêtrière, Paris, France
| | - Philippe Parent
- Département de pédiatrie et génétique médicale, Hôpital Morvan, CHRU de Brest, Brest, France
| | - Massimiliano Rossi
- Service de génétique, Hôpital Femme-Mère-Enfant, GH Est, CHU de Lyon, Lyon, France
| | - Annick Toutain
- Service de génétique, Hôpital Bretonneau, CHRU de Tours, Tours, France
| | - Elise Schaefer
- Service de génétique médicale, Hôpital de Hautepierre, CHU de Strasbourg, Strasbourg, France
| | | | - Lionel Van Maldergem
- Centre de génétique humaine, Hôpital Saint-Jacques, CHRU de Besançon, Besançon, France
| | - Julien Thevenon
- Centre de génétique, Hôpital François Mitterrand, CHU Dijon Bourgogne, Dijon, France
| | - Véronique Satre
- Unité fonctionnelle de génétique chromosomique, Hôpital Couple-Enfant, CHU de Grenoble, Université de Grenoble Alpes, INSERM 1209, CNRS UMR 5309, Grenoble, France
| | - Laurence Perrin
- Unité fonctionnelle de génétique clinique, CHU Robert Debré, Paris, France
| | | | - Arthur Sorlin
- Service de génétique clinique, Hôpital de Brabois, CHU de Nancy, Nancy, France
| | - Chantal Missirian
- Département de génétique médicale, Hôpital de la Timone-Enfant, Assistance publique hôpitaux de Marseille, Marseille, France
| | | | - Julien Mancini
- Aix Marseille Université, Inserm, IRD, UMR_S912, SESSTIM, Marseille, France.,APHM, Hôpital de la Timone, BiosTIC, Marseille, France
| | - Pascale Saugier-Veber
- Service de génétique, CHU de Rouen et Inserm U1079, Université de Rouen, Centre Normand de Génomique Médicale et Médecine Personnalisée, Rouen, France
| | - Nicole Philip
- Département de génétique médicale, Hôpital de la Timone-Enfant, Assistance publique hôpitaux de Marseille, Marseille, France.,Aix Marseille Université, INSERM, GMGF, Marseille, France
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Devaux J, Abidi A, Roubertie A, Molinari F, Becq H, Lacoste C, Villard L, Milh M, Aniksztejn L. A Kv7.2 mutation associated with early onset epileptic encephalopathy with suppression-burst enhances Kv7/M channel activity. Epilepsia 2016; 57:e87-93. [PMID: 27030113 DOI: 10.1111/epi.13366] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 02/25/2016] [Indexed: 02/04/2023]
Abstract
Mutations in the KCNQ2 gene encoding the voltage-gated potassium channel subunit Kv7.2 cause early onset epileptic encephalopathy (EOEE). Most mutations have been shown to induce a loss of function or to affect the subcellular distribution of Kv7 channels in neurons. Herein, we investigated functional consequences and subcellular distribution of the p.V175L mutation of Kv7.2 (Kv7.2(V175L) ) found in a patient presenting EOEE. We observed that the mutation produced a 25-40 mV hyperpolarizing shift of the conductance-voltage relationship of both the homomeric Kv7.2(V175L) and heteromeric Kv7.2(V175L) /Kv7.3 channels compared to wild-type channels and a 10 mV hyperpolarizing shift of Kv7.2(V175L) /Kv7.2/Kv7.3 channels in a 1:1:2 ratio mimicking the patient situation. Mutant channels also displayed faster activation kinetics and an increased current density that was prevented by 1 μm linopirdine. The p.V175L mutation did not affect the protein expression of Kv7 channels and its localization at the axon initial segment. We conclude that p.V175L is a gain of function mutation. This confirms previous observations showing that mutations having opposite consequences on M channels can produce EOEE. These findings alert us that drugs aiming to increase Kv7 channel activity might have adverse effects in EOEE in the case of gain-of-function variants.
