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Gombojav B, Erdenechuluun J, Makhbal Z, Danshiitsoodol N, Purevdorj E, Jargalmaa M, Batsaikhan T, Lin PH, Lu YS, Lo MY, Tseng HY, Tsai CY, Wu CC. Genetic Basis of Hearing Loss in Mongolian Patients: A Next-Generation Sequencing Study. Genes (Basel) 2024; 15:1227. [PMID: 39336818 PMCID: PMC11431586 DOI: 10.3390/genes15091227] [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: 07/29/2024] [Revised: 09/12/2024] [Accepted: 09/18/2024] [Indexed: 09/30/2024] Open
Abstract
BACKGROUND/OBJECTIVE The genetic landscape of sensorineural hearing impairment (SNHI) varies across populations. In Mongolia, previous studies have shown a lower prevalence of GJB2 mutations and a higher frequency of variants in other deafness-related genes. This study aimed to investigate the genetic variants associated with idiopathic SNHI in Mongolian patients. METHODS We utilized the next-generation sequencing for investigating the causative mutations in 99 Mongolian patients with SNHI. RESULTS We identified pathogenic variants in 53 of the 99 SNHI patients (54%), with SLC26A4 being the most frequently mutated gene. The c.919-2A>G variant in SLC26A4 was the most prevalent, accounting for 46.2% of the mutant alleles. In addition, we identified 19 other known and 21 novel mutations in a total of 21 SNHI genes in autosomal recessive or dominant inheritance patterns. CONCLUSIONS Our findings expand the understanding of the genetic landscape of SNHI in Mongolia and highlight the importance of considering population-specific variations in genetic testing and counseling for SNHI.
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Affiliation(s)
- Bayasgalan Gombojav
- Department of Epidemiology and Biostatistics, School of Public Health, Mongolian National University of Medical Sciences, Ulaanbaatar 14210, Mongolia
- Healthy Twin Registry of Mongolia, Ulaanbaatar 14210, Mongolia
| | - Jargalkhuu Erdenechuluun
- Department of Otolaryngology, School of Medicine, Mongolian National University of Medical Sciences, Ulaanbaatar 14170, Mongolia
- The EMJJ Otolaryngology Hospital, Ulaanbaatar 14210, Mongolia
| | - Zaya Makhbal
- The EMJJ Otolaryngology Hospital, Ulaanbaatar 14210, Mongolia
| | - Narandalai Danshiitsoodol
- Healthy Twin Registry of Mongolia, Ulaanbaatar 14210, Mongolia
- Department of Probiotic Science for Preventive Medicine, Graduate School of Biomedical and Health Sciences, Hiroshima University, Hiroshima 7348551, Japan
| | - Erkhembulgan Purevdorj
- Healthy Twin Registry of Mongolia, Ulaanbaatar 14210, Mongolia
- Department of Genetics, School of Biomedicine, Mongolian National University of Medical Sciences, Ulaanbaatar 14210, Mongolia
| | | | - Tserendulam Batsaikhan
- Department of Otolaryngology, School of Medicine, Mongolian National University of Medical Sciences, Ulaanbaatar 14170, Mongolia
- The EMJJ Otolaryngology Hospital, Ulaanbaatar 14210, Mongolia
| | - Pei-Hsuan Lin
- Department of Otolaryngology, National Taiwan University Hospital, Taipei 100225, Taiwan
| | - Yue-Sheng Lu
- Department of Otolaryngology, National Taiwan University Hospital, Taipei 100225, Taiwan
| | - Ming-Yu Lo
- Department of Otolaryngology, National Taiwan University Hospital, Taipei 100225, Taiwan
| | - Hsin-Yi Tseng
- Department of Otolaryngology, National Taiwan University Hospital, Taipei 100225, Taiwan
| | - Cheng-Yu Tsai
- Department of Otolaryngology, National Taiwan University Hospital, Taipei 100225, Taiwan
| | - Chen-Chi Wu
- Department of Otolaryngology, National Taiwan University Hospital, Taipei 100225, Taiwan
- Department of Medical Research, National Taiwan University Hospital Hsin-Chu Branch, Hsinchu 30261, Taiwan
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Alerasool M, Eslahi A, Vona B, Kahaei MS, Mojaver NK, Rajati M, Pasdar A, Ghasemi MM, Saburi E, Ardehaie RM, Aval MH, Tale MR, Nourizadeh N, Afzalzadeh MR, Niknezhad HT, Mojarrad M. Genetic landscape of hearing loss in prelingual deaf patients of eastern Iran: Insights from exome sequencing analysis. Clin Genet 2024. [PMID: 39107234 DOI: 10.1111/cge.14599] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2024] [Revised: 07/17/2024] [Accepted: 07/18/2024] [Indexed: 08/09/2024]
Abstract
Hearing loss is one of the most prevalent genetic disorders in humans. Locus and allelic heterogeneity cause fundamental challenges in hearing loss genetic diagnosis and management of patients and their families. This study examined the genetic profile of patients with prelingual hearing loss who were referred to the Genetic Foundation of Khorasan Razavi spanning over a decade. Deleterious variants in GJB2 were evaluated through Sanger sequencing among 745 non-syndromic hearing loss patients. Furthermore, exome sequencing was applied in 250 patients with negative GJB2 sequencing results and 30 patients with syndromic hearing loss. The findings revealed a relatively low frequency of GJB2 variants among the studied patients. Exome sequencing successfully identified the genetic causes of hearing loss in 70% of the patients. Moreover, variants in 10 genes, namely SLC26A4, MYO15A, TMPRSS3, TMC1, OTOF, CDH23, PJVK, MYO7A, TECTA, and PCDH15, accounted for 66% of the positive exome sequencing findings in this study. At least three prevalent founder alleles in the hearing-impaired population of eastern Iran were identified. This study emphasizes the efficiency of exome sequencing as a powerful tool for determining the etiology of prelingual hearing loss in the eastern Iranian population.
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Affiliation(s)
- Masoome Alerasool
- Faculty of Medicine, Department of Medical Genetics, Mashhad University of Medical Sciences, Mashhad, Iran
- Medical Genetics Research Center, Mashhad University of Medical Sciences, Mashhad, Iran
- Genetic Laboratory, Genetic Foundation of Khorasan Razavi, Mashhad, Iran
| | - Atieh Eslahi
- Faculty of Medicine, Department of Medical Genetics, Mashhad University of Medical Sciences, Mashhad, Iran
- Medical Genetics Research Center, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Barbara Vona
- Institute of Human Genetics, University Medical Center Göttingen, Göttingen, Germany
- Institute for Auditory Neuroscience and InnerEarLab, University Medical Center Göttingen, Göttingen, Germany
| | - Mir Salar Kahaei
- Faculty of Medicine, Department of Medical Genetics, Mashhad University of Medical Sciences, Mashhad, Iran
- Medical Genetics Research Center, Mashhad University of Medical Sciences, Mashhad, Iran
| | | | - Mohsen Rajati
- Sinus and Surgical Endoscopic Research Center, Mashhad University of Medical Sciences, Mashhad, Iran
- Chochlear Implantation Department, Ear Foundation Research Center, Mashhad, Iran
| | - Alireza Pasdar
- Faculty of Medicine, Department of Medical Genetics, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Mohammad Mehdi Ghasemi
- Sinus and Surgical Endoscopic Research Center, Mashhad University of Medical Sciences, Mashhad, Iran
- Chochlear Implantation Department, Ear Foundation Research Center, Mashhad, Iran
| | - Ehsan Saburi
- Faculty of Medicine, Department of Medical Genetics, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Reza Mousavi Ardehaie
- Faculty of Medicine, Department of Medical Genetics, Mashhad University of Medical Sciences, Mashhad, Iran
- Medical Genetics Research Center, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Majid Hadadi Aval
- Chochlear Implantation Department, Ear Foundation Research Center, Mashhad, Iran
- Paramedical and Rehabilitation Faculty, University of Medical Sciences, Mashhad, Iran
- Chochlear Implantation Division, Khorasan Cochlear Implant Center, Mashhad, Iran
| | - Mohammad Reza Tale
- Chochlear Implantation Department, Ear Foundation Research Center, Mashhad, Iran
- Chochlear Implantation Division, Khorasan Cochlear Implant Center, Mashhad, Iran
| | - Navid Nourizadeh
- Sinus and Surgical Endoscopic Research Center, Mashhad University of Medical Sciences, Mashhad, Iran
- Chochlear Implantation Department, Ear Foundation Research Center, Mashhad, Iran
| | - Mohammad Reza Afzalzadeh
- Sinus and Surgical Endoscopic Research Center, Mashhad University of Medical Sciences, Mashhad, Iran
- Chochlear Implantation Department, Ear Foundation Research Center, Mashhad, Iran
| | - Hamid Tayarani Niknezhad
- Chochlear Implantation Department, Ear Foundation Research Center, Mashhad, Iran
- Chochlear Implantation Division, Khorasan Cochlear Implant Center, Mashhad, Iran
| | - Majid Mojarrad
- Faculty of Medicine, Department of Medical Genetics, Mashhad University of Medical Sciences, Mashhad, Iran
- Medical Genetics Research Center, Mashhad University of Medical Sciences, Mashhad, Iran
- Genetic Laboratory, Genetic Foundation of Khorasan Razavi, Mashhad, Iran
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Mu Q, Bai L, Xu B, Du H, Jiang Z, Huang S, Gao B, Wu Q, Zhao H, Dai P, Jiang Y. A capture-based method of prenatal cell-free DNA screening for autosomal recessive non-syndromic hearing loss. Prenat Diagn 2024; 44:1043-1052. [PMID: 38488843 DOI: 10.1002/pd.6550] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2023] [Revised: 02/18/2024] [Accepted: 02/19/2024] [Indexed: 08/11/2024]
Abstract
OBJECTIVE This study aimed to develop and validate a prenatal cell-free DNA (cfDNA) screening method that uses capture-based enrichment to genotype fetal autosomal recessive disorders. This method was applied in pregnancies at high risk of autosomal recessive non-syndromic hearing loss (ARNSHL) to assess its accuracy and effectiveness. METHODS This assay measured the allele counts in both white blood cell DNA and cfDNA from the blood samples of pregnant women using a capture-based next-generation sequencing method. It then applied a binomial model to infer the fetal genotypes with the maximum likelihood. Ninety-four pregnant couples that were carriers of variants of ARNSHL in GJB2 or SLC26A4 were enrolled. The fetal genotypes deduced using this screening method were compared with the results of genetic diagnosis using amniocentesis. RESULTS Of the 94 couples, 65 carried more than one variant, resulting in 170 single-nucleotide polymorphism (SNP) loci to be inferred in the fetuses. Of the 170 fetal SNP genotypes, 150 (88.2%) had high confidence calls and 139 (92.7%) of these matched the genotypes obtained by amniocentesis result. Out of the remaining 20 (11.8%) cases with low-confidence calls, only 14 (70.0%) were concordant with genetic diagnosis using amniocentesis. The concordance rate was 100% for sites where the maternal genotype was wild-type homozygous. The discordance was site-biased, with each locus showing a consistent direction of discordance. Genetic diagnosis identified a total of 19 wild-type homozygotes, 46 heterozygotes, 19 compound heterozygotes, and 10 pathogenic homozygotes. This screening method correctly genotyped 81.9% (77/94) of fetuses and demonstrated a sensitivity of 89.7% and a specificity of 89.2% for correctly identifying ARNSHL. CONCLUSION This capture-based method of prenatal screening by cfDNA demonstrated strong potential for fetal genotyping of autosomal recessive disorders.
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Affiliation(s)
- Qian Mu
- Department of Otolaryngology-Head and Neck Surgery, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
- Ear Institute, Shanghai Jiao Tong University School of Medicine, Shanghai, China
- Shanghai Key Laboratory of Translational Medicine on Ear and Nose Diseases, Shanghai, China
| | - Ling Bai
- Beijing USCI Medical Laboratory, Beijing, China
| | - Bing Xu
- Beijing USCI Medical Laboratory, Beijing, China
| | - Huawen Du
- Department of Gynecology and Obstetrics, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | | | - Shasha Huang
- Department of Otolaryngology, Head and Neck Surgery, Institute of Otolaryngology, Chinese PLA General Hospital, Beijing, China
| | - Bo Gao
- Department of Otolaryngology, Head and Neck Surgery, Institute of Otolaryngology, Chinese PLA General Hospital, Beijing, China
| | - Qixi Wu
- Beijing USCI Medical Laboratory, Beijing, China
| | | | - Pu Dai
- Department of Otolaryngology, Head and Neck Surgery, Institute of Otolaryngology, Chinese PLA General Hospital, Beijing, China
| | - Yi Jiang
- Department of Otolaryngology-Head and Neck Surgery, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
- Ear Institute, Shanghai Jiao Tong University School of Medicine, Shanghai, China
- Shanghai Key Laboratory of Translational Medicine on Ear and Nose Diseases, Shanghai, China
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Kriukelis R, Gabbett MT, Beswick R, McInerney-Leo AM, Driscoll C, Liddle K. The congenital hearing phenotype in GJB2 in Queensland, Australia: V37I and mild hearing loss predominates. Eur J Hum Genet 2024:10.1038/s41431-024-01584-0. [PMID: 38486023 DOI: 10.1038/s41431-024-01584-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/02/2024] [Revised: 02/12/2024] [Accepted: 02/27/2024] [Indexed: 03/17/2024] Open
Abstract
GJB2 was originally identified in severe, non-syndromic sensorineural hearing loss (SNHL), but was subsequently associated with mild and moderate SNHL. Given the increasing utilisation of genetic testing pre-conceptually, prenatally, and neonatally, it is crucial to understand genotype-phenotype correlations. This study evaluated the nature and frequency of GJB2 variants in an Australian paediatric population with varying degrees of SNHL ascertained through newborn hearing screening. Audiograms from individuals with GJB2 variants and/or a GJB6 deletion (GJB6-D13S11830) were retrospectively reviewed (n = 127). Two-thirds were biallelic (homozygous/compound heterozygous) for pathogenic/likely pathogenic variants of GJB2 and/or GJB6 (n = 80). The most frequent variant was c.109 G > A, followed by c.35delG and c.101 T > C. Compared to biallelic carriage of other GJB2 variants, c.109 G > A positive individuals (homozygous/compound heterozygous) were more likely to have mild HL at their initial and latest audiograms (p = 0.0004). Biallelic carriage of c.35delG was associated with moderately-severe or greater SNHL at both initial and latest audiograms (p = 0.007). The c.101 T > C variant presented with milder SNHL and U-shaped audiograms (p = 0.02). In this agnostically identified cohort, mild SNHL predominated in GJB2/GJB6 carriers in contrast to previous studies targeting individuals with significant loss. Consequently, c.109 G > A, associated with milder phenotypes, was the most frequent. This study provides valuable data to support prognostic confidence in genetic counselling.
