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Velde HM, Reurink J, Held S, Li CHZ, Yzer S, Oostrik J, Weeda J, Haer-Wigman L, Yntema HG, Roosing S, Pauleikhoff L, Lange C, Whelan L, Dockery A, Zhu J, Keegan DJ, Farrar GJ, Kremer H, Lanting CP, Damme M, Pennings RJE. Usher syndrome type IV: clinically and molecularly confirmed by novel ARSG variants. Hum Genet 2022; 141:1723-1738. [PMID: 35226187 PMCID: PMC9556359 DOI: 10.1007/s00439-022-02441-0] [Citation(s) in RCA: 16] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2021] [Accepted: 02/10/2022] [Indexed: 12/16/2022]
Abstract
AbstractUsher syndrome (USH) is an autosomal recessively inherited disease characterized by sensorineural hearing loss (SNHL) and retinitis pigmentosa (RP) with or without vestibular dysfunction. It is highly heterogeneous both clinically and genetically. Recently, variants in the arylsulfatase G (ARSG) gene have been reported to underlie USH type IV. This distinct type of USH is characterized by late-onset RP with predominantly pericentral and macular changes, and late onset SNHL without vestibular dysfunction. In this study, we describe the USH type IV phenotype in three unrelated subjects. We identified three novel pathogenic variants, two novel likely pathogenic variants, and one previously described pathogenic variant in ARSG. Functional experiments indicated a loss of sulfatase activity of the mutant proteins. Our findings confirm that ARSG variants cause the newly defined USH type IV and support the proposed extension of the phenotypic USH classification.
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Affiliation(s)
- Hedwig M. Velde
- Hearing and Genes, Department of Otorhinolaryngology, Radboudumc, Nijmegen, The Netherlands
- Donders Institute for Brain, Cognition and Behaviour, Radboudumc, Nijmegen, The Netherlands
| | - Janine Reurink
- Donders Institute for Brain, Cognition and Behaviour, Radboudumc, Nijmegen, The Netherlands
- Department of Human Genetics, Radboudumc, Nijmegen, The Netherlands
| | - Sebastian Held
- Department of Biochemistry, University of Kiel, Kiel, Germany
| | - Catherina H. Z. Li
- Donders Institute for Brain, Cognition and Behaviour, Radboudumc, Nijmegen, The Netherlands
- Department of Ophthalmology, Radboudumc, Nijmegen, The Netherlands
| | - Suzanne Yzer
- Donders Institute for Brain, Cognition and Behaviour, Radboudumc, Nijmegen, The Netherlands
- Department of Ophthalmology, Radboudumc, Nijmegen, The Netherlands
| | - Jaap Oostrik
- Hearing and Genes, Department of Otorhinolaryngology, Radboudumc, Nijmegen, The Netherlands
- Donders Institute for Brain, Cognition and Behaviour, Radboudumc, Nijmegen, The Netherlands
| | - Jack Weeda
- Department of Ophthalmology, Radboudumc, Nijmegen, The Netherlands
| | - Lonneke Haer-Wigman
- Donders Institute for Brain, Cognition and Behaviour, Radboudumc, Nijmegen, The Netherlands
- Department of Human Genetics, Radboudumc, Nijmegen, The Netherlands
| | - Helger G. Yntema
- Donders Institute for Brain, Cognition and Behaviour, Radboudumc, Nijmegen, The Netherlands
- Department of Human Genetics, Radboudumc, Nijmegen, The Netherlands
| | - Susanne Roosing
- Donders Institute for Brain, Cognition and Behaviour, Radboudumc, Nijmegen, The Netherlands
- Department of Human Genetics, Radboudumc, Nijmegen, The Netherlands
| | - Laurenz Pauleikhoff
- Eye Center, Medical Center - University of Freiburg, Faculty of Medicine, University of Freiburg, Freiburg, Germany
| | - Clemens Lange
- Eye Center, Medical Center - University of Freiburg, Faculty of Medicine, University of Freiburg, Freiburg, Germany
| | - Laura Whelan
- The School of Genetics and Microbiology, Smurfit Institute of Genetics, Trinity College Dublin, Dublin, Ireland
