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Holanda IP, Rim PHH, Guaragna MS, Gil-da-Silva-Lopes VL, Steiner CE. Syndromic Retinitis Pigmentosa: A 15-Patient Study. Genes (Basel) 2024; 15:516. [PMID: 38674450 PMCID: PMC11050127 DOI: 10.3390/genes15040516] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2024] [Revised: 04/17/2024] [Accepted: 04/19/2024] [Indexed: 04/28/2024] Open
Abstract
Retinitis pigmentosa is a group of genetically determined retinal dystrophies characterized by primary photoreceptor apoptosis and can occur in isolated or syndromic conditions. This study reviewed the clinical data of 15 patients with syndromic retinitis pigmentosa from a Rare Disease Reference Center in Brazil and the results of their next-generation sequencing tests. Five males and ten females participated, with the mean ages for ocular disease onset, fundoscopic diagnosis, and molecular evaluation being 9, 19, and 29 years, respectively. Bardet-Biedl syndrome (n = 5) and Usher syndrome (n = 3) were the most frequent diagnoses, followed by other rare conditions. Among the patients, fourteen completed molecular studies, with three negative results and eleven revealing findings in known genes, including novel variants in MKKS (c.432_435del, p.Phe144Leufs*14), USH2A (c.(7301+1_7302-1)_(9369+1_9370-1)del), and CEP250 (c.5383dup, p.Glu1795Glyfs*13, and c.5050del, p.Asp1684Thrfs*9). Except for Kearn-Sayre, all presented an autosomal recessive inheritance pattern with 64% homozygosity results. The long gap between symptom onset and diagnosis highlights the diagnostic challenges faced by the patients. This study reaffirms the clinical heterogeneity of syndromic retinitis pigmentosa and underscores the pivotal role of molecular analysis in advancing our understanding of these diseases.
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Affiliation(s)
- Ianne Pessoa Holanda
- Genética Médica e Medicina Genômica, Departamento de Medicina Translacional, Faculdade de Ciências Médicas, Universidade Estadual de Campinas (Unicamp), Campinas 13083-888, SP, Brazil; (I.P.H.); (M.S.G.); (V.L.G.-d.-S.-L.)
| | - Priscila Hae Hyun Rim
- Ambulatório de Genética Ocular, Departamento de Oftalmologia e Otorrinolaringologia, Faculdade de Ciências Médicas, Universidade Estadual de Campinas (Unicamp), Campinas 13083-888, SP, Brazil;
| | - Rare Genomes Project Consortium
- Serviço de Genética Molecular, Departamento de Medicina Laboratorial, Hospital Israelita Albert Einstein (HIAE), São Paulo 05652-900, SP, Brazil
| | - Mara Sanches Guaragna
- Genética Médica e Medicina Genômica, Departamento de Medicina Translacional, Faculdade de Ciências Médicas, Universidade Estadual de Campinas (Unicamp), Campinas 13083-888, SP, Brazil; (I.P.H.); (M.S.G.); (V.L.G.-d.-S.-L.)
| | - Vera Lúcia Gil-da-Silva-Lopes
- Genética Médica e Medicina Genômica, Departamento de Medicina Translacional, Faculdade de Ciências Médicas, Universidade Estadual de Campinas (Unicamp), Campinas 13083-888, SP, Brazil; (I.P.H.); (M.S.G.); (V.L.G.-d.-S.-L.)
| | - Carlos Eduardo Steiner
- Genética Médica e Medicina Genômica, Departamento de Medicina Translacional, Faculdade de Ciências Médicas, Universidade Estadual de Campinas (Unicamp), Campinas 13083-888, SP, Brazil; (I.P.H.); (M.S.G.); (V.L.G.-d.-S.-L.)
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2
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Bea-Mascato B, Valverde D. Genotype-phenotype associations in Alström syndrome: a systematic review and meta-analysis. J Med Genet 2023; 61:18-26. [PMID: 37321834 PMCID: PMC10803979 DOI: 10.1136/jmg-2023-109175] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2023] [Accepted: 05/29/2023] [Indexed: 06/17/2023]
Abstract
BACKGROUND Alström syndrome (ALMS; #203800) is an ultrarare monogenic recessive disease. This syndrome is associated with variants in the ALMS1 gene, which encodes a centrosome-associated protein involved in the regulation of several ciliary and extraciliary processes, such as centrosome cohesion, apoptosis, cell cycle control and receptor trafficking. The type of variant associated with ALMS is mostly complete loss-of-function variants (97%) and they are mainly located in exons 8, 10 and 16 of the gene. Other studies in the literature have tried to establish a genotype-phenotype correlation in this syndrome with limited success. The difficulty in recruiting a large cohort in rare diseases is the main barrier to conducting this type of study. METHODS In this study we collected all cases of ALMS published to date. We created a database of patients who had a genetic diagnosis and an individualised clinical history. Lastly, we attempted to establish a genotype-phenotype correlation using the truncation site of the patient's longest allele as a grouping criteria. RESULTS We collected a total of 357 patients, of whom 227 had complete clinical information, complete genetic diagnosis and meta-information on sex and age. We have seen that there are five variants with high frequency, with p.(Arg2722Ter) being the most common variant, with 28 alleles. No gender differences in disease progression were detected. Finally, truncating variants in exon 10 seem to be correlated with a higher prevalence of liver disorders in patients with ALMS. CONCLUSION Pathogenic variants in exon 10 of the ALMS1 gene were associated with a higher prevalence of liver disease. However, the location of the variant in the ALMS1 gene does not have a major impact on the phenotype developed by the patient.
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Affiliation(s)
- Brais Bea-Mascato
- CINBIO, Universidad de Vigo, 36310 Vigo, Spain
- Grupo de Investigación en Enfermedades Raras y Medicina Pediátrica, Instituto de Investigación Sanitaria Galicia Sur (IIS Galicia Sur), SERGAS-UVIGO, Vigo, Spain
| | - Diana Valverde
- CINBIO, Universidad de Vigo, 36310 Vigo, Spain
- Grupo de Investigación en Enfermedades Raras y Medicina Pediátrica, Instituto de Investigación Sanitaria Galicia Sur (IIS Galicia Sur), SERGAS-UVIGO, Vigo, Spain
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3
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Khan S, Focșa IO, Budișteanu M, Stoica C, Nedelea F, Bohîlțea L, Caba L, Butnariu L, Pânzaru M, Rusu C, Jurcă C, Chirita-Emandi A, Bănescu C, Abbas W, Sadeghpour A, Baig SM, Bălgrădean M, Davis EE. Exome sequencing in a Romanian Bardet-Biedl syndrome cohort revealed an overabundance of causal BBS12 variants. Am J Med Genet A 2023; 191:2376-2391. [PMID: 37293956 PMCID: PMC10524726 DOI: 10.1002/ajmg.a.63322] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2023] [Revised: 05/16/2023] [Accepted: 05/26/2023] [Indexed: 06/10/2023]
Abstract
Bardet-Biedl syndrome (BBS), is an emblematic ciliopathy hallmarked by pleiotropy, phenotype variability, and extensive genetic heterogeneity. BBS is a rare (~1/140,000 to ~1/160,000 in Europe) autosomal recessive pediatric disorder characterized by retinal degeneration, truncal obesity, polydactyly, cognitive impairment, renal dysfunction, and hypogonadism. Twenty-eight genes involved in ciliary structure or function have been implicated in BBS, and explain the molecular basis for ~75%-80% of individuals. To investigate the mutational spectrum of BBS in Romania, we ascertained a cohort of 24 individuals in 23 families. Following informed consent, we performed proband exome sequencing (ES). We detected 17 different putative disease-causing single nucleotide variants or small insertion-deletions and two pathogenic exon disruptive copy number variants in known BBS genes in 17 pedigrees. The most frequently impacted genes were BBS12 (35%), followed by BBS4, BBS7, and BBS10 (9% each) and BBS1, BBS2, and BBS5 (4% each). Homozygous BBS12 p.Arg355* variants were present in seven pedigrees of both Eastern European and Romani origin. Our data show that although the diagnostic rate of BBS in Romania is likely consistent with other worldwide cohorts (74%), we observed a unique distribution of causal BBS genes, including overrepresentation of BBS12 due to a recurrent nonsense variant, that has implications for regional diagnostics.
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Affiliation(s)
- Sheraz Khan
- Stanley Manne Children's Research Institute, Ann & Robert H. Lurie Children's Hospital of Chicago, Chicago, Illinois, USA
- Human Molecular Genetics Lab, Health Biotechnology Division, National Institute for Biotechnology and Genetic Engineering (NIBGE-C), Faisalabad, Pakistan
- Pakistan Institute of Engineering and Applied Sciences (PIEAS), Islamabad, Pakistan
| | - Ina Ofelia Focșa
- University of Medicine and Pharmacy "Carol Davila", Bucharest, Romania
- Cytogenomic Medical Laboratory, Bucharest, Romania
| | - Magdalena Budișteanu
- Psychiatry Research Laboratory, "Prof. Dr. Alexandru Obregia" Clinical Hospital of Psychiatry, Bucharest, Romania
- Medical Genetic Laboratory, "Victor Babeș" National Institute of Pathology, Bucharest, Romania
- Department of Medical Genetics, Faculty of Medicine, "Titu Maiorescu" University, Bucharest, Romania
| | - Cristina Stoica
- University of Medicine and Pharmacy "Carol Davila", Bucharest, Romania
- Department of Pediatrics, Clinical Institute Fundeni, Bucharest, Romania
| | - Florina Nedelea
- University of Medicine and Pharmacy "Carol Davila", Bucharest, Romania
- Genetics Department, Clinical Hospital Filantropia, Bucharest, Romania
| | | | - Lavinia Caba
- Department of Medical Genetics, "Grigore T. Popa" University of Medicine and Pharmacy, Iași, Romania
| | - Lăcrămioara Butnariu
- Department of Medical Genetics, "Grigore T. Popa" University of Medicine and Pharmacy, Iași, Romania
- Regional Medical Genetics Centre, "Sf. Maria" Children's Hospital, Iași, Romania
| | - Monica Pânzaru
- Department of Medical Genetics, "Grigore T. Popa" University of Medicine and Pharmacy, Iași, Romania
- Regional Medical Genetics Centre, "Sf. Maria" Children's Hospital, Iași, Romania
| | - Cristina Rusu
- Department of Medical Genetics, "Grigore T. Popa" University of Medicine and Pharmacy, Iași, Romania
- Regional Medical Genetics Centre, "Sf. Maria" Children's Hospital, Iași, Romania
| | - Claudia Jurcă
- Department of Genetics, Faculty of Medicine and Pharmacy, University of Oradea, Oradea, Romania
- Department of Pediatrics, "Dr. Gavril Curteanu" Municipal Clinical Hospital, Oradea, Romania
| | - Adela Chirita-Emandi
- Emergency Hospital for Children Louis Turcanu, Regional Center of Medical Genetics Timis, Timisoara, Romania
- Victor Babes University of Medicine and Pharmacy Timisoara, Department of Microscopic Morphology Genetics, Center for Genomic Medicine, Timisoara, Romania
| | - Claudia Bănescu
- "George Emil Palade" University of Medicine, Pharmacy, Sciences and Technology, Târgu Mureş, Romania
| | - Wasim Abbas
- Human Molecular Genetics Lab, Health Biotechnology Division, National Institute for Biotechnology and Genetic Engineering (NIBGE-C), Faisalabad, Pakistan
- Pakistan Institute of Engineering and Applied Sciences (PIEAS), Islamabad, Pakistan
| | - Azita Sadeghpour
- Center for Human Disease Modeling, Duke University Medical Center, Durham, North Carolina, USA
- Duke Precision Medicine Program, Department of Medicine, Division of General Internal Medicine, Duke University Medical Center, Durham, NC, USA
| | - Shahid Mahmood Baig
- Pakistan Science Foundation (PSF), Islamabad, Pakistan
- Department of Biological and Biomedical Sciences, Agha Khan University Karachi, Karachi, Pakistan
| | - Mihaela Bălgrădean
- University of Medicine and Pharmacy "Carol Davila", Bucharest, Romania
- Department of Pediatrics and Pediatric Nephrology, Emergency Clinical Hospital for Children "Maria Skłodowska Curie", Bucharest, Romania
| | - Erica E Davis
- Stanley Manne Children's Research Institute, Ann & Robert H. Lurie Children's Hospital of Chicago, Chicago, Illinois, USA
- Department of Pediatrics and Department of Cell and Developmental Biology, Feinberg School of Medicine, Northwestern University, Chicago, Illinois, USA
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4
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Karam A, Delvallée C, Estrada-Cuzcano A, Geoffroy V, Lamouche JB, Leuvrey AS, Nourisson E, Tarabeux J, Stoetzel C, Scheidecker S, Porter LF, Génin E, Redon R, Sandron F, Boland A, Deleuze JF, Le May N, Dollfus H, Muller J. WGS Revealed Novel BBS5 Pathogenic Variants, Missed by WES, Causing Ciliary Structure and Function Defects. Int J Mol Sci 2023; 24:8729. [PMID: 37240074 PMCID: PMC10218572 DOI: 10.3390/ijms24108729] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2023] [Revised: 04/18/2023] [Accepted: 04/24/2023] [Indexed: 05/28/2023] Open
Abstract
Bardet-Biedl syndrome (BBS) is an autosomal recessive ciliopathy that affects multiple organs, leading to retinitis pigmentosa, polydactyly, obesity, renal anomalies, cognitive impairment, and hypogonadism. Until now, biallelic pathogenic variants have been identified in at least 24 genes delineating the genetic heterogeneity of BBS. Among those, BBS5 is a minor contributor to the mutation load and is one of the eight subunits forming the BBSome, a protein complex implied in protein trafficking within the cilia. This study reports on a European BBS5 patient with a severe BBS phenotype. Genetic analysis was performed using multiple next-generation sequencing (NGS) tests (targeted exome, TES and whole exome, WES), and biallelic pathogenic variants could only be identified using whole-genome sequencing (WGS), including a previously missed large deletion of the first exons. Despite the absence of family samples, the biallelic status of the variants was confirmed. The BBS5 protein's impact was confirmed on the patient's cells (presence/absence and size of the cilium) and ciliary function (Sonic Hedgehog pathway). This study highlights the importance of WGS and the challenge of reliable structural variant detection in patients' genetic explorations as well as functional tests to assess a variant's pathogenicity.
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Affiliation(s)
- Adella Karam
- Laboratoire de Génétique Médicale, UMR_S INSERM U1112, Institut de Génétique Médicale d’Alsace (IGMA), Faculté de Médecine FMTS, Université de Strasbourg, 67000 Strasbourg, France
| | - Clarisse Delvallée
- Laboratoire de Génétique Médicale, UMR_S INSERM U1112, Institut de Génétique Médicale d’Alsace (IGMA), Faculté de Médecine FMTS, Université de Strasbourg, 67000 Strasbourg, France
| | - Alejandro Estrada-Cuzcano
- Laboratoire de Génétique Médicale, UMR_S INSERM U1112, Institut de Génétique Médicale d’Alsace (IGMA), Faculté de Médecine FMTS, Université de Strasbourg, 67000 Strasbourg, France
| | - Véronique Geoffroy
- Laboratoire de Génétique Médicale, UMR_S INSERM U1112, Institut de Génétique Médicale d’Alsace (IGMA), Faculté de Médecine FMTS, Université de Strasbourg, 67000 Strasbourg, France
| | - Jean-Baptiste Lamouche
- Laboratoire de Génétique Médicale, UMR_S INSERM U1112, Institut de Génétique Médicale d’Alsace (IGMA), Faculté de Médecine FMTS, Université de Strasbourg, 67000 Strasbourg, France
| | - Anne-Sophie Leuvrey
- Laboratoires de Diagnostic Génétique, Hôpitaux Universitaires de Strasbourg, 67000 Strasbourg, France (E.N.)
| | - Elsa Nourisson
- Laboratoires de Diagnostic Génétique, Hôpitaux Universitaires de Strasbourg, 67000 Strasbourg, France (E.N.)
| | - Julien Tarabeux
- Laboratoires de Diagnostic Génétique, Hôpitaux Universitaires de Strasbourg, 67000 Strasbourg, France (E.N.)
| | - Corinne Stoetzel
- Laboratoire de Génétique Médicale, UMR_S INSERM U1112, Institut de Génétique Médicale d’Alsace (IGMA), Faculté de Médecine FMTS, Université de Strasbourg, 67000 Strasbourg, France
| | - Sophie Scheidecker
- Laboratoire de Génétique Médicale, UMR_S INSERM U1112, Institut de Génétique Médicale d’Alsace (IGMA), Faculté de Médecine FMTS, Université de Strasbourg, 67000 Strasbourg, France
- Laboratoires de Diagnostic Génétique, Hôpitaux Universitaires de Strasbourg, 67000 Strasbourg, France (E.N.)
| | - Louise Frances Porter
- Laboratoire de Génétique Médicale, UMR_S INSERM U1112, Institut de Génétique Médicale d’Alsace (IGMA), Faculté de Médecine FMTS, Université de Strasbourg, 67000 Strasbourg, France
- Centre de Référence Pour les Affections Rares en Génétique Ophtalmologique (CARGO), Institut de Génétique Médicale d’Alsace (IGMA), Filière SENSGENE, Hôpitaux Universitaires de Strasbourg, 67091 Strasbourg, France
| | - Emmanuelle Génin
- Inserm, Université de Brest, EFS, UMR 1078, GGB, F-29200 Brest, France
| | - Richard Redon
- CHU Nantes, CNRS, INSERM, L’institut du Thorax, Nantes Université, 44000 Nantes, France
| | - Florian Sandron
- CEA, Centre National de Recherche en Génomique Humaine, Université Paris-Saclay, 91057 Evry, France
| | - Anne Boland
- CEA, Centre National de Recherche en Génomique Humaine, Université Paris-Saclay, 91057 Evry, France
| | - Jean-François Deleuze
- CEA, Centre National de Recherche en Génomique Humaine, Université Paris-Saclay, 91057 Evry, France
| | - Nicolas Le May
- Laboratoire de Génétique Médicale, UMR_S INSERM U1112, Institut de Génétique Médicale d’Alsace (IGMA), Faculté de Médecine FMTS, Université de Strasbourg, 67000 Strasbourg, France
| | - Hélène Dollfus
- Laboratoire de Génétique Médicale, UMR_S INSERM U1112, Institut de Génétique Médicale d’Alsace (IGMA), Faculté de Médecine FMTS, Université de Strasbourg, 67000 Strasbourg, France
- Centre de Référence Pour les Affections Rares en Génétique Ophtalmologique (CARGO), Institut de Génétique Médicale d’Alsace (IGMA), Filière SENSGENE, Hôpitaux Universitaires de Strasbourg, 67091 Strasbourg, France
- Service de Génétique Médicale, Institut de Génétique Médicale d’Alsace (IGMA), Hôpitaux Universitaires de Strasbourg, 67000 Strasbourg, France
| | - Jean Muller
- Laboratoire de Génétique Médicale, UMR_S INSERM U1112, Institut de Génétique Médicale d’Alsace (IGMA), Faculté de Médecine FMTS, Université de Strasbourg, 67000 Strasbourg, France
- Laboratoires de Diagnostic Génétique, Hôpitaux Universitaires de Strasbourg, 67000 Strasbourg, France (E.N.)
- Unité Fonctionnelle de Bioinformatique Médicale Appliquée au Diagnostic (UF7363), Hôpitaux Universitaires de Strasbourg, 67000 Strasbourg, France
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Mizumoto K, Kato K, Fujinami K, Sugita T, Sugita I, Hattori A, Saitoh S, Ueno S, Tsunoda K, Iwata T, Kondo M. A Japanese boy with Bardet-Biedl syndrome caused by a novel homozygous variant in the ARL6 gene who was initially diagnosed with retinitis punctata albescens: A case report. Medicine (Baltimore) 2022; 101:e32161. [PMID: 36550847 PMCID: PMC9771268 DOI: 10.1097/md.0000000000032161] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
Abstract
PURPOSE Bardet-Biedl Syndrome (BBS) is an autosomal recessive systemic disorder characterized by retinitis pigmentosa, polydactyly, obesity, intellectual disability, renal impairments, and hypogonadism. The purpose of this study was to determine the ocular characteristics of a boy with BBS caused by a novel homozygous variant in the ARL6 (alternative named BBS3) gene who had been originally diagnosed with retinitis punctata albescens. METHODS This was an observational case study. The patient underwent ophthalmological examinations, electroretinography, and genetic analyses using whole-exome sequencing. RESULTS A 7-year-old boy was examined in our hospital with complaints of a progressive reduction of his visual acuity and night blindness in both eyes. There was no family history of eye diseases and no consanguineous marriage. Fundus examinations showed numerous white spots in the deep retina and retinal pigment epithelium. Fundus autofluorescence showed hypofluorescence consistent with these spots. Both the scotopic and photopic components of the full-field electroretinographies were non-detectable. Based on these clinical findings, this boy was suspected to have retinitis punctata albescens. Subsequent genetic testing using whole-exome sequencing revealed a novel homozygous variants in the ARL6/BBS3 gene (NM_001278293.3:c.528G>A, (p.Trp176Ter)). A systemic examination by the pediatric department revealed that this boy had a history of a surgical excision of polydactyly on his left foot when he was born, and that he was mildly obese. There were no prominent intellectual or gonadal dysfunctions, no craniofacial or dental abnormalities, no congenital heart disease, and no hearing impairment. He was then clinically and genetically diagnosed with BBS. CONCLUSION AND IMPORTANCE In children with night blindness and progressive visual dysfunction, it is important for ophthalmologists to consult clinical geneticists and pediatricians to rule out the possibility of systemic diseases such as BBS.