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Affiliation(s)
- Jérôme Devaux
- CNRS, Aix-Marseille University, CRN2M-UMR7286, Marseille, France
| | - Affef Abidi
- GMGF, Aix-Marseille University, Marseille, France.,INSERM, UMR_S 910, Marseille, France
| | - Agathe Roubertie
- Pediatric Neurology Department, Montpellier University Hospital, Montpellier, France.,INSERM U1051, INM Montpellier, Montpellier, France
| | - Florence Molinari
- Mediterranean Neurobiology Institute INMED, Aix-Marseille University, Marseille, France.,INSERM, UMR_S 901, Marseille, France
| | - Hélène Becq
- Mediterranean Neurobiology Institute INMED, Aix-Marseille University, Marseille, France.,INSERM, UMR_S 901, Marseille, France
| | - Caroline Lacoste
- GMGF, Aix-Marseille University, Marseille, France.,INSERM, UMR_S 910, Marseille, France.,Timone Children Hospital, Pediatric Neurology Department, APHM, Marseille, France
| | - Laurent Villard
- GMGF, Aix-Marseille University, Marseille, France.,INSERM, UMR_S 910, Marseille, France
| | - Mathieu Milh
- GMGF, Aix-Marseille University, Marseille, France.,INSERM, UMR_S 910, Marseille, France.,Timone Children Hospital, Pediatric Neurology Department, APHM, Marseille, France
| | - Laurent Aniksztejn
- Mediterranean Neurobiology Institute INMED, Aix-Marseille University, Marseille, France.,INSERM, UMR_S 901, Marseille, France
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Milh M, Cacciagli P, Ravix C, Badens C, Lépine A, Villeneuve N, Villard L. Severe neonatal seizures: From molecular diagnosis to precision therapy? Rev Neurol (Paris) 2016; 172:171-3. [DOI: 10.1016/j.neurol.2016.02.005] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2015] [Revised: 02/16/2016] [Accepted: 02/23/2016] [Indexed: 12/18/2022]
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Di Meglio C, Lesca G, Villeneuve N, Lacoste C, Abidi A, Cacciagli P, Altuzarra C, Roubertie A, Afenjar A, Renaldo-Robin F, Isidor B, Gautier A, Husson M, Cances C, Metreau J, Laroche C, Chouchane M, Ville D, Marignier S, Rougeot C, Lebrun M, de Saint Martin A, Perez A, Riquet A, Badens C, Missirian C, Philip N, Chabrol B, Villard L, Milh M. Epileptic patients with de novo STXBP1 mutations: Key clinical features based on 24 cases. Epilepsia 2015; 56:1931-40. [PMID: 26514728 DOI: 10.1111/epi.13214] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 09/11/2015] [Indexed: 01/23/2023]
Abstract
OBJECTIVE Mutations in the syntaxin binding protein 1 gene (STXBP1) have been associated mostly with early onset epileptic encephalopathies (EOEEs) and Ohtahara syndrome, with a mutation detection rate of approximately 10%, depending on the criteria of selection of patients. The aim of this study was to retrospectively describe clinical and electroencephalography (EEG) features associated with STXBP1-related epilepsies to orient molecular screening. METHODS We screened STXBP1 in a cohort of 284 patients with epilepsy associated with a developmental delay/intellectual disability and brain magnetic resonance imaging (MRI) without any obvious structural abnormality. We reported on patients with a mutation and a microdeletion involving STXBP1 found using array comparative genomic hybridization (CGH). RESULTS We found a mutation of STXBP1 in 22 patients and included 2 additional patients with a deletion including STXBP1. In 22 of them, epilepsy onset was before 3 months of age. EEG at onset was abnormal in all patients, suppression-burst and multifocal abnormalities being the most common patterns. The rate of patients carrying a mutation ranged from 25% in Ohtahara syndrome to <5% in patients with an epilepsy beginning after 3 months of age. Epilepsy improved over time for most patients, with an evolution to West syndrome in half. Patients had moderate to severe developmental delay with normal head growth. Cerebellar syndrome with ataxic gait and/or tremor was present in 60%. SIGNIFICANCE Our data confirm that STXBP1 mutations are associated with neonatal-infantile epileptic encephalopathies. The initial key features highlighted in the cohort of early epileptic patients are motor seizures either focal or generalized, abnormal initial interictal EEG, and normal head growth. In addition, we constantly found an ongoing moderate to severe developmental delay with normal head growth. Patients often had ongoing ataxic gait with trembling gestures. Altogether these features should help the clinician to consider STXBP1 molecular screening.
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Affiliation(s)
- Chloé Di Meglio
- Pediatric Neurology Department, Timone Children Hospital, Marseille, France
| | - Gaetan Lesca
- INSERM, U1028, CNRS, UMR5292, Laboratory of Molecular Genetics, Lyon, France
| | | | - Caroline Lacoste
- Aix Marseille University, INSERM, UMR_S 910, Marseille, France.,Medical Genetics Department, Timone Children Hospital, Marseille, France.,Aix Marseille University, GMGF, Marseille, France
| | - Affef Abidi
- Aix Marseille University, INSERM, UMR_S 910, Marseille, France.,Aix Marseille University, GMGF, Marseille, France
| | - Pierre Cacciagli
- Aix Marseille University, INSERM, UMR_S 910, Marseille, France.,Medical Genetics Department, Timone Children Hospital, Marseille, France.,Aix Marseille University, GMGF, Marseille, France
| | | | - Agathe Roubertie
- Pediatric Neurology Department, Montpellier University Hospital, Montpellier, France.,Institute for Neurosciences of Montpellier (INM), INSERM U 1051, Montpellier, France