| | - Adrian Dockery
- The School of Genetics and Microbiology, Smurfit Institute of Genetics, Trinity College Dublin, Dublin, Ireland
- Next Generation Sequencing Laboratory, Pathology Department, The Mater Misericordiae University Hospital, Dublin, Ireland
| | - Julia Zhu
- Mater Clinical Ophthalmic Genetics Unit, The Mater Misericordiae University Hospital, Dublin, Ireland
| | - David J. Keegan
- Mater Clinical Ophthalmic Genetics Unit, The Mater Misericordiae University Hospital, Dublin, Ireland
| | - G. Jane Farrar
- The School of Genetics and Microbiology, Smurfit Institute of Genetics, Trinity College Dublin, Dublin, Ireland
| | - Hannie Kremer
- Hearing and Genes, Department of Otorhinolaryngology, Radboudumc, Nijmegen, The Netherlands
- Donders Institute for Brain, Cognition and Behaviour, Radboudumc, Nijmegen, The Netherlands
- Department of Human Genetics, Radboudumc, Nijmegen, The Netherlands
| | - Cornelis P. Lanting
- Hearing and Genes, Department of Otorhinolaryngology, Radboudumc, Nijmegen, The Netherlands
- Donders Institute for Brain, Cognition and Behaviour, Radboudumc, Nijmegen, The Netherlands
| | - Markus Damme
- Department of Biochemistry, University of Kiel, Kiel, Germany
| | - Ronald J. E. Pennings
- Hearing and Genes, Department of Otorhinolaryngology, Radboudumc, Nijmegen, The Netherlands
- Donders Institute for Brain, Cognition and Behaviour, Radboudumc, Nijmegen, The Netherlands
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Robijn SMM, Smits JJ, Sezer K, Huygen PLM, Beynon AJ, van Wijk E, Kremer H, de Vrieze E, Lanting CP, Pennings RJE. Genotype-Phenotype Correlations of Pathogenic COCH Variants in DFNA9: A HuGE Systematic Review and Audiometric Meta-Analysis. Biomolecules 2022; 12:220. [PMID: 35204720 PMCID: PMC8961530 DOI: 10.3390/biom12020220] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2021] [Revised: 01/21/2022] [Accepted: 01/23/2022] [Indexed: 02/04/2023] Open
Abstract
Pathogenic missense variants in COCH are associated with DFNA9, an autosomal dominantly inherited type of progressive sensorineural hearing loss with or without vestibular dysfunction. This study is a comprehensive overview of genotype-phenotype correlations using the PRISMA and HuGENet guidelines. Study characteristics, risk of bias, genotyping and data on the self-reported age of onset, symptoms of vestibular dysfunction, normative test results for vestibular function, and results of audiovestibular examinations were extracted for each underlying pathogenic COCH variant. The literature search yielded 48 studies describing the audiovestibular phenotypes of 27 DFNA9-associated variants in COCH. Subsequently, meta-analysis of audiometric data was performed by constructing age-related typical audiograms and by performing non-linear regression analyses on the age of onset and progression of hearing loss. Significant differences were found between the calculated ages of onset and progression of the audiovestibular phenotypes of subjects with pathogenic variants affecting either the LCCL domain of cochlin or the vWFA2 and Ivd1 domains. We conclude that the audiovestibular phenotypes associated with DFNA9 are highly variable. Variants affecting the LCCL domain of cochlin generally lead to more progression of hearing loss when compared to variants affecting the other domains. This review serves as a reference for prospective natural history studies in anticipation of mutation-specific therapeutic interventions.
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Affiliation(s)
- Sybren M. M. Robijn
- Department of Otorhinolaryngology, Hearing & Genes, Radboud University Medical Center, 6525 GA Nijmegen, The Netherlands; (S.M.M.R.); (J.J.S.); (K.S.); (P.L.M.H.); (A.J.B.); (E.v.W.); (E.d.V.); (C.P.L.)