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Affiliation(s)
- Keitaro Mizumoto
- Department of Ophthalmology, Mie University Graduate School of Medicine, Tsu, Japan
| | - Kumiko Kato
- Department of Ophthalmology, Mie University Graduate School of Medicine, Tsu, Japan
- *Correspondence: Kumiko Kato, Department of Ophthalmology, Mie University Graduate School of Medicine, 2-174 Edobashi, Tsu, Mie 514-8507, Japan (e-mail: )
| | - Kaoru Fujinami
- Laboratory of Visual Physiology, Division of Vision Research, National Institute of Sensory Organs, National Hospital Organization Tokyo Medical Center, Tokyo, Japan
- UCL Institute of Ophthalmology, University College London, London, United Kingdom
| | - Tadasu Sugita
- Department of Ophthalmology, Sugita Eye Hospital, Nagoya, Japan
| | - Iichiro Sugita
- Department of Ophthalmology, Sugita Eye Hospital, Nagoya, Japan
| | - Ayako Hattori
- Department of Pediatrics and Neonatology, Graduate School of Medical Sciences, Nagoya City University, Nagoya, Japan
| | - Shinji Saitoh
- Department of Pediatrics and Neonatology, Graduate School of Medical Sciences, Nagoya City University, Nagoya, Japan
| | - Shinji Ueno
- Department of Ophthalmology, Hirosaki University Graduate School of Medicine, Hirosaki, Japan
| | - Kazushige Tsunoda
- Division of Vision Research, National Institute of Sensory Organs, National Hospital Organization Tokyo Medical Center, Tokyo, Japan
| | - Takeshi Iwata
- Division of Molecular and Cellular Biology, National Institute of Sensory Organs, National Hospital Organization Tokyo Medical Center, Tokyo, Japan
| | - Mineo Kondo
- Department of Ophthalmology, Mie University Graduate School of Medicine, Tsu, Japan
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6
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Fabregat M, Niño-Rivero S, Pose S, Cárdenas-Rodríguez M, Bresque M, Hernández K, Prieto-Echagüe V, Schlapp G, Crispo M, Lagos P, Lago N, Escande C, Irigoín F, Badano JL. Generation and characterization of Ccdc28b mutant mice links the Bardet-Biedl associated gene with mild social behavioral phenotypes. PLoS Genet 2022; 18:e1009896. [PMID: 35653384 PMCID: PMC9197067 DOI: 10.1371/journal.pgen.1009896] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2021] [Revised: 06/14/2022] [Accepted: 05/09/2022] [Indexed: 11/30/2022] Open
Abstract
CCDC28B (coiled-coil domain-containing protein 28B) was identified as a modifier in the ciliopathy Bardet-Biedl syndrome (BBS). Our previous work in cells and zebrafish showed that CCDC28B plays a role regulating cilia length in a mechanism that is not completely understood. Here we report the generation of a Ccdc28b mutant mouse using CRISPR/Cas9 (Ccdc28b mut). Depletion of CCDC28B resulted in a mild phenotype. Ccdc28b mut animals i) do not present clear structural cilia affectation, although we did observe mild defects in cilia density and cilia length in some tissues, ii) reproduce normally, and iii) do not develop retinal degeneration or obesity, two hallmark features of reported BBS murine models. In contrast, Ccdc28b mut mice did show clear social interaction defects as well as stereotypical behaviors. This finding is indeed relevant regarding CCDC28B as a modifier of BBS since behavioral phenotypes have been documented in BBS. Overall, this work reports a novel mouse model that will be key to continue evaluating genetic interactions in BBS, deciphering the contribution of CCDC28B to modulate the presentation of BBS phenotypes. In addition, our data underscores a novel link between CCDC28B and behavioral defects, providing a novel opportunity to further our understanding of the genetic, cellular, and molecular basis of these complex phenotypes. BBS is caused by mutations in any one of 22 genes known to date. In some families, BBS can be inherited as an oligogenic trait whereby mutations in more than one BBS gene collaborate in the presentation of the syndrome. In addition, CCDC28B was originally identified as a modifier of BBS, whereby a reduction in CCDC28B levels was associated with a more severe presentation of the syndrome. Different mechanisms, all relying on functional redundancy, have been proposed to explain these genetic interactions. The characterization of BBS proteins supported this functional redundancy hypothesis: BBS proteins play a role in cilia maintenance/function and subsets of BBS proteins can even interact directly in multiprotein complexes. We have previously shown that CCDC28B also participates in cilia biology regulating the length of the organelle: knockdown of CCDC28B in cells results in cilia shortening and targeting ccdc28b in zebrafish also results in early embryonic phenotypes characteristic of other cilia mutants. In this work, we generated a Ccdc28b mutant mouse to determine whether abrogating Ccdc28b function would be sufficient to cause a ciliopathy phenotype in mammals, and to generate a tool to continue dissecting its modifying role in the context of BBS. Overall, Ccdc28b mutant mice presented a mild phenotype, a finding fully compatible with its role as a modifier, rather than a causal BBS gene. In addition, we found that Ccdc28b mutants showed behavioral phenotypes, similar to the deficits observed in rodent autism spectrum disorder (ASD) models. Thus, our results underscore a novel causal link between CCDC28B and behavioral phenotypes in mice.
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Affiliation(s)
- Matías Fabregat
- Human Molecular Genetics Laboratory, Institut Pasteur de Montevideo, Montevideo, Uruguay
- INDICyO Institutional Program, Institut Pasteur de Montevideo, Montevideo, Uruguay
| | - Sofía Niño-Rivero
- Departamento de Fisiología, Universidad de la República, Montevideo, Uruguay
| | - Sabrina Pose
- Neuroinflammation and Gene Therapy Laboratory, Institut Pasteur de Montevideo, Montevideo, Uruguay
| | - Magdalena Cárdenas-Rodríguez
- Human Molecular Genetics Laboratory, Institut Pasteur de Montevideo, Montevideo, Uruguay
- INDICyO Institutional Program, Institut Pasteur de Montevideo, Montevideo, Uruguay
| | - Mariana Bresque
- INDICyO Institutional Program, Institut Pasteur de Montevideo, Montevideo, Uruguay
- Metabolic Diseases and Aging Laboratory, Institut Pasteur de Montevideo, Montevideo, Uruguay
| | - Karina Hernández
- Departamento de Histología y Embriología, Facultad de Medicina, Universidad de la República, Montevideo, Uruguay
| | - Victoria Prieto-Echagüe
- Human Molecular Genetics Laboratory, Institut Pasteur de Montevideo, Montevideo, Uruguay
- INDICyO Institutional Program, Institut Pasteur de Montevideo, Montevideo, Uruguay
| | - Geraldine Schlapp
- Laboratory Animal Biotechnology Unit, Institut Pasteur de Montevideo, Montevideo, Uruguay
| | - Martina Crispo
- Laboratory Animal Biotechnology Unit, Institut Pasteur de Montevideo, Montevideo, Uruguay
| | - Patricia Lagos
- Departamento de Fisiología, Universidad de la República, Montevideo, Uruguay
| | - Natalia Lago
- Neuroinflammation and Gene Therapy Laboratory, Institut Pasteur de Montevideo, Montevideo, Uruguay
| | - Carlos Escande
- INDICyO Institutional Program, Institut Pasteur de Montevideo, Montevideo, Uruguay
- Metabolic Diseases and Aging Laboratory, Institut Pasteur de Montevideo, Montevideo, Uruguay
| | - Florencia Irigoín
- Human Molecular Genetics Laboratory, Institut Pasteur de Montevideo, Montevideo, Uruguay
- INDICyO Institutional Program, Institut Pasteur de Montevideo, Montevideo, Uruguay
- Departamento de Histología y Embriología, Facultad de Medicina, Universidad de la República, Montevideo, Uruguay
- * E-mail: (FI); (JLB)
| | - Jose L. Badano
- Human Molecular Genetics Laboratory, Institut Pasteur de Montevideo, Montevideo, Uruguay
- INDICyO Institutional Program, Institut Pasteur de Montevideo, Montevideo, Uruguay
- * E-mail: (FI); (JLB)
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7
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Sloboda N, Lambert L, Ciorna V, Bruel AL, Tran Mau-Them F, Gomola V, Lemelle JL, Klein O, Camoin-Schweitzer MC, Magnavacca M, Legagneur C, Ezsto ML, Bonnet C, Philippe C, Leheup B. Atypical phenotype of a patient with Bardet-Biedl syndrome type 4. Mol Genet Genomic Med 2022; 10:e1869. [PMID: 35318824 PMCID: PMC9034675 DOI: 10.1002/mgg3.1869] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2020] [Revised: 06/16/2021] [Accepted: 12/14/2021] [Indexed: 12/03/2022] Open
Abstract
Background Bardet–Biedl syndrome (BBS) is a multisystemic disorder characterized by rod–cone dystrophy, truncal obesity, postaxial polydactyly, cognitive impairment, male hypogonadotropic hypogonadism, complex female genitourinary malformations, and renal abnormalities. There is a large clinical and also genetic heterogeneity in BBS. Here, we report a patient with polydactyly, hyperechogenic kidneys increased in size with normal corticomedullary differentiation, anal imperforation, and malformation of genitals with presence of a genital tubercle with ventral urethral meatus associated with two unfused lateral genital swelling and absent urethral folds, in the context of 46, XY karyotype. Methods Karyotype and solo exome sequencing were performed to look for a genetic etiology for the features described in our patient. Results We identified a homozygous in‐frame deletion of exons 4 to 6 in the BBS4 gene (NM‐033028 (BBS4‐i001): c.[(157‐?)_(405 +?)del] p.(Ala53‐Trp135del), which is classified as pathogenic variant. This analysis allowed the molecular diagnosis of BBS type 4 in this patient. Conclusion Complex genital malformations are only reported in female BBS6 patients yet, and genital abnormalities and anal imperforation are not reported in male BBS4 patients to date. We discuss the possible hypotheses for this phenotype, including the phenotypic overlap between ciliopathies.
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Affiliation(s)
| | | | | | - Ange-Line Bruel
- Laboratoire de génétique, Innovation en diagnostic génomique des maladies rares UF6254, Plate-forme de Biologie Hospitalo-Universitaire, CHU Dijon, Dijon, France
| | - Frédéric Tran Mau-Them
- Laboratoire de génétique, Innovation en diagnostic génomique des maladies rares UF6254, Plate-forme de Biologie Hospitalo-Universitaire, CHU Dijon, Dijon, France.,INSERM U1231, LNC UMR1231 GAD, Université de Bourgogne, Dijon, France
| | - Vladimir Gomola
- Service de Chirurgie Viscérale Infantile, CHRU Nancy, Nancy, France
| | | | - Olivier Klein
- Service de Neurochirurgie Pédiatrique, CHRU Nancy, Nancy, France
| | | | - Marie Magnavacca
- Service de néphrologie pédiatrique, dialyse, transplantation rénale, CHRU Nancy, Nancy, France
| | - Carole Legagneur
- Unité d'Endocrinologie Pédiatrique et Diabétologie, CHRU Nancy, Nancy, France
| | | | | | - Christophe Philippe
- Laboratoire de génétique, Innovation en diagnostic génomique des maladies rares UF6254, Plate-forme de Biologie Hospitalo-Universitaire, CHU Dijon, Dijon, France.,INSERM U1231, LNC UMR1231 GAD, Université de Bourgogne, Dijon, France
| | - Bruno Leheup
- Service de Génétique Clinique, CHRU Nancy, Nancy, France
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8
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Jabalameli MR, Briceno I, Martinez J, Briceno I, Pengelly RJ, Ennis S, Collins A. Aarskog-Scott syndrome: phenotypic and genetic heterogeneity. AIMS GENETICS 2021. [DOI: 10.3934/genet.2016.1.49] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
AbstractAarskog-Scott syndrome (AAS) is a rare developmental disorder which primarily affects males and has a relative prevalence of 1 in 25,000 in the general population. AAS patients usually present with developmental complications including short stature and facial, skeletal and urogenital anomalies. The spectrum of genotype-phenotype correlations in AAS is unclear and mutations of the FGD1 gene on the proximal short arm of chromosome X account for only 20% of the incidence of the disorder. Failure to identify pathogenic variants in patients referred for FGD1 screening suggests heterogeneity underlying pathophysiology of the condition. Furthermore, overlapping features of AAS with several other developmental disorders increase the complexity of diagnosis. Cytoskeletal signaling may be involved in the pathophysiology of AAS. The FGD1 protein family has a role in activation of CDC42 (Cell Division Control protein 42 homolog) which has a core function in remodeling of extracellular matrix and the transcriptional activation of many modulators of development. Therefore, mutations in components in the EGFR1 (Epidermal Growth Factor Receptor 1) signaling pathway, to which CDC42 belongs, may contribute to pathophysiology. Parallel sequencing strategies (so-called next generation sequencing or high throughput sequencing) enables simultaneous production of millions of sequencing reads that enormously facilitate cost-effective identification of cryptic mutations in heterogeneous monogenic disorders. Here we review the source of phenotypic and genetic heterogeneity in the context of AAS and discuss the applicability of next generation sequencing for identification of novel mutations underlying AAS.
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Affiliation(s)
- M. Reza Jabalameli
- Genetic Epidemiology & Genomic Informatics, Faculty of Medicine, University of Southampton, Southampton, UK
| | - Ignacio Briceno
- Department of Biomedical Sciences, Medical School, Universidad de La Sabana, Bogota, Colombia
| | - Julio Martinez
- Department of Biomedical Sciences, Medical School, Universidad de La Sabana, Bogota, Colombia
| | - Ignacio Briceno
- Instituto de Genética Humana, Faculty of Medicine, Pontificia Universidad Javeriana, Colombia
| | - Reuben J. Pengelly
- Genetic Epidemiology & Genomic Informatics, Faculty of Medicine, University of Southampton, Southampton, UK
| | - Sarah Ennis
- Genetic Epidemiology & Genomic Informatics, Faculty of Medicine, University of Southampton, Southampton, UK
| | - Andrew Collins
- Genetic Epidemiology & Genomic Informatics, Faculty of Medicine, University of Southampton, Southampton, UK
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9
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Bai Z, Xie Y, Liu L, Shao J, Liu Y, Kong X. Genetic investigation of 211 Chinese families expands the mutational and phenotypical spectra of hereditary retinopathy genes through targeted sequencing technology. BMC Med Genomics 2021; 14:92. [PMID: 33781268 PMCID: PMC8008643 DOI: 10.1186/s12920-021-00935-w] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2020] [Accepted: 03/08/2021] [Indexed: 11/15/2022] Open
Abstract
BACKGROUND Hereditary retinopathy is a significant cause of blindness worldwide. Despite the discovery of many mutations in various retinopathies, a large number of patients remain genetically undiagnosed. Targeted next-generation sequencing of the human genome is a suitable approach for the molecular diagnosis of retinopathy. METHODS We describe a cohort of 211 families from central China with various forms of retinopathy; 95 patients were investigated using multigene panel sequencing, and the other 116 with suspected Leber hereditary optic neuropathy (LHON) were tested by Sanger sequencing. The detected variation of targeted sequencing was verified by PCR-based Sanger sequencing. We performed a comprehensive analysis of the cases using sequencing data and ophthalmologic examination information. RESULTS Potential causal mutations were identified in the majority of families with retinopathy (57.9% of 95 families) and suspected LHON (21.6% of 116 families). There were 68 variants of a certain significance distributed in 31 known disease-causing genes in the 95 families; 37 of the variants are novel and have not been reported to be related to hereditary retinopathy. The NGS panel solution provided a 45.3% potential diagnostic rate for retinopathy families, with candidate gene mutations of undefined pathogenicity revealed in another 12.6%of the families. CONCLUSION Our study uncovered novel mutations and phenotypic aspects of retinopathy and demonstrated the genetic and clinical heterogeneity of related conditions. The findings show the detection rate of pathogenic variants in patients with hereditary retinopathy in central China as well as the diversity and gene distribution of these variants. The significance of molecular genetic testing for patients with hereditary retinopathy is also highlighted.
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Affiliation(s)
- Zhouxian Bai
- The Genetics and Prenatal Diagnosis Center, The Department of Obstetrics and Gynecology, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, 450052, Henan, China
| | - Yanchuan Xie
- The Department of Central Laboratory, The First Affiliated Hospital of Henan University of Science and Technology, Luoyang, 471003, Henan, China
| | - Lina Liu
- The Genetics and Prenatal Diagnosis Center, The Department of Obstetrics and Gynecology, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, 450052, Henan, China
| | - Jingzhi Shao
- The Department of Ophthalmology, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, 450052, Henan, China
| | - Yuying Liu
- The Physical Examination Center, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, 450052, Henan, China
| | - Xiangdong Kong
- The Genetics and Prenatal Diagnosis Center, The Department of Obstetrics and Gynecology, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, 450052, Henan, China.
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10
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X-linked partial corpus callosum agenesis with mild intellectual disability: identification of a novel L1CAM pathogenic variant. Neurogenetics 2021; 22:43-51. [PMID: 33415589 DOI: 10.1007/s10048-020-00629-y] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2020] [Accepted: 11/15/2020] [Indexed: 10/22/2022]
Abstract
Pathogenic variants in L1CAM, the gene encoding the L1 cell adhesion molecule, are responsible for a wide clinical spectrum including X-linked hydrocephalus with stenosis of the Sylvius aqueduct, MASA syndrome (mental retardation, aphasia, shuffling gait, adducted thumbs), and a form of spastic paraplegia (SPG1). A moderate phenotype with mild intellectual disability (ID) and X-linked partial corpus callosum agenesis (CCA) has only been related to L1CAM in one family. We report here a second family, including 5 patients with mild to moderate ID and partial CCA without signs usually associated with L1CAM pathogenic variations (such as hydrocephalus, pyramidal syndrome, thumb adductus, aphasia). We identified a previously unreported c.3226A > C transversion leading to a p.Thr1076Pro amino acid substitution in the fifth fibronectin type III domain (FnIII) of the protein which co-segregates with the phenotype within the family. We performed in vitro assays to assess the pathogenic status of this variation. First, the expression of the novel p.Thr1076Pro mutant in COS7 cells resulted in endoplasmic reticulum (ER) retention and reduced L1CAM cell surface expression, which is expected to affect both L1CAM-mediated cell-cell adhesion and neurite growth. Second, immunoblotting techniques showed that the immature form of the L1CAM protein was increased, indicating that this variation led to a lack of maturation of the protein. ID associated with CCA is not a common clinical presentation of L1CAM pathogenic variants. Genome-wide analyses will identify such variations and it is important to acknowledge this atypical phenotype.
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11
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Delvallée C, Nicaise S, Antin M, Leuvrey AS, Nourisson E, Leitch CC, Kellaris G, Stoetzel C, Geoffroy V, Scheidecker S, Keren B, Depienne C, Klar J, Dahl N, Deleuze JF, Génin E, Redon R, Demurger F, Devriendt K, Mathieu-Dramard M, Poitou-Bernert C, Odent S, Katsanis N, Mandel JL, Davis EE, Dollfus H, Muller J. A BBS1 SVA F retrotransposon insertion is a frequent cause of Bardet-Biedl syndrome. Clin Genet 2020; 99:318-324. [PMID: 33169370 DOI: 10.1111/cge.13878] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2020] [Revised: 11/04/2020] [Accepted: 11/06/2020] [Indexed: 12/11/2022]
Abstract
Bardet-Biedl syndrome (BBS) is a ciliopathy characterized by retinitis pigmentosa, obesity, polydactyly, cognitive impairment and renal failure. Pathogenic variants in 24 genes account for the molecular basis of >80% of cases. Toward saturated discovery of the mutational basis of the disorder, we carefully explored our cohorts and identified a hominid-specific SINE-R/VNTR/Alu type F (SVA-F) insertion in exon 13 of BBS1 in eight families. In six families, the repeat insertion was found in trans with c.1169 T > G, p.Met390Arg and in two families the insertion was found in addition to other recessive BBS loci. Whole genome sequencing, de novo assembly and SNP array analysis were performed to characterize the genomic event. This insertion is extremely rare in the general population (found in 8 alleles of 8 BBS cases but not in >10 800 control individuals from gnomAD-SV) and due to a founder effect. Its 2435 bp sequence contains hallmarks of LINE1 mediated retrotransposition. Functional studies with patient-derived cell lines confirmed that the BBS1 SVA-F is deleterious as evidenced by a significant depletion of both mRNA and protein levels. Such findings highlight the importance of dedicated bioinformatics pipelines to identify all types of variation.
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Affiliation(s)
- Clarisse Delvallée
- Laboratoire de Génétique Médicale, Institut de génétique médicale d'Alsace IGMA, INSERM U1112, Fédération de Médecine Translationnelle de Strasbourg (FMTS), Université de Strasbourg UMRS_1112, Strasbourg, France
| | - Samuel Nicaise
- Laboratoire de Génétique Médicale, Institut de génétique médicale d'Alsace IGMA, INSERM U1112, Fédération de Médecine Translationnelle de Strasbourg (FMTS), Université de Strasbourg UMRS_1112, Strasbourg, France
| | - Manuela Antin
- Laboratoires de Diagnostic Génétique, Hôpitaux Universitaires de Strasbourg, Strasbourg, France
| | - Anne-Sophie Leuvrey
- Laboratoires de Diagnostic Génétique, Hôpitaux Universitaires de Strasbourg, Strasbourg, France
| | - Elsa Nourisson
- Laboratoires de Diagnostic Génétique, Hôpitaux Universitaires de Strasbourg, Strasbourg, France
| | - Carmen C Leitch
- Advanced Center for Translational and Genetic Medicine (ACT-GeM), Stanley Manne Children's Research Institute, Ann and Robert H. Lurie Children's Hospital of Chicago, Chicago, Illinois, USA
| | - Georgios Kellaris
- Advanced Center for Translational and Genetic Medicine (ACT-GeM), Stanley Manne Children's Research Institute, Ann and Robert H. Lurie Children's Hospital of Chicago, Chicago, Illinois, USA
| | - Corinne Stoetzel
- Laboratoire de Génétique Médicale, Institut de génétique médicale d'Alsace IGMA, INSERM U1112, Fédération de Médecine Translationnelle de Strasbourg (FMTS), Université de Strasbourg UMRS_1112, Strasbourg, France
| | - Véronique Geoffroy
- Laboratoire de Génétique Médicale, Institut de génétique médicale d'Alsace IGMA, INSERM U1112, Fédération de Médecine Translationnelle de Strasbourg (FMTS), Université de Strasbourg UMRS_1112, Strasbourg, France
| | - Sophie Scheidecker
- Laboratoire de Génétique Médicale, Institut de génétique médicale d'Alsace IGMA, INSERM U1112, Fédération de Médecine Translationnelle de Strasbourg (FMTS), Université de Strasbourg UMRS_1112, Strasbourg, France.,Laboratoires de Diagnostic Génétique, Hôpitaux Universitaires de Strasbourg, Strasbourg, France
| | - Boris Keren
- Institut du Cerveau et de la Moelle épinière (ICM), Sorbonne Université, Paris, France.,AP-HP, Hôpital de la Pitié-Salpêtrière, Département de Génétique, Paris, France
| | - Christel Depienne
- Institut du Cerveau et de la Moelle épinière (ICM), Sorbonne Université, Paris, France.,Institute of Human Genetics, University Hospital Essen, University of Duisburg-Essen, Essen, Germany
| | - Joakim Klar
- Department of Immunology, Genetics and Pathology, Science for Life Laboratory, Uppsala University, Uppsala, Sweden
| | - Niklas Dahl
- Department of Immunology, Genetics and Pathology, Science for Life Laboratory, Uppsala University, Uppsala, Sweden
| | - Jean-François Deleuze
- Centre National de Recherche en Génomique Humaine (CNRGH), Institut de biologie François Jacob, Evry, France
| | | | - Richard Redon
- Université de Nantes, CNRS, INSERM, l'institut du thorax, Nantes, France
| | - Florence Demurger
- Service de Génétique Médicale, Centre Hospitalier Bretagne Atlantique, Vannes, France
| | - Koenraad Devriendt
- Center for Human Genetics, University Hospital Leuven and KU Leuven, Leuven, Belgium
| | | | - Christine Poitou-Bernert
- Assistance Publique Hôpitaux de Paris, Nutrition Department Pitié-Salpêtrière Hospital; Sorbonne Université, INSERM, NutriOmics Research Unit, Paris, France
| | - Sylvie Odent
- Centre de Référence Maladies Rares CLAD-Ouest, Service de Génétique Clinique, CHU Rennes, Rennes, France.,CNRS, IGDR (Institut de Génétique et Développement de Rennes) UMR 6290, Université de Rennes, Rennes, France
| | - Nicholas Katsanis
- Advanced Center for Translational and Genetic Medicine (ACT-GeM), Stanley Manne Children's Research Institute, Ann and Robert H. Lurie Children's Hospital of Chicago, Chicago, Illinois, USA.,Department of Pediatrics, Feinberg School of Medicine, Northwestern University, Chicago, Illinois, USA
| | - Jean-Louis Mandel
- Laboratoires de Diagnostic Génétique, Hôpitaux Universitaires de Strasbourg, Strasbourg, France.,Institut de Génétique et de Biologie Moléculaire et Cellulaire, CNRS UMR 7104, INSERM U964, Université de Strasbourg, Dept Transl Med and Neurogenetics Illkirch, France
| | - Erica E Davis
- Advanced Center for Translational and Genetic Medicine (ACT-GeM), Stanley Manne Children's Research Institute, Ann and Robert H. Lurie Children's Hospital of Chicago, Chicago, Illinois, USA.,Department of Pediatrics, Feinberg School of Medicine, Northwestern University, Chicago, Illinois, USA
| | - Hélène Dollfus
- Laboratoire de Génétique Médicale, Institut de génétique médicale d'Alsace IGMA, INSERM U1112, Fédération de Médecine Translationnelle de Strasbourg (FMTS), Université de Strasbourg UMRS_1112, Strasbourg, France.,Service de Génétique Médicale, Hôpitaux Universitaires de Strasbourg, Strasbourg, France.,Filière SENSGENE, Centre de Référence pour les affections rares en génétique ophtalmologique, CARGO, Hôpitaux Universitaires de Strasbourg, Strasbourg, France
| | - Jean Muller
- Laboratoire de Génétique Médicale, Institut de génétique médicale d'Alsace IGMA, INSERM U1112, Fédération de Médecine Translationnelle de Strasbourg (FMTS), Université de Strasbourg UMRS_1112, Strasbourg, France.,Laboratoires de Diagnostic Génétique, Hôpitaux Universitaires de Strasbourg, Strasbourg, France
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12
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Kousi M, Söylemez O, Ozanturk A, Mourtzi N, Akle S, Jungreis I, Muller J, Cassa CA, Brand H, Mokry JA, Wolf MY, Sadeghpour A, McFadden K, Lewis RA, Talkowski ME, Dollfus H, Kellis M, Davis EE, Sunyaev SR, Katsanis N. Evidence for secondary-variant genetic burden and non-random distribution across biological modules in a recessive ciliopathy. Nat Genet 2020; 52:1145-1150. [PMID: 33046855 PMCID: PMC8272915 DOI: 10.1038/s41588-020-0707-1] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2018] [Accepted: 08/31/2020] [Indexed: 11/08/2022]
Abstract
The influence of genetic background on driver mutations is well established; however, the mechanisms by which the background interacts with Mendelian loci remain unclear. We performed a systematic secondary-variant burden analysis of two independent cohorts of patients with Bardet-Biedl syndrome (BBS) with known recessive biallelic pathogenic mutations in one of 17 BBS genes for each individual. We observed a significant enrichment of trans-acting rare nonsynonymous secondary variants in patients with BBS compared with either population controls or a cohort of individuals with a non-BBS diagnosis and recessive variants in the same gene set. Strikingly, we found a significant over-representation of secondary alleles in chaperonin-encoding genes-a finding corroborated by the observation of epistatic interactions involving this complex in vivo. These data indicate a complex genetic architecture for BBS that informs the biological properties of disease modules and presents a model for secondary-variant burden analysis in recessive disorders.
