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Grenier K, Rivière JB, Bencheikh BOA, Corredor ALG, Shieh BC, Wang H, Fiset PO, Camilleri-Broët S. Routine Clinically Detected Increased ROS1 Transcripts Are Related With ROS1 Expression by Immunohistochemistry and Associated With EGFR Mutations in Lung Adenocarcinoma. JTO Clin Res Rep 2023; 4:100530. [PMID: 37415647 PMCID: PMC10320302 DOI: 10.1016/j.jtocrr.2023.100530] [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: 02/05/2023] [Revised: 05/11/2023] [Accepted: 05/16/2023] [Indexed: 07/08/2023] Open
Abstract
Introduction Translocations of the ROS1 gene were found to drive tumorigenesis in 1% to 2% of lung adenocarcinoma. In clinical practice, ROS1 rearrangements are often screened by immunohistochemistry (IHC) before confirmation with either fluorescence in situ hybridization or molecular techniques. This screening test leads to a non-negligible number of cases that have equivocal or positive ROS1 IHC, without ROS1 translocation. Methods In this study, we have analyzed retrospectively 1021 cases of nonsquamous NSCLC having both ROS1 IHC and molecular analysis using next-generation sequencing. Results ROS1 IHC was negative in 938 cases (91.9%), equivocal in 65 cases (6.4%), and positive in 18 cases (1.7%). Among these 83 equivocal or positive cases, only two were ROS1 rearranged, leading to a low predictive positive value of the IHC test (2%). ROS1-positive IHC was correlated with an increased mRNA ROS1 transcripts. Moreover, we have found a mean statistically significant relationship between ROS1 expression and EGFR gene mutations, suggesting a crosstalk mechanism between these oncogenic driver molecules. Conclusion This study demonstrates that ROS1 IHC represents true ROS1 mRNA expression, and raises the question of a potential benefit of combined targeted therapy in EGFR-mutated NSCLC.
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Affiliation(s)
- Karl Grenier
- Department of Pathology, McGill University Health Center, Montreal, Quebec, Canada
- Department of Laboratory Medicine, Montreal, Quebec, Canada
| | - Jean-Baptiste Rivière
- Department of Laboratory Medicine, Montreal, Quebec, Canada
- Division of Molecular Genetics, McGill University Health Center, Montreal, Quebec, Canada
| | - Bouchra Ouled Amar Bencheikh
- Department of Laboratory Medicine, Montreal, Quebec, Canada
- Division of Molecular Genetics, McGill University Health Center, Montreal, Quebec, Canada
| | - Andrea Liliam Gomez Corredor
- Department of Pathology, McGill University Health Center, Montreal, Quebec, Canada
- Department of Laboratory Medicine, Montreal, Quebec, Canada
- Division of Molecular Genetics, McGill University Health Center, Montreal, Quebec, Canada
| | | | - Hangjun Wang
- Department of Pathology, McGill University Health Center, Montreal, Quebec, Canada
- Department of Laboratory Medicine, Montreal, Quebec, Canada
| | - Pierre Olivier Fiset
- Department of Pathology, McGill University Health Center, Montreal, Quebec, Canada
- Department of Laboratory Medicine, Montreal, Quebec, Canada
| | - Sophie Camilleri-Broët
- Department of Pathology, McGill University Health Center, Montreal, Quebec, Canada
- Department of Laboratory Medicine, Montreal, Quebec, Canada
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Ouled Amar Bencheikh B, Senkevich K, Rudakou U, Yu E, Mufti K, Ruskey JA, Asayesh F, Laurent SB, Spiegelman D, Fahn S, Waters C, Monchi O, Dauvilliers Y, Espay AJ, Dupré N, Greenbaum L, Hassin-Baer S, Rouleau GA, Alcalay RN, Fon EA, Gan-Or Z. Variants in the Niemann-Pick type C gene NPC1 are not associated with Parkinson's disease. Neurobiol Aging 2020; 93:143.e1-143.e4. [PMID: 32371106 PMCID: PMC7302975 DOI: 10.1016/j.neurobiolaging.2020.03.021] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [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: 03/04/2020] [Revised: 03/27/2020] [Accepted: 03/28/2020] [Indexed: 12/27/2022]
Abstract
Biallelic variants in NPC1, a gene coding for a lysosomal transmembrane protein involved in cholesterol trafficking, may cause Niemann-Pick disease type C (NPC). A few cases of NPC1 variant carriers with Parkinson's disease (PD) have been reported. In addition, pathologic studies have demonstrated phosphorylated alpha-synuclein and Lewy pathology in brains of NPC patients. Therefore, we aimed to examine whether NPC1 genetic variants may be associated with PD. Full sequencing of NPC1 was performed in 2657 PD patients and 3647 controls from 3 cohorts, using targeted sequencing with molecular inversion probes. A total of 9 common variants and 126 rare variants were identified across the 3 cohorts. To examine their association with PD, regression models adjusted for age, sex, and origin were performed for common variants, and optimal sequence Kernel association test (SKAT-O) was performed for rare variants. After correction for multiple comparisons, common and rare NPC1 variants were not associated with PD. Our results do not support a link between heterozygous variants in NPC1 and PD.
