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Singh S, Penney C, Griffin A, Woodland G, Werdyani S, Benteau TA, Abdelfatah N, Squires J, King B, Houston J, Dyer MJ, Roslin NM, Vincent D, Marquis P, O'Rielly DD, Hodgkinson K, Burt T, Baker A, Stanton SG, Young TL. Highly variable hearing loss due to POU4F3 (c.37del) is revealed by longitudinal, frequency specific analyses. Eur J Hum Genet 2023:10.1038/s41431-023-01358-0. [PMID: 37072551 DOI: 10.1038/s41431-023-01358-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2022] [Revised: 03/21/2023] [Accepted: 03/28/2023] [Indexed: 04/20/2023] Open
Abstract
Genotype-phenotype correlations add value to the management of families with hereditary hearing loss (HL), where age-related typical audiograms (ARTAs) are generated from cross-sectional regression equations and used to predict the audiogram phenotype across the lifespan. A seven-generation kindred with autosomal dominant sensorineural HL (ADSNHL) was recruited and a novel pathogenic variant in POU4F3 (c.37del) was identified by combining linkage analysis with whole exome sequencing (WES). POU4F3 is noted for large intrafamilial variation including the age of onset of HL, audiogram configuration and presence of vestibular impairment. Sequential audiograms and longitudinal analyses reveal highly variable audiogram features among POU4F3 (c.37del) carriers, limiting the utility of ARTAs for clinical prognosis and management of HL. Furthermore, a comparison of ARTAs against three previously published families (1 Israeli Jewish, 2 Dutch) reveals significant interfamilial differences, with earlier onset and slower deterioration. This is the first published report of a North American family with ADSNHL due to POU4F3, the first report of the pathogenic c.37del variant, and the first study to conduct longitudinal analysis, extending the phenotypic spectrum of DFNA15.
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Affiliation(s)
- Sushma Singh
- Communication Sciences and Disorders and National Centre for Audiology, Western University, Elborn College, 1201 Western Road, London, ON, Canada
| | - Cindy Penney
- Centre for Translational Genomics, Health Sciences Centre, 300 Prince Philip Drive, St. John's, NL, Canada
- Faculty of Medicine, Health Sciences Centre, Memorial University, 300 Prince Philip Drive, St. John's, NL, Canada
| | - Anne Griffin
- Faculty of Medicine, Health Sciences Centre, Memorial University, 300 Prince Philip Drive, St. John's, NL, Canada
| | - Geoffrey Woodland
- Centre for Translational Genomics, Health Sciences Centre, 300 Prince Philip Drive, St. John's, NL, Canada
| | - Salem Werdyani
- Faculty of Medicine, Health Sciences Centre, Memorial University, 300 Prince Philip Drive, St. John's, NL, Canada
| | - Tammy A Benteau
- Faculty of Medicine, Health Sciences Centre, Memorial University, 300 Prince Philip Drive, St. John's, NL, Canada
| | - Nelly Abdelfatah
- Faculty of Medicine, Health Sciences Centre, Memorial University, 300 Prince Philip Drive, St. John's, NL, Canada
| | - Jessica Squires
- Faculty of Medicine, Health Sciences Centre, Memorial University, 300 Prince Philip Drive, St. John's, NL, Canada
| | | | - Jim Houston
- Faculty of Medicine, Health Sciences Centre, Memorial University, 300 Prince Philip Drive, St. John's, NL, Canada
| | - Matthew J Dyer
- Faculty of Medicine, Health Sciences Centre, Memorial University, 300 Prince Philip Drive, St. John's, NL, Canada
| | - Nicole M Roslin
- The Centre for Applied Genomics, The Hospital for Sick Children, Peter Gilgan Centre for Research and Learning, 686 Bay Street, Toronto, ON, Canada
| | - Daniel Vincent
- Canadian Centre for Computational Genomics, McGill University, 740 Dr. Penfield Avenue, Montréal, QC, Canada
| | - Pascale Marquis
- Canadian Centre for Computational Genomics, McGill University, 740 Dr. Penfield Avenue, Montréal, QC, Canada
| | - Darren D O'Rielly
- Centre for Translational Genomics, Health Sciences Centre, 300 Prince Philip Drive, St. John's, NL, Canada
| | - Kathy Hodgkinson
- Faculty of Medicine, Health Sciences Centre, Memorial University, 300 Prince Philip Drive, St. John's, NL, Canada
| | - Taylor Burt
- Faculty of Medicine, Health Sciences Centre, Memorial University, 300 Prince Philip Drive, St. John's, NL, Canada
| | - Ashley Baker
- Faculty of Medicine, Health Sciences Centre, Memorial University, 300 Prince Philip Drive, St. John's, NL, Canada
| | - Susan G Stanton
- Communication Sciences and Disorders and National Centre for Audiology, Western University, Elborn College, 1201 Western Road, London, ON, Canada
| | - Terry-Lynn Young
- Communication Sciences and Disorders and National Centre for Audiology, Western University, Elborn College, 1201 Western Road, London, ON, Canada.