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Affiliation(s)
- Maria Kousi
- Center for Human Disease Modeling, Duke University Medical Center, Durham, NC, USA
- Broad Institute of MIT and Harvard, Cambridge, MA, USA
- MIT Computer Science and Artificial Intelligence Laboratory, Cambridge, MA, USA
| | - Onuralp Söylemez
- Broad Institute of MIT and Harvard, Cambridge, MA, USA
- Division of Genetics, Brigham and Women's Hospital, Boston, MA, USA
- Department of Medicine, Harvard Medical School, Boston, MA, USA
| | - Aysegül Ozanturk
- Center for Human Disease Modeling, Duke University Medical Center, Durham, NC, USA
| | - Niki Mourtzi
- Advanced Center for Translational and Genetic Medicine, Lurie Children's Hospital, Chicago, IL, USA
| | - Sebastian Akle
- Division of Genetics, Brigham and Women's Hospital, Boston, MA, USA
- Department of Organismic and Evolutionary Biology, Harvard University, Boston, MA, USA
| | - Irwin Jungreis
- Broad Institute of MIT and Harvard, Cambridge, MA, USA
- MIT Computer Science and Artificial Intelligence Laboratory, Cambridge, MA, USA
| | - Jean Muller
- Laboratoire de Génétique Médicale, Institut de Génétique Médicale d'Alsace, INSERM U1112, Fédération de Médecine Translationnelle de Strasbourg (FMTS), Université de Strasbourg, Strasbourg, France
- Laboratoire de Diagnostic Génétique, Institut de Génétique Médicale d'Alsace, Hôpitaux Universitaires de Strasbourg, Strasbourg, France
| | - Christopher A Cassa
- Division of Genetics, Brigham and Women's Hospital, Boston, MA, USA
- Department of Medicine, Harvard Medical School, Boston, MA, USA
| | - Harrison Brand
- Molecular Neurogenetics Unit and Psychiatric and Neurodevelopmental Genetics Unit, Center for Genomic Medicine and Department of Neurology, Massachusetts General Hospital, Boston, MA, USA
- Program in Population and Medical Genetics and Genomics Platform, Broad Institute of MIT and Harvard, Cambridge, MA, USA
| | - Jill Anne Mokry
- Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, TX, USA
| | - Maxim Y Wolf
- Broad Institute of MIT and Harvard, Cambridge, MA, USA
- MIT Computer Science and Artificial Intelligence Laboratory, Cambridge, MA, USA
| | - Azita Sadeghpour
- Center for Human Disease Modeling, Duke University Medical Center, Durham, NC, USA
| | - Kelsey McFadden
- Center for Human Disease Modeling, Duke University Medical Center, Durham, NC, USA
| | - Richard A Lewis
- Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, TX, USA
- Department of Ophthalmology, Baylor College of Medicine, Houston, TX, USA
| | - Michael E Talkowski
- Molecular Neurogenetics Unit and Psychiatric and Neurodevelopmental Genetics Unit, Center for Genomic Medicine and Department of Neurology, Massachusetts General Hospital, Boston, MA, USA
- Program in Population and Medical Genetics and Genomics Platform, Broad Institute of MIT and Harvard, Cambridge, MA, USA
- Program in Bioinformatics and Integrative Genomics, Division of Medical Sciences, Harvard Medical School, Boston, MA, USA
| | - Hélène Dollfus
- Laboratoire de Génétique Médicale, Institut de Génétique Médicale d'Alsace, INSERM U1112, Fédération de Médecine Translationnelle de Strasbourg (FMTS), Université de Strasbourg, Strasbourg, France
| | - Manolis Kellis
- Broad Institute of MIT and Harvard, Cambridge, MA, USA
- MIT Computer Science and Artificial Intelligence Laboratory, Cambridge, MA, USA
| | - Erica E Davis
- Center for Human Disease Modeling, Duke University Medical Center, Durham, NC, USA
- Advanced Center for Translational and Genetic Medicine, Lurie Children's Hospital, Chicago, IL, USA
| | - Shamil R Sunyaev
- Broad Institute of MIT and Harvard, Cambridge, MA, USA
- Division of Genetics, Brigham and Women's Hospital, Boston, MA, USA
- Department of Medicine, Harvard Medical School, Boston, MA, USA
- Department of Biomedical Informatics, Harvard Medical School, Boston, MA, USA
| | - Nicholas Katsanis
- Center for Human Disease Modeling, Duke University Medical Center, Durham, NC, USA.
- Advanced Center for Translational and Genetic Medicine, Lurie Children's Hospital, Chicago, IL, USA.
- Departments of Pediatrics and Cellular and Molecular Biology, Northwestern University School of Medicine, Chicago, IL, USA.
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13
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Deletion in the Bardet-Biedl Syndrome Gene TTC8 Results in a Syndromic Retinal Degeneration in Dogs. Genes (Basel) 2020; 11:genes11091090. [PMID: 32962042 PMCID: PMC7565673 DOI: 10.3390/genes11091090] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2020] [Revised: 09/12/2020] [Accepted: 09/15/2020] [Indexed: 02/06/2023] Open
Abstract
In golden retriever dogs, a 1 bp deletion in the canine TTC8 gene has been shown to cause progressive retinal atrophy (PRA), the canine equivalent of retinitis pigmentosa. In humans, TTC8 is also implicated in Bardet–Biedl syndrome (BBS). To investigate if the affected dogs only exhibit a non-syndromic PRA or develop a syndromic ciliopathy similar to human BBS, we recruited 10 affected dogs to the study. The progression of PRA for two of the dogs was followed for 2 years, and a rigorous clinical characterization allowed a careful comparison with primary and secondary characteristics of human BBS. In addition to PRA, the dogs showed a spectrum of clinical and morphological signs similar to primary and secondary characteristics of human BBS patients, such as obesity, renal anomalies, sperm defects, and anosmia. We used Oxford Nanopore long-read cDNA sequencing to characterize retinal full-length TTC8 transcripts in affected and non-affected dogs, the results of which suggest that three isoforms are transcribed in the retina, and the 1 bp deletion is a loss-of-function mutation, resulting in a canine form of Bardet–Biedl syndrome with heterogeneous clinical signs.
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14
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Mauring L, Porter LF, Pelletier V, Riehm A, Leuvrey AS, Gouronc A, Studer F, Stoetzel C, Dollfus H, Muller J. Atypical Retinal Phenotype in a Patient With Alström Syndrome and Biallelic Novel Pathogenic Variants in ALMS1, Including a de novo Variation. Front Genet 2020; 11:938. [PMID: 32973878 PMCID: PMC7472914 DOI: 10.3389/fgene.2020.00938] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2020] [Accepted: 07/27/2020] [Indexed: 12/11/2022] Open
Abstract
Alström syndrome (ALMS) is a rare autosomal recessive multi-organ syndrome considered to date as a ciliopathy and caused by variations in ALMS1. Phenotypic variability is well-documented, particularly for the systemic disease manifestations; however, early-onset progressive retinal degeneration affecting both cones and rods (cone-rod type) is universal, leading to blindness by the teenage years. Other features include cardiomyopathy, kidney dysfunction, sensorineural deafness, and childhood obesity associated with hyperinsulinemia and type 2 diabetes mellitus. Here, we present an unusual and delayed retinal dystrophy phenotype associated with ALMS in a 14-year-old female, with affected cone function and surprising complete preservation of rod function on serial electroretinograms (ERGs). High-throughput sequencing of the affected proband revealed compound heterozygosity with two novel nonsense variations in the ALMS1 gene, including one variant of de novo inheritance, an unusual finding in autosomal recessive diseases. To confirm the diagnosis in the context of an unusually mild phenotype and identification of novel variations, we demonstrated the biallelic status of the compound heterozygous variations (c.[286C > T];[1211C > G], p.[(Gln96*)];[(Ser404*)]). This unique case extends our knowledge of the phenotypic variability and the pathogenic variation spectrum in ALMS patients.
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Affiliation(s)
- Laura Mauring
- Service de Génétique Médicale, Institut de Génétique Médicale d'Alsace, Centre de Référence pour les Affections Rares en Génétique Ophtalmologique (CARGO), Strasbourg, France
| | - Louise Frances Porter
- Department of Eye and Vision Science, Institute of Life Course and Medical Sciences, University of Liverpool, Liverpool, United Kingdom.,Alder Hey Children's Hospital Foundation Trust, Members of Liverpool Health Partners, Liverpool, United Kingdom
| | - Valerie Pelletier
- Service de Génétique Médicale, Institut de Génétique Médicale d'Alsace, Centre de Référence pour les Affections Rares en Génétique Ophtalmologique (CARGO), Strasbourg, France
| | - Axelle Riehm
- Laboratoire de Génétique Médicale, Institut de Génétique Médicale d'Alsace, INSERM U1112, Fédération de Médecine Translationnelle de Strasbourg (FMTS), Université de Strasbourg, Strasbourg, France
| | - Anne-Sophie Leuvrey
- Laboratoires de Diagnostic Génétique, Hôpitaux Universitaires de Strasbourg, Strasbourg, France
| | - Aurélie Gouronc
- Laboratoires de Diagnostic Génétique, Hôpitaux Universitaires de Strasbourg, Strasbourg, France
| | - Fouzia Studer
- Service de Génétique Médicale, Institut de Génétique Médicale d'Alsace, Centre de Référence pour les Affections Rares en Génétique Ophtalmologique (CARGO), Strasbourg, France
| | - Corinne Stoetzel
- Laboratoire de Génétique Médicale, Institut de Génétique Médicale d'Alsace, INSERM U1112, Fédération de Médecine Translationnelle de Strasbourg (FMTS), Université de Strasbourg, Strasbourg, France
| | - Helene Dollfus
- Service de Génétique Médicale, Institut de Génétique Médicale d'Alsace, Centre de Référence pour les Affections Rares en Génétique Ophtalmologique (CARGO), Strasbourg, France.,Department of Eye and Vision Science, Institute of Life Course and Medical Sciences, University of Liverpool, Liverpool, United Kingdom.,Laboratoire de Génétique Médicale, Institut de Génétique Médicale d'Alsace, INSERM U1112, Fédération de Médecine Translationnelle de Strasbourg (FMTS), Université de Strasbourg, Strasbourg, France
| | - Jean Muller
- Laboratoire de Génétique Médicale, Institut de Génétique Médicale d'Alsace, INSERM U1112, Fédération de Médecine Translationnelle de Strasbourg (FMTS), Université de Strasbourg, Strasbourg, France.,Laboratoires de Diagnostic Génétique, Hôpitaux Universitaires de Strasbourg, Strasbourg, France
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15
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Mary L, Chennen K, Stoetzel C, Antin M, Leuvrey A, Nourisson E, Alanio-Detton E, Antal MC, Attié-Bitach T, Bouvagnet P, Bouvier R, Buenerd A, Clémenson A, Devisme L, Gasser B, Gilbert-Dussardier B, Guimiot F, Khau Van Kien P, Leroy B, Loget P, Martinovic J, Pelluard F, Perez MJ, Petit F, Pinson L, Rooryck-Thambo C, Poch O, Dollfus H, Schaefer E, Muller J. Bardet-Biedl syndrome: Antenatal presentation of forty-five fetuses with biallelic pathogenic variants in known Bardet-Biedl syndrome genes. Clin Genet 2020; 95:384-397. [PMID: 30614526 DOI: 10.1111/cge.13500] [Citation(s) in RCA: 29] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2018] [Revised: 12/20/2018] [Accepted: 12/29/2018] [Indexed: 02/06/2023]
Abstract
Bardet-Biedl syndrome (BBS) is an emblematic ciliopathy associated with retinal dystrophy, obesity, postaxial polydactyly, learning disabilities, hypogonadism and renal dysfunction. Before birth, enlarged/cystic kidneys as well as polydactyly are the hallmark signs of BBS to consider in absence of familial history. However, these findings are not specific to BBS, raising the problem of differential diagnoses and prognosis. Molecular diagnosis during pregnancies remains a timely challenge for this heterogeneous disease (22 known genes). We report here the largest cohort of BBS fetuses to better characterize the antenatal presentation. Prenatal ultrasound (US) and/or autopsy data from 74 fetuses with putative BBS diagnosis were collected out of which molecular diagnosis was established in 51 cases, mainly in BBS genes (45 cases) following the classical gene distribution, but also in other ciliopathy genes (6 cases). Based on this, an updated diagnostic decision tree is proposed. No genotype/phenotype correlation could be established but postaxial polydactyly (82%) and renal cysts (78%) were the most prevalent symptoms. However, autopsy revealed polydactyly that was missed by prenatal US in 55% of the cases. Polydactyly must be carefully looked for in pregnancies with apparently isolated renal anomalies in fetuses.
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Affiliation(s)
- Laura Mary
- Laboratoire de Diagnostic Génétique, Hôpitaux Universitaires de Strasbourg, Strasbourg, France.,Laboratoire de Génétique Médicale, UMR_S INSERM U1112, IGMA, Faculté de Médecine FMTS, Université de Strasbourg, Strasbourg, France
| | - Kirsley Chennen
- Laboratoire de Génétique Médicale, UMR_S INSERM U1112, IGMA, Faculté de Médecine FMTS, Université de Strasbourg, Strasbourg, France.,Complex Systems and Translational Bioinformatics, ICube, University of Strasbourg, CNRS, Illkirch, France
| | - Corinne Stoetzel
- Laboratoire de Génétique Médicale, UMR_S INSERM U1112, IGMA, Faculté de Médecine FMTS, Université de Strasbourg, Strasbourg, France
| | - Manuela Antin
- Laboratoire de Diagnostic Génétique, Hôpitaux Universitaires de Strasbourg, Strasbourg, France
| | - Anne Leuvrey
- Laboratoire de Diagnostic Génétique, Hôpitaux Universitaires de Strasbourg, Strasbourg, France
| | - Elsa Nourisson
- Laboratoire de Diagnostic Génétique, Hôpitaux Universitaires de Strasbourg, Strasbourg, France
| | - Elisabeth Alanio-Detton
- Gynécologie-obstétrique, Centre de Dépistage Anténatal, Hôpital Maison-Blanche, Reims, France
| | - Maria C Antal
- Institut d'Histologie, Icube, Université de Strasbourg, Strasbourg, France.,Service de Pathologie, UF6349 Fœtopathologie, Hôpitaux Universitaires de Strasbourg, Strasbourg, France
| | - Tania Attié-Bitach
- INSERM U1163, Institut IMAGINE, Université Paris Descartes, Paris, France.,Service d'Histologie-Embryologie-Cytogénétique, Hôpital Necker-Enfants Malades, Assistance Publique-Hôpitaux de Paris, Paris, France
| | - Patrice Bouvagnet
- Laboratoire de Cardiogénétique, Malformations Cardiaques Congénitale, Hôpitaux Civils de Lyon, France
| | - Raymonde Bouvier
- Département de Pathologie, Centre Hospitalier Est, Hôpitaux Civils de Lyon, Lyon, France
| | - Annie Buenerd
- Département de Pathologie, Centre Hospitalier Est, Hôpitaux Civils de Lyon, Lyon, France
| | - Alix Clémenson
- Service d'Anatomie et Cytologie Pathologiques, CHU de Saint-Etienne, Saint-Étienne, France
| | - Louise Devisme
- Institut d'Anatomo-Pathologie, Centre de Biologie Pathologie, Centre Hospitalier Universitaire de Lille, Lille, France
| | - Bernard Gasser
- Laboratoire de Pathologie, GHR Mulhouse-Sud Alsace, Mulhouse, France
| | - Brigitte Gilbert-Dussardier
- Service de Génétique Médicale, Centre Hospitalier Universitaire de Poitiers, Poitiers, France.,EA3808 - NEUVACOD, Université de Poitiers, Poitiers, France
| | - Fabien Guimiot
- Unité Fonctionnelle de Fœtopathologie, Département de Génétique, Hôpital Robert Debré, Assistance Publique-Hôpitaux de Paris, Paris, France
| | - Philippe Khau Van Kien
- Unité de Génétique Médicale et Cytogénétique, Centre Hospitalier Universitaire de Nîmes, Nîmes, France
| | - Brigitte Leroy
- Service d'Anatomie Pathologique, CHI Poissy Saint Germain-en-Laye, Poissy, France
| | - Philippe Loget
- Service d'Anatomie Pathologique, Hôpital Pontchaillou, Université Rennes 1, Rennes, France
| | - Jelena Martinovic
- Unité de Fœtopathologie, Hôpital Antoine Béclère, Assistance Publique-Hôpitaux de Paris, Clamart, France
| | - Fanny Pelluard
- Service d'Anatomie-Cytologie Pathologique, Centre Hospitalier Universitaire de Bordeaux, Bordeaux, France.,INSERM UMR1053, Bordeaux Research in Translational Oncology, BaRITOn, Université de Bordeaux, Bordeaux, France
| | - Marie-Josée Perez
- Unité de Fœtopathologie, Service de Génétique Médicale, Centre Hospitalier Universitaire, Montpellier, France
| | - Florence Petit
- Clinique de Génétique Guy Fontaine, Centre Hospitalier Universitaire de Lille, Lille, France
| | - Lucile Pinson
- Département de Génétique Médicale, Centre Hospitalier Régional Universitaire de Montpellier, Montpellier, France
| | - Caroline Rooryck-Thambo
- Université Bordeaux, MRGM INSERM U1211, CHU de Bordeaux, Service de Génétique Médicale, Bordeaux, France
| | - Olivier Poch
- Complex Systems and Translational Bioinformatics, ICube, University of Strasbourg, CNRS, Illkirch, France
| | - Hélène Dollfus
- Laboratoire de Génétique Médicale, UMR_S INSERM U1112, IGMA, Faculté de Médecine FMTS, Université de Strasbourg, Strasbourg, France.,Service de Génétique Médicale, IGMA, Hôpitaux Universitaires de Strasbourg, Strasbourg, France.,Centre des Affections Rares en Génétique Ophtalmologique, FSMR SENSGENE, Hôpitaux Universitaires de Strasbourg, Strasbourg, France
| | - Elise Schaefer
- Laboratoire de Génétique Médicale, UMR_S INSERM U1112, IGMA, Faculté de Médecine FMTS, Université de Strasbourg, Strasbourg, France.,Service de Génétique Médicale, IGMA, Hôpitaux Universitaires de Strasbourg, Strasbourg, France
| | - Jean Muller
- Laboratoire de Diagnostic Génétique, Hôpitaux Universitaires de Strasbourg, Strasbourg, France.,Laboratoire de Génétique Médicale, UMR_S INSERM U1112, IGMA, Faculté de Médecine FMTS, Université de Strasbourg, Strasbourg, France
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16
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Gouronc A, Zilliox V, Jacquemont M, Darcel F, Leuvrey A, Nourisson E, Antin M, Alessandri J, Doray B, Gueguen P, Payet F, Randrianaivo H, Stoetzel C, Scheidecker S, Flodrops H, Dollfus H, Muller J. High prevalence of
Bardet‐Biedl
syndrome in
La Réunion
Island
is due to a founder variant in
ARL6/BBS3. Clin Genet 2020; 98:166-171. [DOI: 10.1111/cge.13768] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2020] [Revised: 04/24/2020] [Accepted: 04/27/2020] [Indexed: 12/11/2022]
Affiliation(s)
- Aurélie Gouronc
- Laboratoires de Diagnostic GénétiqueHôpitaux Universitaires de Strasbourg Strasbourg France
| | - Vincent Zilliox
- Unité Fonctionnelle de Bioinformatique Médicale appliquée au diagnostic (UF7363)Hôpitaux Universitaires de Strasbourg Strasbourg France
| | | | - Françoise Darcel
- Service des Maladies Neurologiques RaresGHSR, CHU de La Réunion Saint Pierre La Réunion France
| | - Anne‐Sophie Leuvrey
- Laboratoires de Diagnostic GénétiqueHôpitaux Universitaires de Strasbourg Strasbourg France
| | - Elsa Nourisson
- Laboratoires de Diagnostic GénétiqueHôpitaux Universitaires de Strasbourg Strasbourg France
| | - Manuela Antin
- Laboratoires de Diagnostic GénétiqueHôpitaux Universitaires de Strasbourg Strasbourg France
| | - Jean‐Luc Alessandri
- Pole Femme‐Mère‐Enfants, CH Félix GuyonCHU de La Réunion Saint‐Denis La Réunion France
| | - Bérénice Doray
- Service de Génétique, CH Félix GuyonCHU de La Réunion Saint‐Denis La Réunion France
| | - Paul Gueguen
- Service de Génétique, CH Félix GuyonCHU de La Réunion Saint‐Denis La Réunion France
| | - Frédérique Payet
- Service de Génétique, CH Félix GuyonCHU de La Réunion Saint‐Denis La Réunion France
| | | | - Corinne Stoetzel
- Laboratoire de Génétique MédicaleINSERM, UMRS_1112, Institut de Génétique Médicale d'Alsace (IGMA), Université de Strasbourg Faculté de médecine de Strasbourg Strasbourg France
| | - Sophie Scheidecker
- Laboratoires de Diagnostic GénétiqueHôpitaux Universitaires de Strasbourg Strasbourg France
- Laboratoire de Génétique MédicaleINSERM, UMRS_1112, Institut de Génétique Médicale d'Alsace (IGMA), Université de Strasbourg Faculté de médecine de Strasbourg Strasbourg France
| | - Hugues Flodrops
- Service de Pédiatrie, GHSRCHU de La Réunion Saint Pierre La Réunion France
| | - Hélène Dollfus
- Laboratoire de Génétique MédicaleINSERM, UMRS_1112, Institut de Génétique Médicale d'Alsace (IGMA), Université de Strasbourg Faculté de médecine de Strasbourg Strasbourg France
- Centre de Référence pour les affections rares en génétique ophtalmologique, CARGO, Filière SENSGENEHôpitaux Universitaires de Strasbourg Strasbourg France
- Service de Génétique MédicaleInstitut de Génétique Médicale d'Alsace, Hôpitaux Universitaires de Strasbourg Strasbourg France
| | - Jean Muller
- Laboratoires de Diagnostic GénétiqueHôpitaux Universitaires de Strasbourg Strasbourg France
- Unité Fonctionnelle de Bioinformatique Médicale appliquée au diagnostic (UF7363)Hôpitaux Universitaires de Strasbourg Strasbourg France
- Laboratoire de Génétique MédicaleINSERM, UMRS_1112, Institut de Génétique Médicale d'Alsace (IGMA), Université de Strasbourg Faculté de médecine de Strasbourg Strasbourg France
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17
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Klink BU, Gatsogiannis C, Hofnagel O, Wittinghofer A, Raunser S. Structure of the human BBSome core complex. eLife 2020; 9:53910. [PMID: 31951201 PMCID: PMC7018512 DOI: 10.7554/elife.53910] [Citation(s) in RCA: 49] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2019] [Accepted: 01/15/2020] [Indexed: 01/09/2023] Open
Abstract
The BBSome is a heterooctameric protein complex that plays a central role in primary cilia homeostasis. Its malfunction causes the severe ciliopathy Bardet-Biedl syndrome (BBS). The complex acts as a cargo adapter that recognizes signaling proteins such as GPCRs and links them to the intraflagellar transport machinery. The underlying mechanism is poorly understood. Here we present a high-resolution cryo-EM structure of a human heterohexameric core subcomplex of the BBSome. The structure reveals the architecture of the complex in atomic detail. It explains how the subunits interact with each other and how disease-causing mutations hamper this interaction. The complex adopts a conformation that is open for binding to membrane-associated GTPase Arl6 and a large positively charged patch likely strengthens the interaction with the membrane. A prominent negatively charged cleft at the center of the complex is likely involved in binding of positively charged signaling sequences of cargo proteins.