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Affiliation(s)
- Bouchra Ouled Amar Bencheikh
- Montreal Neurological Institute, McGill University, Montréal, Quebec, Canada; Centre de Recherche, Centre Hospitalier de l'Universite de Montreal, Montreal, Quebec, Canada
| | - Konstantin Senkevich
- Montreal Neurological Institute, McGill University, Montréal, Quebec, Canada; Department of Neurology and neurosurgery, McGill University, Montréal, Quebec, Canada
| | - Uladzislau Rudakou
- Montreal Neurological Institute, McGill University, Montréal, Quebec, Canada; Department of Human Genetics, McGill University, Montréal, Quebec, Canada
| | - Eric Yu
- Montreal Neurological Institute, McGill University, Montréal, Quebec, Canada; Department of Human Genetics, McGill University, Montréal, Quebec, Canada
| | - Kheireddin Mufti
- Montreal Neurological Institute, McGill University, Montréal, Quebec, Canada; Department of Human Genetics, McGill University, Montréal, Quebec, Canada
| | - Jennifer A Ruskey
- Montreal Neurological Institute, McGill University, Montréal, Quebec, Canada; Department of Neurology and neurosurgery, McGill University, Montréal, Quebec, Canada
| | - Farnaz Asayesh
- Montreal Neurological Institute, McGill University, Montréal, Quebec, Canada; Department of Neurology and neurosurgery, McGill University, Montréal, Quebec, Canada
| | - Sandra B Laurent
- Montreal Neurological Institute, McGill University, Montréal, Quebec, Canada; Department of Neurology and neurosurgery, McGill University, Montréal, Quebec, Canada
| | - Dan Spiegelman
- Montreal Neurological Institute, McGill University, Montréal, Quebec, Canada
| | - Stanley Fahn
- Department of Neurology, College of Physicians and Surgeons, Columbia University Medical Center, New York, NY, USA
| | - Cheryl Waters
- Department of Neurology, College of Physicians and Surgeons, Columbia University Medical Center, New York, NY, USA
| | - Oury Monchi
- Department of Neurology and neurosurgery, McGill University, Montréal, Quebec, Canada; Department of Clinical Neurosciences and Department of Radiology, University of Calgary, Calgary, Alberta, Canada; Hotchkiss Brain Institute, Cumming School of Medicine, Calgary, Alberta, Canada
| | - Yves Dauvilliers
- Department of Neurology, National Reference Center for Narcolepsy, Sleep Unit, Gui-de-Chauliac Hospital, CHU Montpellier, University of Montpellier, Montpellier, France
| | - Alberto J Espay
- Department of Neurology, Gardner Family Center for Parkinson's Disease and Movement Disorders, University of Cincinnati, Cincinnati, OH, USA
| | - Nicolas Dupré
- Division of Neurosciences, CHU de Québec, Université Laval, Quebec City, Quebec, Canada; Department of Medicine, Faculty of Medicine, Université Laval, Québec, Quebec, Canada
| | - Lior Greenbaum
- Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel; The Danek Gertner Institute of Human Genetics, Sheba Medical Center, Tel Hashomer, Israel; The Joseph Sagol Neuroscience Center, Sheba Medical Center, Tel Hashomer, Israel
| | - Sharon Hassin-Baer
- Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel; The Joseph Sagol Neuroscience Center, Sheba Medical Center, Tel Hashomer, Israel; Department of Neurology, The Movement Disorders Institute, Sheba Medical Center, Tel Hashomer, Israel
| | - Guy A Rouleau
- Montreal Neurological Institute, McGill University, Montréal, Quebec, Canada; Department of Neurology and neurosurgery, McGill University, Montréal, Quebec, Canada; Department of Human Genetics, McGill University, Montréal, Quebec, Canada
| | - Roy N Alcalay
- Department of Neurology, College of Physicians and Surgeons, Columbia University Medical Center, New York, NY, USA; Taub Institute for Research on Alzheimer's Disease and the Aging Brain, Columbia University Medical Center, New York, NY, USA
| | - Edward A Fon
- Montreal Neurological Institute, McGill University, Montréal, Quebec, Canada; Department of Neurology and neurosurgery, McGill University, Montréal, Quebec, Canada
| | - Ziv Gan-Or
- Montreal Neurological Institute, McGill University, Montréal, Quebec, Canada; Department of Neurology and neurosurgery, McGill University, Montréal, Quebec, Canada; Department of Human Genetics, McGill University, Montréal, Quebec, Canada.
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El Bairi K, Jabi R, Trapani D, Boutallaka H, Ouled Amar Bencheikh B, Bouziane M, Amrani M, Afqir S, Maleb A. Can the microbiota predict response to systemic cancer therapy, surgical outcomes, and survival? The answer is in the gut. Expert Rev Clin Pharmacol 2020; 13:403-421. [PMID: 32308061 DOI: 10.1080/17512433.2020.1758063] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [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] [Indexed: 02/06/2023]
Abstract
INTRODUCTION The gut microbiota seems to play a key role in tumorigenesis, across various hallmarks of cancer. Recent evidence suggests its potential use as a biomarker predicting drug response and adding prognostic information, generally in the context of immuno-oncology. AREAS COVERED In this review, we focus on the modulating effects of gut microbiota dysbiosis on various anticancer molecules used in practice, including cytotoxic and immune-modulating agents, primarily immune-checkpoint inhibitors (ICI). Pubmed/Medline-based literature search was conducted to find potential original studies that discuss gut microbiota as a prognostic and predictive biomarker for cancer therapy. We also looked at the US ClinicalTrials.gov website to find additional studies particularly ongoing human clinical trials. EXPERT COMMENTARY Sequencing of stool-derived materials and tissue samples from cancer patients and animal models has shown a significant enrichment of various bacteria such as Fusobacterium nucleatum and Bacteroides fragilis were associated with resistant disease and poorer outcomes. Gut microbiota was also found to be associated with surgical outcomes and seems to play a significant role in anastomotic leak (ATL) after surgery mainly by collagen breakdown. However, this research field is just at the beginning and the current findings are not yet ready to change clinical practice.
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Affiliation(s)
- Khalid El Bairi
- Cancer Biomarkers Working Group, Mohamed Ist University , Oujda, Morocco
- Faculty of Medicine and Pharmacy, Mohamed Ist University , Oujda, Morocco
| | - Rachid Jabi
- Faculty of Medicine and Pharmacy, Mohamed Ist University , Oujda, Morocco
- Department of Visceral Surgery, Mohamed VI University Hospital , Oujda, Morocco
| | - Dario Trapani
- Department of Haematology and Oncology, European Institute of Oncology, IEO, IRCCS, University of Milano , Milan, Italy