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Affiliation(s)
| | - Michael T Gabbett
- Centre for Genomics and Personalised Health, School of Biomedical Sciences, Queensland University of Technology, Brisbane, QLD, Australia
| | - Rachael Beswick
- University of Queensland Centre for Children's Health Research, South Brisbane, QLD, Australia
- Healthy Hearing Program, Children's Health Queensland Hospital and Health Service, Brisbane, QLD, Australia
- School of Health and Rehabilitation Sciences, University of Queensland, Brisbane, QLD, Australia
| | - Aideen M McInerney-Leo
- Frazer Institute, University of Queensland, Dermatology Research Centre, Brisbane, QLD, Australia
| | - Carlie Driscoll
- School of Health and Rehabilitation Sciences, University of Queensland, Brisbane, QLD, Australia
| | - Karen Liddle
- Queensland Children's Hospital, South Brisbane, QLD, Australia.
- University of Queensland Centre for Children's Health Research, South Brisbane, QLD, Australia.
- Frazer Institute, University of Queensland, Dermatology Research Centre, Brisbane, QLD, Australia.
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5
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Li YQ, Ma H, Wang QY, Liu DS, Wang W, Li SX, Zuo RX, Shen T, Zhu BS, Sa YL. Low frequency of SLC26A4 c.919-2A > G variant among patients with nonsyndromic hearing loss in Yunnan of Southwest China. BMC Med Genomics 2024; 17:55. [PMID: 38378613 PMCID: PMC10877886 DOI: 10.1186/s12920-024-01829-3] [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: 02/10/2023] [Accepted: 02/09/2024] [Indexed: 02/22/2024] Open
Abstract
BACKGROUND Gene variants are responsible for more than half of hearing loss, particularly in nonsyndromic hearing loss (NSHL). The most common pathogenic variant in SLC26A4 gene found in East Asian populations is c.919-2A > G followed by c.2168A > G (p.H723R). This study was to evaluate their variant frequencies in patients with NSHL from special education schools in nine different areas of Southwest China's Yunnan. METHODS We performed molecular characterization by PCR-products directly Sanger sequencing of the SLC26A4 c.919-2AG and c.2168 A > G variants in 1167 patients with NSHL including 533 Han Chinese and 634 ethnic minorities. RESULTS The SLC26A4 c.919-2A > G variant was discovered in 8 patients with a homozygous state (0.69%) and twenty-five heterozygous (2.14%) in 1167 patients with NSHL. The total carrier rate of the c.919-2A > G variant was found in Han Chinese patients with 4.50% and ethnic minority patients with 1.42%. A significant difference existed between the two groups (P < 0.05). The c.919-2A > G allele variant frequency was ranged from 3.93% in Kunming to zero in Lincang and Nvjiang areas of Yunnan. We further detected the SLC26A4 c.2168 A > G variant in this cohort with one homozygotes (0.09%) and seven heterozygotes (0.60%), which was detected in Baoshan, Honghe, Licang and Pu`er areas. Between Han Chinese group (0.94%) and ethnic minority group (0.47%), there was no statistical significance (P > 0.05). Three Han Chinese patients (0.26%) carried compound heterozygosity for c.919-2A > G and c.2168 A > G. CONCLUSION These data suggest that the variants in both SLC26A4 c.919-2A > G and c.2168 A > G were relatively less frequencies in this cohort compared to the average levels in most regions of China, as well as significantly lower than that in Han-Chinese patients. These results broadened Chinese population genetic information resources and provided more detailed information for regional genetic counselling for Yunnan.
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Affiliation(s)
- Yan-Qiong Li
- Center for Clinical Medicine Research (Yunnan Provincial Key Laboratory of Clinical Virology, 202205AG070053, L-2019003), The First People's Hospital of Yunnan Province (The Affiliated Hospital of Kunming University of Science and Technology/School of Medicine), Kunming, 650032, Yunnan, China
- Central Sterile Supply Department, The First People's Hospital of Yunnan Province, (The Affiliated Hospital of Kunming University of Science and Technology/School of Medicine), Kunming, 650032, Yunnan, China
| | - Heng Ma
- The Outpatient Department of Yanan Hospital Affiliated to Kunming Medical University, Kunming, 650051, Yunnan, China
| | - Qin-Yao Wang
- Center for Clinical Medicine Research (Yunnan Provincial Key Laboratory of Clinical Virology, 202205AG070053, L-2019003), The First People's Hospital of Yunnan Province (The Affiliated Hospital of Kunming University of Science and Technology/School of Medicine), Kunming, 650032, Yunnan, China
| | - De-Sheng Liu
- Center for Clinical Medicine Research (Yunnan Provincial Key Laboratory of Clinical Virology, 202205AG070053, L-2019003), The First People's Hospital of Yunnan Province (The Affiliated Hospital of Kunming University of Science and Technology/School of Medicine), Kunming, 650032, Yunnan, China
- The Emergency Department of Traditional Chinese Medicine Hospital of Sichuan Province, (The Affiliated Hospital of Chengdu University of Traditional Chinese Medicine), Chengdu, 610075, Sichuan, China
| | - Wei Wang
- Center for Clinical Medicine Research (Yunnan Provincial Key Laboratory of Clinical Virology, 202205AG070053, L-2019003), The First People's Hospital of Yunnan Province (The Affiliated Hospital of Kunming University of Science and Technology/School of Medicine), Kunming, 650032, Yunnan, China
| | - Shi-Xin Li
- Center for Clinical Medicine Research (Yunnan Provincial Key Laboratory of Clinical Virology, 202205AG070053, L-2019003), The First People's Hospital of Yunnan Province (The Affiliated Hospital of Kunming University of Science and Technology/School of Medicine), Kunming, 650032, Yunnan, China
| | - Rong-Xia Zuo
- Center for Clinical Medicine Research (Yunnan Provincial Key Laboratory of Clinical Virology, 202205AG070053, L-2019003), The First People's Hospital of Yunnan Province (The Affiliated Hospital of Kunming University of Science and Technology/School of Medicine), Kunming, 650032, Yunnan, China
| | - Tao Shen
- Center for Clinical Medicine Research (Yunnan Provincial Key Laboratory of Clinical Virology, 202205AG070053, L-2019003), The First People's Hospital of Yunnan Province (The Affiliated Hospital of Kunming University of Science and Technology/School of Medicine), Kunming, 650032, Yunnan, China
| | - Bao-Sheng Zhu
- Center of Genetic Diagnosis (Yunnan Provincial Key Laboratory for Birth Defects and Genetic Diseases), The First People's Hospital of Yunnan Province (The Affiliated Hospital of Kunming University of Science and Technology/School of Medicine), Kunming, 650032, Yunnan, China
| | - Ya-Lian Sa
- Center for Clinical Medicine Research (Yunnan Provincial Key Laboratory of Clinical Virology, 202205AG070053, L-2019003), The First People's Hospital of Yunnan Province (The Affiliated Hospital of Kunming University of Science and Technology/School of Medicine), Kunming, 650032, Yunnan, China.
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Yu K, Liu X, Yang B. The correlation between deafness progression and SLC26A4 mutations in enlarged vestibular aqueduct patients. Eur Arch Otorhinolaryngol 2024; 281:649-654. [PMID: 37477685 DOI: 10.1007/s00405-023-08123-5] [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: 05/02/2023] [Accepted: 07/04/2023] [Indexed: 07/22/2023]
Abstract
BACKGROUND The relationship between the hearing phenotype and the SLC26A4 mutation in enlarged vestibular aqueduct cases has not been fully elucidated. OBJECTIVES To detect SLC26A4 mutation in a group of cases with enlarged vestibular aqueduct who received cochlear implantation and to analyze the correlation between the SLC26A4 genotype and the progression of deafness. MATERIALS AND METHODS Twenty-nine enlarged vestibular aqueduct patients were selected. Using the Sanger sequence to analyze SLC26A4 gene mutations. The 29 cases were divided into group A (carrying the c.919-2A > G mutation) and group B (not carrying the c.919-2A > G mutation). The difference in the duration of deafness was analyzed between the two groups. RESULTS The detection rate of the c.1174A > T mutation in the postlingual deafness group was 37.5%, higher than that in the prelingual deafness group (0%). The difference in the duration of deafness between groups A and B was not statistically significant by the Mann-Whitney U test (p > 0.05). CONCLUSIONS The correlation between the SLC26A4 genotype and the duration of deafness in cases with enlarged vestibular aqueduct is not yet clear. However, the c.1174A > T mutation may be linked to delayed hearing loss and the progression of deafness may be relatively slow in some cases of c.919-2A > G mutation.
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Affiliation(s)
- Kejia Yu
- The Fourth Affiliated Hospital, International Institutes of Medicine, Zhejiang University School of Medicine, Yiwu, China
| | - Xiao Liu
- Department of Otorhinolaryngology, Second Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, China
| | - Beibei Yang
- Department of Otorhinolaryngology, Second Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou, China.
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Sakata A, Kashio A, Koyama M, Urata S, Koyama H, Yamasoba T. Hearing and Hearing Loss Progression in Patients with GJB2 Gene Mutations: A Long-Term Follow-Up. Int J Mol Sci 2023; 24:16763. [PMID: 38069086 PMCID: PMC10705933 DOI: 10.3390/ijms242316763] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2023] [Revised: 11/19/2023] [Accepted: 11/23/2023] [Indexed: 12/18/2023] Open
Abstract
We aimed to investigate whether the degree of hearing loss with GJB2 mutations could be predicted by distinguishing between truncating and non-truncating mutations and whether the genotype could predict the hearing loss level. Additionally, we examined the progression of hearing loss in individuals monitored for over 2 years for an average of 6.9 years. The proportion of truncating mutations was higher in patients with profound and severe hearing loss, but it was not accurate enough to predict the degree of hearing loss. Via genotype analysis, mutations of the p.Arg143Trp variants were associated with profound hearing loss, while mutations of the p.Leu79Cysfs*3 allele exhibited a wide range of hearing loss, suggesting that specific genotypes can predict the hearing loss level. Notably, there were only three cases of progression in four ears, all of which involved the p.Leu79Cysfs*3 mutation. Over the long-term follow-up, 4000 Hz was significant, and there was a trend of progression at 250 Hz, suggesting that close monitoring at these frequencies during follow-up may be crucial to confirm progression. The progression of hearing loss was observed in moderate or severe hearing loss cases at the time of the initial diagnosis, emphasizing that children with this level of hearing loss need regular follow-ups.
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Affiliation(s)
- Aki Sakata
- Department of Otolaryngology and Head and Neck Surgery, Graduate School of Medicine, The University of Tokyo, Tokyo 113-8654, Japan; (A.S.); (A.K.); (M.K.); (S.U.); (H.K.)
| | - Akinori Kashio
- Department of Otolaryngology and Head and Neck Surgery, Graduate School of Medicine, The University of Tokyo, Tokyo 113-8654, Japan; (A.S.); (A.K.); (M.K.); (S.U.); (H.K.)
| | - Misaki Koyama
- Department of Otolaryngology and Head and Neck Surgery, Graduate School of Medicine, The University of Tokyo, Tokyo 113-8654, Japan; (A.S.); (A.K.); (M.K.); (S.U.); (H.K.)
| | - Shinji Urata
- Department of Otolaryngology and Head and Neck Surgery, Graduate School of Medicine, The University of Tokyo, Tokyo 113-8654, Japan; (A.S.); (A.K.); (M.K.); (S.U.); (H.K.)
| | - Hajime Koyama
- Department of Otolaryngology and Head and Neck Surgery, Graduate School of Medicine, The University of Tokyo, Tokyo 113-8654, Japan; (A.S.); (A.K.); (M.K.); (S.U.); (H.K.)
| | - Tatsuya Yamasoba
- Department of Otolaryngology and Head and Neck Surgery, Graduate School of Medicine, The University of Tokyo, Tokyo 113-8654, Japan; (A.S.); (A.K.); (M.K.); (S.U.); (H.K.)
- Tokyo Teishin Hospital, Tokyo 102-0071, Japan
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Pshennikova VG, Teryutin FM, Cherdonova AM, Borisova TV, Solovyev AV, Romanov GP, Morozov IV, Bondar AA, Posukh OL, Fedorova SA, Barashkov NA. The GJB2 (Cx26) Gene Variants in Patients with Hearing Impairment in the Baikal Lake Region (Russia). Genes (Basel) 2023; 14:genes14051001. [PMID: 37239361 DOI: 10.3390/genes14051001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2023] [Revised: 04/22/2023] [Accepted: 04/25/2023] [Indexed: 05/28/2023] Open
Abstract
The GJB2 (Cx26) gene pathogenic variants are associated with autosomal recessive deafness type 1A (DFNB1A, OMIM #220290). Direct sequencing of the GJB2 gene among 165 hearing-impaired individuals living in the Baikal Lake region of Russia identified 14 allelic variants: pathogenic/likely pathogenic-nine variants, benign-three variants, unclassified-one variant, and one novel variant. The contribution of the GJB2 gene variants to the etiology of hearing impairment (HI) in the total sample of patients was 15.8% (26 out of 165) and significantly differed in patients of different ethnicity (5.1% in Buryat patients and 28.9% in Russian patients). In patients with DFNB1A (n = 26), HIs were congenital/early onset (92.3%), symmetric (88.5%), sensorineural (100.0%), and variable in severity (moderate-11.6%, severe-26.9% or profound-61.5%). The reconstruction of the SNP haplotypes with three frequent GJB2 pathogenic variants (c.-23+1G>A, c.35delG or c.235delC), in comparison with previously published data, supports a major role of the founder effect in the expansion of the c.-23+1G>A and c.35delG variants around the world. Comparative analysis of the haplotypes with c.235delC revealed one major haplotype G A C T (97.5%) in Eastern Asians (Chinese, Japanese and Korean patients) and two haplotypes, G A C T (71.4%) and G A C C (28.6%), in Northern Asians (Altaians, Buryats and Mongols). The variable structure of the c.235delC-haplotypes in Northern Asians requires more studies to expand our knowledge about the origin of this pathogenic variant.