- Donders Institute for Brain, Cognition and Behaviour, Radboud University Medical Center, 6500 GL Nijmegen, The Netherlands;
| | - Jeroen J. Smits
- Department of Otorhinolaryngology, Hearing & Genes, Radboud University Medical Center, 6525 GA Nijmegen, The Netherlands; (S.M.M.R.); (J.J.S.); (K.S.); (P.L.M.H.); (A.J.B.); (E.v.W.); (E.d.V.); (C.P.L.)
- Donders Institute for Brain, Cognition and Behaviour, Radboud University Medical Center, 6500 GL Nijmegen, The Netherlands;
- Department of Human Genetics, Radboud University Medical Center, 6525 GA Nijmegen, The Netherlands
| | - Kadriye Sezer
- Department of Otorhinolaryngology, Hearing & Genes, Radboud University Medical Center, 6525 GA Nijmegen, The Netherlands; (S.M.M.R.); (J.J.S.); (K.S.); (P.L.M.H.); (A.J.B.); (E.v.W.); (E.d.V.); (C.P.L.)
| | - Patrick L. M. Huygen
- Department of Otorhinolaryngology, Hearing & Genes, Radboud University Medical Center, 6525 GA Nijmegen, The Netherlands; (S.M.M.R.); (J.J.S.); (K.S.); (P.L.M.H.); (A.J.B.); (E.v.W.); (E.d.V.); (C.P.L.)
| | - Andy J. Beynon
- Department of Otorhinolaryngology, Hearing & Genes, Radboud University Medical Center, 6525 GA Nijmegen, The Netherlands; (S.M.M.R.); (J.J.S.); (K.S.); (P.L.M.H.); (A.J.B.); (E.v.W.); (E.d.V.); (C.P.L.)
| | - Erwin van Wijk
- Department of Otorhinolaryngology, Hearing & Genes, Radboud University Medical Center, 6525 GA Nijmegen, The Netherlands; (S.M.M.R.); (J.J.S.); (K.S.); (P.L.M.H.); (A.J.B.); (E.v.W.); (E.d.V.); (C.P.L.)
- Donders Institute for Brain, Cognition and Behaviour, Radboud University Medical Center, 6500 GL Nijmegen, The Netherlands;
| | - Hannie Kremer
- Donders Institute for Brain, Cognition and Behaviour, Radboud University Medical Center, 6500 GL Nijmegen, The Netherlands;
- Department of Human Genetics, Radboud University Medical Center, 6525 GA Nijmegen, The Netherlands
| | - Erik de Vrieze
- Department of Otorhinolaryngology, Hearing & Genes, Radboud University Medical Center, 6525 GA Nijmegen, The Netherlands; (S.M.M.R.); (J.J.S.); (K.S.); (P.L.M.H.); (A.J.B.); (E.v.W.); (E.d.V.); (C.P.L.)
- Donders Institute for Brain, Cognition and Behaviour, Radboud University Medical Center, 6500 GL Nijmegen, The Netherlands;
| | - Cornelis P. Lanting
- Department of Otorhinolaryngology, Hearing & Genes, Radboud University Medical Center, 6525 GA Nijmegen, The Netherlands; (S.M.M.R.); (J.J.S.); (K.S.); (P.L.M.H.); (A.J.B.); (E.v.W.); (E.d.V.); (C.P.L.)
- Donders Institute for Brain, Cognition and Behaviour, Radboud University Medical Center, 6500 GL Nijmegen, The Netherlands;
| | - Ronald J. E. Pennings
- Department of Otorhinolaryngology, Hearing & Genes, Radboud University Medical Center, 6525 GA Nijmegen, The Netherlands; (S.M.M.R.); (J.J.S.); (K.S.); (P.L.M.H.); (A.J.B.); (E.v.W.); (E.d.V.); (C.P.L.)