| | - Alexandra Afenjar
- Pediatric Neurology Department, Trousseau Hospital, AP-HP, Paris, France
| | | | - Bertrand Isidor
- Medical Genetics Department, Nantes University Hospital, Nantes, France
| | - Agnes Gautier
- Department of Pediatrics, Nantes University Hospital, Nantes, France
| | - Marie Husson
- Pediatric Neurology Department, Bordeaux University Hospital, Bordeaux, France
| | - Claude Cances
- Pediatric Neurology Department, Toulouse University Hospital, Toulouse, France
| | - Julia Metreau
- Pediatric Neurology Department, Bicêtre Hospital, Kremlin-Bicêtre, France
| | - Cécile Laroche
- Department of Pediatrics, Limoges University Hospital, Limoges, France
| | | | - Dorothée Ville
- Pediatric Neurology Department, Lyon University Hospital, Bron, France
| | | | | | - Marine Lebrun
- Medical Genetics Department, St Etienne University Hospital, Saint Priez en Jarez, France
| | - Anne de Saint Martin
- Pediatric Neurology Department, Hautepierre Hospital, Strasbourg University Hospital, Strasbourg, France
| | - Alexandra Perez
- Pediatric Intensive Cares Unit, Hautepierre Hospital, Strasbourg University Hospital, Strasbourg, France
| | - Audrey Riquet
- Pediatric Neurology Department, Lille University Hospital, Lille, France
| | - Catherine Badens
- Aix Marseille University, INSERM, UMR_S 910, Marseille, France.,Medical Genetics Department, Timone Children Hospital, Marseille, France.,Aix Marseille University, GMGF, Marseille, France
| | - Chantal Missirian
- Medical Genetics Department, Timone Children Hospital, Marseille, France
| | - Nicole Philip
- Aix Marseille University, INSERM, UMR_S 910, Marseille, France.,Medical Genetics Department, Timone Children Hospital, Marseille, France.,Aix Marseille University, GMGF, Marseille, France
| | - Brigitte Chabrol
- Pediatric Neurology Department, Timone Children Hospital, Marseille, France
| | - Laurent Villard
- Aix Marseille University, INSERM, UMR_S 910, Marseille, France.,Aix Marseille University, GMGF, Marseille, France
| | - Mathieu Milh
- Pediatric Neurology Department, Timone Children Hospital, Marseille, France.,Aix Marseille University, INSERM, UMR_S 910, Marseille, France.,Aix Marseille University, GMGF, Marseille, France
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Doummar D, Mignot C, Apartis E, Villard L, Rodriguez D, Chantot-Bastauraud S, Burglen L. A Novel Homozygous TBC1D24 Mutation Causing Multifocal Myoclonus With Cerebellar Involvement. Mov Disord 2015. [PMID: 26207815 DOI: 10.1002/mds.26303] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
Affiliation(s)
- Diane Doummar
- AP-HP, Service de Neuropédiatrie, Hôpital Trousseau, Paris, France.,Centre de Référence Neurogénétique de l'Enfant à l'adulte, Hôpital Trousseau, Paris, France.,Centre de Référence Malformations et Maladies Congénitales du Cervelet, Hôpital Trousseau, Paris, France
| | - Cyril Mignot
- AP-HP, Département de Génétique, Groupe Hospitalier Pitié-Salpêtrière, and Centre de Référence déficiences intellectuelles de causes rares, Paris, France
| | - Emmanuelle Apartis
- AP-HP, Unité de Neurophysiologie, Hôpital Saint-Antoine, Paris, France.,ICM INSERM, UMRS 975, et CNRS 7225-CRICM, Hôpital Pitié-Salpêtrière, Paris, France.,Université Pierre et Marie Curie-Paris-6, Paris, France
| | - Laurent Villard
- Aix-Marseille Université, Inserm, GMGF, UMR_S910, Marseille, France
| | - Diana Rodriguez
- AP-HP, Service de Neuropédiatrie, Hôpital Trousseau, Paris, France.,Centre de Référence Neurogénétique de l'Enfant à l'adulte, Hôpital Trousseau, Paris, France.,Centre de Référence Malformations et Maladies Congénitales du Cervelet, Hôpital Trousseau, Paris, France.,Université Pierre et Marie Curie-Paris-6, Paris, France.,Inserm U1141, Paris, France
| | | | - Lydie Burglen
- Centre de Référence Malformations et Maladies Congénitales du Cervelet, Hôpital Trousseau, Paris, France.,Inserm U1141, Paris, France.,AP-HP, Service de Génétique et d'Embryologie Médicale, Hôpital Armand Trousseau, Paris, France
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Abidi A, Mignon-Ravix C, Cacciagli P, Girard N, Milh M, Villard L. Early-onset epileptic encephalopathy as the initial clinical presentation of WDR45 deletion in a male patient. Eur J Hum Genet 2015; 24:615-8. [PMID: 26173968 DOI: 10.1038/ejhg.2015.159] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2015] [Revised: 05/27/2015] [Accepted: 06/11/2015] [Indexed: 01/05/2023] Open
Abstract
Variants in the WD repeat 45 (WDR45) gene in human Xp11.23 have recently been identified in patients suffering from neurodegeneration with brain iron accumulation, a genetically and phenotypically heterogeneous condition. WDR45 variants cause a childhood-onset encephalopathy accompanied by neurodegeneration in adulthood and iron accumulation in the basal ganglia. They have been almost exclusively found in females, and male lethality was suggested. Here we describe a male patient suffering from a severe and early neurological phenotype, initially presenting early-onset epileptic spasms in clusters associated with an abnormal interictal electroencephalography showing slow background activity, large amplitude asynchronous spikes and abnormal neurological development. This patient is a carrier of a 19.9-kb microdeletion in Xp11.23 containing three genes, including WDR45. These findings reveal that males with WDR45 deletions are viable, and can present with early-onset epileptic encephalopathy without brain iron accumulation.