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Affiliation(s)
- Vera G Pshennikova
- Laboratory of Molecular Genetics, Yakut Science Centre of Complex Medical Problems, Yaroslavskogo 6/3, 677019 Yakutsk, Russia
| | - Fedor M Teryutin
- Laboratory of Molecular Genetics, Yakut Science Centre of Complex Medical Problems, Yaroslavskogo 6/3, 677019 Yakutsk, Russia
| | - Alexandra M Cherdonova
- Laboratory of Molecular Biology, Institute of Natural Sciences, M.K. Ammosov North-Eastern Federal University, Kulakovskogo 46, 677010 Yakutsk, Russia
| | - Tuyara V Borisova
- Laboratory of Molecular Biology, Institute of Natural Sciences, M.K. Ammosov North-Eastern Federal University, Kulakovskogo 46, 677010 Yakutsk, Russia
| | - Aisen V Solovyev
- Laboratory of Molecular Biology, Institute of Natural Sciences, M.K. Ammosov North-Eastern Federal University, Kulakovskogo 46, 677010 Yakutsk, Russia
| | - Georgii P Romanov
- Laboratory of Molecular Biology, Institute of Natural Sciences, M.K. Ammosov North-Eastern Federal University, Kulakovskogo 46, 677010 Yakutsk, Russia
| | - Igor V Morozov
- Novosibirsk State University, 630090 Novosibirsk, Russia
- Institute of Chemical Biology and Fundamental Medicine, Siberian Branch of the Russian Academy of Sciences, 630090 Novosibirsk, Russia
| | - Alexander A Bondar
- Institute of Chemical Biology and Fundamental Medicine, Siberian Branch of the Russian Academy of Sciences, 630090 Novosibirsk, Russia
| | - Olga L Posukh
- Novosibirsk State University, 630090 Novosibirsk, Russia
- Federal Research Center Institute of Cytology and Genetics, Siberian Branch of the Russian Academy of Sciences, 630090 Novosibirsk, Russia
| | - Sardana A Fedorova
- Laboratory of Molecular Genetics, Yakut Science Centre of Complex Medical Problems, Yaroslavskogo 6/3, 677019 Yakutsk, Russia
- Laboratory of Molecular Biology, Institute of Natural Sciences, M.K. Ammosov North-Eastern Federal University, Kulakovskogo 46, 677010 Yakutsk, Russia
| | - Nikolay A Barashkov
- Laboratory of Molecular Genetics, Yakut Science Centre of Complex Medical Problems, Yaroslavskogo 6/3, 677019 Yakutsk, Russia
- Laboratory of Molecular Biology, Institute of Natural Sciences, M.K. Ammosov North-Eastern Federal University, Kulakovskogo 46, 677010 Yakutsk, Russia
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Danilchenko VY, Zytsar MV, Maslova EA, Orishchenko KE, Posukh OL. Insight into the Natural History of Pathogenic Variant c.919-2A>G in the SLC26A4 Gene Involved in Hearing Loss: The Evidence for Its Common Origin in Southern Siberia (Russia). Genes (Basel) 2023; 14:genes14040928. [PMID: 37107686 PMCID: PMC10137394 DOI: 10.3390/genes14040928] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2023] [Revised: 04/10/2023] [Accepted: 04/12/2023] [Indexed: 04/29/2023] Open
Abstract
Pathogenic variants in the SLC26A4 gene leading to nonsyndromic recessive deafness (DFNB4), or Pendred syndrome, are some of the most common causes of hearing loss worldwide. Earlier, we found a high proportion of SLC26A4-related hearing loss with prevailing pathogenic variant c.919-2A>G (69.3% among all mutated SLC26A4 alleles that have been identified) in Tuvinian patients belonging to the indigenous Turkic-speaking Siberian people living in the Tyva Republic (Southern Siberia, Russia), which implies a founder effect in the accumulation of c.919-2A>G in Tuvinians. To evaluate a possible common origin of c.919-2A>G, we genotyped polymorphic STR and SNP markers, intragenic and flanking SLC26A4, in patients homozygous for c.919-2A>G and in healthy controls. The common STR and SNP haplotypes carrying c.919-2A>G were revealed, which convincingly indicates the origin of c.919-2A>G from a single ancestor, supporting a crucial role of the founder effect in the c.919-2A>G prevalence in Tuvinians. Comparison analysis with previously published data revealed the identity of the small SNP haplotype (~4.5 kb) in Tuvinian and Han Chinese carriers of c.919-2A>G, which suggests their common origin from founder chromosomes. We assume that c.919-2A>G could have originated in the geographically close territories of China or Tuva and subsequently spread to other regions of Asia. In addition, the time intervals of the c.919-2A>G occurrence in Tuvinians were roughly estimated.
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Affiliation(s)
- Valeriia Yu Danilchenko
- Federal Research Center Institute of Cytology and Genetics, Siberian Branch of the Russian Academy of Sciences, 630090 Novosibirsk, Russia
- Novosibirsk State University, 630090 Novosibirsk, Russia
| | - Marina V Zytsar
- Federal Research Center Institute of Cytology and Genetics, Siberian Branch of the Russian Academy of Sciences, 630090 Novosibirsk, Russia
| | - Ekaterina A Maslova
- Federal Research Center Institute of Cytology and Genetics, Siberian Branch of the Russian Academy of Sciences, 630090 Novosibirsk, Russia
- Novosibirsk State University, 630090 Novosibirsk, Russia
| | - Konstantin E Orishchenko
- Federal Research Center Institute of Cytology and Genetics, Siberian Branch of the Russian Academy of Sciences, 630090 Novosibirsk, Russia
- Novosibirsk State University, 630090 Novosibirsk, Russia
| | - Olga L Posukh
- Federal Research Center Institute of Cytology and Genetics, Siberian Branch of the Russian Academy of Sciences, 630090 Novosibirsk, Russia
- Novosibirsk State University, 630090 Novosibirsk, Russia
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Aboagye ET, Adadey SM, Wonkam-Tingang E, Amenga-Etego L, Awandare GA, Wonkam A. Global Distribution of Founder Variants Associated with Non-Syndromic Hearing Impairment. Genes (Basel) 2023; 14:399. [PMID: 36833326 PMCID: PMC9957346 DOI: 10.3390/genes14020399] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2023] [Revised: 01/28/2023] [Accepted: 01/30/2023] [Indexed: 02/05/2023] Open
Abstract
The genetic etiology of non-syndromic hearing impairment (NSHI) is highly heterogeneous with over 124 distinct genes identified. The wide spectrum of implicated genes has challenged the implementation of molecular diagnosis with equal clinical validity in all settings. Differential frequencies of allelic variants in the most common NSHI causal gene, gap junction beta 2 (GJB2), has been described as stemming from the segregation of a founder variant and/or spontaneous germline variant hot spots. We aimed to systematically review the global distribution and provenance of founder variants associated with NSHI. The study protocol was registered on PROSPERO, the International Prospective Register of Systematic Reviews, with the registration number "CRD42020198573". Data from 52 reports, involving 27,959 study participants from 24 countries, reporting 56 founder pathogenic or likely pathogenic (P/LP) variants in 14 genes (GJB2, GJB6, GSDME, TMC1, TMIE, TMPRSS3, KCNQ4, PJVK, OTOF, EYA4, MYO15A, PDZD7, CLDN14, and CDH23), were reviewed. Varied number short tandem repeats (STRs) and single nucleotide polymorphisms (SNPs) were used for haplotype analysis to identify the shared ancestral informative markers in a linkage disequilibrium and variants' origins, age estimates, and common ancestry computations in the reviewed reports. Asia recorded the highest number of NSHI founder variants (85.7%; 48/56), with variants in all 14 genes, followed by Europe (16.1%; 9/56). GJB2 had the highest number of ethnic-specific P/LP founder variants. This review reports on the global distribution of NSHI founder variants and relates their evolution to population migration history, bottleneck events, and demographic changes in populations linked with the early evolution of deleterious founder alleles. International migration and regional and cultural intermarriage, coupled to rapid population growth, may have contributed to re-shaping the genetic architecture and structural dynamics of populations segregating these pathogenic founder variants. We have highlighted and showed the paucity of data on hearing impairment (HI) variants in Africa, establishing unexplored opportunities in genetic traits.
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Affiliation(s)
- Elvis Twumasi Aboagye
- West African Centre for Cell Biology of Infectious Pathogens (WACCBIP), University of Ghana, Accra LG Box 54, Ghana
- Division of Human Genetics, Faculty of Health Sciences, University of Cape Town, Cape Town 7925, South Africa
| | - Samuel Mawuli Adadey
- West African Centre for Cell Biology of Infectious Pathogens (WACCBIP), University of Ghana, Accra LG Box 54, Ghana
| | - Edmond Wonkam-Tingang
- Division of Human Genetics, Faculty of Health Sciences, University of Cape Town, Cape Town 7925, South Africa
| | - Lucas Amenga-Etego
- West African Centre for Cell Biology of Infectious Pathogens (WACCBIP), University of Ghana, Accra LG Box 54, Ghana
| | - Gordon A. Awandare
- West African Centre for Cell Biology of Infectious Pathogens (WACCBIP), University of Ghana, Accra LG Box 54, Ghana
| | - Ambroise Wonkam
- Division of Human Genetics, Faculty of Health Sciences, University of Cape Town, Cape Town 7925, South Africa
- McKusick-Nathans Institute and Department of Genetic Medicine, John Hopkins University School of Medicine, Baltimore, MD 21205, USA
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The Frequency of Common Deafness-Associated Variants Among 3,555,336 Newborns in China and 141,456 Individuals Across Seven Populations Worldwide. Ear Hear 2023; 44:232-241. [PMID: 36149380 DOI: 10.1097/aud.0000000000001274] [Citation(s) in RCA: 8] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
OBJECTIVES Genetic screening can benefit early detection and intervention for hearing loss. The frequency of common deafness-associated variants in general populations is highly important for genetic screening and genetic counseling tailored to different ethnic backgrounds. We aimed to analyze the frequency of common deafness-associated variants in a large population-based Chinese newborn cohort and to explore the population-specific features in diverse populations worldwide. DESIGN This population-based cohort study analyzed the frequency of common deafness-associated variants in 3,555,336 newborns in the Chinese Newborn Concurrent Hearing and Genetic Screening cohort. Participants were newborn infants born between January 2007 and September 2020. Limited genetic screening for 20 variants in 4 common deafness-associated genes and newborn hearing screening were offered concurrently to all newborns in the Chinese Newborn Concurrent Hearing and Genetic Screening cohort. Sequence information of 141,456 individuals was also analyzed from seven ethnic populations from the Genome Aggregation Database for 20 common deafness-related variants. Statistical analysis was performed using R. RESULTS A total of 3,555,326 Chinese neonates completed the Newborn Concurrent Hearing and Genetic Screening were included for analysis. We reported the distinct landscape of common deafness-associated variants in this large population-based cohort. We found that the carrier frequencies of GJB2 , SLC26A4 , GJB3 , and MT-RNR were 2.53%, 2.05%, 0.37%, and 0.25%, respectively. Furthermore, GJB2 c.235delC was the most common variant with an allele frequency of 0.99% in the Chinese newborn population. We also demonstrated nine East-Asia-enriched variants, one Ashkenazi Jewish-enriched variant, and one European/American-enriched variant for hearing loss. CONCLUSIONS We showed the distinct landscape of common deafness-associated variants in the Chinese newborn population and provided insights into population-specific features in diverse populations. These data can serve as a powerful resource for otolaryngologists and clinical geneticists to inform population-adjusted genetic screening programs for hearing loss.
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Riza AL, Alkhzouz C, Farcaș M, Pîrvu A, Miclea D, Mihuț G, Pleșea RM, Ștefan D, Drodar M, Lazăr C, Study OBOTHINT, Study OBOTFUSE, Ioana M, Popp R. Non-Syndromic Hearing Loss in a Romanian Population: Carrier Status and Frequent Variants in the GJB2 Gene. Genes (Basel) 2022; 14:69. [PMID: 36672810 PMCID: PMC9858611 DOI: 10.3390/genes14010069] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2022] [Revised: 12/16/2022] [Accepted: 12/22/2022] [Indexed: 12/28/2022] Open
Abstract
The genetic causes of autosomal recessive nonsyndromic hearing loss (ARNSHL) are heterogeneous and highly ethnic-specific. We describe GJB2 (connexin 26) variants and carrier frequencies as part of our study and summarize previously reported ones for the Romanian population. In total, 284 unrelated children with bilateral congenital NSHL were enrolled between 2009 and 2018 in northwestern Romania. A tiered diagnostic approach was used: all subjects were tested for c.35delG, c.71G>A and deletions in GJB6 (connexin 30) using PCR-based methods. Furthermore, 124 cases undiagnosed at this stage were analyzed by multiplex-ligation-dependent probe amplifications (MLPA), probe mix P163, and sequencing of GJB2 exon 2. Targeted allele-specific PCR/restriction fragment length polymorphism (RFLP) established definite ethio-pathogenical diagnosis for 72/284 (25.35%) of the cohort. Out of the 124 further analyzed, in 12 cases (9.67%), we found compound heterozygous point mutations in GJB2. We identified one case of deletion of exon 1 of the WFS1 (wolframin) gene. Carrier status evaluation used Illumina Infinium Global Screening Array (GSA) genotyping: the HINT cohort-416 individuals in northwest Romania, and the FUSE cohort-472 individuals in southwest Romania. GSA variants yielded a cumulated risk allele presence of 0.0284. A tiered diagnostic approach may be efficient in diagnosing ARNSHL. The summarized contributions to Romanian descriptive epidemiology of ARNSHL shows that pathogenic variants in the GJB2 gene are frequent among NSHL cases and have high carrier rates, especially for c.35delG and c.71G>A. These findings may serve in health strategy development.