- Donders Institute for Brain, Cognition and Behaviour, Radboud University Medical Center, 6500 GL Nijmegen, The Netherlands;
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3
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Smits JJ, van Beelen E, Weegerink NJD, Oostrik J, Huygen PLM, Beynon AJ, Lanting CP, Kunst HPM, Schraders M, Kremer H, de Vrieze E, Pennings RJE. A Novel COCH Mutation Affects the vWFA2 Domain and Leads to a Relatively Mild DFNA9 Phenotype. Otol Neurotol 2021; 42:e399-e407. [PMID: 33710989 DOI: 10.1097/mao.0000000000003004] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
OBJECTIVE To study the genotype and phenotype of a Dutch family with autosomal dominantly inherited hearing loss. STUDY DESIGN Genotype-phenotype correlation study. Genetic analysis consisted of linkage analysis, variable number of tandem repeats analysis, and Sanger sequencing. Audiovestibular function was examined. Regression analysis was performed on pure tone audiometry and speech recognition scores and correlated with the age and/or level of hearing loss. SETTING Tertiary referral center. PATIENTS A large Dutch family presenting with sensorineural hearing loss. MAIN OUTCOME MEASURES Identification of the underlying genetic defect of the hearing loss in this family. Results of pure tone and speech audiometry, onset age, progression of hearing loss and vestibular (dys)function. RESULTS A novel mutation in COCH, c.1312C > T p.(Arg438Cys), cosegregates with hearing loss and a variable degree of vestibular (dys)function in this family. The reported mean age of onset of hearing loss is 33 years (range, 18-49 yr). Hearing loss primarily affects higher frequencies and its progression is relatively mild (0.8 dB/yr). Speech perception is remarkably well preserved in affected family members when compared with other DFNA9 families with different COCH mutations. CONCLUSION These findings expand the genotypic and phenotypic spectrum of DFNA9. The c.1312C > T mutation, which affects the vWFA2 domain, causes a relatively mild audiovestibular phenotype when compared with other COCH mutations.
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Affiliation(s)
- Jeroen J Smits
- Department of Otorhinolaryngology, Hearing & Genes
- Donders Institute for Brain, Cognition and Behaviour
| | | | | | - Jaap Oostrik
- Department of Otorhinolaryngology, Hearing & Genes
| | | | | | - Cornelis P Lanting
- Department of Otorhinolaryngology, Hearing & Genes
- Donders Institute for Brain, Cognition and Behaviour
| | - Henricus P M Kunst
- Department of Otorhinolaryngology, Hearing & Genes
- Radboud Institute for Health Sciences
| | - Margit Schraders
- Department of Human Genetics, Radboud University Medical Center, Nijmegen, the Netherlands
| | - Hannie Kremer
- Department of Otorhinolaryngology, Hearing & Genes
- Donders Institute for Brain, Cognition and Behaviour
- Department of Human Genetics, Radboud University Medical Center, Nijmegen, the Netherlands
| | - Erik de Vrieze
- Department of Otorhinolaryngology, Hearing & Genes
- Donders Institute for Brain, Cognition and Behaviour
| | - Ronald J E Pennings
- Department of Otorhinolaryngology, Hearing & Genes
- Donders Institute for Brain, Cognition and Behaviour
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Varga L, Danis D, Skopkova M, Masindova I, Slobodova Z, Demesova L, Profant M, Gasperikova D. Novel EYA4 variant in Slovak family with late onset autosomal dominant hearing loss: a case report. BMC MEDICAL GENETICS 2019; 20:84. [PMID: 31101089 PMCID: PMC6525401 DOI: 10.1186/s12881-019-0806-y] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/14/2018] [Accepted: 04/15/2019] [Indexed: 12/15/2022]
Abstract
Background Progressive bilateral sensorineural deafness in postlingual period may be linked to many different etiologies including genetic factors. Identification of the exact deafness cause may, therefore, be quite challenging. Here we present a family with late-onset hearing loss as an autosomal dominant trait caused by a novel EYA4 mutation. Case presentation Forty-four years old female proband clinically investigated for progressive hearing loss and occasional dizziness with positive family history for deafness was subject to molecular-genetic testing. Patient’s DNA sample was analyzed by whole exome sequencing. We identified a novel missense variant c.804G > C located at the last base pair of exon 10 in EYA4. Candidate variant was confirmed by Sanger sequencing in the proband and her family members. In silico prediction tools and co-segregation analysis were used to indicate pathogenicity of the identified variant. To confirm our hypothesis, we performed minigene assay to demonstrate if the transcript of exon 10 in EYA4 is present. We provide evidence that this mutation in vitro compromises donor site functionality and causes exon 10 skipping and frameshift that most likely results in nonsense-mediated mRNA decay. The onset of moderate to severe hearing loss in the family ranged from 10 to 40 years. The normal cardiac phenotype was confirmed by ECG and echocardiography. Conclusions We identified a novel EYA4 mutation associated with adult-onset autosomal dominant sensorineural hearing loss. This report extends the knowledge of spectrum of EYA4 mutations and demonstrates the pathogenicity of a variant affecting specific position in the gene. A comprehensive review of known EYA4 mutations is also given and their impact on cardiac phenotype is discussed. Our findings highlight the importance of genetic testing and complex clinical assessment in patients with familial progressive hearing loss.