| | - Hanae Boutallaka
- Department of Gastroenterology and Digestive Endoscopy, Mohamed V Military Teaching Hospital of Rabat, Mohamed V University , Rabat, Morocco
| | | | - Mohammed Bouziane
- Faculty of Medicine and Pharmacy, Mohamed Ist University , Oujda, Morocco
- Department of Visceral Surgery, Mohamed VI University Hospital , Oujda, Morocco
| | - Mariam Amrani
- Department of Pathology, National Institute of Oncology, Faculty of Medicine and Pharmacy, Mohamed V University , Rabat, Morocco
| | - Said Afqir
- Cancer Biomarkers Working Group, Mohamed Ist University , Oujda, Morocco
- Faculty of Medicine and Pharmacy, Mohamed Ist University , Oujda, Morocco
- Department of Medical Oncology, Mohamed VI University Hospital , Oujda, Morocco
| | - Adil Maleb
- Faculty of Medicine and Pharmacy, Mohamed Ist University , Oujda, Morocco
- Department of Microbiology, Mohamed VI University Hospital , Oujda, Morocco
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Krohn L, Öztürk TN, Vanderperre B, Ouled Amar Bencheikh B, Ruskey JA, Laurent SB, Spiegelman D, Postuma RB, Arnulf I, Hu MTM, Dauvilliers Y, Högl B, Stefani A, Monaca CC, Plazzi G, Antelmi E, Ferini-Strambi L, Heidbreder A, Rudakou U, Cochen De Cock V, Young P, Wolf P, Oliva P, Zhang XK, Greenbaum L, Liong C, Gagnon JF, Desautels A, Hassin-Baer S, Montplaisir JY, Dupré N, Rouleau GA, Fon EA, Trempe JF, Lamoureux G, Alcalay RN, Gan-Or Z. Genetic, Structural, and Functional Evidence Link TMEM175 to Synucleinopathies. Ann Neurol 2019; 87:139-153. [PMID: 31658403 DOI: 10.1002/ana.25629] [Citation(s) in RCA: 47] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2018] [Revised: 10/21/2019] [Accepted: 10/21/2019] [Indexed: 02/01/2023]
Abstract
OBJECTIVE The TMEM175/GAK/DGKQ locus is the 3rd strongest risk locus in genome-wide association studies of Parkinson disease (PD). We aimed to identify the specific disease-associated variants in this locus, and their potential implications. METHODS Full sequencing of TMEM175/GAK/DGKQ followed by genotyping of specific associated variants was performed in PD (n = 1,575) and rapid eye movement sleep behavior disorder (RBD) patients (n = 533) and in controls (n = 1,583). Adjusted regression models and a meta-analysis were performed. Association between variants and glucocerebrosidase (GCase) activity was analyzed in 715 individuals with available data. Homology modeling, molecular dynamics simulations, and lysosomal localization experiments were performed on TMEM175 variants to determine their potential effects on structure and function. RESULTS Two coding variants, TMEM175 p.M393T (odds ratio [OR] = 1.37, p = 0.0003) and p.Q65P (OR = 0.72, p = 0.005), were associated with PD, and p.M393T was also associated with RBD (OR = 1.59, p = 0.001). TMEM175 p.M393T was associated with reduced GCase activity. Homology modeling and normal mode analysis demonstrated that TMEM175 p.M393T creates a polar side-chain in the hydrophobic core of the transmembrane, which could destabilize the domain and thus impair either its assembly, maturation, or trafficking. Molecular dynamics simulations demonstrated that the p.Q65P variant may increase stability and ion conductance of the transmembrane protein, and lysosomal localization was not affected by these variants. INTERPRETATION Coding variants in TMEM175 are likely to be responsible for the association in the TMEM175/GAK/DGKQ locus, which could be mediated by affecting GCase activity. ANN NEUROL 2020;87:139-153.
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Affiliation(s)
- Lynne Krohn
- Department of Human Genetics, McGill University, Montreal, Quebec, Canada.,Montreal Neurological Institute, McGill University, Montreal, Quebec, Canada
| | - Tuğba Nur Öztürk
- Department of Physics, Concordia University, Montreal, Quebec, Canada.,Centre for Research in Molecular Modeling (CERMM), Concordia University, Montreal, Quebec, Canada.,PROTEO, The Quebec Network for Research on Protein Function, Engineering and Applications, Quebec, Quebec, Canada
| | - Benoît Vanderperre
- Montreal Neurological Institute, McGill University, Montreal, Quebec, Canada.,Department of Neurology and Neurosurgery, McGill University, Montreal, Quebec, Canada
| | - Bouchra Ouled Amar Bencheikh
- Montreal Neurological Institute, McGill University, Montreal, Quebec, Canada.,Department of Neurology and Neurosurgery, McGill University, Montreal, Quebec, Canada
| | - Jennifer A Ruskey
- Montreal Neurological Institute, McGill University, Montreal, Quebec, Canada.,Department of Neurology and Neurosurgery, McGill University, Montreal, Quebec, Canada
| | - Sandra B Laurent
- Montreal Neurological Institute, McGill University, Montreal, Quebec, Canada.,Department of Neurology and Neurosurgery, McGill University, Montreal, Quebec, Canada
| | - Dan Spiegelman
- Montreal Neurological Institute, McGill University, Montreal, Quebec, Canada.,Department of Neurology and Neurosurgery, McGill University, Montreal, Quebec, Canada
| | - Ronald B Postuma
- Montreal Neurological Institute, McGill University, Montreal, Quebec, Canada.,Department of Neurology and Neurosurgery, McGill University, Montreal, Quebec, Canada
| | - Isabelle Arnulf
- Sleep Disorders Unit, Pitié Salpêtrière Hospital, Institute of Brain and Spinal Cord and Sorbonne University, Paris, France
| | - Michele T M Hu
- Oxford Parkinson's Disease Centre, University of Oxford, Oxford, United Kingdom.,Nuffield Department of Clinical Neurosciences, University of Oxford, Oxford, United Kingdom
| | - Yves Dauvilliers
- National Reference Center for Narcolepsy, Sleep Unit, Department of Neurology, Gui de Chauliac Hospital, University Hospital Center Montpellier, University of Montpellier, National Institute of Health and Medical Research U1061, Montpellier, France
| | - Birgit Högl
- Sleep Disorders Clinic, Department of Neurology, Medical University of Innsbruck, Innsbruck, Austria
| | - Ambra Stefani
- Sleep Disorders Clinic, Department of Neurology, Medical University of Innsbruck, Innsbruck, Austria
| | - Christelle Charley Monaca
- University of Lille Nord de France, Department of Clinical Neurophysiology and Sleep Center, University Hospital Center Lille, Lille, France
| | - Giuseppe Plazzi
- Department of Biomedical and Neuromotor Sciences, Alma Mater Studiorum, University of Bologna, Bologna, Italy.,Scientific Institute for Research and Health Care, Institute of Neurological Sciences of Bologna, Bologna, Italy
| | - Elena Antelmi
- Department of Biomedical and Neuromotor Sciences, Alma Mater Studiorum, University of Bologna, Bologna, Italy.,Scientific Institute for Research and Health Care, Institute of Neurological Sciences of Bologna, Bologna, Italy