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Affiliation(s)
- Anca-Lelia Riza
- Regional Centre of Medical Genetics Dolj, Emergency County Hospital Craiova, 200642 Craiova, Romania
- Laboratory of Human Genomics, University of Medicine and Pharmacy of Craiova, 200638 Craiova, Romania
| | - Camelia Alkhzouz
- First Pediatric Department, “Iuliu Hatieganu” University of Medicine and Pharmacy, 400012 Cluj-Napoca, Romania
- Clinical Emergency Hospital for Children, 400394 Cluj-Napoca, Romania
| | - Marius Farcaș
- Molecular Sciences Department, “Iuliu Hatieganu” University of Medicine and Pharmacy, 400012 Cluj-Napoca, Romania
| | - Andrei Pîrvu
- Regional Centre of Medical Genetics Dolj, Emergency County Hospital Craiova, 200642 Craiova, Romania
- Laboratory of Human Genomics, University of Medicine and Pharmacy of Craiova, 200638 Craiova, Romania
| | - Diana Miclea
- First Pediatric Department, “Iuliu Hatieganu” University of Medicine and Pharmacy, 400012 Cluj-Napoca, Romania
- Clinical Emergency Hospital for Children, 400394 Cluj-Napoca, Romania
| | - Gheorghe Mihuț
- ENT Department, Clinical Emergency Hospital for Children, 400394 Cluj-Napoca, Romania
| | - Răzvan-Mihail Pleșea
- Regional Centre of Medical Genetics Dolj, Emergency County Hospital Craiova, 200642 Craiova, Romania
- Laboratory of Human Genomics, University of Medicine and Pharmacy of Craiova, 200638 Craiova, Romania
| | - Delia Ștefan
- Molecular Sciences Department, “Iuliu Hatieganu” University of Medicine and Pharmacy, 400012 Cluj-Napoca, Romania
| | - Mihaela Drodar
- Laboratory of Human Genomics, University of Medicine and Pharmacy of Craiova, 200638 Craiova, Romania
| | - Călin Lazăr
- First Pediatric Department, “Iuliu Hatieganu” University of Medicine and Pharmacy, 400012 Cluj-Napoca, Romania
- Clinical Emergency Hospital for Children, 400394 Cluj-Napoca, Romania
| | | | | | - Mihai Ioana
- Regional Centre of Medical Genetics Dolj, Emergency County Hospital Craiova, 200642 Craiova, Romania
- Laboratory of Human Genomics, University of Medicine and Pharmacy of Craiova, 200638 Craiova, Romania
| | - Radu Popp
- Molecular Sciences Department, “Iuliu Hatieganu” University of Medicine and Pharmacy, 400012 Cluj-Napoca, Romania
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Analysis of SLC26A4, FOXI1, and KCNJ10 Gene Variants in Patients with Incomplete Partition of the Cochlea and Enlarged Vestibular Aqueduct (EVA) Anomalies. Int J Mol Sci 2022; 23:ijms232315372. [PMID: 36499699 PMCID: PMC9740095 DOI: 10.3390/ijms232315372] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2022] [Revised: 11/29/2022] [Accepted: 11/30/2022] [Indexed: 12/12/2022] Open
Abstract
Pathogenic variants in the SLC26A4, FOXI1, and KCNJ10 genes are associated with hearing loss (HL) and specific inner ear abnormalities (DFNB4). In the present study, phenotype analyses, including clinical data collection, computed tomography (CT), and audiometric examination, were performed on deaf individuals from the Sakha Republic of Russia (Eastern Siberia). In cases with cochleovestibular malformations, molecular genetic analysis of the coding regions of the SLC26A4, FOXI1, and KCNJ10 genes associated with DFNB4 was completed. In six of the 165 patients (3.6%), CT scans revealed an incomplete partition of the cochlea (IP-1 and IP-2), in isolation or combined with an enlarged vestibular aqueduct (EVA) anomaly. Sequencing of the SLC26A4, FOXI1, and KCNJ10 genes was performed in these six patients. In the SLC26A4 gene, we identified four variants, namely c.85G>C p.(Glu29Gln), c.757A>G p.(Ile253Val), c.2027T>A p.(Leu676Gln), and c.2089+1G>A (IVS18+1G>A), which are known as pathogenic, as well as c.441G>A p.(Met147Ile), reported previously as a variant with uncertain significance. Using the AlphaFold algorithm, we found in silico evidence of the pathogenicity of this variant. We did not find any causative variants in the FOXI1 and KCNJ10 genes, nor did we find any evidence of digenic inheritance associated with double heterozygosity for these genes with monoallelic SLC26A4 variants. The contribution of biallelic SLC26A4 variants in patients with IP-1, IP-2, IP-2+EVA, and isolated EVA was 66.7% (DFNB4 in three patients, Pendred syndrome in one patient). Seventy-five percent of SLC26A4-biallelic patients had severe or profound HL. The morphology of the inner ear anomalies demonstrated that, among SLC26A4-biallelic patients, all types of incomplete partition of the cochlea are possible, from IP-1 and IP-2, to a normal cochlea. However, the dominant type of anomaly was IP-2+EVA (50.0%). This finding is very important for cochlear implantation, since the IP-2 anomaly does not have an increased risk of “gushers” and recurrent meningitis.
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14
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Danilchenko VY, Zytsar MV, Maslova EA, Posukh OL. Selection of Diagnostically Significant Regions of the SLC26A4 Gene Involved in Hearing Loss. Int J Mol Sci 2022; 23:ijms232113453. [PMID: 36362242 PMCID: PMC9655724 DOI: 10.3390/ijms232113453] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2022] [Revised: 10/23/2022] [Accepted: 11/01/2022] [Indexed: 11/06/2022] Open
Abstract
Screening pathogenic variants in the SLC26A4 gene is an important part of molecular genetic testing for hearing loss (HL) since they are one of the common causes of hereditary HL in many populations. However, a large size of the SLC26A4 gene (20 coding exons) predetermines the difficulties of its complete mutational analysis, especially in large samples of patients. In addition, the regional or ethno-specific prevalence of SLC26A4 pathogenic variants has not yet been fully elucidated, except variants c.919-2A>G and c.2168A>G (p.His723Arg), which have been proven to be most common in Asian populations. We explored the distribution of currently known pathogenic and likely pathogenic (PLP) variants across the SLC26A4 gene sequence presented in the Deafness Variation Database for the selection of potential diagnostically important parts of this gene. As a result of this bioinformatic analysis, we found that molecular testing ten SLC26A4 exons (4, 6, 10, 11, 13−17 and 19) with flanking intronic regions can provide a diagnostic rate of 61.9% for all PLP variants in the SLC26A4 gene. The primary sequencing of these SLC26A4 regions may be applied as an initial effective diagnostic testing in samples of patients of unknown ethnicity or as a subsequent step after the targeted testing of already-known ethno- or region-specific pathogenic SLC26A4 variants.
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Affiliation(s)
- Valeriia Yu. Danilchenko
- Federal Research Center Institute of Cytology and Genetics, Siberian Branch of the Russian Academy of Sciences, 630090 Novosibirsk, Russia
- Novosibirsk State University, 630090 Novosibirsk, Russia
| | - Marina V. Zytsar
- Federal Research Center Institute of Cytology and Genetics, Siberian Branch of the Russian Academy of Sciences, 630090 Novosibirsk, Russia
| | - Ekaterina A. Maslova
- Federal Research Center Institute of Cytology and Genetics, Siberian Branch of the Russian Academy of Sciences, 630090 Novosibirsk, Russia
- Novosibirsk State University, 630090 Novosibirsk, Russia
| | - Olga L. Posukh
- Federal Research Center Institute of Cytology and Genetics, Siberian Branch of the Russian Academy of Sciences, 630090 Novosibirsk, Russia
- Novosibirsk State University, 630090 Novosibirsk, Russia
- Correspondence:
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Jiang Y, Huang S, Zhang Y, Fang N, Liu Q, Liu Y, Bai L, Han D, Dai P. Evolutionary origin of pathogenic GJB2 alleles in China. Clin Genet 2022; 102:305-313. [PMID: 35841299 DOI: 10.1111/cge.14191] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2022] [Revised: 07/12/2022] [Accepted: 07/13/2022] [Indexed: 11/28/2022]
Abstract
The frequency of the pathogenic allele of the autosomal recessive deafness gene GJB2 varies among different populations in the world, and accumulates to a sufficiently high frequency in certain population. The purpose of this study is to investigate the origin and evolution of GJB2 pathogenic alleles in Chinese deaf patients. Children with non-syndromic hearing loss, and their parents, from 295 families were recruited. Customized capture probes targeted at 943 SNPs related to GJB2 gene were designed for sequencing of genomic DNA in blood samples. Haplotypes carrying pathogenic allele were analyzed through linkage disequilibrium block building, ancestry tracing, and extended haplotype heterozygosity calculation. Two pathogenic GJB2 alleles, c.235delC (18.41%) and c.109G>A (15.57%), were observed in 867 donors. For c.235delC allele, 3 different core haplotypes with one major haplotype (97.32%) were found, and their core SNPs were 100% conserved. For c.109G>A allele, 6 different haplotypes with one major haplotype (93.28%) were found and the major c.109G>A allele evolved from a specific ancestral haplotype. Geographical origins of donors carrying GJB2 c.109G>A and c.235delC core haplotypes centered between Qinghai and Neimenggu. GJB2 c.235delC has long-range linkage disequilibrium. No positive selection signature was found for GJB2 c.235delC or c.109G>A in the studied population. In conclusion, we discovered a single origin of GJB2 c.235delC allele and multiple independent origins of GJB2 c.109G>A allele. Alternative to positive selection or multiple independent recurrent mutation event, population bottleneck effect might account for the observed high population frequency of these pathogenic alleles.
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Affiliation(s)
- Yi Jiang
- Department of Otolaryngology-Head and Neck Surgery, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China.,Ear Institute, Shanghai Jiao Tong University School of Medicine, Shanghai, China.,Shanghai Key Laboratory of Translational Medicine on Ear and Nose Diseases, Shanghai, China
| | - Shasha Huang
- Department of Otolaryngology, Head and Neck Surgery, Institute of Otolaryngology, Chinese PLA General Hospital, Beijing, China.,National Clinical Research Center for Otolaryngologic Diseases, Beijing, China.,Key Lab of Hearing Impairment Science of Ministry of Education, Beijing, China.,Key Lab of Hearing Impairment Prevention and Treatment of Beijing, Beijing, China
| | - Yi Zhang
- Euler Technology, Beijing, China
| | - Nan Fang
- Beijing Scisoon Biotechnology Co., Ltd, Beijing, China
| | - Qian Liu
- Beijing Scisoon Biotechnology Co., Ltd, Beijing, China
| | - Yunchao Liu
- Beijing Scisoon Biotechnology Co., Ltd, Beijing, China
| | - Ling Bai
- Beijing Scisoon Biotechnology Co., Ltd, Beijing, China
| | - Dongyi Han
- Department of Otolaryngology, Head and Neck Surgery, Institute of Otolaryngology, Chinese PLA General Hospital, Beijing, China.,National Clinical Research Center for Otolaryngologic Diseases, Beijing, China.,Key Lab of Hearing Impairment Science of Ministry of Education, Beijing, China.,Key Lab of Hearing Impairment Prevention and Treatment of Beijing, Beijing, China
| | - Pu Dai
- Department of Otolaryngology, Head and Neck Surgery, Institute of Otolaryngology, Chinese PLA General Hospital, Beijing, China.,National Clinical Research Center for Otolaryngologic Diseases, Beijing, China.,Key Lab of Hearing Impairment Science of Ministry of Education, Beijing, China.,Key Lab of Hearing Impairment Prevention and Treatment of Beijing, Beijing, China
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Keratitis-ichthyosis-deafness Syndrome with Heterozygous p.D50N in the GJB2 Gene in Two Serbian Adult Patients. Balkan J Med Genet 2022; 25:79-84. [PMID: 36880041 PMCID: PMC9985354 DOI: 10.2478/bjmg-2022-0014] [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] [Indexed: 03/06/2023] Open
Abstract
Purpose Keratitis-ichthyosis-deafness (KID) syndrome is a rare congenital ectodermal dysplastic syndrome presenting with keratitis, ichthyosis and sensorineural hearing loss. The most common causes of KID syndrome are heterozygous missense mutations in the GJB2 gene that codes for connexin 26. Case report During the ophthalmological examination, two adult females complained of recent worsening of visual acuity in both eyes. Anamnesis revealed that their eyes were red and irritated from early childhood onwards. Both of them had thickening and keratinisation of eyelid margins, lash loss, diffuse opacification of cornea and conjunctiva caused by keratinisation of eye surface, superficial and deep corneal vascularisation and corneal oedema. Partial sensorineural hearing loss and difficulties in speech were also noted along with typical ichthyosiform erythroderma. Genetic testing of the GJB2 gene revealed a heterozygous p.D50N mutation in both patients.Patients were treated with a combined topical corticosteroid and artificial tears therapy, with steroid therapy being intensified during the last month. The therapy increased the visual acuity by decreasing corneal oedema and by forming a more regular air-tear interface during the six months follow up. Subsequently, the disease progressed despite the continuation of the therapy. Conclusion This is the first report of Serbian patients with KID syndrome. Despite the administration of the combined topical corticosteroid and artificial tears therapy the disease is relentlessly progressive and therapeutic success of ophthalmological signs with local therapeutic modalities used so far had been disappointing.