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Affiliation(s)
- Affef Abidi
- Inserm, UMR_S 910, Faculté de Médecine de La Timone, Marseille, France.,Aix Marseille Université, GMGF, Marseille, France
| | - Cécile Mignon-Ravix
- Inserm, UMR_S 910, Faculté de Médecine de La Timone, Marseille, France.,Aix Marseille Université, GMGF, Marseille, France
| | - Pierre Cacciagli
- Inserm, UMR_S 910, Faculté de Médecine de La Timone, Marseille, France.,Aix Marseille Université, GMGF, Marseille, France.,Département de Génétique Médicale, Hôpital d'Enfants de La Timone, Marseille, France
| | - Nadine Girard
- Département de Neuroradiologie, Hôpital d'Adultes de La Timone, Marseille, France
| | - Mathieu Milh
- Inserm, UMR_S 910, Faculté de Médecine de La Timone, Marseille, France.,Aix Marseille Université, GMGF, Marseille, France.,Service de Neurologie Pédiatrique, Hôpital d'Enfants de La Timone, Marseille, France
| | - Laurent Villard
- Inserm, UMR_S 910, Faculté de Médecine de La Timone, Marseille, France.,Aix Marseille Université, GMGF, Marseille, France
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Choucair N, Mignon-Ravix C, Cacciagli P, Abou Ghoch J, Fawaz A, Mégarbané A, Villard L, Chouery E. Evidence that homozygous PTPRD gene microdeletion causes trigonocephaly, hearing loss, and intellectual disability. Mol Cytogenet 2015; 8:39. [PMID: 26082802 PMCID: PMC4469107 DOI: 10.1186/s13039-015-0149-0] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2015] [Accepted: 06/04/2015] [Indexed: 12/03/2022] Open
Abstract
Background The premature fusion of metopic sutures results in the clinical phenotype of trigonocephaly. An association of this characteristic with the monosomy 9p syndrome is well established and the receptor-type protein tyrosine phosphatase gene (PTPRD), located in the 9p24.1p23 region and encoding a major component of the excitatory and inhibitory synaptic organization, is considered as a good candidate to be responsible for this form of craniosynostosis. Moreover PTPRD is known to recruit multiple postsynaptic partners such as IL1RAPL1 which gene alterations lead to non syndromic intellectual disability (ID). Results We describe a 30 month old boy with severe intellectual disability, trigonocephaly and dysmorphic facial features such as a midface hypoplasia, a flat nose, a depressed nasal bridge, hypertelorism, a long philtrum and a drooping mouth. Microarray chromosomal analysis revealed the presence of a homozygous deletion involving the PTPRD gene, located on chromosome 9p22.3. Reverse Transcription PCR (RT-PCR) amplifications all along the gene failed to amplify the patient's cDNA in fibroblasts, indicating the presence of two null PTPRD alleles. Synaptic PTPRD interacts with IL1RAPL1 which defects have been associated with intellectual disability (ID) and autism spectrum disorder. The absence of the PTPRD transcript leads to a decrease in the expression of IL1RAPL1. These results suggest the direct involvement of PTPRD in ID, which is consistent with the PTPRD -/- mice phenotype. Deletions of PTPRD have been previously suggested as a cause of trigonocephaly in patients with monosomy 9p and genome-wide association study suggested variations in PTPRD are associated with hearing loss. Conclusions The deletion identified in the reported patient supports previous hypotheses on its function in ID and hearing loss. However, its involvement in the occurrence of metopic synostosis is still to be discussed as more investigation of patients with the 9p monosomy syndrome is required.
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Affiliation(s)
- Nancy Choucair
- Unité de Génétique Médicale et Laboratoire Associé INSERM à l'Unité UMR_S 910, Faculté de Médecine, Université Saint-Joseph, rue de Damas B.P. 17-5208 Mar Mikhael, Beyrouth, 11042020 Lebanon ; Aix-Marseille Université, GMGF, Marseille, France ; INSERM, UMR_S 910, Marseille, France
| | - Cecile Mignon-Ravix
- Aix-Marseille Université, GMGF, Marseille, France ; INSERM, UMR_S 910, Marseille, France
| | - Pierre Cacciagli
- Aix-Marseille Université, GMGF, Marseille, France ; INSERM, UMR_S 910, Marseille, France ; Département de Génétique Médicale, Assitance Publique Hôpitaux de Marseille, Hôpital d'Enfants de La Timone, Marseille, France
| | - Joelle Abou Ghoch
- Unité de Génétique Médicale et Laboratoire Associé INSERM à l'Unité UMR_S 910, Faculté de Médecine, Université Saint-Joseph, rue de Damas B.P. 17-5208 Mar Mikhael, Beyrouth, 11042020 Lebanon
| | - Ali Fawaz
- Neuropediatrics Department, Lebanese University, Beirut, Lebanon
| | - André Mégarbané
- Unité de Génétique Médicale et Laboratoire Associé INSERM à l'Unité UMR_S 910, Faculté de Médecine, Université Saint-Joseph, rue de Damas B.P. 17-5208 Mar Mikhael, Beyrouth, 11042020 Lebanon ; Institut Jérôme Lejeune, Paris, France
| | - Laurent Villard