- Centre for Translational Genomics, Health Sciences Centre, 300 Prince Philip Drive, St. John's, NL, Canada.
- Faculty of Medicine, Health Sciences Centre, Memorial University, 300 Prince Philip Drive, St. John's, NL, Canada.
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2
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Pater JA, Penney C, O'Rielly DD, Griffin A, Kamal L, Brownstein Z, Vona B, Vinkler C, Shohat M, Barel O, French CR, Singh S, Werdyani S, Burt T, Abdelfatah N, Houston J, Doucette LP, Squires J, Glaser F, Roslin NM, Vincent D, Marquis P, Woodland G, Benoukraf T, Hawkey-Noble A, Avraham KB, Stanton SG, Young TL. Autosomal dominant non-syndromic hearing loss maps to DFNA33 (13q34) and co-segregates with splice and frameshift variants in ATP11A, a phospholipid flippase gene. Hum Genet 2022; 141:431-444. [PMID: 35278131 PMCID: PMC9035003 DOI: 10.1007/s00439-022-02444-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2021] [Accepted: 02/22/2022] [Indexed: 11/20/2022]
Abstract
Sequencing exomes/genomes have been successful for identifying recessive genes; however, discovery of dominant genes including deafness genes (DFNA) remains challenging. We report a new DFNA gene, ATP11A, in a Newfoundland family with a variable form of bilateral sensorineural hearing loss (SNHL). Genome-wide SNP genotyping linked SNHL to DFNA33 (LOD = 4.77), a locus on 13q34 previously mapped in a German family with variable SNHL. Whole-genome sequencing identified 51 unremarkable positional variants on 13q34. Continuous clinical ascertainment identified several key recombination events and reduced the disease interval to 769 kb, excluding all but one variant. ATP11A (NC_000013.11: chr13:113534963G>A) is a novel variant predicted to be a cryptic donor splice site. RNA studies verified in silico predictions, revealing the retention of 153 bp of intron in the 3' UTR of several ATP11A isoforms. Two unresolved families from Israel were subsequently identified with a similar, variable form of SNHL and a novel duplication (NM_032189.3:c.3322_3327+2dupGTCCAGGT) in exon 28 of ATP11A extended exon 28 by 8 bp, leading to a frameshift and premature stop codon (p.Asn1110Valfs43Ter). ATP11A is a type of P4-ATPase that transports (flip) phospholipids from the outer to inner leaflet of cell membranes to maintain asymmetry. Haploinsufficiency of ATP11A, the phospholipid flippase that specially transports phosphatidylserine (PS) and phosphatidylethanolamine (PE), could leave cells with PS/PE at the extracellular side vulnerable to phagocytic degradation. Given that surface PS can be pharmaceutically targeted, hearing loss due to ATP11A could potentially be treated. It is also likely that ATP11A is the gene underlying DFNA33.