| | - Luigi Ferini-Strambi
- Department of Neurological Sciences, Vita-Salute San Raffaele University, Milan, Italy
| | - Anna Heidbreder
- Institute of Sleep Medicine and Neuromuscular Disorders, University of Münster, Münster, Germany
| | - Uladzislau Rudakou
- Department of Human Genetics, McGill University, Montreal, Quebec, Canada.,Montreal Neurological Institute, McGill University, Montreal, Quebec, Canada
| | - Valérie Cochen De Cock
- Sleep and Neurology Unit, Beau Soleil Clinic, Montpellier, France.,EuroMov, University of Montpellier, Montpellier, France
| | - Peter Young
- Institute of Sleep Medicine and Neuromuscular Disorders, University of Münster, Münster, Germany
| | - Pavlina Wolf
- Biologics Structural and Functional Research, Biopharmaceutics Development, Genzyme, Framingham, MA
| | - Petra Oliva
- Biologics Structural and Functional Research, Biopharmaceutics Development, Genzyme, Framingham, MA
| | - Xiaokui Kate Zhang
- Biologics Structural and Functional Research, Biopharmaceutics Development, Genzyme, Framingham, MA
| | - Lior Greenbaum
- Danek Gertner Institute of Human Genetics, Sheba Medical Center, Tel Hashomer, Israel.,Joseph Sagol Neuroscience Center, Sheba Medical Center, Tel Hashomer, Israel.,Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel
| | - Christopher Liong
- Department of Neurology, College of Physicians and Surgeons, Columbia University Medical Center, New York, NY
| | - Jean-François Gagnon
- Center for Advanced Research in Sleep Medicine, Sacred Heart Hospital of Montreal, Montreal, Quebec, Canada.,Department of Psychology, University of Quebec at Montreal, Montreal, Quebec, Canada
| | - Alex Desautels
- Center for Advanced Research in Sleep Medicine, Sacred Heart Hospital of Montreal, Montreal, Quebec, Canada.,Department of Neurosciences, University of Quebec at Montreal, Montreal, Quebec, Canada
| | - Sharon Hassin-Baer
- Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel.,Department of Neurology, College of Physicians and Surgeons, Columbia University Medical Center, New York, NY.,The Movement Disorders Institute, Department of Neurology, Sheba Medical Center, Tel Hashomer, Israel
| | - Jacques Y Montplaisir
- Center for Advanced Research in Sleep Medicine, Sacred Heart Hospital of Montreal, Montreal, Quebec, Canada.,Department of Psychiatry, University of Montreal, Montreal, Quebec, Canada
| | - Nicolas Dupré
- Division of Neurosciences, University Hospital Center of Quebec, Laval University, Quebec City, Quebec, Canada.,Department of Medicine, Faculty of Medicine, Laval University, Quebec City, Quebec, Canada
| | - Guy A Rouleau
- Department of Human Genetics, McGill University, Montreal, Quebec, Canada.,Montreal Neurological Institute, McGill University, Montreal, Quebec, Canada.,Department of Neurology and Neurosurgery, McGill University, Montreal, Quebec, Canada
| | - Edward A Fon
- Montreal Neurological Institute, McGill University, Montreal, Quebec, Canada.,Department of Neurology and Neurosurgery, McGill University, Montreal, Quebec, Canada
| | - Jean-François Trempe
- Department of Pharmacology and Therapeutics, McGill University, Montreal, Quebec, Canada
| | - Guillaume Lamoureux
- Department of Physics, Concordia University, Montreal, Quebec, Canada.,Centre for Research in Molecular Modeling (CERMM), Concordia University, Montreal, Quebec, Canada.,PROTEO, The Quebec Network for Research on Protein Function, Engineering and Applications, Quebec, Quebec, Canada.,Department of Chemistry, Rutgers University - Camden, Camden, NJ, USA.,Center for Computational and Integrative Biology (CCIB), Camden, NY, USA
| | - Roy N Alcalay
- Department of Neurology, College of Physicians and Surgeons, Columbia University Medical Center, New York, NY.,Taub Institute for Research on Alzheimer's Disease and the Aging Brain, College of Physicians and Surgeons, Columbia University Medical Center, New York, NY
| | - Ziv Gan-Or
- Department of Human Genetics, McGill University, Montreal, Quebec, Canada.,Montreal Neurological Institute, McGill University, Montreal, Quebec, Canada.,Department of Neurology and Neurosurgery, McGill University, Montreal, Quebec, Canada
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Liao M, Kundap U, Rosch RE, Burrows DRW, Meyer MP, Ouled Amar Bencheikh B, Cossette P, Samarut É. Targeted knockout of GABA-A receptor gamma 2 subunit provokes transient light-induced reflex seizures in zebrafish larvae. Dis Model Mech 2019; 12:dmm.040782. [PMID: 31582559 PMCID: PMC6899022 DOI: 10.1242/dmm.040782] [Citation(s) in RCA: 16] [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] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2019] [Accepted: 09/24/2019] [Indexed: 12/29/2022] Open
Abstract
Epilepsy is a common primary neurological disorder characterized by the chronic tendency of a patient to experience epileptic seizures, which are abnormal body movements or cognitive states that result from excessive, hypersynchronous brain activity. Epilepsy has been found to have numerous etiologies and, although about two-thirds of epilepsies were classically considered idiopathic, the majority of those are now believed to be of genetic origin. Mutations in genes involved in gamma-aminobutyric acid (GABA)-mediated inhibitory neurotransmission have been associated with a broad range of epilepsy syndromes. Mutations in the GABA-A receptor gamma 2 subunit gene (GABRG2), for example, have been associated with absence epilepsy and febrile seizures in humans. Several rodent models of GABRG2 loss of function depict clinical features of the disease; however, alternative genetic models more amenable for the study of ictogenesis and for high-throughput screening purposes are still needed. In this context, we generated a gabrg2 knockout (KO) zebrafish model (which we called R23X) that displayed light/dark-induced reflex seizures. Through high-resolution in vivo calcium imaging of the brain, we showed that this phenotype is associated with widespread increases in neuronal activity that can be effectively alleviated by the anti-epileptic drug valproic acid. Moreover, these seizures only occur at the larval stages but disappear after 1 week of age. Interestingly, our whole-transcriptome analysis showed that gabrg2 KO does not alter the expression of genes in the larval brain. As a result, the gabrg2−/− zebrafish is a novel in vivo genetic model of early epilepsies that opens new doors to investigate ictogenesis and for further drug-screening assays. Summary: The authors present a novel in vivo genetic model of idiopathic epilepsy in zebrafish (gabrg2−/−) to aid the study of ictogenesis and provide a convenient genetic tool for drug screening.