- Aix-Marseille Université, GMGF, Marseille, France ; INSERM, UMR_S 910, Marseille, France
| | - Eliane Chouery
- Unité de Génétique Médicale et Laboratoire Associé INSERM à l'Unité UMR_S 910, Faculté de Médecine, Université Saint-Joseph, rue de Damas B.P. 17-5208 Mar Mikhael, Beyrouth, 11042020 Lebanon
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Abidi A, Devaux JJ, Molinari F, Alcaraz G, Michon FX, Sutera-Sardo J, Becq H, Lacoste C, Altuzarra C, Afenjar A, Mignot C, Doummar D, Isidor B, Guyen SN, Colin E, De La Vaissière S, Haye D, Trauffler A, Badens C, Prieur F, Lesca G, Villard L, Milh M, Aniksztejn L. A recurrent KCNQ2 pore mutation causing early onset epileptic encephalopathy has a moderate effect on M current but alters subcellular localization of Kv7 channels. Neurobiol Dis 2015; 80:80-92. [PMID: 26007637 DOI: 10.1016/j.nbd.2015.04.017] [Citation(s) in RCA: 53] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2014] [Revised: 03/28/2015] [Accepted: 04/15/2015] [Indexed: 01/28/2023] Open
Abstract
Mutations in the KCNQ2 gene encoding the voltage-dependent potassium M channel Kv7.2 subunit cause either benign epilepsy or early onset epileptic encephalopathy (EOEE). It has been proposed that the disease severity rests on the inhibitory impact of mutations on M current density. Here, we have analyzed the phenotype of 7 patients carrying the p.A294V mutation located on the S6 segment of the Kv7.2 pore domain (Kv7.2(A294V)). We investigated the functional and subcellular consequences of this mutation and compared it to another mutation (Kv7.2(A294G)) associated with a benign epilepsy and affecting the same residue. We report that all the patients carrying the p.A294V mutation presented the clinical and EEG characteristics of EOEE. In CHO cells, the total expression of Kv7.2(A294V) alone, assessed by western blotting, was only 20% compared to wild-type. No measurable current was recorded in CHO cells expressing Kv7.2(A294V) channel alone. Although the total Kv7.2(A294V) expression was rescued to wild-type levels in cells co-expressing the Kv7.3 subunit, the global current density was still reduced by 83% compared to wild-type heteromeric channel. In a configuration mimicking the patients' heterozygous genotype i.e., Kv7.2(A294V)/Kv7.2/Kv7.3, the global current density was reduced by 30%. In contrast to Kv7.2(A294V), the current density of homomeric Kv7.2(A294G) was not significantly changed compared to wild-type Kv7.2. However, the current density of Kv7.2(A294G)/Kv7.2/Kv7.3 and Kv7.2(A294G)/Kv7.3 channels were reduced by 30% and 50% respectively, compared to wild-type Kv7.2/Kv7.3. In neurons, the p.A294V mutation induced a mislocalization of heteromeric mutant channels to the somato-dendritic compartment, while the p.A294G mutation did not affect the localization of the heteromeric channels to the axon initial segment. We conclude that this position is a hotspot of mutation that can give rise to a severe or a benign epilepsy. The p.A294V mutation does not exert a dominant-negative effect on wild-type subunits but alters the preferential axonal targeting of heteromeric Kv7 channels. Our data suggest that the disease severity is not necessarily a consequence of a strong inhibition of M current and that additional mechanisms such as abnormal subcellular distribution of Kv7 channels could be determinant.
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Affiliation(s)
- Affef Abidi
- Aix-Marseille Université, GMGF, Marseille, France; INSERM, UMR_S 910, Marseille, France
| | - Jérôme J Devaux
- Aix-Marseille Université, CNRS, CRN2M-UMR7286, Marseille, France
| | - Florence Molinari
- Aix-Marseille Université, Institut de Neurobiologie de la Méditerranée (INMED), Marseille, France; INSERM, UMR_S 901, Marseille, France
| | - Gisèle Alcaraz
- Aix-Marseille Université, GMGF, Marseille, France; INSERM, UMR_S 910, Marseille, France
| | - François-Xavier Michon
- Aix-Marseille Université, Institut de Neurobiologie de la Méditerranée (INMED), Marseille, France; INSERM, UMR_S 901, Marseille, France
| | - Julie Sutera-Sardo
- Aix-Marseille Université, GMGF, Marseille, France; INSERM, UMR_S 910, Marseille, France; APHM, Hôpital d'Enfants de la Timone, Service de neurologie pédiatrique, Marseille, France
| | - Hélène Becq
- Aix-Marseille Université, Institut de Neurobiologie de la Méditerranée (INMED), Marseille, France; INSERM, UMR_S 901, Marseille, France
| | - Caroline Lacoste
- Aix-Marseille Université, GMGF, Marseille, France; INSERM, UMR_S 910, Marseille, France; APHM, Hôpital d'enfants de la Timone, Département de génétique médicale et de biologie cellulaire, Marseille France
| | - Cécilia Altuzarra
- CHU Besançon, Service de génétique et neuropédiatrie, Besançon, France
| | - Alexandra Afenjar
- Université Pierre et Marie Curie, Groupe de Recherche Clinique « Déficiences Intellectuelles de Causes Rares », Paris, France; APHP, service de neurologie pédiatrique, Hôpital Trousseau, Paris, France