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Usami SI, Isaka Y, Miyagawa M, Nishio SY. Variants in CDH23 cause a broad spectrum of hearing loss: from non-syndromic to syndromic hearing loss as well as from congenital to age-related hearing loss. Hum Genet 2022; 141:903-914. [PMID: 35020051 PMCID: PMC9034991 DOI: 10.1007/s00439-022-02431-2] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2021] [Accepted: 01/06/2022] [Indexed: 11/28/2022]
Abstract
Variants in the CDH23 gene are known to be responsible for both syndromic hearing loss (Usher syndrome type ID: USH1D) and non-syndromic hearing loss (DFNB12). Our series of studies demonstrated that CDH23 variants cause a broad range of phenotypes of non-syndromic hearing loss (DFNB12); from congenital profound hearing loss to late-onset high-frequency-involved progressive hearing loss. In this study, based on the genetic and clinical data from more than 10,000 patients, the mutational spectrum, clinical characteristics and genotype/phenotype correlations were evaluated. The present results reconfirmed that the variants in CDH23 are an important cause of non-syndromic sensorineural hearing loss. In addition, we showed that the mutational spectrum in the Japanese population, which is probably representative of the East Asian population in general, as well as frequent CDH23 variants that might be due to some founder effects. The present study demonstrated CDH23 variants cause a broad range of phenotypes, from non-syndromic to syndromic hearing loss as well as from congenital to age-related hearing loss. Genotype (variant combinations) and phenotype (association with retinal pigmentosa, onset age) are shown to be well correlated and are thought to be related to the residual function defined by the CDH23 variants.
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Affiliation(s)
- Shin-Ichi Usami
- Department of Hearing Implant Sciences, Shinshu University School of Medicine, 3-1-1 Asahi, Matsumoto, 390-8621, Japan.
| | - Yuichi Isaka
- Department of Hearing Implant Sciences, Shinshu University School of Medicine, 3-1-1 Asahi, Matsumoto, 390-8621, Japan
| | - Maiko Miyagawa
- Department of Hearing Implant Sciences, Shinshu University School of Medicine, 3-1-1 Asahi, Matsumoto, 390-8621, Japan
| | - Shin-Ya Nishio
- Department of Hearing Implant Sciences, Shinshu University School of Medicine, 3-1-1 Asahi, Matsumoto, 390-8621, Japan
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Fu Y, Huang S, Gao X, Han M, Wang G, Kang D, Yuan Y, Dai P. Analysis of the genotype–phenotype correlation of MYO15A variants in Chinese non-syndromic hearing loss patients. BMC Med Genomics 2022; 15:71. [PMID: 35346193 PMCID: PMC8962197 DOI: 10.1186/s12920-022-01201-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2021] [Accepted: 02/28/2022] [Indexed: 11/10/2022] Open
Abstract
Abstract
Background
Mutations in the MYO15A gene are a widely recognized cause of autosomal recessive non-syndromic sensorineural hearing loss (NSHL) globally. Here, we examined the role and the genotype–phenotype correlation of MYO15A variants in a cohort of Chinese NSHL cases.
Methods
Eighty-one cases with evidenced MYO15A variants from the 2263 Chinese NSHL cases, who underwent next-generation sequencing (NGS), were enrolled in the study. We investigated the association of MYO15A variants with the severity, progression and age of onset of hearing loss, as well as compared it to the previous reports in different nationalities. The cases were divided into groups according to the number of truncating variants: 2 truncating, 1 truncating and 1 non-truncating, 2 non-truncating variants, and compared the severity of HL among the groups.
Results
MYO15A accounted for 3.58% (81/2263) of all NSHL cases. We analyzed 81 MYO15A-related NSHL cases, 73 of whom were with congenital bilateral, symmetric or severe-to-profound hearing loss (HL), however, 2 of them had a postlingual, asymmetric, mild or moderate HL. There were 102 variants identified in all MYO15A structural domains, 76.47% (78/102) of whom were novel. The most common types of detected variants were missense (44/102, 43.14%), followed by frameshift (27/102, 26.47%), nonsense (14/102, 13.72%), splice site (10/102, 9.80%), in frame (4/102, 3.92%), non-coding (2/102, 1.96%) and synonymous (1/102, 0.98%). The most recurrent variant c.10245_10247delCTC was detected in 12 cases. We observed that the MYO15A variants, located in its N-terminal, motor and FERM domains, led to partial deafness with better residual hearing at low frequencies. There were 34 cases with biallelic truncating variants, 37 cases with monoallelic truncating variants, and 13 cases with biallelic non-truncating variants. The biallelic non-truncating variants group had the least number of cases (12/81), and most of them (10/12) were with profound NSHL.
Conclusions
MYO15A is a major gene responsible for NSHL in China. Cases with MYO15A variants mostly showed early-onset, symmetric, severe-to-profound hearing loss. This study is by far the largest focused on the evaluation of the genotype–phenotype correlations among the variants in the MYO15A gene and its implication in the outcome of NSHL. The biallelic non-truncating MYO15A variants commonly caused profound HL, and the cases with one or two truncating MYO15A variants tended to increase the risk of HL. Nevertheless, further investigations are needed to clarify the causes for the variable severities and progression rates of hearing loss and the detected MYO15A variants in these cases.
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Aboagye ET, Adadey SM, Esoh K, Jonas M, de Kock C, Amenga-Etego L, Awandare GA, Wonkam A. Age Estimate of GJB2-p.(Arg143Trp) Founder Variant in Hearing Impairment in Ghana, Suggests Multiple Independent Origins across Populations. BIOLOGY 2022; 11:476. [PMID: 35336849 PMCID: PMC8945073 DOI: 10.3390/biology11030476] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/23/2022] [Revised: 03/15/2022] [Accepted: 03/17/2022] [Indexed: 12/29/2022]
Abstract
Gap junction protein beta 2 (GJB2) (connexin 26) variants are commonly implicated in non-syndromic hearing impairment (NSHI). In Ghana, the GJB2 variant p.(Arg143Trp) is the largest contributor to NSHI and has a reported prevalence of 25.9% in affected multiplex families. To date, in the African continent, GJB2-p.(Arg143Trp) has only been reported in Ghana. Using whole-exome sequencing data from 32 individuals from 16 families segregating NSHI, and 38 unrelated hearing controls with the same ethnolinguistic background, we investigated the date and origin of p.(Arg143Trp) in Ghana using linked markers. With a Bayesian linkage disequilibrium gene mapping method, we estimated GJB2-p.(Arg143Trp) to have originated about 9625 years (385 generations) ago in Ghana. A haplotype analysis comparing data extracted from Ghanaians and those from the 1000 Genomes project revealed that GJB2-p.(Arg143Trp) is carried on different haplotype backgrounds in Ghanaian and Japanese populations, as well as among populations of European ancestry, lending further support to the multiple independent origins of the variant. In addition, we found substantial haplotype conservation in the genetic background of Ghanaian individuals with biallelic GJB2-p.(Arg143Trp) compared to the GJB2-p.(Arg143Trp)-negative group with normal hearing from Ghana, suggesting a strong evolutionary constraint in this genomic region in Ghanaian populations that are homozygous for GJB2-p.(Arg143Trp). The present study evaluates the age of GJB2-p.(Arg143Trp) at 9625 years and supports the multiple independent origins of this variant in the global population.
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Affiliation(s)
- Elvis Twumasi Aboagye
- West African Centre for Cell Biology of Infectious Pathogens (WACCBIP), University of Ghana, Legon, Accra P.O. Box LG 54, Ghana; (E.T.A.); (S.M.A.); (L.A.-E.); (G.A.A.)
- Division of Human Genetics, Faculty of Health Sciences, University of Cape Town, Cape Town 7925, South Africa; (K.E.); (M.J.); (C.d.K.)
| | - Samuel Mawuli Adadey
- West African Centre for Cell Biology of Infectious Pathogens (WACCBIP), University of Ghana, Legon, Accra P.O. Box LG 54, Ghana; (E.T.A.); (S.M.A.); (L.A.-E.); (G.A.A.)
- Division of Human Genetics, Faculty of Health Sciences, University of Cape Town, Cape Town 7925, South Africa; (K.E.); (M.J.); (C.d.K.)
| | - Kevin Esoh
- Division of Human Genetics, Faculty of Health Sciences, University of Cape Town, Cape Town 7925, South Africa; (K.E.); (M.J.); (C.d.K.)
| | - Mario Jonas
- Division of Human Genetics, Faculty of Health Sciences, University of Cape Town, Cape Town 7925, South Africa; (K.E.); (M.J.); (C.d.K.)
| | - Carmen de Kock
- Division of Human Genetics, Faculty of Health Sciences, University of Cape Town, Cape Town 7925, South Africa; (K.E.); (M.J.); (C.d.K.)
| | - Lucas Amenga-Etego
- West African Centre for Cell Biology of Infectious Pathogens (WACCBIP), University of Ghana, Legon, Accra P.O. Box LG 54, Ghana; (E.T.A.); (S.M.A.); (L.A.-E.); (G.A.A.)
| | - Gordon A. Awandare
- West African Centre for Cell Biology of Infectious Pathogens (WACCBIP), University of Ghana, Legon, Accra P.O. Box LG 54, Ghana; (E.T.A.); (S.M.A.); (L.A.-E.); (G.A.A.)
| | - Ambroise Wonkam
- Division of Human Genetics, Faculty of Health Sciences, University of Cape Town, Cape Town 7925, South Africa; (K.E.); (M.J.); (C.d.K.)
- McKusick-Nathans Institute and Department of Genetic Medicine, John Hopkins University School of Medicine, Baltimore, MD 21205, USA
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Rapid Genetic Diagnosis for Okinawan Patients with Enlarged Vestibular Aqueduct Using Single-Stranded Tag Hybridization Chromatographic Printed-Array Strip. J Clin Med 2022; 11:jcm11041099. [PMID: 35207372 PMCID: PMC8880462 DOI: 10.3390/jcm11041099] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2022] [Revised: 02/11/2022] [Accepted: 02/17/2022] [Indexed: 02/04/2023] Open
Abstract
Both Pendred syndrome (PS) and nonsyndromic hearing loss with an enlarged vestibular aqueduct (EVA) are autosomal recessive disorders caused by SLC26A4 pathogenic variants. The spectrum of SLC26A4 pathogenic variants varies with the ethnic background. Among the patients with EVA in Okinawa, 94% had some combination of NM_000441.2(SLC26A4):c.1707+5G>A and NM_000441.2(SLC26A4):c.2168A>G(p.His723Arg), the two SLC26A4 pathogenic variants that are the most common in this population. We identified these two pathogenic variants using a novel genotyping method that employed an allele-specific polymerase chain reaction (PCR) from a gDNA and single-stranded tag hybridization chromatographic printed-array strip (STH-PAS) in DNA samples obtained from 48 samples in Okinawa, including 34 patients with EVA and 14 carriers of c.1707+5G>A or c.2168A>G. In addition, whole blood and saliva samples were used for analysis in this genotyping method with direct PCR. The results of STH-PAS genotyping were consistent with those obtained using standard Sanger sequencing for all samples. The accuracy of the STH-PAS method is 100% under the optimized conditions. STH-PAS genotyping provided a diagnosis in 30 out of 34 patients (88%) in Okinawan patients with EVA in under 3 h. The turn-around time for STH-PAS genotyping used with direct PCR was 2 h as a result of the omission of the DNA extraction and purification steps. Using information about the ethnic distribution of pathogenic variants in the SLC26A4 gene, STH-PAS genotyping performs a rapid genetic diagnosis that is simple and has a considerably improved efficiency.
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Agent-Based Modeling of Autosomal Recessive Deafness 1A (DFNB1A) Prevalence with Regard to Intensity of Selection Pressure in Isolated Human Population. BIOLOGY 2022; 11:biology11020257. [PMID: 35205123 PMCID: PMC8869167 DOI: 10.3390/biology11020257] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/21/2021] [Revised: 01/28/2022] [Accepted: 02/03/2022] [Indexed: 01/09/2023]
Abstract
An increase in the prevalence of autosomal recessive deafness 1A (DFNB1A) in populations of European descent was shown to be promoted by assortative marriages among deaf people. Assortative marriages became possible with the widespread introduction of sign language, resulting in increased genetic fitness of deaf individuals and, thereby, relaxing selection against deafness. However, the effect of this phenomenon was not previously studied in populations with different genetic structures. We developed an agent-based computer model for the analysis of the spread of DFNB1A. Using this model, we tested the impact of different intensities of selection pressure against deafness in an isolated human population over 400 years. Modeling of the "purifying" selection pressure on deafness ("No deaf mating" scenario) resulted in a decrease in the proportion of deaf individuals and the pathogenic allele frequency. Modeling of the "relaxed" selection ("Assortative mating" scenario) resulted in an increase in the proportion of deaf individuals in the first four generations, which then quickly plateaued with a subsequent decline and a decrease in the pathogenic allele frequency. The results of neutral selection pressure modeling ("Random mating" scenario) showed no significant changes in the proportion of deaf individuals or the pathogenic allele frequency after 400 years.
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Azadegan-Dehkordi F, Koohiyan M, Hoseini M. An update on autosomal recessive hearing loss and loci involved in it. INDIAN JOURNAL OF OTOLOGY 2022. [DOI: 10.4103/indianjotol.indianjotol_115_21] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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Different Rates of the SLC26A4-Related Hearing Loss in Two Indigenous Peoples of Southern Siberia (Russia). Diagnostics (Basel) 2021; 11:diagnostics11122378. [PMID: 34943614 PMCID: PMC8699871 DOI: 10.3390/diagnostics11122378] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2021] [Revised: 12/13/2021] [Accepted: 12/13/2021] [Indexed: 12/14/2022] Open
Abstract
Hereditary hearing loss (HL) is known to be highly locus/allelic heterogeneous, and the prevalence of different HL forms significantly varies among populations worldwide. Investigation of region-specific landscapes of hereditary HL is important for local healthcare and medical genetic services. Mutations in the SLC26A4 gene leading to nonsyndromic recessive deafness (DFNB4) and Pendred syndrome are common genetic causes of hereditary HL, at least in some Asian populations. We present for the first time the results of a thorough analysis of the SLC26A4 gene by Sanger sequencing in the large cohorts of patients with HL of unknown etiology belonging to two neighboring indigenous Turkic-speaking Siberian peoples (Tuvinians and Altaians). A definite genetic diagnosis based on the presence of biallelic SLC26A4 mutations was established for 28.2% (62/220) of all enrolled Tuvinian patients vs. 4.3% (4/93) of Altaian patients. The rate of the SLC26A4-related HL in Tuvinian patients appeared to be one of the highest among populations worldwide. The SLC26A4 mutational spectrum was characterized by the presence of Asian-specific mutations c.919-2A>G and c.2027T>A (p.Leu676Gln), predominantly found in Tuvinian patients, and c.2168A>G (p.His723Arg), which was only detected in Altaian patients. In addition, a novel pathogenic variant c.1545T>G (p.Phe515Leu) was found with high frequency in Tuvinian patients. Overall, based on the findings of this study and our previous research, we were able to uncover the genetic causes of HL in 50.5% of Tuvinian patients and 34.5% of Altaian patients.