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Affiliation(s)
- Lukas Varga
- Department of Otorhinolaryngology - Head and Neck Surgery, Faculty of Medicine and University Hospital, Comenius University, Bratislava, Slovakia.,Diabgene Laboratory, Biomedical Research Center, University Science Park for Biomedicine, Slovak Academy of Sciences, Bratislava, Slovakia
| | - Daniel Danis
- Diabgene Laboratory, Biomedical Research Center, University Science Park for Biomedicine, Slovak Academy of Sciences, Bratislava, Slovakia
| | - Martina Skopkova
- Diabgene Laboratory, Biomedical Research Center, University Science Park for Biomedicine, Slovak Academy of Sciences, Bratislava, Slovakia
| | - Ivica Masindova
- Diabgene Laboratory, Biomedical Research Center, University Science Park for Biomedicine, Slovak Academy of Sciences, Bratislava, Slovakia
| | - Zuzana Slobodova
- Department of Otorhinolaryngology - Head and Neck Surgery, Faculty of Medicine and University Hospital, Comenius University, Bratislava, Slovakia.,Diabgene Laboratory, Biomedical Research Center, University Science Park for Biomedicine, Slovak Academy of Sciences, Bratislava, Slovakia
| | - Lucia Demesova
- Department of Otorhinolaryngology - Head and Neck Surgery, Faculty of Medicine and University Hospital, Comenius University, Bratislava, Slovakia
| | - Milan Profant
- Department of Otorhinolaryngology - Head and Neck Surgery, Faculty of Medicine and University Hospital, Comenius University, Bratislava, Slovakia
| | - Daniela Gasperikova
- Diabgene Laboratory, Biomedical Research Center, University Science Park for Biomedicine, Slovak Academy of Sciences, Bratislava, Slovakia.
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Li L, Sajdyk T, Smith EML, Chang CW, Li C, Ho RH, Hutchinson R, Wells E, Skiles JL, Winick N, Martin PL, Renbarger JL. Genetic Variants Associated With Vincristine-Induced Peripheral Neuropathy in Two Populations of Children With Acute Lymphoblastic Leukemia. Clin Pharmacol Ther 2019; 105:1421-1428. [PMID: 30506673 DOI: 10.1002/cpt.1324] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2018] [Accepted: 11/25/2018] [Indexed: 01/29/2023]
Abstract
Vincristine is one of the core chemotherapy agents used in the treatment of pediatric acute lymphoblastic leukemia (ALL). However, one of the major toxicities resulting from vincristine exposure is vincristine-induced peripheral neuropathy (VIPN). When VIPN results in significant morbidity, the vincristine dose may need to be reduced, thus potentially decreasing the effectiveness of treatment. To date, there are no robust biomarkers used clinically to determine which patients will be at risk for worse neuropathy. The current study included genomewide association study (GWAS) in two independent cohorts: Pediatric Oncology Group (POG) ALL trials and a multicenter study based at Indiana University in children with ALL. A meta-analysis of the cohorts identified two single-nucleotide polymorphisms (SNPs), rs1045644 and rs7963521, as being significantly (P value threshold 0.05/4749 = 1.05E-05) associated with neuropathy. Subsequently these SNPs may be effective biomarkers of VIPN in children with ALL.