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Affiliation(s)
- Meijiang Liao
- Research Center of the University of Montreal Hospital Center (CRCHUM), Department of Neurosciences, Université de Montréal, Montréal, QC H2X 0A9, Canada
| | - Uday Kundap
- Research Center of the University of Montreal Hospital Center (CRCHUM), Department of Neurosciences, Université de Montréal, Montréal, QC H2X 0A9, Canada
| | - Richard E Rosch
- Department for Developmental Neurobiology, MRC Centre for Neurodevelopmental Disorders, Institute of Psychiatry, Psychology and Neuroscience, King's College London, London SE1 1UL, UK.,Department of Bioengineering, University of Pennsylvania, Philadelphia, PA 19104, USA.,Department of Paediatric Neurology, Great Ormond Street Hospital for Children NHS Foundation Trust, London WC1N 3JH, UK
| | - Dominic R W Burrows
- Department for Developmental Neurobiology, MRC Centre for Neurodevelopmental Disorders, Institute of Psychiatry, Psychology and Neuroscience, King's College London, London SE1 1UL, UK
| | - Martin P Meyer
- Department for Developmental Neurobiology, MRC Centre for Neurodevelopmental Disorders, Institute of Psychiatry, Psychology and Neuroscience, King's College London, London SE1 1UL, UK.,Department for Developmental Neurobiology, Centre for Developmental Neurobiology, Institute of Psychiatry, Psychology and Neuroscience, King's College London, London SE1 1UL, UK
| | - Bouchra Ouled Amar Bencheikh
- Montreal Neurological Institute and Hospital, McGill University, Montréal, QC H3A 2B4, Canada.,Neuroscience Department, Centre de Recherche, Centre Hospitalier de l'Université de Montréal, Montréal, QC H2X 0A9, Canada
| | - Patrick Cossette
- Research Center of the University of Montreal Hospital Center (CRCHUM), Department of Neurosciences, Université de Montréal, Montréal, QC H2X 0A9, Canada
| | - Éric Samarut
- Research Center of the University of Montreal Hospital Center (CRCHUM), Department of Neurosciences, Université de Montréal, Montréal, QC H2X 0A9, Canada .,Modelis Inc., Montréal, QC H2X 0A9, Canada
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Lyahyai J, Bencheikh BOA, Elalaoui SC, Mansouri M, Boualla L, DIonne-Laporte A, Spiegelman D, Dion PA, Cossette P, Rouleau GA, Sefiani A. Correction to: Exome sequencing reveals a novel PLP1 mutation in a Moroccan family with connatal Pelizaeus-Merzbacher disease: a case report. BMC Pediatr 2018; 18:138. [PMID: 29665810 PMCID: PMC5905117 DOI: 10.1186/s12887-018-1114-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/27/2022] Open
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7
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Lyahyai J, Ouled Amar Bencheikh B, Elalaoui SC, Mansouri M, Boualla L, DIonne-Laporte A, Spiegelman D, Dion PA, Cossette P, Rouleau GA, Sefiani A. Exome sequencing reveals a novel PLP1 mutation in a Moroccan family with connatal Pelizaeus-Merzbacher disease: a case report. BMC Pediatr 2018; 18:90. [PMID: 29486744 PMCID: PMC5830319 DOI: 10.1186/s12887-018-1063-5] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/12/2016] [Accepted: 02/15/2018] [Indexed: 11/20/2022] Open
Abstract
Background Epilepsy regroups a common and diverse set of chronic neurological disorders that are characterized by spontaneous, unprovoked, and recurrent epileptic seizures. Epilepsies have a highly heterogeneous background with a strong genetic contribution and various mode of inheritance. X-linked epilepsy usually manifests as part of a syndrome or epileptic encephalopathy. The variability of clinical manifestations of X-linked epilepsy may be attributed to several factors including the causal genetic mutation, making diagnosis, genetic counseling and treatment decisions difficult. We report the description of a Moroccan family referred to our genetic department with X-linked epileptic seizures as the only initial diagnosis. Case presentation Knowing the new contribution of Next-Generation Sequencing (NGS) for clinical investigation, and given the heterogeneity of this group of disorders we performed a Whole-Exome Sequencing (WES) analysis and co-segregation study in several members of this large family. We detected a novel pathogenic PLP1 missense mutation c.251C > A (p.Ala84Asp) allowing us to make a diagnosis of Pelizaeus-Merzbacher Disease for this family. Conclusion This report extends the spectrum of PLP1 mutations and highlights the diagnostic utility of NGS to investigate this group of heterogeneous disorders.
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Rudakou U, Ouled Amar Bencheikh B, Ruskey JA, Krohn L, Laurent SB, Spiegelman D, Liong C, Fahn S, Waters C, Monchi O, Fon EA, Dauvilliers Y, Alcalay RN, Dupré N, Gan-Or Z. Common and rare GCH1 variants are associated with Parkinson's disease. Neurobiol Aging 2018; 73:231.e1-231.e6. [PMID: 30314816 DOI: 10.1016/j.neurobiolaging.2018.09.008] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [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: 06/06/2018] [Revised: 09/07/2018] [Accepted: 09/07/2018] [Indexed: 01/19/2023]
Abstract
GCH1 encodes the enzyme guanosine triphospahte (GTP) cyclohydrolase 1, essential for dopamine synthesis in nigrostriatal cells, and rare mutations in GCH1 may lead to Dopa-responsive dystonia (DRD). While GCH1 is implicated in genomewide association studies in Parkinson's disease (PD), only a few studies examined the role of rare GCH1 variants in PD, with conflicting results. In the present study, GCH1 and its 5' and 3' untranslated regions were sequenced in 1113 patients with PD and 1111 controls. To examine the association of rare GCH1 variants with PD, burden analysis was performed. Three rare GCH1 variants, which were previously reported to be pathogenic in DRD, were found in five patients with PD and not in controls (sequence Kernel association test, p = 0.024). A common haplotype, tagged by rs841, was associated with a reduced risk for PD (OR = 0.71, 95% CI = 0.61-0.83, p = 1.24 × 10-4), and with increased GCH1 expression in brain regions relevant for PD (www.gtexportal.org). Our results support a role for rare, DRD-related variants, and common GCH1 variants in the pathogenesis of PD.