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Guo J, Ma X, Skidmore JM, Cimerman J, Prieskorn DM, Beyer LA, Swiderski DL, Dolan DF, Martin DM, Raphael Y. GJB2 gene therapy and conditional deletion reveal developmental stage-dependent effects on inner ear structure and function. MOLECULAR THERAPY-METHODS & CLINICAL DEVELOPMENT 2021; 23:319-333. [PMID: 34729379 PMCID: PMC8531464 DOI: 10.1016/j.omtm.2021.09.009] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/23/2021] [Accepted: 09/24/2021] [Indexed: 11/15/2022]
Abstract
Pathogenic variants in GJB2, the gene encoding connexin 26, are the most common cause of autosomal-recessive hereditary deafness. Despite this high prevalence, pathogenic mechanisms leading to GJB2-related deafness are not well understood, and cures are absent. Humans with GJB2-related deafness retain at least some auditory hair cells and neurons, and their deafness is usually stable. In contrast, mice with conditional loss of Gjb2 in supporting cells exhibit extensive loss of hair cells and neurons and rapidly progress to profound deafness, precluding the application of therapies that require intact cochlear cells. In an attempt to design a less severe Gjb2 animal model, we generated mice with inducible Sox10iCre ERT2 -mediated loss of Gjb2. Tamoxifen injection led to reduced connexin 26 expression and impaired function, but cochlear hair cells and neurons survived for 2 months, allowing phenotypic rescue attempts within this time. AAV-mediated gene transfer of GJB2 in mature mutant ears did not demonstrate threshold improvement and in some animals exacerbated hearing loss and resulted in hair cell loss. We conclude that Sox10iCre ERT2 ;Gjb2 flox/flox mice are valuable for studying the biology of connexin 26 in the cochlea. In particular, these mice may be useful for evaluating gene therapy vectors and development of therapies for GJB2-related deafness.
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Affiliation(s)
- Jingying Guo
- Kresge Hearing Research Institute, Otolaryngology, Head and Neck Surgery, Michigan Medicine, University of Michigan, Ann Arbor, MI, USA.,Department of Otolaryngology Head and Neck Surgery, Beijing Friendship Hospital, Capital Medical University, Beijing, China
| | - Xiaobo Ma
- Department of Otolaryngology Head and Neck Surgery, Beijing Tongren Hospital, Capital Medical University, Beijing, China
| | - Jennifer M Skidmore
- Department of Pediatrics, Michigan Medicine, University of Michigan, Ann Arbor, MI, USA
| | - Jelka Cimerman
- Department of Pediatrics, Michigan Medicine, University of Michigan, Ann Arbor, MI, USA
| | - Diane M Prieskorn
- Kresge Hearing Research Institute, Otolaryngology, Head and Neck Surgery, Michigan Medicine, University of Michigan, Ann Arbor, MI, USA
| | - Lisa A Beyer
- Kresge Hearing Research Institute, Otolaryngology, Head and Neck Surgery, Michigan Medicine, University of Michigan, Ann Arbor, MI, USA
| | - Donald L Swiderski
- Kresge Hearing Research Institute, Otolaryngology, Head and Neck Surgery, Michigan Medicine, University of Michigan, Ann Arbor, MI, USA
| | - David F Dolan
- Kresge Hearing Research Institute, Otolaryngology, Head and Neck Surgery, Michigan Medicine, University of Michigan, Ann Arbor, MI, USA
| | - Donna M Martin
- Department of Pediatrics, Michigan Medicine, University of Michigan, Ann Arbor, MI, USA.,Department of Human Genetics, Michigan Medicine, University of Michigan, Ann Arbor, MI, USA
| | - Yehoash Raphael
- Kresge Hearing Research Institute, Otolaryngology, Head and Neck Surgery, Michigan Medicine, University of Michigan, Ann Arbor, MI, USA
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A common founder effect of the splice site variant c.-23 + 1G > A in GJB2 gene causing autosomal recessive deafness 1A (DFNB1A) in Eurasia. Hum Genet 2021; 141:697-707. [PMID: 34839402 DOI: 10.1007/s00439-021-02405-w] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2021] [Accepted: 11/21/2021] [Indexed: 10/19/2022]
Abstract
Mutations in the GJB2 gene are known to be a major cause of autosomal recessive deafness 1A (OMIM 220290). The most common pathogenic variants of the GJB2 gene have a high ethno-geographic specificity in their distribution, being attributed to a founder effect related to the Neolithic migration routes of Homo sapiens. The c.-23 + 1G > A splice site variant is frequently found among deaf patients of both Caucasian and Asian origins. It is currently unknown whether the spread of this mutation across Eurasia is a result of the founder effect or if it could have multiple local centers of origin. To determine the origin of c.-23 + 1G > A, we reconstructed haplotypes by genotyping SNPs on an Illumina OmniExpress 730 K platform of 23 deaf individuals homozygous for this variant from different populations of Eurasia. The analyses revealed the presence of common regions of homozygosity in different individual genomes in the sample. These data support the hypothesis of the common founder effect in the distribution of the c.-23 + 1G > A variant of the GJB2 gene. Based on the published data on the c.-23 + 1G > A prevalence among 16,177 deaf people and the calculation of the TMRCA of the modified f2-haplotypes carrying this variant, we reconstructed the potential migration routes of the carriers of this mutation around the world. This analysis indicates that the c.-23 + 1G > A variant in the GJB2 gene may have originated approximately 6000 years ago in the territory of the Caucasus or the Middle East then spread throughout Europe, South and Central Asia and other regions of the world.
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Lezirovitz K, Mingroni-Netto RC. Genetic etiology of non-syndromic hearing loss in Latin America. Hum Genet 2021; 141:539-581. [PMID: 34652575 DOI: 10.1007/s00439-021-02354-4] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2021] [Accepted: 08/23/2021] [Indexed: 12/16/2022]
Abstract
Latin America comprises all countries from South and Central America, in addition to Mexico. It is characterized by a complex mosaic of regions with heterogeneous genetic profiles regarding the geographical origin of the ancestors and proportions of admixture between the Native American, European and African components. In the first years following the findings of the role of the GJB2/GJB6 genes in the etiology of hearing loss, most scientific investigations about the genetics of hearing loss in Latin America focused on assessing the frequencies of pathogenic variants in these genes. More recently, modern techniques allowed researchers in Latin America to make exciting contributions to the finding of new candidate genes, novel mechanisms of inheritance in previously known genes, and characterize a wide diversity of variants, many of them unique to Latin America. This review aimed to provide a general landscape of the genetic studies about non-syndromic hearing loss in Latin America and their main scientific contributions. It allows the conclusion that, although there are similar contributions of some genes, such as GJB2/GJB6, when compared to European and North American countries, Latin American populations revealed some peculiarities that indicate the need for tailored strategies of screening and diagnosis to specific geographic regions.
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Affiliation(s)
- Karina Lezirovitz
- Laboratório de Otorrinolaringologia/LIM32, Faculdade de Medicina, Hospital das Clínicas, Universidade de São Paulo, São Paulo, SP, Brazil.
| | - Regina Célia Mingroni-Netto
- Departamento de Genética e Biologia Evolutiva, Centro de Pesquisas sobre o Genoma Humano e Células-Tronco, Instituto de Biociências, Universidade de São Paulo, São Paulo, Brazil
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27
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Yoshimura H, Nishio S, Usami S. Milestones toward cochlear gene therapy for patients with hereditary hearing loss. Laryngoscope Investig Otolaryngol 2021; 6:958-967. [PMID: 34693000 PMCID: PMC8513455 DOI: 10.1002/lio2.633] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2021] [Revised: 06/30/2021] [Accepted: 07/28/2021] [Indexed: 02/05/2023] Open
Abstract
A number of genes are reportedly responsible for hereditary hearing loss, which accounts for over 50% of all congenital hearing loss cases. Recent advances in genetic testing have enabled the identification of pathogenic variants in many cases, and systems have been developed to provide personalized treatment based on etiology. Gene therapy is expected to become an unprecedented curative treatment. Several reports have demonstrated the successful use of cochlear gene therapy to restore auditory function in mouse models of genetic deafness; however, many hurdles remain to its clinical application in humans. Herein, we focus on the frequency of deafness genes in patients with congenital and late-onset progressive hearing loss and discuss the following points regarding which genes need to be targeted to efficiently proceed with clinical application: (a) which cells' genes are expressed within the cochlea, (b) whether gene transfer to the targeted cells is possible using vectors such as adeno-associated virus, (c) what phenotype of hearing loss in patients is exhibited, and (d) whether mouse models exist to verify the effectiveness of treatment. Moreover, at the start of clinical application, gene therapy in combination with cochlear implantation may be useful for cases of progressive hearing loss.
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Affiliation(s)
- Hidekane Yoshimura
- Department of OtorhinolaryngologyShinshu University School of MedicineMatsumotoNaganoJapan
| | - Shin‐Ya Nishio
- Department of Hearing Implant SciencesShinshu University School of MedicineMatsumotoNaganoJapan
| | - Shin‐Ichi Usami
- Department of Hearing Implant SciencesShinshu University School of MedicineMatsumotoNaganoJapan
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28
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Usami SI, Nishio SY. The genetic etiology of hearing loss in Japan revealed by the social health insurance-based genetic testing of 10K patients. Hum Genet 2021; 141:665-681. [PMID: 34599366 PMCID: PMC9035015 DOI: 10.1007/s00439-021-02371-3] [Citation(s) in RCA: 22] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2021] [Accepted: 09/14/2021] [Indexed: 11/28/2022]
Abstract
Etiological studies have shown genetic disorders to be a major cause of sensorineural hearing loss, but there are a limited number of comprehensive etiological reports based on genetic analysis. In the present study, the same platform using a diagnostic DNA panel carrying 63 deafness genes and the same filtering algorithm were applied to 10,047 samples obtained from social health insurance-based genetic testing of hearing loss. The most remarkable result obtained in this comprehensive study was that the data first clarified the genetic epidemiology from congenital/early-onset deafness to late-onset hearing loss. The overall diagnostic rate was 38.8%, with the rate differing for each age group; 48.6% for the congenital/early-onset group (~5y.o.), 33.5% for the juvenile/young adult-onset group, and 18.0% for the 40+ y.o. group. Interestingly, each group showed a different kind of causative gene. With regard to the mutational spectra, there are certain recurrent variants that may be due to founder effects or hot spots. A series of haplotype studies have shown many recurrent variants are due to founder effects, which is compatible with human migration. It should be noted that, regardless of differences in the mutational spectrum, the clinical characteristics caused by particular genes can be considered universal. This comprehensive review clarified the detailed clinical characteristics (onset age, severity, progressiveness, etc.) of hearing loss caused by each gene, and will provide useful information for future clinical application, including genetic counseling and selection of appropriate interventions.
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Affiliation(s)
- Shin-Ichi Usami
- Department of Hearing Implant Sciences, Shinshu University School of Medicine, 3-1-1 Asahi, Matsumoto, 390-8621, Japan.
| | - Shin-Ya Nishio
- Department of Hearing Implant Sciences, Shinshu University School of Medicine, 3-1-1 Asahi, Matsumoto, 390-8621, Japan
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Zhu QW, Li MT, Zhuang X, Chen K, Xu WQ, Jiang YH, Qin G. Assessment of Hearing Screening Combined With Limited and Expanded Genetic Screening for Newborns in Nantong, China. JAMA Netw Open 2021; 4:e2125544. [PMID: 34533568 PMCID: PMC8449278 DOI: 10.1001/jamanetworkopen.2021.25544] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/28/2022] Open
Abstract
IMPORTANCE Early identification and intervention for newborns with hearing loss (HL) may lead to improved physiological and social-emotional outcomes. The current newborn hearing screening is generally beneficial but improvements can be made. OBJECTIVE To assess feasibility and evaluate utility of a modified genetic and hearing screening program for newborn infants. DESIGN, SETTING, AND PARTICIPANTS This population-based cohort study used a 4-stage genetic and hearing screening program at 6 local hospitals in Nantong city, China. Participants were newborn infants born between January 2016 and June 2020 from the Han population. Statistical analysis was performed from April 1 to May 1, 2021. EXPOSURES Limited genetic screening for 15 variants in 4 common HL-associated genes and newborn hearing screening (NHS) were offered concurrently to all newborns. Hearing rescreening and/or diagnostic tests were provided for infants with evidence of HL on NHS or genetic variants on screening. Expanded genetic tests for a broader range of genes were targeted to infants with HL with negative results of limited genetic tests. MAIN OUTCOMES AND MEASURES The detection capability for infants with hearing impairment who passed conventional hearing screening, as well as infants with normal hearing at risk of late-onset HL due to genetic susceptibility. RESULTS Among a total of 35 930 infants, 32 512 infants completed the follow-up and were included for analysis. Among the infants included in the analysis, all were from the Han population in China and 52.3% (16 988) were male. The modified genetic and hearing screening program revealed 142 cases of HL and 1299 cases of genetic variation. The limited genetic screening helped identify 31 infants who passed newborn hearing screening, reducing time for diagnosis and intervention; 425 infants with normal hearing with pathogenic SLC26A4 variation and 92 infants with MT-RNR1 variation were at risk for enlarged vestibular aqueduct and aminoglycoside-induced ototoxicity respectively, indicating early aversive or preventive management. CONCLUSIONS AND RELEVANCE This study found that performing modified genetic and hearing screening in newborns was feasible and provides evidence that the program could identify additional subgroups of infants who need early intervention. These findings suggest an advantage for universal adoption of such a practice.