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Affiliation(s)
- Björn Udo Klink
- Department of Structural Biochemistry, Max Planck Institute of Molecular Physiology, Dortmund, Germany
| | - Christos Gatsogiannis
- Department of Structural Biochemistry, Max Planck Institute of Molecular Physiology, Dortmund, Germany
| | - Oliver Hofnagel
- Department of Structural Biochemistry, Max Planck Institute of Molecular Physiology, Dortmund, Germany
| | - Alfred Wittinghofer
- Structural Biology Group, Max Planck Institute of Molecular Physiology, Dortmund, Germany
| | - Stefan Raunser
- Department of Structural Biochemistry, Max Planck Institute of Molecular Physiology, Dortmund, Germany
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18
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Singh SK, Gui M, Koh F, Yip MC, Brown A. Structure and activation mechanism of the BBSome membrane protein trafficking complex. eLife 2020; 9:53322. [PMID: 31939736 PMCID: PMC7018513 DOI: 10.7554/elife.53322] [Citation(s) in RCA: 48] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2019] [Accepted: 01/06/2020] [Indexed: 12/19/2022] Open
Abstract
Bardet-Biedl syndrome (BBS) is a currently incurable ciliopathy caused by the failure to correctly establish or maintain cilia-dependent signaling pathways. Eight proteins associated with BBS assemble into the BBSome, a key regulator of the ciliary membrane proteome. We report the electron cryomicroscopy (cryo-EM) structures of the native bovine BBSome in inactive and active states at 3.1 and 3.5 Å resolution, respectively. In the active state, the BBSome is bound to an Arf-family GTPase (ARL6/BBS3) that recruits the BBSome to ciliary membranes. ARL6 recognizes a composite binding site formed by BBS1 and BBS7 that is occluded in the inactive state. Activation requires an unexpected swiveling of the β-propeller domain of BBS1, the subunit most frequently implicated in substrate recognition, which widens a central cavity of the BBSome. Structural mapping of disease-causing mutations suggests that pathogenesis results from folding defects and the disruption of autoinhibition and activation.
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Affiliation(s)
- Sandeep K Singh
- Department of Biological Chemistry and Molecular Pharmacology, Blavatnik Institute, Harvard Medical School, Boston, United States
| | - Miao Gui
- Department of Biological Chemistry and Molecular Pharmacology, Blavatnik Institute, Harvard Medical School, Boston, United States
| | - Fujiet Koh
- Department of Biological Chemistry and Molecular Pharmacology, Blavatnik Institute, Harvard Medical School, Boston, United States
| | - Matthew Cj Yip
- Department of Cell Biology, Blavatnik Institute, Harvard Medical School, Boston, United States
| | - Alan Brown
- Department of Biological Chemistry and Molecular Pharmacology, Blavatnik Institute, Harvard Medical School, Boston, United States
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19
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Estrada-Cuzcano A, Etard C, Delvallée C, Stoetzel C, Schaefer E, Scheidecker S, Geoffroy V, Schneider A, Studer F, Mattioli F, Chennen K, Sigaudy S, Plassard D, Poch O, Piton A, Strahle U, Muller J, Dollfus H. Novel IQCE variations confirm its role in postaxial polydactyly and cause ciliary defect phenotype in zebrafish. Hum Mutat 2019; 41:240-254. [PMID: 31549751 DOI: 10.1002/humu.23924] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/20/2019] [Revised: 09/06/2019] [Accepted: 09/15/2019] [Indexed: 12/12/2022]
Abstract
Polydactyly is one of the most frequent inherited defects of the limbs characterized by supernumerary digits and high-genetic heterogeneity. Among the many genes involved, either in isolated or syndromic forms, eight have been implicated in postaxial polydactyly (PAP). Among those, IQCE has been recently identified in a single consanguineous family. Using whole-exome sequencing in patients with uncharacterized ciliopathies, including PAP, we identified three families with biallelic pathogenic variations in IQCE. Interestingly, the c.895_904del (p.Val301Serfs*8) was found in all families without sharing a common haplotype, suggesting a recurrent mechanism. Moreover, in two families, the systemic phenotype could be explained by additional pathogenic variants in known genes (TULP1, ATP6V1B1). RNA expression analysis on patients' fibroblasts confirms that the dysfunction of IQCE leads to the dysregulation of genes associated with the hedgehog-signaling pathway, and zebrafish experiments demonstrate a full spectrum of phenotypes linked to defective cilia: Body curvature, kidney cysts, left-right asymmetry, misdirected cilia in the pronephric duct, and retinal defects. In conclusion, we identified three additional families confirming IQCE as a nonsyndromic PAP gene. Our data emphasize the importance of taking into account the complete set of variations of each individual, as each clinical presentation could finally be explained by multiple genes.
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Affiliation(s)
- Alejandro Estrada-Cuzcano
- Laboratoire de Génétique médicale, UMR_S INSERM U1112, IGMA, Faculté de Médecine, FMTS, Université de Strasbourg, Strasbourg, France
| | - Christelle Etard
- Institute of Toxicology and Genetics (ITG), Karlsruhe Institute of Technology (KIT), Karlsruhe, Eggenstein-Leopoldshafen, Germany
| | - Clarisse Delvallée
- Laboratoire de Génétique médicale, UMR_S INSERM U1112, IGMA, Faculté de Médecine, FMTS, Université de Strasbourg, Strasbourg, France
| | - Corinne Stoetzel
- Laboratoire de Génétique médicale, UMR_S INSERM U1112, IGMA, Faculté de Médecine, FMTS, Université de Strasbourg, Strasbourg, France
| | - Elise Schaefer
- Laboratoire de Génétique médicale, UMR_S INSERM U1112, IGMA, Faculté de Médecine, FMTS, Université de Strasbourg, Strasbourg, France.,Service de Génétique Médicale, Institut de Génétique Médicale d'Alsace, Hôpitaux Universitaires de Strasbourg, Strasbourg, France
| | - Sophie Scheidecker
- Laboratoire de Génétique médicale, UMR_S INSERM U1112, IGMA, Faculté de Médecine, FMTS, Université de Strasbourg, Strasbourg, France.,Laboratoires de Diagnostic Génétique, Hôpitaux Universitaires de Strasbourg, Strasbourg, France
| | - Véronique Geoffroy
- Laboratoire de Génétique médicale, UMR_S INSERM U1112, IGMA, Faculté de Médecine, FMTS, Université de Strasbourg, Strasbourg, France
| | - Aline Schneider
- Laboratoire de Génétique médicale, UMR_S INSERM U1112, IGMA, Faculté de Médecine, FMTS, Université de Strasbourg, Strasbourg, France
| | - Fouzia Studer
- Centre de Référence pour les affections rares en génétique ophtalmologique, CARGO, Filière SENSGENE, Hôpitaux Universitaires de Strasbourg, Strasbourg, France
| | - Francesca Mattioli
- Institut de Génétique et de Biologie Moléculaire et Cellulaire, Illkirch-Graffenstaden, France.,Institut de Génétique et de Biologie Moléculaire et Cellulaire, INSERM U1258, Illkirch-Graffenstaden, France.,Institut de Génétique et de Biologie Moléculaire et Cellulaire, CNRS UMR 7104, Illkirch-Graffenstaden, France.,Institut de Génétique et de Biologie Moléculaire et Cellulaire, Université de Strasbourg, Illkirch, France
| | - Kirsley Chennen
- Laboratoire de Génétique médicale, UMR_S INSERM U1112, IGMA, Faculté de Médecine, FMTS, Université de Strasbourg, Strasbourg, France.,Complex Systems and Translational Bioinformatics, ICube UMR 7357, Fédération de Médecine Translationnelle, Université de Strasbourg, Strasbourg, France
| | - Sabine Sigaudy
- Département de Génétique Médicale, Hôpital de la Timone, Marseille, France
| | | | - Olivier Poch
- Complex Systems and Translational Bioinformatics, ICube UMR 7357, Fédération de Médecine Translationnelle, Université de Strasbourg, Strasbourg, France
| | - Amélie Piton
- Laboratoires de Diagnostic Génétique, Hôpitaux Universitaires de Strasbourg, Strasbourg, France.,Institut de Génétique et de Biologie Moléculaire et Cellulaire, Illkirch-Graffenstaden, France.,Institut de Génétique et de Biologie Moléculaire et Cellulaire, INSERM U1258, Illkirch-Graffenstaden, France.,Institut de Génétique et de Biologie Moléculaire et Cellulaire, CNRS UMR 7104, Illkirch-Graffenstaden, France.,Institut de Génétique et de Biologie Moléculaire et Cellulaire, Université de Strasbourg, Illkirch, France
| | - Uwe Strahle
- Institute of Toxicology and Genetics (ITG), Karlsruhe Institute of Technology (KIT), Karlsruhe, Eggenstein-Leopoldshafen, Germany
| | - Jean Muller
- Laboratoire de Génétique médicale, UMR_S INSERM U1112, IGMA, Faculté de Médecine, FMTS, Université de Strasbourg, Strasbourg, France.,Laboratoires de Diagnostic Génétique, Hôpitaux Universitaires de Strasbourg, Strasbourg, France
| | - Hélène Dollfus
- Laboratoire de Génétique médicale, UMR_S INSERM U1112, IGMA, Faculté de Médecine, FMTS, Université de Strasbourg, Strasbourg, France.,Service de Génétique Médicale, Institut de Génétique Médicale d'Alsace, Hôpitaux Universitaires de Strasbourg, Strasbourg, France.,Centre de Référence pour les affections rares en génétique ophtalmologique, CARGO, Filière SENSGENE, Hôpitaux Universitaires de Strasbourg, Strasbourg, France
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20
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Renaud M, Moreira MC, Ben Monga B, Rodriguez D, Debs R, Charles P, Chaouch M, Ferrat F, Laurencin C, Vercueil L, Mallaret M, M'Zahem A, Pacha LA, Tazir M, Tilikete C, Ollagnon E, Ochsner F, Kuntzer T, Jung HH, Beis JM, Netter JC, Djamshidian A, Bower M, Bottani A, Walsh R, Murphy S, Reiley T, Bieth É, Roelens F, Poll-The BT, Lourenço CM, Jardim LB, Straussberg R, Landrieu P, Roze E, Thobois S, Pouget J, Guissart C, Goizet C, Dürr A, Tranchant C, Koenig M, Anheim M. Clinical, Biomarker, and Molecular Delineations and Genotype-Phenotype Correlations of Ataxia With Oculomotor Apraxia Type 1. JAMA Neurol 2019; 75:495-502. [PMID: 29356829 DOI: 10.1001/jamaneurol.2017.4373] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Importance Ataxia with oculomotor apraxia type 1 (AOA1) is an autosomal recessive cerebellar ataxia due to mutations in the aprataxin gene (APTX) that is characterized by early-onset cerebellar ataxia, oculomotor apraxia, axonal motor neuropathy, and eventual decrease of albumin serum levels. Objectives To improve the clinical, biomarker, and molecular delineation of AOA1 and provide genotype-phenotype correlations. Design, Setting, and Participants This retrospective analysis included the clinical, biological (especially regarding biomarkers of the disease), electrophysiologic, imaging, and molecular data of all patients consecutively diagnosed with AOA1 in a single genetics laboratory from January 1, 2002, through December 31, 2014. Data were analyzed from January 1, 2015, through January 31, 2016. Main Outcomes and Measures The clinical, biological, and molecular spectrum of AOA1 and genotype-phenotype correlations. Results The diagnosis of AOA1 was confirmed in 80 patients (46 men [58%] and 34 women [42%]; mean [SD] age at onset, 7.7 [7.4] years) from 51 families, including 57 new (with 8 new mutations) and 23 previously described patients. Elevated levels of α-fetoprotein (AFP) were found in 33 patients (41%); hypoalbuminemia, in 50 (63%). Median AFP level was higher in patients with AOA1 (6.0 ng/mL; range, 1.1-17.0 ng/mL) than in patients without ataxia (3.4 ng/mL; range, 0.8-17.2 ng/mL; P < .01). Decreased albumin levels (ρ = -0.532) and elevated AFP levels (ρ = 0.637) were correlated with disease duration. The p.Trp279* mutation, initially reported as restricted to the Portuguese founder haplotype, was discovered in 53 patients with AOA1 (66%) with broad white racial origins. Oculomotor apraxia was found in 49 patients (61%); polyneuropathy, in 74 (93%); and cerebellar atrophy, in 78 (98%). Oculomotor apraxia correlated with the severity of ataxia and mutation type, being more frequent with deletion or truncating mutations (83%) than with presence of at least 1 missense variant (17%; P < .01). Mean (SD) age at onset was higher for patients with at least 1 missense mutation (17.7 [11.4] vs 5.2 [2.6] years; P < .001). Conclusions and Relevance The AFP level, slightly elevated in a substantial fraction of patients, may constitute a new biomarker for AOA1. Oculomotor apraxia may be an optional finding in AOA1 and correlates with more severe disease. The p.Trp279* mutation is the most frequent APTX mutation in the white population. APTX missense mutations may be associated with a milder phenotype.
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Affiliation(s)
- Mathilde Renaud
- Service de Neurologie, Hôpitaux Universitaires de Strasbourg, Strasbourg, France.,Institut de Génétique et de Biologie Moléculaire et Cellulaire, Institut National de la Santé et de la Recherche Medicale (INSERM)-U964, Centre National de la Recherche Scientifique (CNRS)-Unité Mixte de Recherché (UMR) 7104, Université de Strasbourg, Illkirch, France.,Fédération de Médecine Translationnelle de Strasbourg, Université de Strasbourg, Strasbourg, France
| | - Maria-Céu Moreira
- Institut de Génétique et de Biologie Moléculaire et Cellulaire, Institut National de la Santé et de la Recherche Medicale (INSERM)-U964, Centre National de la Recherche Scientifique (CNRS)-Unité Mixte de Recherché (UMR) 7104, Université de Strasbourg, Illkirch, France
| | - Bondo Ben Monga
- Faculté de Médecine et Ecole de Santé Publique, Université de Lubumbashi, Lubumbashi, République Démocratique du Congo
| | - Diana Rodriguez
- Service de Neuropédiatrie, Hôpital d'Enfants Armand-Trousseau, Paris, France.,Centre de Référence de Neurogénétique, Hôpital Armand-Trousseau, Hôpitaux Universitaires Est Parisien, Assistance Publique-Hôpitaux de Paris, Paris, France.,Groupe de Recherch Clinique ConCer-LD, Sorbonne Universités, l'Université Pierre-et-Marie-Curie, Université Paris 06, Paris, France.,Neuroprotection du Cerveau en Développement, INSERM U1141, Paris, France
| | - Rabab Debs
- Département de Génétique, Hôpital de La Pitié-Salpétrière, Paris, France
| | - Perrine Charles
- Département de Génétique, Hôpital de La Pitié-Salpétrière, Paris, France
| | - Malika Chaouch
- Service de Neurologie, Etablissement Hospitalier Spécialisé, Algers, Algeria
| | - Farida Ferrat
- Service de Neurologie, Etablissement Hospitalier Spécialisé de Ben Aknoun, Algers, Algeria
| | - Chloé Laurencin
- Service de Neurologie C, Hopital Neurologique, Hospices Civils de Lyon, Université de Lyon, Université Claude Bernard Lyon 1, Lyon, France.,CNRS, Institut des Sciences Cognitives, UMR 5229, Bron, France
| | - Laurent Vercueil
- Exploration Fonctionnelle du Système Nerveux, Pôle de Psychiatrie, Neurologie et Rééducation Neurologique, Centre Hospitalier Universitaire (CHU) Grenoble, Grenoble, France.,INSERM U836, Grenoble Institut des Neurosciences, Bâtiment Edmond J. Safra, Chemin Fortuné Ferrini, La Tronche, France
| | - Martial Mallaret
- Exploration Fonctionnelle du Système Nerveux, Pôle de Psychiatrie, Neurologie et Rééducation Neurologique, Centre Hospitalier Universitaire (CHU) Grenoble, Grenoble, France
| | | | | | - Meriem Tazir
- Service de Neurologie, CHU Mustapha, Algers, Algeria
| | - Caroline Tilikete
- Service de Neuro-ophtalmologie, Hôpital Neurologique, CHU Lyon, Bron, France
| | | | | | | | - Hans H Jung
- Department of Neurology, University Hospital Zurich, Zurich, Switzerland
| | - Jean-Marie Beis
- Institut Régional de Médecine Physique et de Réadaptation, Centre de Lay-Saint-Christophe, France
| | | | - Atbin Djamshidian
- Department of Neurology, Medical University Innsbruck, Innsbruck, Austria
| | - Mattew Bower
- Department of Neurology, University of Minnesota Health, Minneapolis, Minnesota
| | - Armand Bottani
- Service de Génétique, Hôpitaux Universitaires de Genève, Genève, Suisse
| | - Richard Walsh
- Academic Unit of Neurology, Trinity College Dublin, Dublin, Ireland.,National Ataxia Clinic, Adelaide and Meath Hospital Dublin, National Children's Hospital, Dublin, Ireland
| | - Sinead Murphy
- National Ataxia Clinic, Adelaide and Meath Hospital Dublin, National Children's Hospital, Dublin, Ireland
| | - Thomas Reiley
- Department of Public Health and Environment, Greeley, Colorado
| | - Éric Bieth
- Service de Génétique Médicale, Hopital Purpan, Toulouse, France
| | | | - Bwee Tien Poll-The
- Pediatric Neurology, Emma Children's Hospital, University of Amsterdam, Amsterdam, the Netherlands
| | - Charles Marques Lourenço
- Neurogenetics Unit, School of Medicine of Ribeirao Preto, University of São Paulo, São Paulo, Brazil
| | - Laura Bannach Jardim
- Medical Genetics Service, Hospital de Clinicas de Porto Alegre, Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil
| | - Rachel Straussberg
- Neurogenetics Clinic, Department of Child Neurology, Schneider Children's Medical Center of Israel, Petach Tikva, Israel.,Sackler School of Medicine Tel Aviv University, Ramat Aviv, Israel
| | - Pierre Landrieu
- Service de Neurologie Pédiatrique, Hôpital Bicêtre, Paris, France
| | - Emmanuel Roze
- Département de Génétique, Hôpital de La Pitié-Salpétrière, Paris, France
| | - Stéphane Thobois
- Service de Neurologie C, Hopital Neurologique, Hospices Civils de Lyon, Université de Lyon, Université Claude Bernard Lyon 1, Lyon, France.,CNRS, Institut des Sciences Cognitives, UMR 5229, Bron, France
| | - Jean Pouget
- Service de Neurologie, Hôpital de la Timone, Marseille, France
| | - Claire Guissart
- Laboratoire de Génétique de Maladies Rares EA7402, Institut Universitaire de Recherche Clinique, Université de Montpellier, CHU Montpellier, Montpellier, France
| | - Cyril Goizet
- Service de Génétique Médicale, CHU Bordeaux, Bordeaux, France.,INSERM U1211, Laboratoire Maladies Rares Génétique et Métabolisme, Université de Bordeaux, Bordeaux, France
| | - Alexandra Dürr
- Département de Génétique, Hôpital de La Pitié-Salpétrière, Paris, France
| | - Christine Tranchant
- Service de Neurologie, Hôpitaux Universitaires de Strasbourg, Strasbourg, France.,Institut de Génétique et de Biologie Moléculaire et Cellulaire, Institut National de la Santé et de la Recherche Medicale (INSERM)-U964, Centre National de la Recherche Scientifique (CNRS)-Unité Mixte de Recherché (UMR) 7104, Université de Strasbourg, Illkirch, France.,Fédération de Médecine Translationnelle de Strasbourg, Université de Strasbourg, Strasbourg, France
| | - Michel Koenig
- Laboratoire de Génétique de Maladies Rares EA7402, Institut Universitaire de Recherche Clinique, Université de Montpellier, CHU Montpellier, Montpellier, France
| | - Mathieu Anheim
- Service de Neurologie, Hôpitaux Universitaires de Strasbourg, Strasbourg, France.,Institut de Génétique et de Biologie Moléculaire et Cellulaire, Institut National de la Santé et de la Recherche Medicale (INSERM)-U964, Centre National de la Recherche Scientifique (CNRS)-Unité Mixte de Recherché (UMR) 7104, Université de Strasbourg, Illkirch, France.,Fédération de Médecine Translationnelle de Strasbourg, Université de Strasbourg, Strasbourg, France
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The Molecular Architecture of Native BBSome Obtained by an Integrated Structural Approach. Structure 2019; 27:1384-1394.e4. [PMID: 31303482 DOI: 10.1016/j.str.2019.06.006] [Citation(s) in RCA: 34] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2019] [Revised: 05/21/2019] [Accepted: 06/17/2019] [Indexed: 01/09/2023]
Abstract
The unique membrane composition of cilia is maintained by a diffusion barrier at the transition zone that is breached when the BBSome escorts signaling receptors out of cilia. Understanding how the BBSome removes proteins from cilia has been hampered by a lack of structural information. Here, we present a nearly complete Cα model of BBSome purified from cow retina. The model is based on a single-particle cryo-electron microscopy density map at 4.9-Å resolution that was interpreted with the help of comprehensive Rosetta-based structural modeling constrained by crosslinking mass spectrometry data. We find that BBSome subunits have a very high degree of interconnectivity, explaining the obligate nature of the complex. Furthermore, like other coat adaptors, the BBSome exists in an autoinhibited state in solution and must thus undergo a conformational change upon recruitment to membranes by the small GTPase ARL6/BBS3. Our model provides the first detailed view of the machinery enabling ciliary exit.