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Affiliation(s)
- Justin A Pater
- Faculty of Medicine, Memorial University, 300 Prince Phillip Drive, St. John's, NL, Canada
- Dana-Farber Cancer Institute, Harvard Medical School, Boston, MA, USA
| | - Cindy Penney
- Faculty of Medicine, Memorial University, 300 Prince Phillip Drive, St. John's, NL, Canada
- Centre for Translational Genomics, Memorial University, 300 Prince Phillip Dr., St. John's, NL, Canada
| | - Darren D O'Rielly
- Faculty of Medicine, Memorial University, 300 Prince Phillip Drive, St. John's, NL, Canada
- Centre for Translational Genomics, Memorial University, 300 Prince Phillip Dr., St. John's, NL, Canada
| | - Anne Griffin
- Faculty of Medicine, Memorial University, 300 Prince Phillip Drive, St. John's, NL, Canada
| | - Lara Kamal
- Department of Human Molecular Genetics and Biochemistry, Faculty of Medicine and Sagol School of Neuroscience, Tel Aviv University, 6997801, Tel Aviv, Israel
| | - Zippora Brownstein
- Department of Human Molecular Genetics and Biochemistry, Faculty of Medicine and Sagol School of Neuroscience, Tel Aviv University, 6997801, Tel Aviv, Israel
| | - Barbara Vona
- Institute of Human Genetics, University Medical Center Göttingen, Göttingen, Germany
- Institute for Auditory Neuroscience and InnerEarLab, University Medical Center Göttingen, Göttingen, Germany
| | - Chana Vinkler
- Institute of Medical Genetics, Wolfson Medical Center, 58100, Holon, Israel
| | - Mordechai Shohat
- Bioinformatic Center, Cancer Research Institute, The Wohl Institute for Translational Medicine, Sheba Medical Center, Tel-Hashomer, Israel
- Sackler School of Medicine, Tel Aviv University, Tel Aviv, Israel
| | - Ortal Barel
- Bioinformatic Center, Cancer Research Institute, The Wohl Institute for Translational Medicine, Sheba Medical Center, Tel-Hashomer, Israel
- Sackler School of Medicine, Tel Aviv University, Tel Aviv, Israel
| | - Curtis R French
- Faculty of Medicine, Memorial University, 300 Prince Phillip Drive, St. John's, NL, Canada
| | - Sushma Singh
- Communication Sciences and Disorders, Elborn College, Western University, 1201 Western Road, London, ON, Canada
| | - Salem Werdyani
- Faculty of Medicine, Memorial University, 300 Prince Phillip Drive, St. John's, NL, Canada
| | - Taylor Burt
- Faculty of Medicine, Memorial University, 300 Prince Phillip Drive, St. John's, NL, Canada
| | - Nelly Abdelfatah
- Faculty of Medicine, Memorial University, 300 Prince Phillip Drive, St. John's, NL, Canada
| | - Jim Houston
- Faculty of Medicine, Memorial University, 300 Prince Phillip Drive, St. John's, NL, Canada
| | - Lance P Doucette
- Faculty of Medicine, Memorial University, 300 Prince Phillip Drive, St. John's, NL, Canada
| | - Jessica Squires
- Faculty of Medicine, Memorial University, 300 Prince Phillip Drive, St. John's, NL, Canada
| | - Fabian Glaser
- The Lorry I. Lokey Center for Life Sciences and Engineering, Technion-Israel Institute of Technology, Haifa, Israel
| | - Nicole M Roslin
- The Centre for Applied Genomics, The Hospital for Sick Children, Peter Gilgan Centre for Research and Learning, 686 Bay Street, Toronto, ON, Canada
| | - Daniel Vincent
- Genome Quebec Innovation Centre, McGill University, 740 Dr. Penfield Avenue, Montreal, QC, Canada
| | - Pascale Marquis
- Canadian Centre for Computational Genomics, McGill University and Genome Quebec Innovation Center, 740 Dr. Penfield Avenue, Montreal, QC, Canada
| | - Geoffrey Woodland
- Faculty of Medicine, Memorial University, 300 Prince Phillip Drive, St. John's, NL, Canada
| | - Touati Benoukraf
- Faculty of Medicine, Memorial University, 300 Prince Phillip Drive, St. John's, NL, Canada
| | - Alexia Hawkey-Noble
- Faculty of Medicine, Memorial University, 300 Prince Phillip Drive, St. John's, NL, Canada
| | - Karen B Avraham
- Department of Human Molecular Genetics and Biochemistry, Faculty of Medicine and Sagol School of Neuroscience, Tel Aviv University, 6997801, Tel Aviv, Israel
| | - Susan G Stanton
- Communication Sciences and Disorders, Elborn College, Western University, 1201 Western Road, London, ON, Canada
| | - Terry-Lynn Young
- Faculty of Medicine, Memorial University, 300 Prince Phillip Drive, St. John's, NL, Canada.