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Affiliation(s)
- Uladzislau Rudakou
- Department of Human Genetics, McGill University, Montréal, Quebec, Canada; Montreal Neurological Institute, McGill University, Montréal, Quebec, Canada
| | - Bouchra Ouled Amar Bencheikh
- Montreal Neurological Institute, McGill University, Montréal, Quebec, Canada; Centre de Recherche, Centre Hospitalier de l'Universite de Montreal, Montreal, Quebec, Canada
| | - Jennifer A Ruskey
- Montreal Neurological Institute, McGill University, Montréal, Quebec, Canada; Department of Neurology and Neurosurgery, McGill University, Montréal, Quebec, Canada
| | - Lynne Krohn
- Department of Human Genetics, McGill University, Montréal, Quebec, Canada; Montreal Neurological Institute, McGill University, Montréal, Quebec, Canada
| | - Sandra B Laurent
- Montreal Neurological Institute, McGill University, Montréal, Quebec, Canada; Department of Neurology and Neurosurgery, McGill University, Montréal, Quebec, Canada
| | - Dan Spiegelman
- Montreal Neurological Institute, McGill University, Montréal, Quebec, Canada; Department of Neurology and Neurosurgery, McGill University, Montréal, Quebec, Canada
| | - Christopher Liong
- Department of Neurology, College of Physicians and Surgeons, Columbia University Medical Center, New York, NY, USA
| | - Stanley Fahn
- Department of Neurology, College of Physicians and Surgeons, Columbia University Medical Center, New York, NY, USA
| | - Cheryl Waters
- Department of Neurology, College of Physicians and Surgeons, Columbia University Medical Center, New York, NY, USA
| | - Oury Monchi
- Department of Clinical Neurosciences and Department of Radiology, University of Calgary, Calgary, Alberta, Canada; Cumming School of Medicine, Hotchkiss Brain Institute, Calgary, Alberta, Canada
| | - Edward A Fon
- Montreal Neurological Institute, McGill University, Montréal, Quebec, Canada; McGill Parkinson Program and Neurodegenerative Diseases Group, Montreal Neurological Institute, McGill University, Montréal, Quebec, Canada
| | - Yves Dauvilliers
- National Reference Center for Narcolepsy, Sleep Unit, Department of Neurology, Gui-de-Chauliac Hospital, CHU Montpellier, University of Montpellier, Inserm U1061, Montpellier, France
| | - Roy N Alcalay
- Department of Neurology, College of Physicians and Surgeons, Columbia University Medical Center, New York, NY, USA; Taub Institute for Research on Alzheimer's Disease and the Aging Brain, College of Physicians and Surgeons, Columbia University Medical Center, New York, NY, USA
| | - Nicolas Dupré
- Division of Neurosciences, CHU de Québec, Université Laval, Québec City, Quebec, Canada; Department of Medicine, Faculty of Medicine, Université Laval, Québec City, Quebec, Canada
| | - Ziv Gan-Or
- Department of Human Genetics, McGill University, Montréal, Quebec, Canada; Montreal Neurological Institute, McGill University, Montréal, Quebec, Canada; Department of Neurology and Neurosurgery, McGill University, Montréal, Quebec, Canada.
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9
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Ouled Amar Bencheikh B, Leveille E, Ruskey JA, Spiegelman D, Liong C, Fon EA, Rouleau GA, Dauvilliers Y, Dupre N, Alcalay RN, Gan-Or Z. Sequencing of the GBA coactivator, Saposin C, in Parkinson disease. Neurobiol Aging 2018; 72:187.e1-187.e3. [PMID: 30037697 DOI: 10.1016/j.neurobiolaging.2018.06.034] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [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: 06/05/2018] [Accepted: 06/26/2018] [Indexed: 12/27/2022]
Abstract
Saposin C (SapC), encoded by PSAP, is required for the activity of glucocerebrosidase, encoded by GBA. Although GBA mutations have been studied thoroughly in Parkinson disease (PD), genetic studies on SapC are still lacking. PSAP was sequenced in 1123 PD patients and 1153 controls, and data from additional 1167 patients and 1685 controls were examined. A total of 6 patients had SapC mutations in the 2 combined cohorts, but no statistically significant association after correction for multiple comparisons was found. Larger studies are necessary to examine the role of very rare SapC variants in PD.
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Affiliation(s)
- Bouchra Ouled Amar Bencheikh
- Montreal Neurological Institute, McGill University, Montréal, QC, Canada; Centre de Recherche, Centre Hospitalier de l'Universite de Montreal, Montreal, Canada
| | | | - Jennifer A Ruskey
- Montreal Neurological Institute, McGill University, Montréal, QC, Canada; Department of Neurology and Neurosurgery, McGill University, Montréal, QC, Canada
| | - Dan Spiegelman
- Montreal Neurological Institute, McGill University, Montréal, QC, Canada
| | - Christopher Liong
- Department of Neurology, College of Physicians and Surgeons, Columbia University Medical Center, New York, NY, USA
| | - Edward A Fon
- Montreal Neurological Institute, McGill University, Montréal, QC, Canada; Department of Neurology and Neurosurgery, McGill University, Montréal, QC, Canada; McGill Parkinson Program and Neurodegenerative Diseases Group, Montreal Neurological Institute, McGill University, Montréal, QC, Canada
| | - Guy A Rouleau
- Montreal Neurological Institute, McGill University, Montréal, QC, Canada; Department of Neurology and Neurosurgery, McGill University, Montréal, QC, Canada; Department of Human Genetics, McGill University, Montréal, QC, Canada
| | - Yves Dauvilliers
- Department of Neurology Hôpital-Gui-de Chauliac, Sleep Unit, National Reference Network for Narcolepsy, CHU Montpellier, INSERM U1061, Montpellier, France
| | - Nicolas Dupre
- Axe neurosciences du CHU de Québec - Université Laval, Québec, QC, Canada; Faculty of Medicine, Department of Medicine, Laval University, Québec, QC, Canada
| | - Roy N Alcalay
- Department of Neurology, College of Physicians and Surgeons, Columbia University Medical Center, New York, NY, USA; Taub Institute for Research on Alzheimer's Disease and the Aging Brain, College of Physicians and Surgeons, Columbia University Medical Center, New York, NY, USA
| | - Ziv Gan-Or
- Montreal Neurological Institute, McGill University, Montréal, QC, Canada; Department of Neurology and Neurosurgery, McGill University, Montréal, QC, Canada; McGill Parkinson Program and Neurodegenerative Diseases Group, Montreal Neurological Institute, McGill University, Montréal, QC, Canada; Department of Human Genetics, McGill University, Montréal, QC, Canada.
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10
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Gan-Or Z, Bouslam N, Birouk N, Lissouba A, Chambers DB, Vérièpe J, Androschuk A, Laurent SB, Rochefort D, Spiegelman D, Dionne-Laporte A, Szuto A, Liao M, Figlewicz DA, Bouhouche A, Benomar A, Yahyaoui M, Ouazzani R, Yoon G, Dupré N, Suchowersky O, Bolduc FV, Parker JA, Dion PA, Drapeau P, Rouleau GA, Ouled Amar Bencheikh B. Mutations in CAPN1 Cause Autosomal-Recessive Hereditary Spastic Paraplegia. Am J Hum Genet 2016; 98:1271. [PMID: 27259058 DOI: 10.1016/j.ajhg.2016.05.009] [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] [Indexed: 11/19/2022] Open
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11
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Daoud H, Papadima EM, Ouled Amar Bencheikh B, Katsila T, Dionne-Laporte A, Spiegelman D, Dion PA, Patrinos GP, Orrù S, Rouleau GA. Identification of a novel homozygous SPG7 mutation by whole exome sequencing in a Greek family with a complicated form of hereditary spastic paraplegia. Eur J Med Genet 2015; 58:573-7. [PMID: 26260707 DOI: 10.1016/j.ejmg.2015.08.001] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [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: 04/23/2015] [Revised: 07/29/2015] [Accepted: 08/02/2015] [Indexed: 10/23/2022]
Abstract
We report the clinical description and genetic analyses of a Greek family with four individuals affected with a complicated form of hereditary spastic paraplegia (HSP) and a recessive pattern of inheritance. Exome sequencing of all affected individuals led to the identification of a homozygous 25 bp deletion predicted to lead to a frameshift and premature stop codon in the SPG7 gene, encoding paraplegin. This deletion, which is located in the first exon of the SPG7 gene, has not been previously reported and likely lead to the complete absence of the SPG7 protein. Interestingly, this family shows significant phenotypic heterogeneity further highlighting the clinical variability associated with SPG7 mutations. Our findings emphasize the clinical utility of whole exome sequencing for the molecular diagnosis of HSPs.