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22
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Li QY, Huang LY, Li DZ. Early prenatal detection of Bardet-Biedl syndrome in a case with postaxial polydactyly and hyperechoic kidneys confirmed by next generation sequencing. Congenit Anom (Kyoto) 2019; 59:142-144. [PMID: 30073714 DOI: 10.1111/cga.12306] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/21/2018] [Revised: 07/30/2018] [Accepted: 07/31/2018] [Indexed: 12/16/2022]
Affiliation(s)
- Qiao-Yi Li
- Prenatal Diagnostic Center, Dongguan Maternal and Children Health Hospital, Dongguan, China
| | - Lv-Ying Huang
- Guangzhou Women and Children's Medical Center affiliated to Guangzhou Medical University, Guangzhou, China
| | - Dong-Zhi Li
- Guangzhou Women and Children's Medical Center affiliated to Guangzhou Medical University, Guangzhou, China
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23
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Shukla HG, Bawa PS, Srinivasan S. hg19KIndel: ethnicity normalized human reference genome. BMC Genomics 2019; 20:459. [PMID: 31170919 PMCID: PMC6555027 DOI: 10.1186/s12864-019-5854-3] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2019] [Accepted: 05/29/2019] [Indexed: 11/22/2022] Open
Abstract
Background The most widely used human genome reference assembly hg19 harbors minor alleles at 2.18 million positions as revealed by 1000 Genome Phase 3 dataset. Although this is less than 2% of the 89 million variants reported, it has been shown that the minor alleles can result in 30% false positives in individual genomes, thus misleading and burdening downstream interpretation. More alarming is the fact that, significant percentage of variants that are homozygous recessive for these minor alleles, with potential disease implications, are masked from reporting. Results We have demonstrated that the false positives (FP) and false negatives (FN) can be corrected for by simply replacing nucleotides at the minor allele positions in hg19 with corresponding major allele. Here, we have effectively replaced 2.18 million minor alleles Single Nucleotide Polymorphism (SNPs), Insertion and Deletions (INDELs), Multiple Nucleotide Polymorphism (MNPs) in hg19 with the corresponding major alleles to create an ethnically normalized reference genome called hg19KIndel. In doing so, hg19KIndel has both corrected for sequencing errors acknowledged to be present in hg19 and has improved read alignment near the minor alleles in hg19. Conclusion We have created and made available a new version human reference genome called hg19KIndel. It has been shown that variant calling using hg19KIndel, significantly reduces false positives calls, which in-turn reduces the burden from downstream analysis and validation. It also improved false negative variants call, which means that the variants which were getting missed due to the presence of minor alleles in hg19, will now be called using hg19KIndel. Using hg19KIndel, one even gets a better mapping percentage when compared to currently available human reference genome. hg19KIndel reference genome and its auxiliary datasets are available at 10.5281/zenodo.2638113
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Affiliation(s)
- Harsh G Shukla
- Institute of Bioinformatics and Applied Biotechnology, Biotech Park, Electronic City Phase I, Bangalore, 560100, India
| | - Pushpinder Singh Bawa
- Institute of Bioinformatics and Applied Biotechnology, Biotech Park, Electronic City Phase I, Bangalore, 560100, India.,Manipal Academy of Higher Education (MAHE), Manipal, India
| | - Subhashini Srinivasan
- Institute of Bioinformatics and Applied Biotechnology, Biotech Park, Electronic City Phase I, Bangalore, 560100, India.
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Anosov M, Birk R. Bardet-Biedl syndrome obesity: BBS4 regulates cellular ER stress in early adipogenesis. Mol Genet Metab 2019; 126:495-503. [PMID: 30902542 DOI: 10.1016/j.ymgme.2019.03.006] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/15/2019] [Revised: 02/16/2019] [Accepted: 03/14/2019] [Indexed: 02/06/2023]
Abstract
BACKGROUND Bardet-Biedl syndrome (BBS) is an autosomal recessive ciliopathy, presenting with early obesity onset. The etiology of BBS obesity involves both central and peripheral defects, through mechanisms mostly yet to be deciphered. We previously showed BBS4 expression in adipogenesis, peaking at day 3 of differentiation. Obesity is characterized by cellular stress which promotes pathological consequences. AIMS We set out to test a possible role of BBS4 in adipocyte endoplasmic reticulum (ER) stress-induced unfolding protein response (UPR). METHODS BBS4 silenced (SiBBS4) and overexpressing (OEBBS4) pre-adipocyte murine cell lines were subjected to ER-stress induction (Tunicamycin, TM) during adipogenesis. ER-stress UPR was analyzed at the transcript, protein and biochemical levels (microscopy, immunocytochemistry, western blotting, quantitative RT-PCR and X-box binding protein 1 (XBP-1) splicing). RESULTS In silico analysis showed that BBS4 harbors an ER localization sequences indicative of ER localization. We verified BBS4's ER localization in adipocytes by immunocytochemistry and cellular protein fractionation. Furthermore, we demonstrated that BBS4 expression is significantly up-regulated by ER-stress, as indicated by protein and transcript levels. SiBBS4 adipocytes exhibited swollen ER typical to ER-stress and significant XBP-1 down-regulation at day 3 of differentiation. Following ER-stress, SiBBS4 adipocytes exhibited XBP-1 ER retention, failure to translocate to the nucleus and depletion of the nuclear active cleaved ATF6α. BBS4 did not alter ATF6α processing by S1P and S2P in the Golgi. Notably, SiBBS4 cells demonstrated significant reduction in the downstream activated phospho-IRE1α, independent of ER-stress. CONCLUSIONS At day 3 of adipogenesis, coinciding with the timing of its peak expression, BBS4 is localized to the ER and is involved in the ER stress response and trafficking. BBS4 depletion results in swollen ER with impaired intracellular nucleus translocation of XBP-1 and ATF6α. Thus, BBS4 affects the ER stress response in early adipogenesis, altering ER stress responsiveness and the adipocyte ER phenotype.
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Affiliation(s)
- Mariana Anosov
- Department of Nutrition, Faculty of Health Sciences, Ariel University, 40700, Israel
| | - Ruth Birk
- Department of Nutrition, Faculty of Health Sciences, Ariel University, 40700, Israel.
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25
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Sato S, Morimoto T, Hotta K, Fujikado T, Nishida K. A novel compound heterozygous mutation in TTC8 identified in a Japanese patient. Hum Genome Var 2019; 6:14. [PMID: 30886724 PMCID: PMC6418288 DOI: 10.1038/s41439-019-0045-y] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2018] [Revised: 12/24/2018] [Accepted: 01/10/2019] [Indexed: 12/23/2022] Open
Abstract
Bardet-Biedl syndrome (BBS), characterized by rod-cone dystrophy, postaxial polydactyly, central obesity, hypogonadism, renal abnormalities, and mental retardation, is a rare autosomal recessive disorder. To date, 21 causative genes have been reported. Here we describe a Japanese BBS patient with a novel compound heterozygous mutation in TTC8. To the best of our knowledge, this is the first description of a BBS patient with a mutation in the TTC8 gene in Japan.
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Affiliation(s)
- Shigeru Sato
- 1Department of Ophthalmology, Osaka University Graduate School of Medicine, Osaka, Japan
| | - Takeshi Morimoto
- 1Department of Ophthalmology, Osaka University Graduate School of Medicine, Osaka, Japan.,2Department of Applied Visual Science, Osaka University Graduate School of Medicine, Osaka, Japan
| | - Kikuko Hotta
- 3Department of Medical Innovation, Osaka University Hospital, Osaka, Japan
| | - Takashi Fujikado
- 1Department of Ophthalmology, Osaka University Graduate School of Medicine, Osaka, Japan.,2Department of Applied Visual Science, Osaka University Graduate School of Medicine, Osaka, Japan
| | - Kohji Nishida
- 1Department of Ophthalmology, Osaka University Graduate School of Medicine, Osaka, Japan
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26
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Schaefer E, Delvallée C, Mary L, Stoetzel C, Geoffroy V, Marks-Delesalle C, Holder-Espinasse M, Ghoumid J, Dollfus H, Muller J. Identification and Characterization of Known Biallelic Mutations in the IFT27 ( BBS19) Gene in a Novel Family With Bardet-Biedl Syndrome. Front Genet 2019; 10:21. [PMID: 30761183 PMCID: PMC6363664 DOI: 10.3389/fgene.2019.00021] [Citation(s) in RCA: 28] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2018] [Accepted: 01/15/2019] [Indexed: 12/30/2022] Open
Abstract
Bardet-Biedl syndrome (BBS; MIM 209900) is a rare ciliopathy characterized by retinitis pigmentosa, postaxial polydactyly, obesity, hypogonadism, cognitive impairment and kidney dysfunction. Mutations in 22 BBS genes have been identified to cause the disease. We report a family with typical BBS features (retinitis pigmentosa, postaxial polydactyly, obesity, cognitive impairment, and atrioventricular septal defect) mutated in IFT27/BBS19. IFT27 is part of the Intraflagellar transport (IFT), a bidirectional mechanism allowing the protein motility within the cilia. Using whole exome sequencing, two compound heterozygous mutations were found in the proband (NM_006860.4:c.[104A > G];[349+1G > T], p.[Tyr35Cys];[?]) consistent with the expected autosomal recessive inheritance mode. These two mutations have already been reported but independently in other families and lacking either familial segregation or functional validation. This is the third report of IFT27 mutations in BBS patients confirming IFT27 as a BBS gene (BBS19). Mutations in IFT genes (IFT27, IFT172 and IFT74) confirm the IFT-pathway as a pathomechanism for BBS.
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Affiliation(s)
- Elise Schaefer
- Laboratoire de Génétique Médicale, Institut de Génétique Médicale d'Alsace, INSERM U1112, Fédération de Médecine Translationnelle de Strasbourg, Université de Strasbourg, Strasbourg, France.,Service de Génétique Médicale, Hôpitaux Universitaires de Strasbourg, Strasbourg, France
| | - Clarisse Delvallée
- Laboratoire de Génétique Médicale, Institut de Génétique Médicale d'Alsace, INSERM U1112, Fédération de Médecine Translationnelle de Strasbourg, Université de Strasbourg, Strasbourg, France
| | - Laura Mary
- Laboratoire de Diagnostic Génétique, Hôpitaux Universitaires de Strasbourg, Strasbourg, France
| | - Corinne Stoetzel
- Laboratoire de Génétique Médicale, Institut de Génétique Médicale d'Alsace, INSERM U1112, Fédération de Médecine Translationnelle de Strasbourg, Université de Strasbourg, Strasbourg, France
| | - Véronique Geoffroy
- Laboratoire de Génétique Médicale, Institut de Génétique Médicale d'Alsace, INSERM U1112, Fédération de Médecine Translationnelle de Strasbourg, Université de Strasbourg, Strasbourg, France
| | - Caroline Marks-Delesalle
- Service d'Exploration de la Vision et Neuro-Ophtalmologie, Hôpital Roger Salengro, CHRU Lille, Lille, France
| | | | - Jamal Ghoumid
- Service de Génétique Clinique, Hôpital Jeanne de Flandre, CHRU Lille, Lille, France
| | - Hélène Dollfus
- Laboratoire de Génétique Médicale, Institut de Génétique Médicale d'Alsace, INSERM U1112, Fédération de Médecine Translationnelle de Strasbourg, Université de Strasbourg, Strasbourg, France.,Service de Génétique Médicale, Hôpitaux Universitaires de Strasbourg, Strasbourg, France
| | - Jean Muller
- Laboratoire de Génétique Médicale, Institut de Génétique Médicale d'Alsace, INSERM U1112, Fédération de Médecine Translationnelle de Strasbourg, Université de Strasbourg, Strasbourg, France.,Laboratoire de Diagnostic Génétique, Hôpitaux Universitaires de Strasbourg, Strasbourg, France
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27
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Geets E, Meuwissen MEC, Van Hul W. Clinical, molecular genetics and therapeutic aspects of syndromic obesity. Clin Genet 2018; 95:23-40. [PMID: 29700824 DOI: 10.1111/cge.13367] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2018] [Revised: 04/05/2018] [Accepted: 04/16/2018] [Indexed: 12/13/2022]
Abstract
Obesity has become a major health problem worldwide. To date, more than 25 different syndromic forms of obesity are known in which one (monogenic) or multiple (polygenic) genes are involved. This review gives an overview of these forms and focuses more in detail on 6 syndromes: Prader Willi Syndrome and Prader Willi like phenotype, Bardet Biedl Syndrome, Alström Syndrome, Wilms tumor, Aniridia, Genitourinary malformations and mental Retardation syndrome and 16p11.2 (micro)deletions. Years of research provided plenty of information on the molecular genetics of these disorders and the obesity phenotype leading to a more individualized treatment of the symptoms, however, many questions still remain unanswered. As these obesity syndromes have different signs and symptoms in common, it makes it difficult to accurately diagnose patients which may result in inappropriate treatment of the disease. Therefore, the big challenge for clinicians and scientists is to more clearly differentiate all syndromic forms of obesity to provide conclusive genetic explanations and eventually deliver accurate genetic counseling and treatment. In addition, further delineation of the (functions of the) underlying genes with the use of array- or next-generation sequencing-based technology will be helpful to unravel the mechanisms of energy metabolism in the general population.
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Affiliation(s)
- E Geets
- Department of Medical Genetics, University of Antwerp and Antwerp University Hospital, Antwerp, Belgium
| | - M E C Meuwissen
- Department of Medical Genetics, University of Antwerp and Antwerp University Hospital, Antwerp, Belgium
| | - W Van Hul
- Department of Medical Genetics, University of Antwerp and Antwerp University Hospital, Antwerp, Belgium
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28
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Geoffroy V, Stoetzel C, Scheidecker S, Schaefer E, Perrault I, Bär S, Kröll A, Delbarre M, Antin M, Leuvrey AS, Henry C, Blanché H, Decker E, Kloth K, Klaus G, Mache C, Martin-Coignard D, McGinn S, Boland A, Deleuze JF, Friant S, Saunier S, Rozet JM, Bergmann C, Dollfus H, Muller J. Whole-genome sequencing in patients with ciliopathies uncovers a novel recurrent tandem duplication in IFT140. Hum Mutat 2018; 39:983-992. [PMID: 29688594 DOI: 10.1002/humu.23539] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2018] [Revised: 04/10/2018] [Accepted: 04/16/2018] [Indexed: 12/30/2022]
Abstract
Ciliopathies represent a wide spectrum of rare diseases with overlapping phenotypes and a high genetic heterogeneity. Among those, IFT140 is implicated in a variety of phenotypes ranging from isolated retinis pigmentosa to more syndromic cases. Using whole-genome sequencing in patients with uncharacterized ciliopathies, we identified a novel recurrent tandem duplication of exon 27-30 (6.7 kb) in IFT140, c.3454-488_4182+2588dup p.(Tyr1152_Thr1394dup), missed by whole-exome sequencing. Pathogenicity of the mutation was assessed on the patients' skin fibroblasts. Several hundreds of patients with a ciliopathy phenotype were screened and biallelic mutations were identified in 11 families representing 12 pathogenic variants of which seven are novel. Among those unrelated families especially with a Mainzer-Saldino syndrome, eight carried the same tandem duplication (two at the homozygous state and six at the heterozygous state). In conclusion, we demonstrated the implication of structural variations in IFT140-related diseases expanding its mutation spectrum. We also provide evidences for a unique genomic event mediated by an Alu-Alu recombination occurring on a shared haplotype. We confirm that whole-genome sequencing can be instrumental in the ability to detect structural variants for genomic disorders.
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Affiliation(s)
- Véronique Geoffroy
- Laboratoire de Génétique médicale, UMR_S INSERM U1112, IGMA, Faculté de Médecine FMTS, Université de Strasbourg, Strasbourg, France
| | - Corinne Stoetzel
- Laboratoire de Génétique médicale, UMR_S INSERM U1112, IGMA, Faculté de Médecine FMTS, Université de Strasbourg, Strasbourg, France
| | - Sophie Scheidecker
- Laboratoire de Génétique médicale, UMR_S INSERM U1112, IGMA, Faculté de Médecine FMTS, Université de Strasbourg, Strasbourg, France.,Laboratoires de Diagnostic Génétique, Hôpitaux Universitaires de Strasbourg, Strasbourg, France
| | - Elise Schaefer
- Laboratoire de Génétique médicale, UMR_S INSERM U1112, IGMA, Faculté de Médecine FMTS, Université de Strasbourg, Strasbourg, France.,Service de Génétique Médicale, Hôpitaux Universitaires de Strasbourg, Strasbourg, France
| | - Isabelle Perrault
- Laboratory of Genetics in Ophthalmology (LGO), INSERM UMR1163, Institute of Genetic Diseases, Imagine, Paris Descartes University, Paris, France
| | - Séverine Bär
- Department of Molecular and Cellular Genetics, UMR7156, Centre National de Recherche Scientifique (CNRS), Université de Strasbourg, Strasbourg, France
| | - Ariane Kröll
- Laboratoire de Génétique médicale, UMR_S INSERM U1112, IGMA, Faculté de Médecine FMTS, Université de Strasbourg, Strasbourg, France
| | - Marion Delbarre
- Laboratoires de Diagnostic Génétique, Hôpitaux Universitaires de Strasbourg, Strasbourg, France
| | - Manuela Antin
- Laboratoires de Diagnostic Génétique, Hôpitaux Universitaires de Strasbourg, Strasbourg, France
| | - Anne-Sophie Leuvrey
- Laboratoires de Diagnostic Génétique, Hôpitaux Universitaires de Strasbourg, Strasbourg, France
| | | | - Hélène Blanché
- Centre d'études du polymorphisme humain-Fondation Jean Dausset, Paris, France
| | - Eva Decker
- Center for Human Genetics, Bioscientia, Ingelheim, Germany
| | - Katja Kloth
- Institut für Humangenetik, Universitätsklinikum Hamburg-Eppendorf, Hamburg, Germany
| | - Günter Klaus
- University Marburg, KfH-Nierenzentrum für Kinder und Jugendliche, Marburg, Germany
| | - Christoph Mache
- Department of Pediatrics, Medical University of Graz, Graz, Austria
| | | | - Steven McGinn
- CNRGH, Institut de Biologie François Jacob, DRF, CEA, Evry, France
| | - Anne Boland
- CNRGH, Institut de Biologie François Jacob, DRF, CEA, Evry, France
| | - Jean-François Deleuze
- Centre d'études du polymorphisme humain-Fondation Jean Dausset, Paris, France.,CNRGH, Institut de Biologie François Jacob, DRF, CEA, Evry, France
| | - Sylvie Friant
- Department of Molecular and Cellular Genetics, UMR7156, Centre National de Recherche Scientifique (CNRS), Université de Strasbourg, Strasbourg, France
| | | | - Jean-Michel Rozet
- Laboratory of Genetics in Ophthalmology (LGO), INSERM UMR1163, Institute of Genetic Diseases, Imagine, Paris Descartes University, Paris, France
| | - Carsten Bergmann
- Center for Human Genetics, Bioscientia, Ingelheim, Germany.,Department of Medicine, University Hospital Freiburg, Freiburg, Germany
| | - Hélène Dollfus
- Laboratoire de Génétique médicale, UMR_S INSERM U1112, IGMA, Faculté de Médecine FMTS, Université de Strasbourg, Strasbourg, France.,Centre de Référence pour les affections rares en génétique ophtalmologique, CARGO, Filière SENSGENE, Hôpitaux Universitaires de Strasbourg, Strasbourg, France
| | - Jean Muller
- Laboratoire de Génétique médicale, UMR_S INSERM U1112, IGMA, Faculté de Médecine FMTS, Université de Strasbourg, Strasbourg, France.,Laboratoires de Diagnostic Génétique, Hôpitaux Universitaires de Strasbourg, Strasbourg, France
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Sanchez-Navarro I, R J da Silva L, Blanco-Kelly F, Zurita O, Sanchez-Bolivar N, Villaverde C, Lopez-Molina MI, Garcia-Sandoval B, Tahsin-Swafiri S, Minguez P, Riveiro-Alvarez R, Lorda I, Sanchez-Alcudia R, Perez-Carro R, Valverde D, Liu Y, Tian L, Hakonarson H, Avila-Fernandez A, Corton M, Ayuso C. Combining targeted panel-based resequencing and copy-number variation analysis for the diagnosis of inherited syndromic retinopathies and associated ciliopathies. Sci Rep 2018; 8:5285. [PMID: 29588463 PMCID: PMC5869593 DOI: 10.1038/s41598-018-23520-1] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2017] [Accepted: 03/13/2018] [Indexed: 01/29/2023] Open
Abstract
Inherited syndromic retinopathies are a highly heterogeneous group of diseases that involve retinal anomalies and systemic manifestations. They include retinal ciliopathies, other well-defined clinical syndromes presenting with retinal alterations and cases of non-specific multisystemic diseases. The heterogeneity of these conditions makes molecular and clinical characterization of patients challenging in daily clinical practice. We explored the capacity of targeted resequencing and copy-number variation analysis to improve diagnosis of a heterogeneous cohort of 47 patients mainly comprising atypical cases that did not clearly fit a specific clinical diagnosis. Thirty-three likely pathogenic variants were identified in 18 genes (ABCC6, ALMS1, BBS1, BBS2, BBS12, CEP41, CEP290, IFT172, IFT27, MKKS, MYO7A, OTX2, PDZD7, PEX1, RPGRIP1, USH2A, VPS13B, and WDPCP). Molecular findings and additional clinical reassessments made it possible to accurately characterize 14 probands (30% of the total). Notably, clinical refinement of complex phenotypes was achieved in 4 cases, including 2 de novo OTX2-related syndromes, a novel phenotypic association for the ciliary CEP41 gene, and the co-existence of biallelic USH2A variants and a Koolen-de-Vries syndrome-related 17q21.31 microdeletion. We demonstrate that combining next-generation sequencing and CNV analysis is a comprehensive and useful approach to unravel the extensive phenotypic and genotypic complexity of inherited syndromic retinopathies.