- Centre for Translational Genomics, Memorial University, 300 Prince Phillip Dr., St. John's, NL, Canada.
- Communication Sciences and Disorders, Elborn College, Western University, 1201 Western Road, London, ON, Canada.
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3
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Abdelfatah N, Chen R, Duff HJ, Seifer CM, Buffo I, Huculak C, Clarke S, Clegg R, Jassal DS, Gordon PMK, Ober C, Frosk P, Gerull B. Characterization of a Unique Form of Arrhythmic Cardiomyopathy Caused by Recessive Mutation in LEMD2. JACC Basic Transl Sci 2019; 4:204-221. [PMID: 31061923 PMCID: PMC6488817 DOI: 10.1016/j.jacbts.2018.12.001] [Citation(s) in RCA: 28] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/04/2018] [Revised: 11/02/2018] [Accepted: 12/03/2018] [Indexed: 02/08/2023]
Abstract
Nuclear envelope proteins have been shown to play an important role in the pathogenesis of inherited dilated cardiomyopathy. Here, we present a remarkable cardiac phenotype caused by a homozygous LEMD2 mutation in patients of the Hutterite population with juvenile cataract. Mutation carriers develop arrhythmic cardiomyopathy with mild impairment of left ventricular systolic function but severe ventricular arrhythmias leading to sudden cardiac death. Affected cardiac tissue from a deceased patient and fibroblasts exhibit elongated nuclei with abnormal condensed heterochromatin at the periphery. The patient fibroblasts demonstrate cellular senescence and reduced proliferation capacity, which may suggest an involvement of LEM domain containing protein 2 in chromatin remodeling processes and premature aging.
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Key Words
- ACM, arrhythmogenic cardiomyopathy
- BANF, barrier to autointegration factor
- CMR, cardiac magnetic resonance
- DAPI, 4′,6′-diamidino-2-phenylindole
- DCM, dilated cardiomyopathy
- DNA, deoxyribonucleic acid
- EMD, emerin
- ICD, implantable cardioverter-defibrillator
- LEMD2
- LEMD2, LEM domain containing protein 2
- LGE, late gadolinium enhancement
- LMNA, lamin A/C
- LV, left ventricular
- NE, nuclear envelope
- P, passage
- PBS, phosphate-buffered saline
- SAHF, senescence-associated heterochromatin foci
- SNV, single nucleotide variant
- chromatin remodeling
- dilated cardiomyopathy
- eGFP, enhanced green fluorescent protein
- inner nuclear membrane
- sudden death
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Affiliation(s)
- Nelly Abdelfatah
- Department of Cardiac Sciences, Libin Cardiovascular Institute of Alberta, Cumming School of Medicine, University of Calgary, Calgary, Alberta, Canada
| | - Ruping Chen
- Comprehensive Heart Failure Center, University Hospital Würzburg, Würzburg, Germany
| | - Henry J Duff
- Department of Cardiac Sciences, Libin Cardiovascular Institute of Alberta, Cumming School of Medicine, University of Calgary, Calgary, Alberta, Canada
| | - Colette M Seifer
- Section of Cardiology, Department of Internal Medicine, Max Rady College of Medicine, Rady Faculty of Health Sciences, University of Manitoba, Winnipeg, Manitoba, Canada
| | - Ilan Buffo
- Variety Children's Heart Centre, University of Manitoba, Winnipeg, Manitoba, Canada
| | - Cathleen Huculak
- Department of Medical Genetics, Alberta Health Services, Calgary, Alberta, Canada
| | - Stephanie Clarke
- Department of Biochemistry and Medical Genetics, Max Rady College of Medicine, Rady Faculty of Health Sciences, University of Manitoba, Winnipeg, Manitoba, Canada
| | - Robin Clegg