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Affiliation(s)
- Qing-Wen Zhu
- Clinical Medicine Research Center, Nantong Maternal and Child Health Hospital affiliated to Nantong University, Nantong, China
| | - Mu-Ting Li
- Department of Epidemiology and Biostatistics, Nantong University School of Public Health, Nantong, China
| | - Xun Zhuang
- Department of Epidemiology and Biostatistics, Nantong University School of Public Health, Nantong, China
| | - Kai Chen
- Department of Internal Medicine, Nantong University Medical School, Nantong, China
| | - Wan-Qing Xu
- Department of Internal Medicine, Nantong University Medical School, Nantong, China
| | - Yin-Hua Jiang
- Clinical Medicine Research Center, Nantong Maternal and Child Health Hospital affiliated to Nantong University, Nantong, China
| | - Gang Qin
- Department of Epidemiology and Biostatistics, Nantong University School of Public Health, Nantong, China
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Guan J, Li J, Chen G, Shi T, Lan L, Wu X, Zhao C, Wang D, Wang H, Wang Q. Family trio-based sequencing in 404 sporadic bilateral hearing loss patients discovers recessive and De novo genetic variants in multiple ways. Eur J Med Genet 2021; 64:104311. [PMID: 34416374 DOI: 10.1016/j.ejmg.2021.104311] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2021] [Revised: 08/07/2021] [Accepted: 08/15/2021] [Indexed: 11/29/2022]
Abstract
Hereditary hearing loss (HL) has high genetic and phenotypical heterogeneity including the overlapping and variable phenotypic features. For sporadic HL without a family history, it is more difficult to indicate the contribution of genetic factors to define a pattern of inheritance. We assessed the contribution of genetic variants and patterns of inheritance by a family trio-based sequencing and provided new insight into genetics. We conducted an analysis of data from unrelated sporadic patients with HL (n = 404) who underwent trio-based whole-exome sequencing (trio-WES) or proband-only WES (p-WES) or targeted exome sequencing (TES), and the samples of their unaffected-parents (n = 808)were validated. A molecular diagnosis was rendered for 191 of 404 sporadic HL patients (47.3%) in multiple modes of inheritance, including autosomal recessive (AR), autosomal dominant (AD) caused by de novo variants, copy-number variants (CNVs), X-linked recessive, and dual genetic diagnosis. Among these patients, 83 (43.5%) cases were diagnosed with variants in rare genes. Sporadic HL patients were identified by multiple modes of transmission. Observed variations in rare genes and multiple modes of inheritance can strikingly emphasize the important etiological contribution of recessive and de novo genetic variants to a large cohort of sporadic HL cases plus their parents.
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Affiliation(s)
- Jing Guan
- College of Otolaryngology Head and Neck Surgery, Chinese PLA Institute of Otolaryngology, Chinese PLA General Hospital, Chinese PLA Medical School, 28 Fuxing Road, Beijing, 100853, China; National Clinical Research Center for Otolaryngologic Diseases, State Key Lab of Hearing Science, Ministry of Education, China & Beijing Key Lab of Hearing Impairment Prevention and Treatment, Beijing, 100853, China.
| | - Jin Li
- College of Otolaryngology Head and Neck Surgery, Chinese PLA Institute of Otolaryngology, Chinese PLA General Hospital, Chinese PLA Medical School, 28 Fuxing Road, Beijing, 100853, China; National Clinical Research Center for Otolaryngologic Diseases, State Key Lab of Hearing Science, Ministry of Education, China & Beijing Key Lab of Hearing Impairment Prevention and Treatment, Beijing, 100853, China.
| | - Guohui Chen
- College of Otolaryngology Head and Neck Surgery, Chinese PLA Institute of Otolaryngology, Chinese PLA General Hospital, Chinese PLA Medical School, 28 Fuxing Road, Beijing, 100853, China; National Clinical Research Center for Otolaryngologic Diseases, State Key Lab of Hearing Science, Ministry of Education, China & Beijing Key Lab of Hearing Impairment Prevention and Treatment, Beijing, 100853, China.
| | - Tao Shi
- College of Otolaryngology Head and Neck Surgery, Chinese PLA Institute of Otolaryngology, Chinese PLA General Hospital, Chinese PLA Medical School, 28 Fuxing Road, Beijing, 100853, China; National Clinical Research Center for Otolaryngologic Diseases, State Key Lab of Hearing Science, Ministry of Education, China & Beijing Key Lab of Hearing Impairment Prevention and Treatment, Beijing, 100853, China.
| | - Lan Lan
- College of Otolaryngology Head and Neck Surgery, Chinese PLA Institute of Otolaryngology, Chinese PLA General Hospital, Chinese PLA Medical School, 28 Fuxing Road, Beijing, 100853, China; National Clinical Research Center for Otolaryngologic Diseases, State Key Lab of Hearing Science, Ministry of Education, China & Beijing Key Lab of Hearing Impairment Prevention and Treatment, Beijing, 100853, China.
| | - Xiaonan Wu
- College of Otolaryngology Head and Neck Surgery, Chinese PLA Institute of Otolaryngology, Chinese PLA General Hospital, Chinese PLA Medical School, 28 Fuxing Road, Beijing, 100853, China; National Clinical Research Center for Otolaryngologic Diseases, State Key Lab of Hearing Science, Ministry of Education, China & Beijing Key Lab of Hearing Impairment Prevention and Treatment, Beijing, 100853, China.
| | - Cui Zhao
- College of Otolaryngology Head and Neck Surgery, Chinese PLA Institute of Otolaryngology, Chinese PLA General Hospital, Chinese PLA Medical School, 28 Fuxing Road, Beijing, 100853, China; National Clinical Research Center for Otolaryngologic Diseases, State Key Lab of Hearing Science, Ministry of Education, China & Beijing Key Lab of Hearing Impairment Prevention and Treatment, Beijing, 100853, China.
| | - Dayong Wang
- College of Otolaryngology Head and Neck Surgery, Chinese PLA Institute of Otolaryngology, Chinese PLA General Hospital, Chinese PLA Medical School, 28 Fuxing Road, Beijing, 100853, China; National Clinical Research Center for Otolaryngologic Diseases, State Key Lab of Hearing Science, Ministry of Education, China & Beijing Key Lab of Hearing Impairment Prevention and Treatment, Beijing, 100853, China.
| | - Hongyang Wang
- College of Otolaryngology Head and Neck Surgery, Chinese PLA Institute of Otolaryngology, Chinese PLA General Hospital, Chinese PLA Medical School, 28 Fuxing Road, Beijing, 100853, China; National Clinical Research Center for Otolaryngologic Diseases, State Key Lab of Hearing Science, Ministry of Education, China & Beijing Key Lab of Hearing Impairment Prevention and Treatment, Beijing, 100853, China.
| | - Qiuju Wang
- College of Otolaryngology Head and Neck Surgery, Chinese PLA Institute of Otolaryngology, Chinese PLA General Hospital, Chinese PLA Medical School, 28 Fuxing Road, Beijing, 100853, China; National Clinical Research Center for Otolaryngologic Diseases, State Key Lab of Hearing Science, Ministry of Education, China & Beijing Key Lab of Hearing Impairment Prevention and Treatment, Beijing, 100853, China.
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Fukunaga I, Oe Y, Danzaki K, Ohta S, Chen C, Shirai K, Kawano A, Ikeda K, Kamiya K. Modeling gap junction beta 2 gene-related deafness with human iPSC. Hum Mol Genet 2021; 30:1429-1442. [PMID: 33997905 DOI: 10.1093/hmg/ddab097] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2020] [Revised: 03/29/2021] [Accepted: 03/31/2021] [Indexed: 02/06/2023] Open
Abstract
There are >120 forms of non-syndromic deafness associated with identified genetic loci. In particular, mutation of the gap junction beta 2 gene (GJB2), which encodes connexin (CX)26 protein, is the most frequent cause of hereditary deafness worldwide. We previously described an induction method to develop functional CX26 gap junction-forming cells from mouse-induced pluripotent stem cells (iPSCs) and generated in vitro models for GJB2-related deafness. However, functional CX26 gap junction-forming cells derived from human iPSCs or embryonic stem cells (ESCs) have not yet been reported. In this study, we generated human iPSC-derived functional CX26 gap junction-forming cells (iCX26GJCs), which have the characteristics of cochlear supporting cells. These iCX26GJCs had gap junction plaque-like formations at cell-cell borders and co-expressed several markers that are expressed in cochlear supporting cells. Furthermore, we generated iCX26GJCs derived from iPSCs from two patients with the most common GJB2 mutation in Asia, and these cells reproduced the pathology of GJB2-related deafness. These in vitro models may be useful for establishing optimal therapies and drug screening for various mutations in GJB2-related deafness.
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Affiliation(s)
- Ichiro Fukunaga
- Department of Otorhinolaryngology, Juntendo University Faculty of Medicine, Tokyo 1138421, Japan
| | - Yoko Oe
- Department of Otorhinolaryngology, Juntendo University Faculty of Medicine, Tokyo 1138421, Japan
| | - Keiko Danzaki
- Department of Otorhinolaryngology, Juntendo University Faculty of Medicine, Tokyo 1138421, Japan
| | - Sayaka Ohta
- Department of Otorhinolaryngology, Juntendo University Faculty of Medicine, Tokyo 1138421, Japan
| | - Cheng Chen
- Department of Otorhinolaryngology, Juntendo University Faculty of Medicine, Tokyo 1138421, Japan
| | - Kyoko Shirai
- Department of Otolaryngology, Head and Neck Surgery, Tokyo Medical University, Tokyo 1600023, Japan
| | - Atsushi Kawano
- Department of Otolaryngology, Head and Neck Surgery, Tokyo Medical University, Tokyo 1600023, Japan
| | - Katsuhisa Ikeda
- Department of Otorhinolaryngology, Juntendo University Faculty of Medicine, Tokyo 1138421, Japan
| | - Kazusaku Kamiya
- Department of Otorhinolaryngology, Juntendo University Faculty of Medicine, Tokyo 1138421, Japan
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Safka Brozkova D, Uhrova Meszarosova A, Lassuthova P, Varga L, Staněk D, Borecká S, Laštůvková J, Čejnová V, Rašková D, Lhota F, Gašperíková D, Seeman P. The Cause of Hereditary Hearing Loss in GJB2 Heterozygotes-A Comprehensive Study of the GJB2/DFNB1 Region. Genes (Basel) 2021; 12:genes12050684. [PMID: 34062854 PMCID: PMC8147375 DOI: 10.3390/genes12050684] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2021] [Revised: 04/27/2021] [Accepted: 04/28/2021] [Indexed: 12/14/2022] Open
Abstract
Hearing loss is a genetically heterogeneous sensory defect, and the frequent causes are biallelic pathogenic variants in the GJB2 gene. However, patients carrying only one heterozygous pathogenic (monoallelic) GJB2 variant represent a long-lasting diagnostic problem. Interestingly, previous results showed that individuals with a heterozygous pathogenic GJB2 variant are two times more prevalent among those with hearing loss compared to normal-hearing individuals. This excess among patients led us to hypothesize that there could be another pathogenic variant in the GJB2 region/DFNB1 locus. A hitherto undiscovered variant could, in part, explain the cause of hearing loss in patients and would mean reclassifying them as patients with GJB2 biallelic pathogenic variants. In order to detect an unknown causal variant, we examined 28 patients using NGS with probes that continuously cover the 0.4 Mb in the DFNB1 region. An additional 49 patients were examined by WES to uncover only carriers. We did not reveal a second pathogenic variant in the DFNB1 region. However, in 19% of the WES-examined patients, the cause of hearing loss was found to be in genes other than the GJB2. We present evidence to show that a substantial number of patients are carriers of the GJB2 pathogenic variant, albeit only by chance.
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Affiliation(s)
- Dana Safka Brozkova
- Neurogenetic laboratory, Department of Paediatric Neurology, 2nd Faculty of Medicine, Charles University and University Hospital Motol, 15006 Prague, Czech Republic; (A.U.M.); (P.L.); (D.S.); (P.S.)
- Correspondence:
| | - Anna Uhrova Meszarosova
- Neurogenetic laboratory, Department of Paediatric Neurology, 2nd Faculty of Medicine, Charles University and University Hospital Motol, 15006 Prague, Czech Republic; (A.U.M.); (P.L.); (D.S.); (P.S.)
| | - Petra Lassuthova
- Neurogenetic laboratory, Department of Paediatric Neurology, 2nd Faculty of Medicine, Charles University and University Hospital Motol, 15006 Prague, Czech Republic; (A.U.M.); (P.L.); (D.S.); (P.S.)
| | - Lukáš Varga
- Department of Otorhinolaryngology–Head and Neck Surgery, Faculty of Medicine and University Hospital, Comenius University, 85107 Bratislava, Slovakia;
- Diabgene Laboratory, Institute of Experimental Endocrinology, Biomedical Research Center, Slovak Academy of Sciences, 84505 Bratislava, Slovakia; (S.B.); (D.G.)
| | - David Staněk
- Neurogenetic laboratory, Department of Paediatric Neurology, 2nd Faculty of Medicine, Charles University and University Hospital Motol, 15006 Prague, Czech Republic; (A.U.M.); (P.L.); (D.S.); (P.S.)
| | - Silvia Borecká
- Diabgene Laboratory, Institute of Experimental Endocrinology, Biomedical Research Center, Slovak Academy of Sciences, 84505 Bratislava, Slovakia; (S.B.); (D.G.)
| | - Jana Laštůvková
- Department of Medical Genetics, Masaryk Hospital in Usti nad Labem, Regional Health Corporation, 40011 Ústí nad Labem, Czech Republic; (J.L.); (V.Č.)
| | - Vlasta Čejnová
- Department of Medical Genetics, Masaryk Hospital in Usti nad Labem, Regional Health Corporation, 40011 Ústí nad Labem, Czech Republic; (J.L.); (V.Č.)
| | - Dagmar Rašková
- Centre for Medical Genetics and Reproductive Medicine GENNET, 17000 Prague, Czech Republic; (D.R.); (F.L.)
| | - Filip Lhota
- Centre for Medical Genetics and Reproductive Medicine GENNET, 17000 Prague, Czech Republic; (D.R.); (F.L.)
| | - Daniela Gašperíková
- Diabgene Laboratory, Institute of Experimental Endocrinology, Biomedical Research Center, Slovak Academy of Sciences, 84505 Bratislava, Slovakia; (S.B.); (D.G.)
| | - Pavel Seeman
- Neurogenetic laboratory, Department of Paediatric Neurology, 2nd Faculty of Medicine, Charles University and University Hospital Motol, 15006 Prague, Czech Republic; (A.U.M.); (P.L.); (D.S.); (P.S.)