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Affiliation(s)
- Lang Li
- Ohio State University, Columbus, Ohio, USA
| | - Tammy Sajdyk
- Indiana University School of Medicine, Indianapolis, Indiana, USA
| | | | | | - Claire Li
- Merck, Upper Gwynedd, Pennsylvania, USA
| | - Richard H Ho
- Vanderbilt University, Nashville, Tennessee, USA
| | | | - Elizabeth Wells
- Children's Children Research Institute, Washington, District of Columbia, USA
| | - Jodi L Skiles
- Indiana University School of Medicine, Indianapolis, Indiana, USA
| | - Naomi Winick
- University of Texas Southwestern Medical Center, Dallas, Texas, USA
| | - Paul L Martin
- Duke University Medical Center, Durham, North Carolina, USA
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De Belder J, Matthysen S, Claes AJ, Mertens G, Van de Heyning P, Van Rompaey V. Does Otovestibular Loss in the Autosomal Dominant Disorder DFNA9 Have an Impact of on Cognition? A Systematic Review. Front Neurosci 2018; 11:735. [PMID: 29375286 PMCID: PMC5767272 DOI: 10.3389/fnins.2017.00735] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2017] [Accepted: 12/18/2017] [Indexed: 12/21/2022] Open
Abstract
Background and Purpose: Cognitive impairment has been observed in patients with bilateral vestibular loss (BVL) and in patients with sensorineural hearing loss (SNHL). DFNA9 is an autosomal dominant disorder that causes a combination of both sensory deficits by the 3rd to 5th decade. We therefore hypothesize a combined detrimental effect on cognition. The aim of this systematic review was to identify studies related to DFNA9 in general and its relationship with cognitive impairment more specifically. Materials and Methods: Several databases including Medline, Cochrane Database of Systematic Reviews, Cochrane Central Register of Controlled Trials, ISI Web of Knowledge, and Web of Science were searched to accumulate information about DFNA9-mutations, including phenotype, genotype, pathophysiology, quality of life (QOL), and imaging in general and cognitive function more specifically. A qualitative analysis was performed on the 55 articles that qualified. Results: The clinical features of DFNA9 are different along the 24 COCH mutations, described up to now. Vestibular symptoms generally present themselves a few years after SNHL onset in mutations associated with the vWFA-domain although they can precede SNHL onset in other mutations associated with the LCCL-domain. QoL has not been studied extensively in DFNA9, although scarce work is available on the positive impact of cochlear implantation to rehabilitate hearing. No studies were found evaluating cognition in DFNA9 patients. Conclusion: Although cognitive impairment has been demonstrated in patients with hearing loss as well as in patients with BVL, no studies have been reported on the combination of both sensory deficits, such as in DFNA9. Further research is warranted to correlate otovestibular status with cognition.
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Affiliation(s)
- Jonas De Belder
- Faculty of Medicine and Health Sciences, University of Antwerp, Antwerp, Belgium
| | - Stijn Matthysen
- Faculty of Medicine and Health Sciences, University of Antwerp, Antwerp, Belgium
| | - Annes J Claes
- Faculty of Medicine and Health Sciences, University of Antwerp, Antwerp, Belgium.,Department of Otorhinolaryngology and Head and Neck Surgery, Antwerp University Hospital, Edegem, Belgium
| | - Griet Mertens
- Faculty of Medicine and Health Sciences, University of Antwerp, Antwerp, Belgium.,Department of Otorhinolaryngology and Head and Neck Surgery, Antwerp University Hospital, Edegem, Belgium
| | - Paul Van de Heyning
- Faculty of Medicine and Health Sciences, University of Antwerp, Antwerp, Belgium.,Department of Otorhinolaryngology and Head and Neck Surgery, Antwerp University Hospital, Edegem, Belgium
| | - Vincent Van Rompaey
- Faculty of Medicine and Health Sciences, University of Antwerp, Antwerp, Belgium.,Department of Otorhinolaryngology and Head and Neck Surgery, Antwerp University Hospital, Edegem, Belgium
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7
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Wang Q, Fei P, Gu H, Zhang Y, Ke X, Liu Y. Different Phenotypes of the Two Chinese Probands with the Same c.889G>A (p.C162Y) Mutation in COCH Gene Verify Different Mechanisms Underlying Autosomal Dominant Nonsyndromic Deafness 9. PLoS One 2017; 12:e0170011. [PMID: 28099493 PMCID: PMC5243127 DOI: 10.1371/journal.pone.0170011] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2016] [Accepted: 12/25/2016] [Indexed: 11/18/2022] Open