- Department of Pediatrics, University of Calgary, Calgary, Alberta, Canada
| | - Davinder S Jassal
- Section of Cardiology, Department of Internal Medicine, Max Rady College of Medicine, Rady Faculty of Health Sciences, University of Manitoba, Winnipeg, Manitoba, Canada
| | - Paul M K Gordon
- Cumming School of Medicine Centre for Health Genomics and Informatics, University of Calgary, Calgary, Alberta, Canada
| | - Carole Ober
- Department of Human Genetics, The University of Chicago, Chicago, Illinois
| | | | - Patrick Frosk
- Department of Biochemistry and Medical Genetics, Max Rady College of Medicine, Rady Faculty of Health Sciences, University of Manitoba, Winnipeg, Manitoba, Canada.,Department of Pediatrics and Child Health, Max Rady College of Medicine, Rady Faculty of Health Sciences, University of Manitoba, Winnipeg, Manitoba, Canada
| | - Brenda Gerull
- Department of Cardiac Sciences, Libin Cardiovascular Institute of Alberta, Cumming School of Medicine, University of Calgary, Calgary, Alberta, Canada.,Comprehensive Heart Failure Center, University Hospital Würzburg, Würzburg, Germany.,Department of Internal Medicine I, University Hospital Würzburg, Würzburg, Germany
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4
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Brodehl A, Belke DD, Garnett L, Martens K, Abdelfatah N, Rodriguez M, Diao C, Chen YX, Gordon PMK, Nygren A, Gerull B. Transgenic mice overexpressing desmocollin-2 (DSC2) develop cardiomyopathy associated with myocardial inflammation and fibrotic remodeling. PLoS One 2017; 12:e0174019. [PMID: 28339476 PMCID: PMC5365111 DOI: 10.1371/journal.pone.0174019] [Citation(s) in RCA: 47] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2016] [Accepted: 03/02/2017] [Indexed: 12/16/2022] Open
Abstract
Background Arrhythmogenic cardiomyopathy is an inherited heart muscle disorder leading to ventricular arrhythmias and heart failure, mainly as a result of mutations in cardiac desmosomal genes. Desmosomes are cell-cell junctions mediating adhesion of cardiomyocytes; however, the molecular and cellular mechanisms underlying the disease remain widely unknown. Desmocollin-2 is a desmosomal cadherin serving as an anchor molecule required to reconstitute homeostatic intercellular adhesion with desmoglein-2. Cardiac specific lack of desmoglein-2 leads to severe cardiomyopathy, whereas overexpression does not. In contrast, the corresponding data for desmocollin-2 are incomplete, in particular from the view of protein overexpression. Therefore, we developed a mouse model overexpressing desmocollin-2 to determine its potential contribution to cardiomyopathy and intercellular adhesion pathology. Methods and results We generated transgenic mice overexpressing DSC2 in cardiac myocytes. Transgenic mice developed a severe cardiac dysfunction over 5 to 13 weeks as indicated by 2D-echocardiography measurements. Corresponding histology and immunohistochemistry demonstrated fibrosis, necrosis and calcification which were mainly localized in patches near the epi- and endocardium of both ventricles. Expressions of endogenous desmosomal proteins were markedly reduced in fibrotic areas but appear to be unchanged in non-fibrotic areas. Furthermore, gene expression data indicate an early up-regulation of inflammatory and fibrotic remodeling pathways between 2 to 3.5 weeks of age. Conclusion Cardiac specific overexpression of desmocollin-2 induces necrosis, acute inflammation and patchy cardiac fibrotic remodeling leading to fulminant biventricular cardiomyopathy.