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Affiliation(s)
- Hussein Daoud
- Montreal Neurological Institute, Department of Neurology and Neurosurgery, McGill University, Montreal, Quebec, Canada
| | - Eleni Merkouri Papadima
- University of Patras School of Health Sciences, Department of Pharmacy, University Campus, Patras, Greece
| | - Bouchra Ouled Amar Bencheikh
- Montreal Neurological Institute, Department of Neurology and Neurosurgery, McGill University, Montreal, Quebec, Canada
| | - Theodora Katsila
- University of Patras School of Health Sciences, Department of Pharmacy, University Campus, Patras, Greece
| | - Alexandre Dionne-Laporte
- Montreal Neurological Institute, Department of Neurology and Neurosurgery, McGill University, Montreal, Quebec, Canada
| | - Dan Spiegelman
- Montreal Neurological Institute, Department of Neurology and Neurosurgery, McGill University, Montreal, Quebec, Canada
| | - Patrick A Dion
- Montreal Neurological Institute, Department of Neurology and Neurosurgery, McGill University, Montreal, Quebec, Canada
| | - George P Patrinos
- University of Patras School of Health Sciences, Department of Pharmacy, University Campus, Patras, Greece
| | - Sandro Orrù
- Genetica Medica, Dipartimento di Scienze Mediche, Università di Cagliari, Cagliari, Italy
| | - Guy A Rouleau
- Montreal Neurological Institute, Department of Neurology and Neurosurgery, McGill University, Montreal, Quebec, Canada.
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12
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Jouan L, Ouled Amar Bencheikh B, Daoud H, Dionne-Laporte A, Dobrzeniecka S, Spiegelman D, Rochefort D, Hince P, Szuto A, Lassonde M, Barbelanne M, Tsang WY, Dion PA, Théoret H, Rouleau GA. Exome sequencing identifies recessive CDK5RAP2 variants in patients with isolated agenesis of corpus callosum. Eur J Hum Genet 2015. [PMID: 26197979 DOI: 10.1038/ejhg.2015.156] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
Abstract
Agenesis of the corpus callosum (ACC) is a common brain malformation which can be observed either as an isolated condition or as part of numerous congenital syndromes. Therefore, cognitive and neurological involvements in patients with ACC are variable, from mild linguistic and behavioral impairments to more severe neurological deficits. To date, the underlying genetic causes of isolated ACC remains elusive and causative genes have yet to be identified. We performed exome sequencing on three acallosal siblings from the same non-consanguineous family and identified compound heterozygous variants, p.[Gly94Arg];[Asn1232Ser], in the protein encoded by the CDK5RAP2 gene, also known as MCPH3, a gene previously reported to cause autosomal recessive primary microcephaly. Our findings suggest a novel role for this gene in the pathogenesis of isolated ACC.
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Affiliation(s)
- Loubna Jouan
- Department of Neurology and Neurosurgery, Montreal Neurological Institute and Hospital, McGill University, Montréal, Québec, Canada
| | - Bouchra Ouled Amar Bencheikh
- Department of Neurology and Neurosurgery, Montreal Neurological Institute and Hospital, McGill University, Montréal, Québec, Canada
| | - Hussein Daoud
- Department of Neurology and Neurosurgery, Montreal Neurological Institute and Hospital, McGill University, Montréal, Québec, Canada
| | - Alexandre Dionne-Laporte
- Department of Neurology and Neurosurgery, Montreal Neurological Institute and Hospital, McGill University, Montréal, Québec, Canada
| | - Sylvia Dobrzeniecka
- Department of Neurology and Neurosurgery, Montreal Neurological Institute and Hospital, McGill University, Montréal, Québec, Canada
| | - Dan Spiegelman
- Department of Neurology and Neurosurgery, Montreal Neurological Institute and Hospital, McGill University, Montréal, Québec, Canada
| | - Daniel Rochefort
- Department of Neurology and Neurosurgery, Montreal Neurological Institute and Hospital, McGill University, Montréal, Québec, Canada
| | - Pascale Hince
- Department of Neurology and Neurosurgery, Montreal Neurological Institute and Hospital, McGill University, Montréal, Québec, Canada
| | - Anna Szuto
- Department of Neurology and Neurosurgery, Montreal Neurological Institute and Hospital, McGill University, Montréal, Québec, Canada
| | - Maryse Lassonde
- Department of Psychology, Université de Montréal, Montréal, Québec, Canada.,CHU Sainte-Justine Research Center, Montréal, Québec, Canada
| | - Marine Barbelanne
- Department of Pathology and Cell Biology, Faculty of Medicine, Université de Montréal, Montréal, Québec, Canada.,Institut de recherches cliniques de Montréal, Montréal, Québec, Canada
| | - William Y Tsang
- Department of Pathology and Cell Biology, Faculty of Medicine, Université de Montréal, Montréal, Québec, Canada.,Institut de recherches cliniques de Montréal, Montréal, Québec, Canada.,Division of Experimental Medicine, McGill University, Montréal, Québec, Canada
| | - Patrick A Dion
- Department of Neurology and Neurosurgery, Montreal Neurological Institute and Hospital, McGill University, Montréal, Québec, Canada.,Department of Pathology and Cell Biology, Faculty of Medicine, Université de Montréal, Montréal, Québec, Canada
| | - Hugo Théoret
- Department of Psychology, Université de Montréal, Montréal, Québec, Canada.,CHU Sainte-Justine Research Center, Montréal, Québec, Canada
| | - Guy A Rouleau
- Department of Neurology and Neurosurgery, Montreal Neurological Institute and Hospital, McGill University, Montréal, Québec, Canada
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13
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Mansouri M, Chafai Elalaoui S, Ouled Amar Bencheikh B, El Alloussi M, Dion PA, Sefiani A, Rouleau GA. A novel nonsense mutation in SCN9A in a Moroccan child with congenital insensitivity to pain. Pediatr Neurol 2014; 51:741-4. [PMID: 25439579 DOI: 10.1016/j.pediatrneurol.2014.06.009] [Citation(s) in RCA: 14] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/26/2014] [Revised: 06/12/2014] [Accepted: 06/14/2014] [Indexed: 11/25/2022]
Abstract
BACKGROUND Congenital insensitivity to pain is a rare autosomal recessive disease. Individuals who are diagnosed with congenital insensitivity to pain usually present severely impaired pain perception, and in some cases, they also manifest a decreased sense of smell (anosmia). This disease is caused by loss of function mutations affecting the SCN9A gene, which encodes the voltage-gated sodium channel Nav1.7. It is noteworthy that nearly every mutation linking this particular channel to congenital insensitivity to pain has been demonstrated to underlie the translation of a truncated protein. METHODS Complete sequencing of the SCN9A gene in a Moroccan 3-year-old child with congenital insensitivity to pain. RESULT We identified a homozygous nonsense mutation (c.4795C>T) in exon 27, that results in codon stop in the amino acid (p.R1599X). CONCLUSION In this report we present a previously unreported homozygous nonsense mutation present in a consanguineous Moroccan congenital insensitivity to pain patient with anosmia. The identification of this mutation extends the spectrum of mutations affecting the Nav1.7 channel, and it confirms earlier studies that established Nav1.7 roles in nociception and the sense of smell.