Abstract
OBJECTIVES By analyzing the different phenotypes of two Chinese DFNA9 families with the same mutation located in the intervening region between the LCCL and vWFA domains of cochlin and testing the functional changes in the mutant cochlin, we investigated the different pathogeneses for mutations in LCCL and vWFA domains. METHODS Targeted next-generation sequencing for deafness-related genes was used to identify the mutation in the proband in family #208. The probands of family #208 and family #32 with the same p.C162Y mutation were followed for more than 3 years to evaluate the progression of hearing loss and vestibular dysfunction using pure-tone audiometry, caloric testing, electrocochleogram, vestibular-evoked myogenic potential, and video head-impulse test. The disruption of normal cleavage to produce secreted LCCL domain fragments and the tendency to form aggregations of mutant cochlins were tested by in vitro cell experiments. RESULTS The two families showed different clinical symptoms. Family #32 was identified as having early-onset, progressive sensorineural hearing loss, similar to the symptoms in DFNA9 patients with cochlin mutations in the vWFA domain. The proband of family #208 endured late-onset recurrent paroxysmal vertigo attacks and progressively deteriorating hearing, similar to symptoms in those with cochlin mutations in the LCCL domain. We therefore suggest that the disrupted cleavage of the LCCL domain fragment is likely to cause vestibular dysfunction, and aggregation of mutant cochlin caused by mutations in the vWFA domain is responsible for early-onset hearing loss. The p.C162Y mutation causes either disruption of LCCL domain fragment cleavage or aggregation of mutant cochlin, resulting in the different phenotypes in the two families. CONCLUSION This study demonstrates that DFNA9 families with the same genotype may have significantly different phenotypes. The mutation site in cochlin is related to the pathological mechanism underlying the different phenotypes.
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Affiliation(s)
- Qi Wang
- Department of Otolaryngology, Head and Neck Surgery, Peking University First Hospital, Beijing, China
| | - Peipei Fei
- Department of Otolaryngology, Head and Neck Surgery, Peking University First Hospital, Beijing, China
| | - Hongbo Gu
- Department of Otolaryngology, Head and Neck Surgery, Peking University First Hospital, Beijing, China
| | - Yanmei Zhang
- Department of Otolaryngology, Head and Neck Surgery, Peking University First Hospital, Beijing, China
| | - Xiaomei Ke
- Department of Otolaryngology, Head and Neck Surgery, Peking University First Hospital, Beijing, China
| | - Yuhe Liu
- Department of Otolaryngology, Head and Neck Surgery, Peking University First Hospital, Beijing, China
- * E-mail:
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Progress and prospects in human genetic research into age-related hearing impairment. BIOMED RESEARCH INTERNATIONAL 2014; 2014:390601. [PMID: 25140308 PMCID: PMC4130297 DOI: 10.1155/2014/390601] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Received: 01/29/2014] [Accepted: 06/26/2014] [Indexed: 11/23/2022]
Abstract
Age-related hearing impairment (ARHI) is a complex, multifactorial disorder that is attributable to confounding intrinsic and extrinsic factors. The degree of impairment shows substantial variation between individuals, as is also observed in the senescence of other functions. This individual variation would seem to refute the stereotypical view that hearing deterioration with age is inevitable and may indicate that there is ample scope for preventive intervention. Genetic predisposition could account for a sizable proportion of interindividual variation. Over the past decade or so, tremendous progress has been made through research into the genetics of various forms of hearing impairment, including ARHI and our knowledge of the complex mechanisms of auditory function has increased substantially. Here, we give an overview of recent investigations aimed at identifying the genetic risk factors involved in ARHI and of what we currently know about its pathophysiology. This review is divided into the following sections: (i) genes causing monogenic hearing impairment with phenotypic similarities to ARHI; (ii) genes involved in oxidative stress, biologic stress responses, and mitochondrial dysfunction; and (iii) candidate genes for senescence, other geriatric diseases, and neurodegeneration. Progress and prospects in genetic research are discussed.
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