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Affiliation(s)
- Andreas Brodehl
- Department of Cardiac Sciences and Libin Cardiovascular Institute of Alberta, University of Calgary, Calgary, Alberta, Canada
| | - Darrell D. Belke
- Department of Cardiac Sciences and Libin Cardiovascular Institute of Alberta, University of Calgary, Calgary, Alberta, Canada
| | - Lauren Garnett
- Department of Cardiac Sciences and Libin Cardiovascular Institute of Alberta, University of Calgary, Calgary, Alberta, Canada
| | - Kristina Martens
- Department of Cardiac Sciences and Libin Cardiovascular Institute of Alberta, University of Calgary, Calgary, Alberta, Canada
| | - Nelly Abdelfatah
- Department of Cardiac Sciences and Libin Cardiovascular Institute of Alberta, University of Calgary, Calgary, Alberta, Canada
| | - Marcela Rodriguez
- Department of Cardiac Sciences and Libin Cardiovascular Institute of Alberta, University of Calgary, Calgary, Alberta, Canada
- Schulich School of Engineering, University of Calgary, Calgary, Alberta, Canada
| | - Catherine Diao
- Department of Cardiac Sciences and Libin Cardiovascular Institute of Alberta, University of Calgary, Calgary, Alberta, Canada
| | - Yong-Xiang Chen
- Department of Cardiac Sciences and Libin Cardiovascular Institute of Alberta, University of Calgary, Calgary, Alberta, Canada
| | - Paul M. K. Gordon
- Alberta Children's Hospital Research Institute Genomics and Bioinformatics Facility, University of Calgary, Calgary, Alberta, Canada
| | - Anders Nygren
- Department of Cardiac Sciences and Libin Cardiovascular Institute of Alberta, University of Calgary, Calgary, Alberta, Canada
- Schulich School of Engineering, University of Calgary, Calgary, Alberta, Canada
| | - Brenda Gerull
- Department of Cardiac Sciences and Libin Cardiovascular Institute of Alberta, University of Calgary, Calgary, Alberta, Canada
- Comprehensive Heart Failure Center and Department of Internal Medicine I, University Hospital Würzburg, Würzburg, Germany
- * E-mail:
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Pater JA, Benteau T, Griffin A, Penney C, Stanton SG, Predham S, Kielley B, Squires J, Zhou J, Li Q, Abdelfatah N, O'Rielly DD, Young TL. A common variant in CLDN14 causes precipitous, prelingual sensorineural hearing loss in multiple families due to founder effect. Hum Genet 2016; 136:107-118. [PMID: 27838790 PMCID: PMC5215284 DOI: 10.1007/s00439-016-1746-7] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2016] [Accepted: 11/07/2016] [Indexed: 12/16/2022]
Abstract
Genetic isolates provide unprecedented opportunities to identify pathogenic mutations and explore the full natural history of clinically heterogeneous phenotypes such as hearing loss. We noticed a unique audioprofile, characterized by prelingual and rapid deterioration of hearing thresholds at frequencies >0.5 kHz in several adults from unrelated families from the island population of Newfoundland. Targeted serial Sanger sequencing of probands for deafness alleles (n = 23) that we previously identified in this founder population was negative. Whole exome sequencing in four members of the largest family (R2010) identified a CLDN14 (DFNB29) variant [c.488C>T; p. (Ala163Val)], likely pathogenic, sensorineural hearing loss, autosomal recessive. Although not associated with deafness or disease, CLDN14 p.(Ala163Val) has been previously reported as a variant of uncertain significance (VUS). Targeted sequencing of 169 deafness probands identified one homozygote and one heterozygous carrier. Genealogical studies, cascade sequencing and haplotype analysis across four unrelated families showed all subjects with the unique audioprofile (n = 12) were also homozygous for p.(Ala163Val) and shared a 1.4 Mb DFNB29-associated haplotype on chromosome 21. Most significantly, sequencing 175 population controls revealed 1% of the population are heterozygous for CLDN14 p.(Ala163Val), consistent with a major founder effect in Newfoundland. The youngest CLDN14 [c.488C>T; p.(Ala163Val)] homozygote passed newborn screening and had normal hearing thresholds up to 3 years of age, which then deteriorated to a precipitous loss >1 kHz during the first decade. Our study suggests that genetic testing may be necessary to identify at-risk children in time to prevent speech, language and developmental delay.