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Affiliation(s)
- Maria Mansouri
- Département de Génétique Médicale, Institut National d'Hygiène, Rabat, Morocco.
| | | | - Bouchra Ouled Amar Bencheikh
- Neurology and Neurosurgery Department, McGill University, Montréal, Quebec, Canada; Pathology and Cell Biology, Université de Montréal, Montréal, Quebec, Canada
| | - Mohamed El Alloussi
- Service d'odontologie pédiatrique, Faculté de médecine dentaire, Université Mohammed V Souissi, Rabat, Morocco
| | - Patrick A Dion
- Neurology and Neurosurgery Department, McGill University, Montréal, Quebec, Canada; Pathology and Cell Biology, Université de Montréal, Montréal, Quebec, Canada
| | - Abdelaziz Sefiani
- Département de Génétique Médicale, Institut National d'Hygiène, Rabat, Morocco; Centre de génomique humaine, Faculté de Médecine et de Pharmacie de Rabat, Université Mohammed V Souissi, Rabat, Morocco
| | - Guy A Rouleau
- Neurology and Neurosurgery Department, McGill University, Montréal, Quebec, Canada; Montreal Neurological Institute and Hospital, McGill University, Montréal, Quebec, Canada
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14
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Baulac S, Lenk GM, Dufresnois B, Ouled Amar Bencheikh B, Couarch P, Renard J, Larson PA, Ferguson CJ, Noé E, Poirier K, Hubans C, Ferreira S, Guerrini R, Ouazzani R, El Hachimi KH, Meisler MH, Leguern E. Role of the phosphoinositide phosphatase FIG4 gene in familial epilepsy with polymicrogyria. Neurology 2014; 82:1068-75. [PMID: 24598713 DOI: 10.1212/wnl.0000000000000241] [Citation(s) in RCA: 84] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
OBJECTIVE The aim of this study was to identify the causal gene in a consanguineous Moroccan family with temporo-occipital polymicrogyria, psychiatric manifestations, and epilepsy, previously mapped to the 6q16-q22 region. METHODS We used exome sequencing and analyzed candidate variants in the 6q16-q22 locus, as well as a rescue assay in Fig4-null mouse fibroblasts and immunohistochemistry of Fig4-null mouse brains. RESULTS A homozygous missense mutation (p.Asp783Val) in the phosphoinositide phosphatase gene FIG4 was identified. Pathogenicity of the variant was supported by impaired rescue of the enlarged vacuoles in transfected fibroblasts from Fig4-deficient mice. Histologic examination of Fig4-null mouse brain revealed neurodevelopmental impairment in the hippocampus, cortex, and cerebellum as well as impaired cerebellar gyration/foliation reminiscent of human cortical malformations. CONCLUSIONS This study extends the spectrum of phenotypes associated with FIG4 mutations to include cortical malformation associated with seizures and psychiatric manifestations, in addition to the previously described Charcot-Marie-Tooth disease type 4J and Yunis-Varón syndrome.
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Affiliation(s)
- Stéphanie Baulac
- From INSERM (S.B., B.D., B.O.A.B., P.C., J.R., E.N., K.H.E.H., E.L.), U1127; Sorbonne Universités, UPMC Univ Paris 06 (S.B., B.D., B.O.A.B., P.C., J.R., E.N., K.H.E.H., E.L.), UM 75; CNRS (S.B., B.D., B.O.A.B., P.C., J.R., E.N., K.H.E.H., E.L.), UMR 7225, ICM, Paris, ICM, (S.B., B.D., B.O.A.B., P.C., J.R., E.N., K.H.E.H., E.L.) Paris, F-75013 Paris, France; Department of Human Genetics (G.M.L., P.A.L., C.J.F., M.H.M.), University of Michigan, Ann Arbor; Service de Neurophysiologie Clinique (B.O.A.B.), Hôpital des Spécialités, Centre Hospitalier Ibn Sina Rabat, Morocco; Genetics and Pathophysiology of Neurodevelopmental and Neuromuscular Diseases (K.P.), Cochin Institute, Paris; GenoScreen (C.H., S.F.), Lille, France; Neuroscience Department (R.G.), Children's Hospital A. Meyer, University of Florence and IRCCS Stella Maris, Pisa, Italy; Laboratoire de Neurogénétique (K.H.E.H.), Ecole Pratique des Hautes Etudes, Paris; and Département de Génétique et de Cytogénétique (E.L.), AP-HP Groupe hospitalier Pitié-Salpêtrière, Paris, France
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15
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Capo-Chichi JM, Tcherkezian J, Hamdan FF, Décarie JC, Dobrzeniecka S, Patry L, Nadon MA, Mucha BE, Major P, Shevell M, Bencheikh BOA, Joober R, Samuels ME, Rouleau GA, Roux PP, Michaud JL. Disruption of TBC1D7, a subunit of the TSC1-TSC2 protein complex, in intellectual disability and megalencephaly. J Med Genet 2013; 50:740-4. [DOI: 10.1136/jmedgenet-2013-101680] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
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16
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Salzmann A, Guipponi M, Lyons PJ, Fricker LD, Sapio M, Lambercy C, Buresi C, Ouled Amar Bencheikh B, Lahjouji F, Ouazzani R, Crespel A, Chaigne D, Malafosse A. Carboxypeptidase A6 gene (CPA6) mutations in a recessive familial form of febrile seizures and temporal lobe epilepsy and in sporadic temporal lobe epilepsy. Hum Mutat 2011; 33:124-35. [DOI: 10.1002/humu.21613] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2011] [Accepted: 08/25/2011] [Indexed: 11/10/2022]
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