| | - Cyril Mignot
- APHP, Service de Génétique Médicale et Centre de Références « Déficiences Intellectuelles de Causes Rares », Groupe Hospitalier Pitié-Salpêtrière, Paris, France; Université Pierre et Marie Curie, Groupe de Recherche Clinique « Déficiences Intellectuelles de Causes Rares », Paris, France
| | - Diane Doummar
- APHP, service de neurologie pédiatrique, Hôpital Trousseau, Paris, France
| | - Bertrand Isidor
- CHU de Nantes, Service de génétique médicale, Nantes, France
| | - Sylvie N Guyen
- CHU d'Angers, Service de neurologie pédiatrique, Angers, France
| | - Estelle Colin
- CHU d'Angers, Département de Biochimie et Génétique, Angers, France
| | | | - Damien Haye
- CHU de Tours, Service de génétique, Tours, France
| | | | - Catherine Badens
- Aix-Marseille Université, GMGF, Marseille, France; INSERM, UMR_S 910, Marseille, France; APHM, Hôpital d'enfants de la Timone, Département de génétique médicale et de biologie cellulaire, Marseille France
| | | | - Gaetan Lesca
- Hospices Civils de Lyon, Service de génétique, Lyon, France
| | - Laurent Villard
- Aix-Marseille Université, GMGF, Marseille, France; INSERM, UMR_S 910, Marseille, France
| | - Mathieu Milh
- Aix-Marseille Université, GMGF, Marseille, France; INSERM, UMR_S 910, Marseille, France; APHM, Hôpital d'Enfants de la Timone, Service de neurologie pédiatrique, Marseille, France.
| | - Laurent Aniksztejn
- Aix-Marseille Université, Institut de Neurobiologie de la Méditerranée (INMED), Marseille, France; INSERM, UMR_S 901, Marseille, France.
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Milh M, Lacoste C, Cacciagli P, Abidi A, Sutera-Sardo J, Tzelepis I, Colin E, Badens C, Afenjar A, Coeslier AD, Dailland T, Lesca G, Philip N, Villard L. Variable clinical expression in patients with mosaicism for KCNQ2
mutations. Am J Med Genet A 2015; 167A:2314-8. [DOI: 10.1002/ajmg.a.37152] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2015] [Accepted: 04/09/2015] [Indexed: 11/06/2022]
Affiliation(s)
- Mathieu Milh
- Inserm, UMR_S 910, Génétique Médicale et Génomique Fonctionnelle; Marseille France
- Aix Marseille Université, GMGF, Faculté de Médecine; Marseille France
- APHM, Hôpital d'Enfants de La Timone; Service de Neurologie Pédiatrique; Marseille France
| | - Caroline Lacoste
- Inserm, UMR_S 910, Génétique Médicale et Génomique Fonctionnelle; Marseille France
- Aix Marseille Université, GMGF, Faculté de Médecine; Marseille France
- APHM, Hôpital d'Enfants de La Timone; Département de Génétique Médicale; Marseille France
| | - Pierre Cacciagli
- Inserm, UMR_S 910, Génétique Médicale et Génomique Fonctionnelle; Marseille France
- Aix Marseille Université, GMGF, Faculté de Médecine; Marseille France
- APHM, Hôpital d'Enfants de La Timone; Département de Génétique Médicale; Marseille France
| | - Affef Abidi
- Inserm, UMR_S 910, Génétique Médicale et Génomique Fonctionnelle; Marseille France
- Aix Marseille Université, GMGF, Faculté de Médecine; Marseille France
| | - Julie Sutera-Sardo
- Inserm, UMR_S 910, Génétique Médicale et Génomique Fonctionnelle; Marseille France
- Aix Marseille Université, GMGF, Faculté de Médecine; Marseille France
- APHM, Hôpital d'Enfants de La Timone; Service de Neurologie Pédiatrique; Marseille France
| | - Ilias Tzelepis
- Inserm, UMR_S 910, Génétique Médicale et Génomique Fonctionnelle; Marseille France
- Aix Marseille Université, GMGF, Faculté de Médecine; Marseille France
| | - Estelle Colin
- Département de Biochimie et Génétique; CHU d'Angers; Angers France
| | - Catherine Badens
- Inserm, UMR_S 910, Génétique Médicale et Génomique Fonctionnelle; Marseille France
- Aix Marseille Université, GMGF, Faculté de Médecine; Marseille France
- APHM, Hôpital d'Enfants de La Timone; Département de Génétique Médicale; Marseille France
| | - Alexandra Afenjar
- APHP, Hôpital Trousseau; Service de génétique clinique et Service de neuropédiatrie; Paris France
| | | | - Thomas Dailland
- Centre Hospitalier des Pays de Morlaix; Pédiatrie et Néonatalogie; Morlaix France
| | - Gaetan Lesca
- Département de Génétique Médicale, Hospices Civils de Lyon; Université Lyon 1; Lyon France
| | - Nicole Philip
- Inserm, UMR_S 910, Génétique Médicale et Génomique Fonctionnelle; Marseille France
- Aix Marseille Université, GMGF, Faculté de Médecine; Marseille France
- APHM, Hôpital d'Enfants de La Timone; Département de Génétique Médicale; Marseille France
| | - Laurent Villard
- Inserm, UMR_S 910, Génétique Médicale et Génomique Fonctionnelle; Marseille France
- Aix Marseille Université, GMGF, Faculté de Médecine; Marseille France