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Affiliation(s)
- Iker Sanchez-Navarro
- Department of Genetics, Instituto de Investigaciones Sanitarias - Fundacion Jiménez Díaz University Hospital (IIS-FJD-UAM), Madrid, Spain.,Centre for Biomedical Network Research on Rare Diseases (CIBERER), ISCIII, Madrid, Spain
| | - Luciana R J da Silva
- Department of Genetics, Instituto de Investigaciones Sanitarias - Fundacion Jiménez Díaz University Hospital (IIS-FJD-UAM), Madrid, Spain.,Universidade de Mogi das Cruzes, São Paulo, Brazil
| | - Fiona Blanco-Kelly
- Department of Genetics, Instituto de Investigaciones Sanitarias - Fundacion Jiménez Díaz University Hospital (IIS-FJD-UAM), Madrid, Spain.,Centre for Biomedical Network Research on Rare Diseases (CIBERER), ISCIII, Madrid, Spain
| | - Olga Zurita
- Department of Genetics, Instituto de Investigaciones Sanitarias - Fundacion Jiménez Díaz University Hospital (IIS-FJD-UAM), Madrid, Spain.,Centre for Biomedical Network Research on Rare Diseases (CIBERER), ISCIII, Madrid, Spain
| | - Noelia Sanchez-Bolivar
- Department of Genetics, Instituto de Investigaciones Sanitarias - Fundacion Jiménez Díaz University Hospital (IIS-FJD-UAM), Madrid, Spain
| | - Cristina Villaverde
- Department of Genetics, Instituto de Investigaciones Sanitarias - Fundacion Jiménez Díaz University Hospital (IIS-FJD-UAM), Madrid, Spain.,Centre for Biomedical Network Research on Rare Diseases (CIBERER), ISCIII, Madrid, Spain
| | | | | | - Saoud Tahsin-Swafiri
- Department of Genetics, Instituto de Investigaciones Sanitarias - Fundacion Jiménez Díaz University Hospital (IIS-FJD-UAM), Madrid, Spain
| | - Pablo Minguez
- Department of Genetics, Instituto de Investigaciones Sanitarias - Fundacion Jiménez Díaz University Hospital (IIS-FJD-UAM), Madrid, Spain
| | - Rosa Riveiro-Alvarez
- Department of Genetics, Instituto de Investigaciones Sanitarias - Fundacion Jiménez Díaz University Hospital (IIS-FJD-UAM), Madrid, Spain.,Centre for Biomedical Network Research on Rare Diseases (CIBERER), ISCIII, Madrid, Spain
| | - Isabel Lorda
- Department of Genetics, Instituto de Investigaciones Sanitarias - Fundacion Jiménez Díaz University Hospital (IIS-FJD-UAM), Madrid, Spain.,Centre for Biomedical Network Research on Rare Diseases (CIBERER), ISCIII, Madrid, Spain
| | - Rocío Sanchez-Alcudia
- Department of Genetics, Instituto de Investigaciones Sanitarias - Fundacion Jiménez Díaz University Hospital (IIS-FJD-UAM), Madrid, Spain.,Centre for Biomedical Network Research on Rare Diseases (CIBERER), ISCIII, Madrid, Spain
| | - Raquel Perez-Carro
- Department of Genetics, Instituto de Investigaciones Sanitarias - Fundacion Jiménez Díaz University Hospital (IIS-FJD-UAM), Madrid, Spain
| | - Diana Valverde
- Department of Biochemistry, Genetics and Immunology, Faculty of Biology, Universidad de Vigo, Vigo, Spain
| | - Yichuan Liu
- Center for Applied Genomics, Abramson Pediatric Research Center, The Children's Hospital of Philadelphia, Philadelphia, PA, USA.,Medical Scientist Training Program, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA
| | - Lifeng Tian
- Center for Applied Genomics, Abramson Pediatric Research Center, The Children's Hospital of Philadelphia, Philadelphia, PA, USA
| | - Hakon Hakonarson
- Center for Applied Genomics, Abramson Pediatric Research Center, The Children's Hospital of Philadelphia, Philadelphia, PA, USA.,Division of Human Genetics, Children's Hospital of Philadelphia, Philadelphia, PA, USA.,The Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA
| | - Almudena Avila-Fernandez
- Department of Genetics, Instituto de Investigaciones Sanitarias - Fundacion Jiménez Díaz University Hospital (IIS-FJD-UAM), Madrid, Spain.,Centre for Biomedical Network Research on Rare Diseases (CIBERER), ISCIII, Madrid, Spain
| | - Marta Corton
- Department of Genetics, Instituto de Investigaciones Sanitarias - Fundacion Jiménez Díaz University Hospital (IIS-FJD-UAM), Madrid, Spain. .,Centre for Biomedical Network Research on Rare Diseases (CIBERER), ISCIII, Madrid, Spain.
| | - Carmen Ayuso
- Department of Genetics, Instituto de Investigaciones Sanitarias - Fundacion Jiménez Díaz University Hospital (IIS-FJD-UAM), Madrid, Spain. .,Centre for Biomedical Network Research on Rare Diseases (CIBERER), ISCIII, Madrid, Spain.
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Kinesin 1 regulates cilia length through an interaction with the Bardet-Biedl syndrome related protein CCDC28B. Sci Rep 2018; 8:3019. [PMID: 29445114 PMCID: PMC5813027 DOI: 10.1038/s41598-018-21329-6] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2017] [Accepted: 02/02/2018] [Indexed: 01/12/2023] Open
Abstract
Bardet-Biedl syndrome (BBS) is a ciliopathy characterized by retinal degeneration, obesity, polydactyly, renal disease and mental retardation. CCDC28B is a BBS-associated protein that we have previously shown plays a role in cilia length regulation whereby its depletion results in shortened cilia both in cells and Danio rerio (zebrafish). At least part of that role is achieved by its interaction with the mTORC2 component SIN1, but the mechanistic details of this interaction and/or additional functions that CCDC28B might play in the context of cilia remain poorly understood. Here we uncover a novel interaction between CCDC28B and the kinesin 1 molecular motor that is relevant to cilia. CCDC28B interacts with kinesin light chain 1 (KLC1) and the heavy chain KIF5B. Notably, depletion of these kinesin 1 components results in abnormally elongated cilia. Furthermore, through genetic interaction studies we demonstrate that kinesin 1 regulates ciliogenesis through CCDC28B. We show that kinesin 1 regulates the subcellular distribution of CCDC28B, unexpectedly, inhibiting its nuclear accumulation, and a ccdc28b mutant missing a nuclear localization motif fails to rescue the phenotype in zebrafish morphant embryos. Therefore, we uncover a previously unknown role of kinesin 1 in cilia length regulation that relies on the BBS related protein CCDC28B.
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Yıldız Bölükbaşı E, Mumtaz S, Afzal M, Woehlbier U, Malik S, Tolun A. Homozygous mutation in CEP19, a gene mutated in morbid obesity, in Bardet-Biedl syndrome with predominant postaxial polydactyly. J Med Genet 2017; 55:189-197. [DOI: 10.1136/jmedgenet-2017-104758] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2017] [Revised: 10/16/2017] [Accepted: 10/29/2017] [Indexed: 11/04/2022]
Abstract
BackgroundBardet-Biedl syndrome (BBS) is a ciliopathy with extensive phenotypic variability and genetic heterogeneity. We aimed to discover the gene mutated in a consanguineous kindred with multiple cases of a BBS phenotype.MethodsSNP genotype data were used for linkage analysis and exome sequencing to identify mutations. Modelling and in silico analysis were performed to predict mutation severity.ResultsPatients had postaxial polydactyly plus variable other clinical features including rod-cone dystrophy, obesity, intellectual disability, renal malformation, developmental delay, dental anomalies, speech disorder and enlarged fatty liver. The 4.57 Mb disease locus harboured homozygous, truncating CEP19 c.194_195insA (p.Tyr65*) mutation. We also found glioma-associated oncogene homolog 1(GLI1) c.820G>C (p.Gly274Arg) in the homozygous state in most patients. In silico modelling strongly suggests that it is damaging. Also, different combinations of four possible modifier alleles in BBS-related genes were detected. Two are known modifier alleles for BBS, splicing variant CCDC28B c.330C>T and missense MKKS/BBS6 p.Ile339Val, and the others are C8ORF37/BBS21 p.Ala178Val and TMEM67/BBS14 modifier p.Asp799Asp. Some patients carry all those five known/possible modifier alleles. Such variants are highly significantly more abundant in our patients than in a control group.ConclusionCEP19 encodes a centrosomal and ciliary protein, as all BBS genes do. Another truncating mutation p.Arg82* has been reported as responsible for morbid obesity in a family; however, in the family we present, not all homozygotes are obese, although some are severely obese. The variant in GLI1, encoding a transcription factor that localises to the primary cilium and nucleus and is a mediator of the sonic hedgehog pathway, possibly exacerbates disease severity when in the homozygous state.
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Wang Y, Garraoui A, Zeng L, Lai M, He F, Wang H, Jiang C, Chen Y, Dai L, Fan N, Yang H, Zhang J, Liu X. FBN3 gene involved in pathogenesis of a Chinese family with Bardet-Biedl syndrome. Oncotarget 2017; 8:86718-86725. [PMID: 29156830 PMCID: PMC5689720 DOI: 10.18632/oncotarget.21415] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2017] [Accepted: 08/29/2017] [Indexed: 01/19/2023] Open
Abstract
Purpose This study was designed to evaluate the molecular genetics of a Chinese family with Bardet-Biedl syndrome (BBS). Methods All the family members underwent medical history evaluation, ophthalmologic and physical examinations. Whole exome sequencing was performed on two affected individuals and their parents. All variants were verified in all family members by PCR amplification and Sanger sequencing. Results Patients in this family were diagnosed as Bardet-Biedl syndrome, with an inheritance pattern of autosomal recessive. Compound heterozygous mutations of the FBN3 gene (c.3616G>A and c.6037C>T) were identified by whole exome sequencing. Results from Sanger sequencing showed co-segregation of these compound heterozygous mutations in the FBN3 gene with BBS disease in the family. Conclusion Novel compound heterozygous mutations c.3616G>A and c.6037C>T of FBN3 were identified in all affected individuals but not in the unaffected family members. This is the first time to the best of our knowledge, that the FBN3 gene is involved in the pathogenesis of BBS. This study will expand our understanding about the gene spectrum related to this genetically heterogeneous disorder.
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Affiliation(s)
- Yun Wang
- Shenzhen Key Laboratory of Ophthalmology, Shenzhen Eye Hospital, Shenzhen University, Shenzhen, China
| | - Abir Garraoui
- BGI-Shenzhen, Shenzhen, China.,Laboratory of Human Molecular Genetics, Faculty of Medicine, University of Sfax, Sfax, Tunisia
| | - Liuzhi Zeng
- The First People's Hospital of Chengdu, Chengdu, China
| | - Mingying Lai
- Shenzhen Key Laboratory of Ophthalmology, Shenzhen Eye Hospital, Shenzhen University, Shenzhen, China
| | - Fen He
- Shenzhen Key Laboratory of Ophthalmology, Shenzhen Eye Hospital, Shenzhen University, Shenzhen, China
| | - Huaizhou Wang
- Beijing Institute of Ophthalmology, Beijing Tongren Eye Center, Beijing Tongren Hospital, Beijing Ophthalmology & Visual Sciences Key Laboratory, Capital Medical University, Beijing, China
| | | | | | | | - Ning Fan
- Shenzhen Key Laboratory of Ophthalmology, Shenzhen Eye Hospital, Shenzhen University, Shenzhen, China
| | - Huanming Yang
- BGI-Shenzhen, Shenzhen, China.,James D. Watson Institute of Genome Sciences, Hangzhou, China
| | - Jianguo Zhang
- BGI-Shenzhen, Shenzhen, China.,Shenzhen Key Laboratory of Neurogenomics, BGI-Shenzhen, Shenzhen, China
| | - Xuyang Liu
- Shenzhen Key Laboratory of Ophthalmology, Shenzhen Eye Hospital, Shenzhen University, Shenzhen, China
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Priya S, Nampoothiri S, Sen P, Sripriya S. Bardet-Biedl syndrome: Genetics, molecular pathophysiology, and disease management. Indian J Ophthalmol 2017; 64:620-627. [PMID: 27853007 PMCID: PMC5151149 DOI: 10.4103/0301-4738.194328] [Citation(s) in RCA: 60] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023] Open
Abstract
Primary cilia play a key role in sensory perception and various signaling pathways. Any defect in them leads to group of disorders called ciliopathies, and Bardet–Biedl syndrome (BBS, OMIM 209900) is one among them. The disorder is clinically and genetically heterogeneous, with various primary and secondary clinical manifestations, and shows autosomal recessive inheritance and highly prevalent in inbred/consanguineous populations. The disease mapped to at least twenty different genes (BBS1-BBS20), follow oligogenic inheritance pattern. BBS proteins localizes to the centerosome and regulates the biogenesis and functions of the cilia. In BBS, the functioning of various systemic organs (with ciliated cells) gets deranged and results in systemic manifestations. Certain components of the disease (such as obesity, diabetes, and renal problems) when noticed earlier offer a disease management benefit to the patients. However, the awareness of the disease is comparatively low and most often noticed only after severe vision loss in patients, which is usually in the first decade of the patient's age. In the current review, we have provided the recent updates retrieved from various types of scientific literature through journals, on the genetics, its molecular relevance, and the clinical outcome in BBS. The review in nutshell would provide the basic awareness of the disease that will have an impact in disease management and counseling benefits to the patients and their families.
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Affiliation(s)
- Sathya Priya
- SNONGC Department of Genetics and Molecular Biology, Kamal Nayan Institute for Research in Vision and Ophthalmology, Vision Research Foundation, Chennai, Tamil Nadu; School of Chemical and Biotechnology, SASTRA University, Thanjavur, Tamil Nadu, India
| | - Sheela Nampoothiri
- Department of Pediatric Genetics, Amrita Institute of Medical Sciences and Research Center, Cochin, Kerala, India
| | - Parveen Sen
- Department of Vitreoretina Clinic, Medical Research Foundation, Chennai, Tamil Nadu, India
| | - S Sripriya
- SNONGC Department of Genetics and Molecular Biology, Kamal Nayan Institute for Research in Vision and Ophthalmology, Vision Research Foundation, Chennai, Tamil Nadu, India
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Chen J, Geberhiwot T, Barrett TG, Paisey R, Semple RK. Refining genotype-phenotype correlation in Alström syndrome through study of primary human fibroblasts. Mol Genet Genomic Med 2017; 5:390-404. [PMID: 28717663 PMCID: PMC5511801 DOI: 10.1002/mgg3.296] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2017] [Revised: 04/11/2017] [Accepted: 04/13/2017] [Indexed: 02/02/2023] Open
Abstract
BACKGROUND Alström syndrome (AS), featuring retinal dystrophy, neuronal deafness, cardiomyopathy, metabolic syndrome, and diffuse fibrosis, is caused by biallelic mutations in the centrosomal protein ALMS1. Genotype-phenotype correlation has been suggested without assessment of ALMS1 expression. METHODS ALMS1 expression (real-time PCR and immunocytochemistry) and cilia formation (immunocytochemistry) were assessed in fibroblasts from deeply phenotyped volunteers diagnosed with AS recruited from a dedicated AS Service. Exome sequencing was used in two participants without convincing biallelic ALMS1 mutations, and BBS2 (Bardet-Biedl syndrome 2) protein expression was assessed in one patient with biallelic BBS2 mutations. Hedgehog-induced GLI1 expression and PDGFA signaling was assessed using quantitative real-time PCR, immunoblotting, or immunostaining of fixed cells after stimulation. RESULTS In 16 of the patient cell lines examined, ALMS1 protein was undetectable (14 with biallelic loss-of-function (LoF) mutations), and in two, ALMS1 staining was equivocal (one with biallelic LoF mutations). In five lines, ALMS1 expression was normal using at least one fixation method (one with biallelic LoF mutations). These differences were not accounted for by major differences in ALMS1 mRNA expression. Exome sequencing of two participants with normal ALMS1 expression identified biallelic LoF BBS2 mutations in one. No second, known ciliopathy mutation was found in the other patient, who had one LoF ALMS1 mutation. Phenotypes were milder or atypical in participants with preserved ALMS1 immunostaining, even when two with likely alternative genetic diagnoses were excluded. All cells studied developed normal cilia, ALMS1 and BBS2 mutant cells showed normal Hedgehog-induced upregulation of GLI1 expression, and PDGFA signaling was normal in ALMS1-deficient cells. CONCLUSION Milder or atypical presentations of AS should prompt genetic evaluation for alternative, clinically overlapping ciliopathies. A subgroup of patients with bona fide ALMS1 defects have milder phenotypes due to residual ALMS1 expression, which may be more important than mutation site.
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Affiliation(s)
- Jian‐Hua Chen
- Wellcome Trust‐MRC Institute of Metabolic ScienceUniversity of CambridgeCambridgeUK
- The National Institute for Health Research Cambridge Biomedical Research CentreCambridgeUK
| | | | | | - Richard Paisey
- South Devon Healthcare NHS Foundation TrustTorbay HospitalTorquayUK
| | - Robert K. Semple
- Wellcome Trust‐MRC Institute of Metabolic ScienceUniversity of CambridgeCambridgeUK
- The National Institute for Health Research Cambridge Biomedical Research CentreCambridgeUK
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Mitchison HM, Valente EM. Motile and non-motile cilia in human pathology: from function to phenotypes. J Pathol 2017; 241:294-309. [PMID: 27859258 DOI: 10.1002/path.4843] [Citation(s) in RCA: 292] [Impact Index Per Article: 41.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2016] [Revised: 11/03/2016] [Accepted: 11/04/2016] [Indexed: 12/13/2022]
Abstract
Ciliopathies are inherited human disorders caused by both motile and non-motile cilia dysfunction that form an important and rapidly expanding disease category. Ciliopathies are complex conditions to diagnose, being multisystem disorders characterized by extensive genetic heterogeneity and clinical variability with high levels of lethality. There is marked phenotypic overlap among distinct ciliopathy syndromes that presents a major challenge for their recognition, diagnosis, and clinical management, in addition to posing an on-going task to develop the most appropriate family counselling. The impact of next-generation sequencing and high-throughput technologies in the last decade has significantly improved our understanding of the biological basis of ciliopathy disorders, enhancing our ability to determine the possible reasons for the extensive overlap in their symptoms and genetic aetiologies. Here, we review the diverse functions of cilia in human health and disease and discuss a growing shift away from the classical clinical definitions of ciliopathy syndromes to a more functional categorization. This approach arises from our improved understanding of this unique organelle, revealed through new genetic and cell biological insights into the discrete functioning of subcompartments of the cilium (basal body, transition zone, intraflagellar transport, motility). Mutations affecting these distinct ciliary protein modules can confer different genetic diseases and new clinical classifications are possible to define, according to the nature and extent of organ involvement. Copyright © 2016 Pathological Society of Great Britain and Ireland. Published by John Wiley & Sons, Ltd.
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Affiliation(s)
- Hannah M Mitchison
- Genetics and Genomic Medicine Programme, University College London, UCL Great Ormond Street Institute of Child Health, 30 Guilford Street, London, WC1N 1EH, UK
| | - Enza Maria Valente
- Department of Medicine and Surgery, University of Salerno, Salerno, Italy.,Neurogenetics Unit, IRCCS Santa Lucia Foundation, Via del Fosso di Fiorano, 00143, Rome, Italy
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Panel-Based Clinical Genetic Testing in 85 Children with Inherited Retinal Disease. Ophthalmology 2017; 124:985-991. [PMID: 28341476 DOI: 10.1016/j.ophtha.2017.02.005] [Citation(s) in RCA: 39] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2016] [Revised: 02/03/2017] [Accepted: 02/06/2017] [Indexed: 11/20/2022] Open
Abstract
PURPOSE To assess the clinical usefulness of genetic testing in a pediatric population with inherited retinal disease (IRD). DESIGN Single-center retrospective case series. PARTICIPANTS Eighty-five unrelated children with a diagnosis of isolated or syndromic IRD who were referred for clinical genetic testing between January 2014 and July 2016. METHODS Participants underwent a detailed ophthalmic examination, accompanied by electrodiagnostic testing (EDT) and dysmorphologic assessment where appropriate. Ocular and extraocular features were recorded using Human Phenotype Ontology terms. Subsequently, multigene panel testing (105 or 177 IRD-associated genes) was performed in an accredited diagnostic laboratory, followed by clinical variant interpretation. MAIN OUTCOME MEASURES Diagnostic yield and clinical usefulness of genetic testing. RESULTS Overall, 78.8% of patients (n = 67) received a probable molecular diagnosis; 7.5% (n = 5) of these had autosomal dominant disease, 25.4% (n = 17) had X-linked disease, and 67.2% (n = 45) had autosomal recessive disease. In a further 5.9% of patients (n = 5), a single heterozygous ABCA4 variant was identified; all these participants had a spectrum of clinical features consistent with ABCA4 retinopathy. Most participants (84.7%; n = 72) had undergone EDT and 81.9% (n = 59) of these patients received a probable molecular diagnosis. The genes most frequently mutated in the present cohort were CACNA1F and ABCA4, accounting for 14.9% (n = 10) and 11.9% (n = 8) of diagnoses respectively. Notably, in many cases, genetic testing helped to distinguish stationary from progressive IRD subtypes and to establish a precise diagnosis in a timely fashion. CONCLUSIONS Multigene panel testing pointed to a molecular diagnosis in 84.7% of children with IRD. The diagnostic yield in the study population was significantly higher compared with that in previously reported unselected IRD cohorts. Approaches similar to the one described herein are expected to become a standard component of care in pediatric ophthalmology. We propose the introduction of genetic testing early in the diagnostic pathway in children with clinical and/or electrophysiologic findings, suggestive of IRD.
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SCA13 causes dominantly inherited non-progressive myoclonus ataxia. Parkinsonism Relat Disord 2017; 38:80-84. [PMID: 28216058 DOI: 10.1016/j.parkreldis.2017.02.012] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/19/2016] [Revised: 01/25/2017] [Accepted: 02/09/2017] [Indexed: 01/26/2023]
Abstract
INTRODUCTION Spinocerebellar ataxia 13 (SCA13) is a rare autosomal dominant cerebellar ataxia. To our knowledge, its association to movement disorders has never been described. We aimed at reporting 8 new SCA13 cases with a focus on movement disorders especially myoclonus. METHODS We performed a detailed neurological examination and neurophysiological recording in 8 patients consecutively diagnosed with SCA13 between December 2013 and October 2015 and followed up in two French tertiary centers. RESULTS We identified mild subcortical myoclonus in all patients, with a homogenous clinical and electrophysiological pattern. Myoclonus ataxia was very slowly progressive, like the other symptoms of the disease, whatever the age of onset. Patients with R423H mutation had an earlier age of onset than patients with R420H mutation. CONCLUSIONS Myoclonus appears to be frequent in SCA13. SCA13 should be considered facing non-progressive autosomal dominant myoclonus ataxia, and polymyographic recording should be included in the diagnosis work.