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Affiliation(s)
- Justin A Pater
- Craig L. Dobbin Genetics Research Centre, Discipline of Genetics, Faculty of Medicine, Memorial University, 300 Prince Phillip Drive, St. John's, NL, A1B 3V6, Canada
| | - Tammy Benteau
- Craig L. Dobbin Genetics Research Centre, Discipline of Genetics, Faculty of Medicine, Memorial University, 300 Prince Phillip Drive, St. John's, NL, A1B 3V6, Canada
| | - Anne Griffin
- Craig L. Dobbin Genetics Research Centre, Discipline of Genetics, Faculty of Medicine, Memorial University, 300 Prince Phillip Drive, St. John's, NL, A1B 3V6, Canada
| | - Cindy Penney
- Craig L. Dobbin Genetics Research Centre, Discipline of Genetics, Faculty of Medicine, Memorial University, 300 Prince Phillip Drive, St. John's, NL, A1B 3V6, Canada
| | - Susan G Stanton
- Communication Sciences and Disorders, Western University, Elborn College, 1201 Western Road, London, ON, N6G 1H1, Canada
| | - Sarah Predham
- Craig L. Dobbin Genetics Research Centre, Discipline of Genetics, Faculty of Medicine, Memorial University, 300 Prince Phillip Drive, St. John's, NL, A1B 3V6, Canada
| | - Bernadine Kielley
- Department of Education and Early Childhood Development, Government of Newfoundland and Labrador, St. John's, NL, A1B 4J6, Canada
| | - Jessica Squires
- Craig L. Dobbin Genetics Research Centre, Discipline of Genetics, Faculty of Medicine, Memorial University, 300 Prince Phillip Drive, St. John's, NL, A1B 3V6, Canada
| | - Jiayi Zhou
- Craig L. Dobbin Genetics Research Centre, Discipline of Genetics, Faculty of Medicine, Memorial University, 300 Prince Phillip Drive, St. John's, NL, A1B 3V6, Canada
| | - Quan Li
- Craig L. Dobbin Genetics Research Centre, Discipline of Genetics, Faculty of Medicine, Memorial University, 300 Prince Phillip Drive, St. John's, NL, A1B 3V6, Canada
| | - Nelly Abdelfatah
- Craig L. Dobbin Genetics Research Centre, Discipline of Genetics, Faculty of Medicine, Memorial University, 300 Prince Phillip Drive, St. John's, NL, A1B 3V6, Canada
| | - Darren D O'Rielly
- Craig L. Dobbin Genetics Research Centre, Discipline of Genetics, Faculty of Medicine, Memorial University, 300 Prince Phillip Drive, St. John's, NL, A1B 3V6, Canada.,Molecular Diagnostic Laboratory, Eastern Health, Craig L. Dobbin Genetics Research Centre, Faculty of Medicine, Memorial University, 300 Prince Phillip Drive, St. John's, NL, A1B 3V6, Canada
| | - Terry-Lynn Young
- Craig L. Dobbin Genetics Research Centre, Discipline of Genetics, Faculty of Medicine, Memorial University, 300 Prince Phillip Drive, St. John's, NL, A1B 3V6, Canada. .,Communication Sciences and Disorders, Western University, Elborn College, 1201 Western Road, London, ON, N6G 1H1, Canada. .,Molecular Diagnostic Laboratory, Eastern Health, Craig L. Dobbin Genetics Research Centre, Faculty of Medicine, Memorial University, 300 Prince Phillip Drive, St. John's, NL, A1B 3V6, Canada.
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6
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Stanton SG, Griffin A, Stockley TL, Brown C, Young TL, Benteau T, Abdelfatah N. X-linked hearing loss: two gene mutation examples provide generalizable implications for clinical care. Am J Audiol 2014; 23:190-200. [PMID: 24687041 DOI: 10.1044/2014_aja-13-0040] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022] Open
Abstract
PURPOSE To describe the inheritance patterns and auditory phenotype features of 3 Canadian families with mutations in 2 X-linked "deafness" genes (DFNX). METHOD Audiological, medical, and family histories were collected and family members interviewed to compare hearing thresholds and case histories between cases with mutations in SMPX versus POU3F4. RESULTS The family pedigrees reveal characteristic X-linked inheritance patterns. Phenotypic features associated with the SMPX (DFNX4) mutation include early onset in males with rapid progression from mild and flat to sloping sensorineural loss, with highly variable onset and hearing loss severity in females. In contrast, phenotypic features associated with the POU3F4 (DFNX2) mutation are characterized by an early onset, mixed hearing loss with fluctuation in males, and a normal hearing phenotype reported for females. CONCLUSIONS The study shows how this unique inheritance pattern and both gender and mutation-specific phenotype variations can alert audiologists to the presence of X-linked genetic etiologies in their clinical practice. By incorporating this knowledge into clinical decision making, audiologists can facilitate the early identification of X-linked hearing loss and contribute to the effective team management of affected families.