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Nissenkorn A, Levy-Drummer RS, Bondi O, Renieri A, Villard L, Mari F, Mencarelli MA, Lo Rizzo C, Meloni I, Pineda M, Armstrong J, Clarke A, Bahi-Buisson N, Mejaski BV, Djuric M, Craiu D, Djukic A, Pini G, Bisgaard AM, Melegh B, Vignoli A, Russo S, Anghelescu C, Veneselli E, Hayek J, Ben-Zeev B. Epilepsy in Rett syndrome--lessons from the Rett networked database. Epilepsia 2015; 56:569-76. [PMID: 25789914 DOI: 10.1111/epi.12941] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 01/14/2015] [Indexed: 12/21/2022]
Abstract
OBJECTIVE Rett syndrome is an X-linked dominant neurodevelopmental disorder caused by mutations in the MECP2 gene, and characterized by cognitive and communicative regression, loss of hand use, and midline hand stereotypies. Epilepsy is a core symptom, but literature is controversial regarding genotype-phenotype correlation. Analysis of data from a large cohort should overcome this shortcoming. METHODS Data from the Rett Syndrome Networked Database on 1,248 female patients were included. Data on phenotypic and genotypic parameters, age of onset, severity of epilepsy, and type of seizures were collected. Statistical analysis was done using the IBM SPSS Version 21 software, logistic regression, and Kaplan-Meier survival curves. RESULTS Epilepsy was present in 68.1% of the patients, with uncontrolled seizures in 32.6% of the patients with epilepsy. Mean age of onset of epilepsy was 4.68 ± (standard deviation) 3.5 years. Younger age of onset was correlated to severity of epilepsy (Spearman correlation r = 0.668, p < 0.01). Patients with late truncating deletions had lower prevalence of epilepsy. Compared to them, the p.R133C mutation, associated with a milder Rett phenotype, increased the risk for epilepsy (odds ratio [OR] 2.46, confidence interval [CI] 95% 1.3-4.66), but not for severe epilepsy. The p.R255X mutation conferred an increased risk for epilepsy (OR 2.07, CI 95% 1.2-3.59) as well as for severe epilepsy (OR 3.4, CI 95% 1.6-7.3). The p.T158M and p.C306C mutations relatively increased the risk for severe epilepsy (OR 3.09 and 2.69, CI 95% 1.48-6.4 and 1.19-6.05, respectively), but not for epilepsy occurrence. SIGNIFICANCE Various mutations in the MECP2 gene have a different influence on epilepsy, unrelated to the severity of the general Rett phenotype. This might suggest a site-specific effect of MeCp2 on epileptic pathways. Further investigation of these mechanisms should promote better understanding of epileptogenesis in Rett syndrome.
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Affiliation(s)
- Andreea Nissenkorn
- Pediatric Neurology Unit and Rett National Center, Edmond and Lily Safra Children's Hospital, Sheba Medical Center, Tel HaShomer, Israel; Sackler School of Medicine, Tel Aviv University, Tel Aviv, Israel
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Poulat AL, Ville D, de Bellescize J, André-Obadia N, Cacciagli P, Milh M, Villard L, Lesca G. Homozygous TBC1D24 mutation in two siblings with familial infantile myoclonic epilepsy (FIME) and moderate intellectual disability. Epilepsy Res 2015; 111:72-7. [PMID: 25769375 DOI: 10.1016/j.eplepsyres.2015.01.008] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2014] [Revised: 01/10/2015] [Accepted: 01/19/2015] [Indexed: 10/24/2022]
Abstract
Mutations in the TBC1D24 gene were first reported in an Italian family with a unique epileptic phenotype consisting of drug-responsive, early-onset idiopathic myoclonic seizures. Patients presented with isolated bilateral or focal myoclonia, which could evolve to long-lasting attacks without loss of consciousness, with a peculiar reflex component, and were associated with generalized tonic-clonic seizures. This entity was named "familial infantile myoclonic epilepsy" (FIME). More recently, TBC1D24 mutations have been shown to cause a variable range of disorders, including epilepsy of various seizure types and severity, non-syndromic deafness, and DOORS syndrome. We report on the electro-clinical features of two brothers, born to first-cousin parents, affected with infantile-onset myoclonic epilepsy. The peculiar epileptic presentation prompted us to perform direct sequencing of the TBC1D24 gene. The patients had very early onset of focal myoclonic fits with variable topography, lasting a few minutes to several hours, without loss of consciousness, which frequently evolved to generalized myoclonus or myoclonic status. Reflex myoclonia were noticed in one patient. Neurological outcome was marked by moderate intellectual disability. Despite the high frequency of seizures, repeated EEG recordings showed normal background rhythm and rare interictal spikes and waves. We found a homozygous missense mutation, c.457G>A/p.Glu153Lys, in the two affected brothers. This observation combined with recent data from the literature, suggest that mutations in TBCD24 cause a pathological continuum, with FIME at the "benign" end and severe drug-refractory epileptic encephalopathy on the severe end. Early-onset myoclonic epilepsy with focal and generalized myoclonic seizures is a common characteristic of this continuum.