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Intragenic FMR1 disease-causing variants: a significant mutational mechanism leading to Fragile-X syndrome. Eur J Hum Genet 2017; 25:423-431. [PMID: 28176767 DOI: 10.1038/ejhg.2016.204] [Citation(s) in RCA: 44] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2016] [Revised: 12/07/2016] [Accepted: 12/14/2016] [Indexed: 11/09/2022] Open
Abstract
Fragile-X syndrome (FXS) is a frequent genetic form of intellectual disability (ID). The main recurrent mutagenic mechanism causing FXS is the expansion of a CGG repeat sequence in the 5'-UTR of the FMR1 gene, therefore, routinely tested in ID patients. We report here three FMR1 intragenic pathogenic variants not affecting this sequence, identified using high-throughput sequencing (HTS): a previously reported hemizygous deletion encompassing the last exon of FMR1, too small to be detected by array-CGH and inducing decreased expression of a truncated form of FMRP protein, in three brothers with ID (family 1) and two splice variants in boys with sporadic ID: a de novo variant c.990+1G>A (family 2) and a maternally inherited c.420-8A>G variant (family 3). After clinical reevaluation, the five patients presented features consistent with FXS (mean Hagerman's scores=15). We conducted a systematic review of all rare non-synonymous variants previously reported in FMR1 in ID patients and showed that six of them are convincing pathogenic variants. This study suggests that intragenic FMR1 variants, although much less frequent than CGG expansions, are a significant mutational mechanism leading to FXS and demonstrates the interest of HTS approaches to detect them in ID patients with a negative standard work-up.
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Thomas CP, Mansilla MA, Sompallae R, Mason SO, Nishimura CJ, Kimble MJ, Campbell CA, Kwitek AE, Darbro BW, Stewart ZA, Smith RJH. Screening of Living Kidney Donors for Genetic Diseases Using a Comprehensive Genetic Testing Strategy. Am J Transplant 2017; 17:401-410. [PMID: 27434427 PMCID: PMC5297870 DOI: 10.1111/ajt.13970] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2016] [Revised: 06/20/2016] [Accepted: 07/12/2016] [Indexed: 01/25/2023]
Abstract
Related living kidney donors (LKDs) are at higher risk of end-stage renal disease (ESRD) compared with unrelated LKDs. A genetic panel was developed to screen 115 genes associated with renal diseases. We used this panel to screen six negative controls, four transplant candidates with presumed genetic renal disease and six related LKDs. After removing common variants, pathogenicity was predicted using six algorithms to score genetic variants based on conservation and function. All variants were evaluated in the context of patient phenotype and clinical data. We identified causal variants in three of the four transplant candidates. Two patients with a family history of autosomal dominant polycystic kidney disease segregated variants in PKD1. These findings excluded genetic risk in three of four relatives accepted as potential LKDs. A third patient with an atypical history for Alport syndrome had a splice site mutation in COL4A5. This pathogenic variant was excluded in a sibling accepted as an LKD. In another patient with a strong family history of ESRD, a negative genetic screen combined with negative comparative genomic hybridization in the recipient facilitated counseling of the related donor. This genetic renal disease panel will allow rapid, efficient and cost-effective evaluation of related LKDs.
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Affiliation(s)
- C. P. Thomas
- Department of Internal MedicineCarver College of MedicineUniversity of IowaIowa CityIA,Department of PediatricsCarver College of MedicineUniversity of IowaIowa CityIA,VA Medical CenterIowa CityIA
| | - M. A. Mansilla
- Iowa Institute of Human GeneticsCarver College of MedicineUniversity of IowaIowa CityIA
| | - R. Sompallae
- Iowa Institute of Human GeneticsCarver College of MedicineUniversity of IowaIowa CityIA
| | - S. O. Mason
- Iowa Institute of Human GeneticsCarver College of MedicineUniversity of IowaIowa CityIA
| | - C. J. Nishimura
- Iowa Institute of Human GeneticsCarver College of MedicineUniversity of IowaIowa CityIA
| | - M. J. Kimble
- Iowa Institute of Human GeneticsCarver College of MedicineUniversity of IowaIowa CityIA
| | - C. A. Campbell
- Department of Internal MedicineCarver College of MedicineUniversity of IowaIowa CityIA,Iowa Institute of Human GeneticsCarver College of MedicineUniversity of IowaIowa CityIA
| | - A. E. Kwitek
- Iowa Institute of Human GeneticsCarver College of MedicineUniversity of IowaIowa CityIA,Department of PharmacologyCarver College of MedicineUniversity of IowaIowa CityIA
| | - B. W. Darbro
- Department of PediatricsCarver College of MedicineUniversity of IowaIowa CityIA,Interdisciplinary Program in GeneticsUniversity of IowaIowa CityIA,The Holden Comprehensive Cancer CenterUniversity of IowaIowa CityIA
| | - Z. A. Stewart
- Department of SurgeryDivision of Transplant SurgeryCarver College of MedicineUniversity of IowaIowa CityIA
| | - R. J. H. Smith
- Department of Internal MedicineCarver College of MedicineUniversity of IowaIowa CityIA,Department of PediatricsCarver College of MedicineUniversity of IowaIowa CityIA,Iowa Institute of Human GeneticsCarver College of MedicineUniversity of IowaIowa CityIA,Interdisciplinary Program in GeneticsUniversity of IowaIowa CityIA,Department of OtorhinolaryngologyCarver College of MedicineUniversity of IowaIowa CityIA
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Stoetzel C, Bär S, De Craene JO, Scheidecker S, Etard C, Chicher J, Reck JR, Perrault I, Geoffroy V, Chennen K, Strähle U, Hammann P, Friant S, Dollfus H. A mutation in VPS15 (PIK3R4) causes a ciliopathy and affects IFT20 release from the cis-Golgi. Nat Commun 2016; 7:13586. [PMID: 27882921 PMCID: PMC5123056 DOI: 10.1038/ncomms13586] [Citation(s) in RCA: 44] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2015] [Accepted: 10/18/2016] [Indexed: 11/25/2022] Open
Abstract
Ciliopathies are a group of diseases that affect kidney and retina among other organs. Here, we identify a missense mutation in PIK3R4 (phosphoinositide 3-kinase regulatory subunit 4, named VPS15) in a family with a ciliopathy phenotype. Besides being required for trafficking and autophagy, we show that VPS15 regulates primary cilium length in human fibroblasts, as well as ciliary processes in zebrafish. Furthermore, we demonstrate its interaction with the golgin GM130 and its localization to the Golgi. The VPS15-R998Q patient mutation impairs Golgi trafficking functions in humanized yeast cells. Moreover, in VPS15-R998Q patient fibroblasts, the intraflagellar transport protein IFT20 is not localized to vesicles trafficking to the cilium but is restricted to the Golgi. Our findings suggest that at the Golgi, VPS15 and GM130 form a protein complex devoid of VPS34 to ensure the IFT20-dependent sorting and transport of membrane proteins from the cis-Golgi to the primary cilium. VPS15 is known as a VPS34-associated protein that functions in intracellular trafficking and autophagy. Here the authors identify a role for VPS15 in ciliopathy and ciliary phenotypes, and show that it interacts with GM130 and functions in IFT20-dependent cis-Golgi to cilium trafficking.
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Affiliation(s)
- Corinne Stoetzel
- Medical Genetics Laboratory, INSERM U1112, Institute of Medical Genetics of Alsace, University of Strasbourg, Strasbourg Medical School, 67000 Strasbourg, France
| | - Séverine Bär
- Department of Molecular and Cellular Genetics, UMR7156, Centre National de Recherche Scientifique (CNRS), Université de Strasbourg, 67084 Strasbourg, France
| | - Johan-Owen De Craene
- Department of Molecular and Cellular Genetics, UMR7156, Centre National de Recherche Scientifique (CNRS), Université de Strasbourg, 67084 Strasbourg, France
| | - Sophie Scheidecker
- Medical Genetics Laboratory, INSERM U1112, Institute of Medical Genetics of Alsace, University of Strasbourg, Strasbourg Medical School, 67000 Strasbourg, France
| | - Christelle Etard
- Institut für Toxikologie und Genetik, Campus Nord, Karlsruher Institut für Technologie, Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein Leopoldshafen, Germany
| | - Johana Chicher
- Institut de Biologie Moléculaire et Cellulaire (IBMC), Plateforme Protéomique Strasbourg-Esplanade, CNRS FRC1589, 67084 Strasbourg, France
| | - Jennifer R Reck
- Department of Molecular and Cellular Genetics, UMR7156, Centre National de Recherche Scientifique (CNRS), Université de Strasbourg, 67084 Strasbourg, France
| | - Isabelle Perrault
- Laboratory of Genetics in Ophthalmology, INSERM UMR1163, Institut Imagine, Université Paris Descartes Sorbonne Paris Cité, Hôpital Necker, 75015 Paris, France
| | - Véronique Geoffroy
- Medical Genetics Laboratory, INSERM U1112, Institute of Medical Genetics of Alsace, University of Strasbourg, Strasbourg Medical School, 67000 Strasbourg, France
| | - Kirsley Chennen
- Medical Genetics Laboratory, INSERM U1112, Institute of Medical Genetics of Alsace, University of Strasbourg, Strasbourg Medical School, 67000 Strasbourg, France
| | - Uwe Strähle
- Institut für Toxikologie und Genetik, Campus Nord, Karlsruher Institut für Technologie, Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein Leopoldshafen, Germany
| | - Philippe Hammann
- Institut de Biologie Moléculaire et Cellulaire (IBMC), Plateforme Protéomique Strasbourg-Esplanade, CNRS FRC1589, 67084 Strasbourg, France
| | - Sylvie Friant
- Department of Molecular and Cellular Genetics, UMR7156, Centre National de Recherche Scientifique (CNRS), Université de Strasbourg, 67084 Strasbourg, France
| | - Hélène Dollfus
- Medical Genetics Laboratory, INSERM U1112, Institute of Medical Genetics of Alsace, University of Strasbourg, Strasbourg Medical School, 67000 Strasbourg, France.,Centre de Référence pour les affections rares en génétique ophtalmologique, CARGO, Filière SENSGENE, Hôpitaux Universitaires de Strasbourg, 67091 Strasbourg, France
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Oud MM, Lamers IJC, Arts HH. Ciliopathies: Genetics in Pediatric Medicine. J Pediatr Genet 2016; 6:18-29. [PMID: 28180024 DOI: 10.1055/s-0036-1593841] [Citation(s) in RCA: 42] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2016] [Accepted: 02/08/2016] [Indexed: 12/15/2022]
Abstract
Ciliary disorders, which are also referred to as ciliopathies, are a group of hereditary disorders that result from dysfunctional cilia. The latter are cellular organelles that stick up from the apical plasma membrane. Cilia have important roles in signal transduction and facilitate communications between cells and their surroundings. Ciliary disruption can result in a wide variety of clinically and genetically heterogeneous disorders with overlapping phenotypes. Because cilia occur widespread in our bodies many organs and sensory systems can be affected when they are dysfunctional. Ciliary disorders may be isolated or syndromic, and common features are cystic liver and/or kidney disease, blindness, neural tube defects, brain anomalies and intellectual disability, skeletal abnormalities ranging from polydactyly to abnormally short ribs and limbs, ectodermal defects, obesity, situs inversus, infertility, and recurrent respiratory tract infections. In this review, we summarize the features, frequency, morbidity, and mortality of each of the different ciliopathies that occur in pediatrics. The importance of genetics and the occurrence of genotype-phenotype correlations are indicated, and advances in gene identification are discussed. The use of next-generation sequencing by which a gene panel or all genes can be screened in a single experiment is highlighted as this technology significantly lowered costs and time of the mutation detection process in the past. We discuss the challenges of this new technology and briefly touch upon the use of whole-exome sequencing as a diagnostic test for ciliary disorders. Finally, a perspective on the future of genetics in the context of ciliary disorders is provided.
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Affiliation(s)
- Machteld M Oud
- Department of Human Genetics, Radboud Institute for Molecular Life Sciences, Radboud University Medical Center, Nijmegen, The Netherlands
| | - Ideke J C Lamers
- Department of Human Genetics, Radboud Institute for Molecular Life Sciences, Radboud University Medical Center, Nijmegen, The Netherlands
| | - Heleen H Arts
- Department of Human Genetics, Radboud Institute for Molecular Life Sciences, Radboud University Medical Center, Nijmegen, The Netherlands; Department of Biochemistry, University of Western Ontario, London, Ontario, Canada
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Lindstrand A, Frangakis S, Carvalho C, Richardson E, McFadden K, Willer J, Pehlivan D, Liu P, Pediaditakis I, Sabo A, Lewis R, Banin E, Lupski J, Davis E, Katsanis N. Copy-Number Variation Contributes to the Mutational Load of Bardet-Biedl Syndrome. Am J Hum Genet 2016; 99:318-36. [PMID: 27486776 DOI: 10.1016/j.ajhg.2015.04.023] [Citation(s) in RCA: 97] [Impact Index Per Article: 12.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2015] [Accepted: 06/13/2016] [Indexed: 12/15/2022] Open
Abstract
Bardet-Biedl syndrome (BBS) is a defining ciliopathy, notable for extensive allelic and genetic heterogeneity, almost all of which has been identified through sequencing. Recent data have suggested that copy-number variants (CNVs) also contribute to BBS. We used a custom oligonucleotide array comparative genomic hybridization (aCGH) covering 20 genes that encode intraflagellar transport (IFT) components and 74 ciliopathy loci to screen 92 unrelated individuals with BBS, irrespective of their known mutational burden. We identified 17 individuals with exon-disruptive CNVs (18.5%), including 13 different deletions in eight BBS genes (BBS1, BBS2, ARL6/BBS3, BBS4, BBS5, BBS7, BBS9, and NPHP1) and a deletion and a duplication in other ciliopathy-associated genes (ALMS1 and NPHP4, respectively). By contrast, we found a single heterozygous exon-disruptive event in a BBS-associated gene (BBS9) in 229 control subjects. Superimposing these data with resequencing revealed CNVs to (1) be sufficient to cause disease, (2) Mendelize heterozygous deleterious alleles, and (3) contribute oligogenic alleles by combining point mutations and exonic CNVs in multiple genes. Finally, we report a deletion and a splice site mutation in IFT74, inherited under a recessive paradigm, defining a candidate BBS locus. Our data suggest that CNVs contribute pathogenic alleles to a substantial fraction of BBS-affected individuals and highlight how either deletions or point mutations in discrete splice isoforms can induce hypomorphic mutations in genes otherwise intolerant to deleterious variation. Our data also suggest that CNV analyses and resequencing studies unbiased for previous mutational burden is necessary to delineate the complexity of disease architecture.
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Mallaret M, Renaud M, Redin C, Drouot N, Muller J, Severac F, Mandel JL, Hamza W, Benhassine T, Ali-Pacha L, Tazir M, Durr A, Monin ML, Mignot C, Charles P, Van Maldergem L, Chamard L, Thauvin-Robinet C, Laugel V, Burglen L, Calvas P, Fleury MC, Tranchant C, Anheim M, Koenig M. Validation of a clinical practice-based algorithm for the diagnosis of autosomal recessive cerebellar ataxias based on NGS identified cases. J Neurol 2016; 263:1314-22. [DOI: 10.1007/s00415-016-8112-5] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2015] [Revised: 02/26/2016] [Accepted: 03/31/2016] [Indexed: 12/20/2022]
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Abstract
Bardet-Biedl syndrome (BBS) is a rare autosomal recessive genetic disorder. It is characterized by heterogeneous clinical manifestations including primary features of the disease (rod-cone dystrophy, polydactyly, obesity, genital abnormalities, renal defects, and learning difficulties) and secondary BBS characteristics (developmental delay, speech deficit, brachydactyly or syndactyly, dental defects, ataxia or poor coordination, olfactory deficit, diabetes mellitus, congenital heart disease, etc.); most of these symptoms may not be present at birth but appear and progressively worsen during the first and second decades of life. At least 20 BBS genes have already been identified, and all of them are involved in primary cilia functioning. Genetic diagnosis of BBS is complicated due to lack of gene-specific disease symptoms; however, it is gradually becoming more accessible with the invention of multigene sequencing technologies. Clinical management of BBS is largely limited to a symptomatic treatment. Mouse experiments demonstrate that the most debilitating complication of BBS, blindness, can be rescued by topical gene therapy. There is a published case report describing the delay of BBS symptoms by nutritional compensation of the disease-related biochemical deficiencies. Progress in DNA testing technologies is likely to rapidly resolve all limitations in BBS diagnosis; however, much slower improvement is expected with regard to BBS treatment.
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Affiliation(s)
- Evgeny N Suspitsin
- N.N. Petrov Institute of Oncology, St. Petersburg, Russia; St. Petersburg Pediatric Medical University, St. Petersburg, Russia
| | - Evgeny N Imyanitov
- N.N. Petrov Institute of Oncology, St. Petersburg, Russia; St. Petersburg Pediatric Medical University, St. Petersburg, Russia; I.I. Mechnikov North-Western Medical University, St. Petersburg, Russia; St. Petersburg State University, St. Petersburg, Russia
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Khan S, Muhammad N, Khan M, Kamal A, Rehman Z, Khan S. Genetics of human Bardet-Biedl syndrome, an updates. Clin Genet 2016; 90:3-15. [DOI: 10.1111/cge.12737] [Citation(s) in RCA: 98] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2015] [Revised: 12/21/2015] [Accepted: 01/03/2016] [Indexed: 12/22/2022]
Affiliation(s)
- S.A. Khan
- Department of Biotechnology and Genetic Engineering; Kohat University of Science and Technology; Khyber Pakhtunkhwa Pakistan
| | - N. Muhammad
- Department of Biotechnology and Genetic Engineering; Kohat University of Science and Technology; Khyber Pakhtunkhwa Pakistan
| | - M.A. Khan
- Gomal Centre of Biochemistry and Biotechnology; Gomal University; Khyber Pakhtunkhwa Pakistan
- Genomic Core Facility; Interim Translational Research Institute; Doha Qatar
| | - A. Kamal
- Department of Biotechnology and Genetic Engineering; Kohat University of Science and Technology; Khyber Pakhtunkhwa Pakistan
| | - Z.U. Rehman
- Department of Biotechnology and Genetic Engineering; Kohat University of Science and Technology; Khyber Pakhtunkhwa Pakistan
| | - S. Khan
- Department of Biotechnology and Genetic Engineering; Kohat University of Science and Technology; Khyber Pakhtunkhwa Pakistan
- Genomic Core Facility; Interim Translational Research Institute; Doha Qatar
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Khan MA, Mohan S, Zubair M, Windpassinger C. Homozygosity mapping identified a novel protein truncating mutation (p.Ser100Leufs*24) of the BBS9 gene in a consanguineous Pakistani family with Bardet Biedl syndrome. BMC MEDICAL GENETICS 2016; 17:10. [PMID: 26846096 PMCID: PMC4743198 DOI: 10.1186/s12881-016-0271-9] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/31/2015] [Accepted: 01/19/2016] [Indexed: 12/16/2022]
Abstract
BACKGROUND Bardet Biedl Syndrome (BBS) is a rare condition of multi-organ dysfunction with characteristic clinical features of retinal degeneration, truncal obesity, postaxial polydactyly, genital anomaly, intellectual disability and renal dysfunction. It is a hetero-genetic disorder and nineteen BBS genes have been discovered so far. METHODS Whole genome SNP genotyping was performed by using CytoScan® 750 K array (Affymetrix). Subsequently, the segregation of the disease locus in the whole family was carried out by genotyping STS markers within the homozygous interval. Finally, the mutation analysis was performed by Sanger DNA sequencing. RESULTS In the present molecular study a consanguineous Pakistani family, with autosomal recessive BBS, was analyzed. The clinical analysis of affected individuals presented with synpolydactyly, obesity, intellectual disability, renal abnormality and retinitis pigmentosa. The presented phenotype was consistent with the major features of BBS syndrome. Homozygosity mapping identified a common homozygous interval within the known BBS9 locus. Sequence analysis of BBS9/PTHB1 gene revealed a single base deletion of c.299delC (p.Ser100Leufs*24) in exon 4. This frame-shift mutation presumably leads to a 122 amino acid truncated protein with complete loss of its C-terminal PTHB1 domain in combination with a partial loss of the N-terminal PTHB1 domain as well. BBS9/PTHB1 gene mutations have been shown to be associated with BBS syndrome and to the best of our knowledge this study reports the first Pakistani family linked to the BBS9 gene. CONCLUSION Our molecular findings expand the mutational spectrum of BBS9 gene and also explain the genetic heterogeneity of Pakistan families with BBS syndrome. The growing number of mutations in BBS genes in combination with a detailed phenotypical description of patients will be helpful for genotype-phenotype correlation, targeted genetic diagnosis, prenatal screening and carrier testing of familial and non-familial BBS patients.
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Affiliation(s)
- Muzammil Ahmad Khan
- Gomal Centre of Biochemistry and Biotechnology, Gomal University Dera Ismail Khan, Khyber-Pakhtoonkhwa, Khyber-Pakhtoonkhwa, 29050, Pakistan.
- Interim Translational Research Institute, Genomic Core Facility, Academic Health System, Hamad Medical Corporation, Doha, 3050, Qatar.
| | - Sumitra Mohan
- Institute of Human Genetics, Medical University of Graz, Graz, 8010, Austria.
| | - Muhammad Zubair
- Gomal Centre of Biochemistry and Biotechnology, Gomal University Dera Ismail Khan, Khyber-Pakhtoonkhwa, Khyber-Pakhtoonkhwa, 29050, Pakistan.
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Prasad MK, Geoffroy V, Vicaire S, Jost B, Dumas M, Le Gras S, Switala M, Gasse B, Laugel-Haushalter V, Paschaki M, Leheup B, Droz D, Dalstein A, Loing A, Grollemund B, Muller-Bolla M, Lopez-Cazaux S, Minoux M, Jung S, Obry F, Vogt V, Davideau JL, Davit-Beal T, Kaiser AS, Moog U, Richard B, Morrier JJ, Duprez JP, Odent S, Bailleul-Forestier I, Rousset MM, Merametdijan L, Toutain A, Joseph C, Giuliano F, Dahlet JC, Courval A, El Alloussi M, Laouina S, Soskin S, Guffon N, Dieux A, Doray B, Feierabend S, Ginglinger E, Fournier B, de la Dure Molla M, Alembik Y, Tardieu C, Clauss F, Berdal A, Stoetzel C, Manière MC, Dollfus H, Bloch-Zupan A. A targeted next-generation sequencing assay for the molecular diagnosis of genetic disorders with orodental involvement. J Med Genet 2016; 53:98-110. [PMID: 26502894 PMCID: PMC4752661 DOI: 10.1136/jmedgenet-2015-103302] [Citation(s) in RCA: 88] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2015] [Revised: 09/08/2015] [Accepted: 09/24/2015] [Indexed: 11/23/2022]
Abstract
BACKGROUND Orodental diseases include several clinically and genetically heterogeneous disorders that can present in isolation or as part of a genetic syndrome. Due to the vast number of genes implicated in these disorders, establishing a molecular diagnosis can be challenging. We aimed to develop a targeted next-generation sequencing (NGS) assay to diagnose mutations and potentially identify novel genes mutated in this group of disorders. METHODS We designed an NGS gene panel that targets 585 known and candidate genes in orodental disease. We screened a cohort of 101 unrelated patients without a molecular diagnosis referred to the Reference Centre for Oro-Dental Manifestations of Rare Diseases, Strasbourg, France, for a variety of orodental disorders including isolated and syndromic amelogenesis imperfecta (AI), isolated and syndromic selective tooth agenesis (STHAG), isolated and syndromic dentinogenesis imperfecta, isolated dentin dysplasia, otodental dysplasia and primary failure of tooth eruption. RESULTS We discovered 21 novel pathogenic variants and identified the causative mutation in 39 unrelated patients in known genes (overall diagnostic rate: 39%). Among the largest subcohorts of patients with isolated AI (50 unrelated patients) and isolated STHAG (21 unrelated patients), we had a definitive diagnosis in 14 (27%) and 15 cases (71%), respectively. Surprisingly, COL17A1 mutations accounted for the majority of autosomal-dominant AI cases. CONCLUSIONS We have developed a novel targeted NGS assay for the efficient molecular diagnosis of a wide variety of orodental diseases. Furthermore, our panel will contribute to better understanding the contribution of these genes to orodental disease. TRIAL REGISTRATION NUMBERS NCT01746121 and NCT02397824.