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Affiliation(s)
| | | | - Tracy L. Stockley
- Hospital for Sick Children, Toronto, Ontario, Canada, and University of Toronto, Ontario, Canada
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7
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Abdelfatah N, McComiskey DA, Doucette L, Griffin A, Moore SJ, Negrijn C, Hodgkinson KA, King JJ, Larijani M, Houston J, Stanton SG, Young TL. Identification of a novel in-frame deletion in KCNQ4 (DFNA2A) and evidence of multiple phenocopies of unknown origin in a family with ADSNHL. Eur J Hum Genet 2013; 21:1112-9. [PMID: 23443030 DOI: 10.1038/ejhg.2013.5] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2012] [Revised: 12/12/2012] [Accepted: 12/28/2012] [Indexed: 11/09/2022] Open
Abstract
Autosomal dominant sensorineural hearing loss (ADSNHL) is extremely genetically heterogeneous, making it difficult to molecularly diagnose. We identified a multiplex (n=28 affected) family from the genetic isolate of Newfoundland, Canada with variable SNHL and used a targeted sequencing approach based on population-specific alleles in WFS1, TMPRSS3 and PCDH15; recurrent mutations in GJB2 and GJB6; and frequently mutated exons of KCNQ4, COCH and TECTA. We identified a novel, in-frame deletion (c.806_808delCCT: p.S269del) in the voltage-gated potassium channel KCNQ4 (DFNA2), which in silico modeling predicts to disrupt multimerization of KCNQ4 subunits. Surprisingly, 10/23 deaf relatives are non-carriers of p.S269del. Further molecular characterization of the DFNA2 locus in deletion carriers ruled out the possibility of a pathogenic mutation other than p.S269del at the DFNA2A/B locus and linkage analysis showed significant linkage to DFNA2 (maximum LOD=3.3). Further support of genetic heterogeneity in family 2071 was revealed by comparisons of audio profiles between p.S269del carriers and non-carriers suggesting additional and as yet unknown etiologies. We discuss the serious implications that genetic heterogeneity, in this case observed within a single family, has on molecular diagnostics and genetic counseling.
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Affiliation(s)
- Nelly Abdelfatah
- Discipline of Genetics, Faculty of Medicine, Memorial University, St John's, Newfoundland and Labrador, Canada
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Abdelfatah N, Merner N, Houston J, Benteau T, Griffin A, Doucette L, Stockley T, Lauzon JL, Young TL. A novel deletion in SMPX causes a rare form of X-linked progressive hearing loss in two families due to a founder effect. Hum Mutat 2012; 34:66-9. [PMID: 22911656 DOI: 10.1002/humu.22205] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2012] [Accepted: 07/31/2012] [Indexed: 12/31/2022]
Abstract
X-linked hearing loss is the rarest form of genetic hearing loss contributing to <1% of cases. We identified a multiplex family from Newfoundland (Family 2024) segregating X-linked hearing loss. Haplotyping of the X chromosome and sequencing of positional candidate genes revealed a novel point deletion (c.99delC) in SMPX which encodes a small muscle protein responsible for reducing mechanical stress during muscle contraction. This novel deletion causes a frameshift and a premature stop codon (p.Arg34GlufsX47). We successfully sequenced both SMPX wild-type and mutant alleles from cDNA of a lymphoblastoid cell line, suggesting that the mutant allele may not be degraded via nonsense-mediated mRNA decay. To investigate the role of SMPX in other subpopulations, we fully sequenced SMPX in 229 Canadian probands with hearing loss and identified a second Newfoundland Family (2196) with the same mutation, and a shared haplotype on the X chromosome, suggesting a common ancestor.
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Affiliation(s)
- Nelly Abdelfatah
- Faculty of Medicine, Memorial University, St John's, Newfoundland and Labrador, Canada
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