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Affiliation(s)
- Anne-Lise Poulat
- Department of Pediatric Neurology, Groupement Hospitalier Est, Hospices Civils de Lyon, Lyon, France; Neurophysiology and Epilepsy Unit, Neurological Hospital P. Wertheimer, Hospices Civils de Lyon, Lyon, France
| | - Dorothée Ville
- Department of Pediatric Neurology, Groupement Hospitalier Est, Hospices Civils de Lyon, Lyon, France; Neurophysiology and Epilepsy Unit, Neurological Hospital P. Wertheimer, Hospices Civils de Lyon, Lyon, France
| | - Julitta de Bellescize
- Epilepsy, Sleep and Pediatric Neurophysiology Dpt., Groupement Hospitalier Est, Hospices Civils de Lyon, Lyon, France; Neurophysiology and Epilepsy Unit, Neurological Hospital P. Wertheimer, Hospices Civils de Lyon, Lyon, France
| | - Nathalie André-Obadia
- Department Epilepsy, Sleep and Functional Neurological Explorations, Groupement Hospitalier Est, Hospices Civils de Lyon, Lyon, France; Neurophysiology and Epilepsy Unit, Neurological Hospital P. Wertheimer, Hospices Civils de Lyon, Lyon, France
| | - Pierre Cacciagli
- INSERM, GMGF UMR_S 910, 13385, Aix Marseille Université, Marseille, France; Neurophysiology and Epilepsy Unit, Neurological Hospital P. Wertheimer, Hospices Civils de Lyon, Lyon, France
| | - Mathieu Milh
- INSERM, GMGF UMR_S 910, 13385, Aix Marseille Université, Marseille, France; Service de Neurologie Pédiatrique, Hopital de la Timone-Enfants, APHM, Marseille, France; Neurophysiology and Epilepsy Unit, Neurological Hospital P. Wertheimer, Hospices Civils de Lyon, Lyon, France
| | - Laurent Villard
- INSERM, GMGF UMR_S 910, 13385, Aix Marseille Université, Marseille, France; Neurophysiology and Epilepsy Unit, Neurological Hospital P. Wertheimer, Hospices Civils de Lyon, Lyon, France
| | - Gaetan Lesca
- Department of Medical Genetics, Hospices Civils de Lyon, Lyon, France; Université Lyon 1, Lyon, France; Neurophysiology and Epilepsy Unit, Neurological Hospital P. Wertheimer, Hospices Civils de Lyon, Lyon, France.
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Thevenon J, Milh M, Feillet F, St-Onge J, Duffourd Y, Jugé C, Roubertie A, Héron D, Mignot C, Raffo E, Isidor B, Wahlen S, Sanlaville D, Villeneuve N, Darmency-Stamboul V, Toutain A, Lefebvre M, Chouchane M, Huet F, Lafon A, de Saint Martin A, Lesca G, El Chehadeh S, Thauvin-Robinet C, Masurel-Paulet A, Odent S, Villard L, Philippe C, Faivre L, Rivière JB. Mutations in SLC13A5 cause autosomal-recessive epileptic encephalopathy with seizure onset in the first days of life. Am J Hum Genet 2014; 95:113-20. [PMID: 24995870 DOI: 10.1016/j.ajhg.2014.06.006] [Citation(s) in RCA: 100] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2014] [Accepted: 06/11/2014] [Indexed: 01/01/2023] Open
Abstract
Epileptic encephalopathy (EE) refers to a clinically and genetically heterogeneous group of severe disorders characterized by seizures, abnormal interictal electro-encephalogram, psychomotor delay, and/or cognitive deterioration. We ascertained two multiplex families (including one consanguineous family) consistent with an autosomal-recessive inheritance pattern of EE. All seven affected individuals developed subclinical seizures as early as the first day of life, severe epileptic disease, and profound developmental delay with no facial dysmorphism. Given the similarity in clinical presentation in the two families, we hypothesized that the observed phenotype was due to mutations in the same gene, and we performed exome sequencing in three affected individuals. Analysis of rare variants in genes consistent with an autosomal-recessive mode of inheritance led to identification of mutations in SLC13A5, which encodes the cytoplasmic sodium-dependent citrate carrier, notably expressed in neurons. Disease association was confirmed by cosegregation analysis in additional family members. Screening of 68 additional unrelated individuals with early-onset epileptic encephalopathy for SLC13A5 mutations led to identification of one additional subject with compound heterozygous mutations of SLC13A5 and a similar clinical presentation as the index subjects. Mutations affected key residues for sodium binding, which is critical for citrate transport. These findings underline the value of careful clinical characterization for genetic investigations in highly heterogeneous conditions such as EE and further highlight the role of citrate metabolism in epilepsy.
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