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Affiliation(s)
- Megana K Prasad
- Laboratoire de Génétique Médicale, INSERMU1112, Institut de génétique médicale d'Alsace, FMTS, Université de Strasbourg, Strasbourg, France
| | - Véronique Geoffroy
- Laboratoire de Génétique Médicale, INSERMU1112, Institut de génétique médicale d'Alsace, FMTS, Université de Strasbourg, Strasbourg, France
| | - Serge Vicaire
- Plateforme de Biopuces et Séquençage, Institut de Génétique et de Biologie Moléculaire and Cellulaire-Centre Européen de Recherche en Biologie et en Médecine, CNRS UMR7104, INSERM U964, Université de Strasbourg, Illkirch, France
| | - Bernard Jost
- Plateforme de Biopuces et Séquençage, Institut de Génétique et de Biologie Moléculaire and Cellulaire-Centre Européen de Recherche en Biologie et en Médecine, CNRS UMR7104, INSERM U964, Université de Strasbourg, Illkirch, France
| | - Michael Dumas
- Plateforme de Biopuces et Séquençage, Institut de Génétique et de Biologie Moléculaire and Cellulaire-Centre Européen de Recherche en Biologie et en Médecine, CNRS UMR7104, INSERM U964, Université de Strasbourg, Illkirch, France
| | - Stéphanie Le Gras
- Plateforme de Biopuces et Séquençage, Institut de Génétique et de Biologie Moléculaire and Cellulaire-Centre Européen de Recherche en Biologie et en Médecine, CNRS UMR7104, INSERM U964, Université de Strasbourg, Illkirch, France
| | - Marzena Switala
- Centre de Référence des Manifestations Odontologiques des Maladies Rares, Pôle de Médecine et Chirurgie Bucco-dentaires, Hôpitaux Universitaires de Strasbourg (HUS), Strasbourg, France
- Faculté de Chirurgie Dentaire, Université de Strasbourg, Strasbourg, France
| | - Barbara Gasse
- Evolution et Développement du Squelette-EDS, UMR7138-SAE, Université Pierre et Marie Curie, Paris, France
| | - Virginie Laugel-Haushalter
- Institut de Génétique et de Biologie Moléculaire and Cellulaire-Centre Européen de Recherche en Biologie et en Médecine, CNRS UMR7104, INSERM U964 Université de Strasbourg, Illkirch, France
| | - Marie Paschaki
- Laboratoire de Génétique Médicale, INSERMU1112, Institut de génétique médicale d'Alsace, FMTS, Université de Strasbourg, Strasbourg, France
- Institut de Génétique et de Biologie Moléculaire and Cellulaire-Centre Européen de Recherche en Biologie et en Médecine, CNRS UMR7104, INSERM U964 Université de Strasbourg, Illkirch, France
| | - Bruno Leheup
- Faculté de Médecine, CHU de Nancy, Université de Lorraine, Vandoeuvre-Les-Nancy, France
| | | | | | - Adeline Loing
- Centre de Référence des Manifestations Odontologiques des Maladies Rares, Pôle de Médecine et Chirurgie Bucco-dentaires, Hôpitaux Universitaires de Strasbourg (HUS), Strasbourg, France
| | - Bruno Grollemund
- Faculté de Chirurgie Dentaire, Université de Strasbourg, Strasbourg, France
| | - Michèle Muller-Bolla
- Départment d'Odontologie Pédiatrique, UFR d'Odontologie, Université de Nice Sophia-Antipolis, CHU de Nice, Nice, France
- URB2i—EA 4462, Paris Descartes, Paris, France
| | - Séréna Lopez-Cazaux
- Faculté de Chirurgie Dentaire, Département d'Odontologie Pédiatrique, CHU Hotel Dieu, Service d'odontologie conservatrice et pédiatrique, Nantes, France
| | - Maryline Minoux
- Centre de Référence des Manifestations Odontologiques des Maladies Rares, Pôle de Médecine et Chirurgie Bucco-dentaires, Hôpitaux Universitaires de Strasbourg (HUS), Strasbourg, France
- Faculté de Chirurgie Dentaire, Université de Strasbourg, Strasbourg, France
| | - Sophie Jung
- Centre de Référence des Manifestations Odontologiques des Maladies Rares, Pôle de Médecine et Chirurgie Bucco-dentaires, Hôpitaux Universitaires de Strasbourg (HUS), Strasbourg, France
- Faculté de Chirurgie Dentaire, Université de Strasbourg, Strasbourg, France
| | - Frédéric Obry
- Centre de Référence des Manifestations Odontologiques des Maladies Rares, Pôle de Médecine et Chirurgie Bucco-dentaires, Hôpitaux Universitaires de Strasbourg (HUS), Strasbourg, France
- Faculté de Chirurgie Dentaire, Université de Strasbourg, Strasbourg, France
| | - Vincent Vogt
- Centre de Référence des Manifestations Odontologiques des Maladies Rares, Pôle de Médecine et Chirurgie Bucco-dentaires, Hôpitaux Universitaires de Strasbourg (HUS), Strasbourg, France
- Faculté de Chirurgie Dentaire, Université de Strasbourg, Strasbourg, France
| | - Jean-Luc Davideau
- Faculté de Chirurgie Dentaire, Université de Strasbourg, Strasbourg, France
| | - Tiphaine Davit-Beal
- Evolution et Développement du Squelette-EDS, UMR7138-SAE, Université Pierre et Marie Curie, Paris, France
- Faculté de Chirurgie Dentaire, Département d'Odontologie Pédiatrique, Université Paris Descartes, Montrouge, France
| | | | - Ute Moog
- Institute of Human Genetics, Heidelberg University, Heidelberg, Germany
| | - Béatrice Richard
- Service de Consultations et Traitements Dentaires, Hospices Civils de Lyon, Faculté d'Odontologie, Université Claude Bernard Lyon1, Lyon, France
| | - Jean-Jacques Morrier
- Service de Consultations et Traitements Dentaires, Hospices Civils de Lyon, Faculté d'Odontologie, Université Claude Bernard Lyon1, Lyon, France
| | - Jean-Pierre Duprez
- Service de Consultations et Traitements Dentaires, Hospices Civils de Lyon, Faculté d'Odontologie, Université Claude Bernard Lyon1, Lyon, France
| | - Sylvie Odent
- Service de Génétique Clinique, CHU de Rennes, Rennes, France
| | - Isabelle Bailleul-Forestier
- Faculté de Chirurgie Dentaire, CHU de Toulouse, Odontologie Pédiatrique, Université Paul Sabatier, Toulouse, France
| | - Monique Marie Rousset
- Unité Fonctionnelle d'Odontologie pédiatrique, Service d'odontologie, CHRU de Lille, Lille, France
| | - Laure Merametdijan
- Faculté de Chirurgie Dentaire, Service d'Odontologie Conservatrice et Endodontie, CHU Nantes, Université de Nantes, France
| | | | - Clara Joseph
- Départment d'Odontologie Pédiatrique, Université de Nice Sophia-Antipolis, CHU Nice, Nice, France
| | | | - Jean-Christophe Dahlet
- Centre de Référence des Manifestations Odontologiques des Maladies Rares, Pôle de Médecine et Chirurgie Bucco-dentaires, Hôpitaux Universitaires de Strasbourg (HUS), Strasbourg, France
| | - Aymeric Courval
- Pôle de Médecine et de Chirurgie Bucco-dentaire, Hôpital Civil, HUS, Strasbourg, France
| | - Mustapha El Alloussi
- Faculty of Dental Medicine, Department of Pediatric Dentistry, University Mohammed V Rabat, Morocco
| | - Samir Laouina
- Faculty of Dental Medicine, Department of Pediatric Dentistry, University Mohammed V Rabat, Morocco
| | - Sylvie Soskin
- Pédiatrie 1, Hôpitaux Universitaires de Strasbourg, Strasbourg, France
| | | | - Anne Dieux
- Service de génétique clinique Guy Fontaine, Centre Hospitalier Régionale Universitaire (CHRU) de Lille, Lille, France
| | - Bérénice Doray
- Service de Génétique Médicale, CHU de Strasbourg, Strasbourg, France
| | - Stephanie Feierabend
- Klinik für Zahnerhaltungskunde und Parodontologie, Universitats Klinikum, Freiburg, Germany
| | | | - Benjamin Fournier
- Laboratoire de Physiopathologie Orale Moléculaire INSERM UMR S1138, Centre de Recherche des Cordeliers, Universités Paris-Diderot et Paris-Descartes, Paris, France
- Centre de Référence des Malformations Rares de la Face et de la Cavité Buccale MAFACE, Hôpital Rothschild, Pôle d'Odontologie, Paris, France
| | - Muriel de la Dure Molla
- Laboratoire de Physiopathologie Orale Moléculaire INSERM UMR S1138, Centre de Recherche des Cordeliers, Universités Paris-Diderot et Paris-Descartes, Paris, France
- Centre de Référence des Malformations Rares de la Face et de la Cavité Buccale MAFACE, Hôpital Rothschild, Pôle d'Odontologie, Paris, France
| | - Yves Alembik
- Service de Génétique Médicale, CHU de Strasbourg, Strasbourg, France
| | - Corinne Tardieu
- Aix-Marseille Université, UMR 7268 ADES/EFS/CNRS, APHM, Hôpital Timone, Service Odontologie, Marseille, France
| | - François Clauss
- Centre de Référence des Manifestations Odontologiques des Maladies Rares, Pôle de Médecine et Chirurgie Bucco-dentaires, Hôpitaux Universitaires de Strasbourg (HUS), Strasbourg, France
- Faculté de Chirurgie Dentaire, Université de Strasbourg, Strasbourg, France
| | - Ariane Berdal
- Laboratoire de Physiopathologie Orale Moléculaire INSERM UMR S1138, Centre de Recherche des Cordeliers, Universités Paris-Diderot et Paris-Descartes, Paris, France
- Centre de Référence des Malformations Rares de la Face et de la Cavité Buccale MAFACE, Hôpital Rothschild, Pôle d'Odontologie, Paris, France
| | - Corinne Stoetzel
- Laboratoire de Génétique Médicale, INSERMU1112, Institut de génétique médicale d'Alsace, FMTS, Université de Strasbourg, Strasbourg, France
| | - Marie Cécile Manière
- Centre de Référence des Manifestations Odontologiques des Maladies Rares, Pôle de Médecine et Chirurgie Bucco-dentaires, Hôpitaux Universitaires de Strasbourg (HUS), Strasbourg, France
- Faculté de Chirurgie Dentaire, Université de Strasbourg, Strasbourg, France
| | - Hélène Dollfus
- Laboratoire de Génétique Médicale, INSERMU1112, Institut de génétique médicale d'Alsace, FMTS, Université de Strasbourg, Strasbourg, France
- Service de Génétique Médicale, Centre de Référence pour les Affections Rares en Génétique Ophtalmologique, HUS, Strasbourg, France
| | - Agnès Bloch-Zupan
- Centre de Référence des Manifestations Odontologiques des Maladies Rares, Pôle de Médecine et Chirurgie Bucco-dentaires, Hôpitaux Universitaires de Strasbourg (HUS), Strasbourg, France
- Faculté de Chirurgie Dentaire, Université de Strasbourg, Strasbourg, France
- Institut de Génétique et de Biologie Moléculaire and Cellulaire-Centre Européen de Recherche en Biologie et en Médecine, CNRS UMR7104, INSERM U964 Université de Strasbourg, Illkirch, France
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Guissart C, Drouot N, Oncel I, Leheup B, Gershoni-Barush R, Muller J, Ferdinandusse S, Larrieu L, Anheim M, Arslan EA, Claustres M, Tranchant C, Topaloglu H, Koenig M. Genes for spinocerebellar ataxia with blindness and deafness (SCABD/SCAR3, MIM# 271250 and SCABD2). Eur J Hum Genet 2015; 24:1154-9. [PMID: 26669662 DOI: 10.1038/ejhg.2015.259] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2015] [Revised: 11/10/2015] [Accepted: 11/18/2015] [Indexed: 12/13/2022] Open
Abstract
Ataxia is a symptom that is often associated with syndromic inherited diseases. We previously reported the linkage of a novel syndrome, ataxia with blindness and deafness (SCAR3/SCABD, OMIM# 271250), to chromosome 6p21-p23 by linkage mapping of an Arab Israeli consanguineous family. We have now identified by whole-exome sequencing a homozygous missense mutation in the Arab Israeli family in the SLC52A2 gene located in 8qter, therefore excluding linkage of this family to 6p. We confirmed the involvement of SLC52A2 by the identification of a second mutation in an independent family with an identical syndromic presentation, which we suggest to name SCABD2. SCABD2 is therefore allelic to Brown-Vialleto-Van Laere syndrome type 2 defined by prominent motoneuronopathy and deafness, and also caused by SLC52A2 mutations. In the course of this project, we identified a clinically similar family with a homozygous missense mutation in PEX6, which is located in 6p21. Therefore, despite false linkage in the initial family, SCABD1/SCAR3 is located in 6p21 and is caused by PEX6 mutations. Both SLC52A2 and PEX6 should be included in screening panels for the diagnosis of syndromic inherited ataxias, particularly as patients with mutations in SLC52A2 can be ameliorated by riboflavin supplementation.
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Affiliation(s)
- Claire Guissart
- Equipe d'Accueil 7402, Institut Universitaire de Recherche Clinique, Université de Montpellier, Montpellier, France.,Laboratoire de Génétique Moléculaire, CHU de Montpellier, Montpellier, France
| | - Nathalie Drouot
- Institut de Génétique et de Biologie Moléculaire et Cellulaire (IGBMC), INSERM-U964/CNRS-UMR7104/Université de Strasbourg, Illkirch, France
| | - Ibrahim Oncel
- Department of Pediatrics, Hacettepe University, Ankara, Turkey
| | - Bruno Leheup
- CHU de Nancy Pôle Enfants Service de Médecine Infantile et Génétique Clinique, Centre de Référence Syndrome Malformatif et Anomalies du Développement, Vandoeuvre, France.,Université de Lorraine Faculté de Médecine, Vandoeuvre, France
| | | | - Jean Muller
- Laboratoire de Diagnostic Génétique, Hôpitaux Universitaires de Strasbourg, Strasbourg, France.,Laboratoire de Génétique médicale, UMR_S INSERM U1112, IGMA, Faculté de Médecine FMTS, Université de Strasbourg, Strasbourg, France
| | - Sacha Ferdinandusse
- Laboratory Genetic Metabolic Diseases, Academic Medical Center, Amsterdam, The Netherlands
| | - Lise Larrieu
- Laboratoire de Génétique Moléculaire, CHU de Montpellier, Montpellier, France
| | - Mathieu Anheim
- Institut de Génétique et de Biologie Moléculaire et Cellulaire (IGBMC), INSERM-U964/CNRS-UMR7104/Université de Strasbourg, Illkirch, France.,CHU de Strasbourg-Hôpital de Hautepierre, Strasbourg, France
| | | | - Mireille Claustres
- Equipe d'Accueil 7402, Institut Universitaire de Recherche Clinique, Université de Montpellier, Montpellier, France.,Laboratoire de Génétique Moléculaire, CHU de Montpellier, Montpellier, France
| | - Christine Tranchant
- Institut de Génétique et de Biologie Moléculaire et Cellulaire (IGBMC), INSERM-U964/CNRS-UMR7104/Université de Strasbourg, Illkirch, France.,CHU de Strasbourg-Hôpital de Hautepierre, Strasbourg, France
| | - Haluk Topaloglu
- Department of Pediatrics, Hacettepe University, Ankara, Turkey
| | - Michel Koenig
- Equipe d'Accueil 7402, Institut Universitaire de Recherche Clinique, Université de Montpellier, Montpellier, France.,Laboratoire de Génétique Moléculaire, CHU de Montpellier, Montpellier, France
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49
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Ece Solmaz A, Onay H, Atik T, Aykut A, Cerrah Gunes M, Ozalp Yuregir O, Bas VN, Hazan F, Kirbiyik O, Ozkinay F. Targeted multi-gene panel testing for the diagnosis of Bardet Biedl syndrome: Identification of nine novel mutations across BBS1, BBS2, BBS4, BBS7, BBS9, BBS10 genes. Eur J Med Genet 2015; 58:689-94. [DOI: 10.1016/j.ejmg.2015.10.011] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2015] [Revised: 10/19/2015] [Accepted: 10/23/2015] [Indexed: 12/19/2022]
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50
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Bronicki LM, Redin C, Drunat S, Piton A, Lyons M, Passemard S, Baumann C, Faivre L, Thevenon J, Rivière JB, Isidor B, Gan G, Francannet C, Willems M, Gunel M, Jones JR, Gleeson JG, Mandel JL, Stevenson RE, Friez MJ, Aylsworth AS. Ten new cases further delineate the syndromic intellectual disability phenotype caused by mutations in DYRK1A. Eur J Hum Genet 2015; 23:1482-7. [PMID: 25920557 PMCID: PMC4613470 DOI: 10.1038/ejhg.2015.29] [Citation(s) in RCA: 52] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2014] [Revised: 12/18/2014] [Accepted: 01/28/2015] [Indexed: 01/12/2023] Open
Abstract
The dual-specificity tyrosine-phosphorylation-regulated kinase 1A (DYRK1A) gene, located on chromosome 21q22.13 within the Down syndrome critical region, has been implicated in syndromic intellectual disability associated with Down syndrome and autism. DYRK1A has a critical role in brain growth and development primarily by regulating cell proliferation, neurogenesis, neuronal plasticity and survival. Several patients have been reported with chromosome 21 aberrations such as partial monosomy, involving multiple genes including DYRK1A. In addition, seven other individuals have been described with chromosomal rearrangements, intragenic deletions or truncating mutations that disrupt specifically DYRK1A. Most of these patients have microcephaly and all have significant intellectual disability. In the present study, we report 10 unrelated individuals with DYRK1A-associated intellectual disability (ID) who display a recurrent pattern of clinical manifestations including primary or acquired microcephaly, ID ranging from mild to severe, speech delay or absence, seizures, autism, motor delay, deep-set eyes, poor feeding and poor weight gain. We identified unique truncating and non-synonymous mutations (three nonsense, four frameshift and two missense) in DYRK1A in nine patients and a large chromosomal deletion that encompassed DYRK1A in one patient. On the basis of increasing identification of mutations in DYRK1A, we suggest that this gene be considered potentially causative in patients presenting with ID, primary or acquired microcephaly, feeding problems and absent or delayed speech with or without seizures.
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Affiliation(s)
| | - Claire Redin
- Department of Translational Medicine and Neurogenetics, IGBMC, CNRS UMR 7104, INSERM U964, Strasbourg University, Strasbourg, France
| | - Severine Drunat
- Department of Genetics and INSERM U1141, Robert Debré Hospital, Paris, France
| | - Amélie Piton
- Department of Translational Medicine and Neurogenetics, IGBMC, CNRS UMR 7104, INSERM U964, Strasbourg University, Strasbourg, France
- Laboratoire de diagnostic génétique, Faculty of Medicine and CHU Strasbourg, Strasbourg, France
| | | | - Sandrine Passemard
- Department of Genetics and INSERM U1141, Robert Debré Hospital, Paris, France
| | | | - Laurence Faivre
- Fédération Hospitalo- Universitaire Médecine Translationnelle et Anomalies du Développement (TRANSLAD), Centre Hospitalier Universitaire Dijon, Dijon, France
- Centre de Génétique et Centre de Référence Anomalies du Développement et Syndromes Malformatifs de l'Interrégion Est, Centre Hospitalier Universitaire Dijon, Dijon, France
- Equipe d'Accueil 4271, Génétique des Anomalies du Développement, Université de Bourgogne, Dijon, France
| | - Julien Thevenon
- Fédération Hospitalo- Universitaire Médecine Translationnelle et Anomalies du Développement (TRANSLAD), Centre Hospitalier Universitaire Dijon, Dijon, France
- Centre de Génétique et Centre de Référence Anomalies du Développement et Syndromes Malformatifs de l'Interrégion Est, Centre Hospitalier Universitaire Dijon, Dijon, France
- Equipe d'Accueil 4271, Génétique des Anomalies du Développement, Université de Bourgogne, Dijon, France
| | - Jean-Baptiste Rivière
- Fédération Hospitalo- Universitaire Médecine Translationnelle et Anomalies du Développement (TRANSLAD), Centre Hospitalier Universitaire Dijon, Dijon, France
- Equipe d'Accueil 4271, Génétique des Anomalies du Développement, Université de Bourgogne, Dijon, France
- Laboratoire de Génétique Moléculaire, Plateau Technique de Biologie, Centre Hospitalier Universitaire Dijon, Dijon, France
| | - Bertrand Isidor
- Medical Genetics- Clinical Genetics Unit, CHU de Nantes, Nantes-Cedex, France
| | - Grace Gan
- Department of Translational Medicine and Neurogenetics, IGBMC, CNRS UMR 7104, INSERM U964, Strasbourg University, Strasbourg, France
| | - Christine Francannet
- Service de génétique médicale, CHU de Clermont-Ferrand, Clermont-Ferrand, France
| | - Marjolaine Willems
- Department of Medical Genetics, Reference Center for Rare Diseases, Developmental Disorders and Multiple Congenital Anomalies, Arnaud de Villeneuve Hospital, Montpellier, France
| | - Murat Gunel
- Department of Genetics and Neurosurgery, Yale University School of Medicine, New Haven, CT, USA
| | | | - Joseph G Gleeson
- Department of Neurosciences, Howard Hughes Medical Institute, Rady Children's Hospital, University of California, San Diego, La Jolla, CA, USA
| | - Jean-Louis Mandel
- Department of Translational Medicine and Neurogenetics, IGBMC, CNRS UMR 7104, INSERM U964, Strasbourg University, Strasbourg, France
- Laboratoire de diagnostic génétique, Faculty of Medicine and CHU Strasbourg, Strasbourg, France
| | | | | | - Arthur S Aylsworth
- Departments of Pediatrics and Genetics, Division of Genetics and Metabolism, University of North Carolina, Chapel Hill, NC, USA
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