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Faistauer M, Lang Silva A, Félix TM, Todeschini de Souza L, Bohn R, Selaimen da Costa S, Petersen Schmidt Rosito L. Etiology of early hearing loss in Brazilian children. Braz J Otorhinolaryngol 2021; 88 Suppl 1:S33-S41. [PMID: 33839059 PMCID: PMC9734262 DOI: 10.1016/j.bjorl.2021.02.012] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2020] [Revised: 01/22/2021] [Accepted: 02/28/2021] [Indexed: 12/16/2022] Open
Abstract
INTRODUCTION Hearing loss etiology depends on the population studied as well as on the ethnicity and the socio-economic condition of the analyzed region. Etiological diagnosis contributes to the improvement of preventive measures and to the early identification of this deficiency. OBJECTIVE To identify the etiological factors of hearing loss and its prevalence in a tertiary hospital in southern Brazil, to verify the frequency of mutations in GJB2 and GJB6 genes, and to correlate the degree of hearing loss with the etiological factors of deafness. METHODS This prevalence study involved 140 children with bilateral sensorineural or mixed hearing loss. Medical history, physical examination, audiometry, and evoked auditory brainstem response were conducted. Imaging and genetic examinations were also performed. RESULTS Etiologies and their prevalence were as follows: (a) indeterminate causes, 31.4%; (b) conditions related to neonatal period, 22.1%; (c) genetic, 22.1%; (d) auditory neuropathy, 10%; (e) other factors (cortical malformation, intracranial hemorrhage, and internal ear malformations), 7.9% and (f) congenital infections, 6.4%. Within the genetic cases, ten homozygous and seven heterozygotes of the 35delG mutation were identified, besides two cases of rare variants of GJB2: p.Try172* and p.Arg184Pro. One case with homozygosis of del(GJB6-D13S1830) was found. Regarding severity of hearing loss, in 78.6% of the cases the degree of hearing loss was profound and there were no significant differences when comparing between etiologies. CONCLUSION The number of indeterminate etiologies is still high and congenital CMV infection may be a possible cause of undiagnosed etiology for hearing loss. The predominance of etiologies related to neonatal conditions and infectious causes are characteristic of developing countries. The most prevalent mutation was 35delG, the main GJB2 gene, probably because of the European influence in the genotype of our population.
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Affiliation(s)
- Marina Faistauer
- Universidade Federal do Rio Grande do Sul, Faculdade de Medicina, Porto Alegre, RS, Brazil
| | - Alice Lang Silva
- Hospital de Clínicas de Porto Alegre, Departamento de Otorrinolaringologia e Cirurgia de Cabeça e Pescoço, Porto Alegre, RS, Brazil; Universidade Federal do Rio Grande do Sul, Faculdade de Medicina, Departamento de Oftalmologia e Otorrinolaringologia, Porto Alegre, RS, Brazil.
| | - Têmis Maria Félix
- Hospital de Clínicas de Porto Alegre, Departamento de Genética, Porto Alegre, RS, Brazil
| | | | - Renata Bohn
- Universidade Federal do Rio Grande do Sul, Faculdade de Medicina, Porto Alegre, RS, Brazil
| | - Sady Selaimen da Costa
- Hospital de Clínicas de Porto Alegre, Departamento de Otorrinolaringologia e Cirurgia de Cabeça e Pescoço, Porto Alegre, RS, Brazil; Universidade Federal do Rio Grande do Sul, Faculdade de Medicina, Departamento de Oftalmologia e Otorrinolaringologia, Porto Alegre, RS, Brazil
| | - Letícia Petersen Schmidt Rosito
- Hospital de Clínicas de Porto Alegre, Departamento de Otorrinolaringologia e Cirurgia de Cabeça e Pescoço, Porto Alegre, RS, Brazil; Universidade Federal do Rio Grande do Sul, Faculdade de Medicina, Departamento de Oftalmologia e Otorrinolaringologia, Porto Alegre, RS, Brazil
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Fukunaga I, Oe Y, Danzaki K, Ohta S, Chen C, Iizumi M, Shiga T, Matsuoka R, Anzai T, Hibiya-Motegi R, Tajima S, Ikeda K, Akamatsu W, Kamiya K. Generation of two iPSC lines from siblings of a homozygous patient with hearing loss and a heterozygous carrier with normal hearing carrying p.G45E/Y136X mutation in GJB2. Stem Cell Res 2021; 53:102290. [PMID: 33780732 DOI: 10.1016/j.scr.2021.102290] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/25/2021] [Accepted: 03/10/2021] [Indexed: 10/21/2022] Open
Abstract
The gap junction beta-2 (GJB2) gene is the most common genetic cause of hereditary deafness worldwide. Among them, the G45E/Y136X mutation in GJB2 is the third most prevalent in Japan. In this study, we generated two induced pluripotent stem cell (iPSC) lines from peripheral blood mononuclear cells (PBMCs) of siblings with moderate-to-severe hearing loss (patient) or normal hearing (genetic carrier) carrying a homozygous or heterozygous G45E/Y136X mutation in GJB2 gene, respectively. These iPSC lines showed the expression of pluripotency markers and could differentiate into three germ layers. These disease-specific iPSC lines will be a powerful tool for investigating the pathogenesis of GJB2-related deafness.
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Affiliation(s)
- Ichiro Fukunaga
- Department of Otorhinolaryngology, Juntendo University Faculty of Medicine, Tokyo, Japan
| | - Yoko Oe
- Department of Otorhinolaryngology, Juntendo University Faculty of Medicine, Tokyo, Japan
| | - Keiko Danzaki
- Department of Otorhinolaryngology, Juntendo University Faculty of Medicine, Tokyo, Japan
| | - Sayaka Ohta
- Department of Otorhinolaryngology, Juntendo University Faculty of Medicine, Tokyo, Japan
| | - Cheng Chen
- Department of Otorhinolaryngology, Juntendo University Faculty of Medicine, Tokyo, Japan
| | - Madoka Iizumi
- Department of Otorhinolaryngology, Juntendo University Faculty of Medicine, Tokyo, Japan
| | - Takahiro Shiga
- Center for Genomic and Regenerative Medicine, Juntendo University School of Medicine, Tokyo, Japan
| | - Rina Matsuoka
- Department of Otorhinolaryngology, Juntendo University Faculty of Medicine, Tokyo, Japan
| | - Takashi Anzai
- Department of Otorhinolaryngology, Juntendo University Faculty of Medicine, Tokyo, Japan
| | - Remi Hibiya-Motegi
- Department of Otorhinolaryngology, Juntendo University Faculty of Medicine, Tokyo, Japan
| | - Shori Tajima
- Department of Otorhinolaryngology, Juntendo University Faculty of Medicine, Tokyo, Japan
| | - Katsuhisa Ikeda
- Department of Otorhinolaryngology, Juntendo University Faculty of Medicine, Tokyo, Japan
| | - Wado Akamatsu
- Center for Genomic and Regenerative Medicine, Juntendo University School of Medicine, Tokyo, Japan
| | - Kazusaku Kamiya
- Department of Otorhinolaryngology, Juntendo University Faculty of Medicine, Tokyo, Japan.
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Li Y, Su J, Zhang J, Pei J, Li D, Zhang Y, Li J, Chen M, Zhu B. Targeted next-generation sequencing of deaf patients from Southwestern China. Mol Genet Genomic Med 2021; 9:e1660. [PMID: 33724713 PMCID: PMC8123756 DOI: 10.1002/mgg3.1660] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2020] [Revised: 02/23/2021] [Accepted: 02/24/2021] [Indexed: 11/06/2022] Open
Abstract
BACKGROUND Targeted next-generation sequencing is an efficient tool to identify pathogenic mutations of hereditary deafness. The molecular pathology of deaf patients in southwestern China is not fully understood. METHODS In this study, targeted next-generation sequencing of 127 deafness genes was performed on 84 deaf patients. They were not caused by common mutations of GJB2 gene, including c.35delG, c.109 G>A, c.167delT, c.176_191del16, c.235delC and c.299_300delAT. RESULTS In the cohorts of 84 deaf patients, we did not find any candidate pathogenic variants in 14 deaf patients (16.7%, 14/84). In other 70 deaf patients (83.3%, 70/84), candidate pathogenic variants were identified in 34 genes. Of these 70 deaf patients, the percentage of "Solved" and "Unsolved" patients was 51.43% (36/70) and 48.57% (34/70), respectively. The most common causative genes were SLC26A4 (12.9%, 9/70), MT-RNR1 (11.4%, 8/70), and MYO7A (2.9%, 2/70) in deaf patients. In "Unsolved" patients, possible pathogenic variants were most found in SLC26A4 (8.9%, 3/34), MYO7A (5.9%, 2/34), OTOF (5.9%, 2/34), and PDZD7 (5.9%, 2/34) genes. Interesting, several novel recessive pathogenic variants were identified, like SLC26A4 c.290T>G, SLC26A4 c.599A>G, PDZD7c.490 C>T, etc. CONCLUSION: In addition to common deafness genes, like GJB2, SLC26A4, and MT-RNR1 genes, other deafness genes (MYO7A, OTOF, PDZD7, etc.) were identified in deaf patients from southwestern China. Therefore, the spectrum of deafness genes in this area should be further studied.
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Affiliation(s)
- Yunlong Li
- Department of Medical Genetics, First People's Hospital of Yunnan Province, Kunming, Yunnan, China.,Affiliated Hospital of Kunming University of Science and Technology, Kunming, Yunnan, China
| | - Jie Su
- Department of Medical Genetics, First People's Hospital of Yunnan Province, Kunming, Yunnan, China
| | - Jingman Zhang
- Department of Medical Genetics, First People's Hospital of Yunnan Province, Kunming, Yunnan, China
| | - Jiahong Pei
- Department of Medical Genetics, First People's Hospital of Yunnan Province, Kunming, Yunnan, China
| | - Dongmei Li
- Department of Medical Genetics, First People's Hospital of Yunnan Province, Kunming, Yunnan, China
| | - Yinhong Zhang
- Department of Medical Genetics, First People's Hospital of Yunnan Province, Kunming, Yunnan, China
| | - Jingyu Li
- Department of Medical Genetics, First People's Hospital of Yunnan Province, Kunming, Yunnan, China.,Affiliated Hospital of Kunming University of Science and Technology, Kunming, Yunnan, China
| | - Menglang Chen
- Department of Medical Genetics, First People's Hospital of Yunnan Province, Kunming, Yunnan, China.,Affiliated Hospital of Kunming University of Science and Technology, Kunming, Yunnan, China
| | - Baosheng Zhu
- Department of Medical Genetics, First People's Hospital of Yunnan Province, Kunming, Yunnan, China.,Affiliated Hospital of Kunming University of Science and Technology, Kunming, Yunnan, China
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Hu CJ, Lu YC, Yang TH, Chan YH, Tsai CY, Yu IS, Lin SW, Liu TC, Cheng YF, Wu CC, Hsu CJ. Toward the Pathogenicity of the SLC26A4 p.C565Y Variant Using a Genetically Driven Mouse Model. Int J Mol Sci 2021; 22:2789. [PMID: 33801843 PMCID: PMC8001573 DOI: 10.3390/ijms22062789] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2021] [Revised: 03/05/2021] [Accepted: 03/05/2021] [Indexed: 11/19/2022] Open
Abstract
Recessive variants of the SLC26A4 gene are globally a common cause of hearing impairment. In the past, cell lines and transgenic mice were widely used to investigate the pathogenicity associated with SLC26A4 variants. However, discrepancies in pathogenicity between humans and cell lines or transgenic mice were documented for some SLC26A4 variants. For instance, the p.C565Y variant, which was reported to be pathogenic in humans, did not exhibit functional pathogenic consequences in cell lines. To address the pathogenicity of p.C565Y, we used a genotype-based approach in which we generated knock-in mice that were heterozygous (Slc26a4+/C565Y), homozygous (Slc26a4C565Y/C565Y), and compound heterozygous (Slc26a4919-2A>G/C565Y) for this variant. Subsequent phenotypic characterization revealed that mice with these genotypes demonstrated normal auditory and vestibular functions, and normal inner-ear morphology and pendrin expression. These findings indicate that the p.C565Y variant is nonpathogenic for mice, and that a single p.C565Y allele is sufficient to maintain normal inner-ear physiology in mice. Our results highlight the differences in pathogenicity associated with certain SLC26A4 variants between transgenic mice and humans, which should be considered when interpreting the results of animal studies for SLC26A4-related deafness.
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Affiliation(s)
- Chin-Ju Hu
- Department of Otolaryngology, National Taiwan University Hospital, Taipei 100, Taiwan; (C.-J.H.); (Y.-C.L.); (T.-H.Y.); (Y.-H.C.); (C.-Y.T.); (T.-C.L.); (C.-J.H.)
- Program in Speech and Hearing Bioscience and Technology, Harvard Medical School, Boston, MA 02115, USA
| | - Ying-Chang Lu
- Department of Otolaryngology, National Taiwan University Hospital, Taipei 100, Taiwan; (C.-J.H.); (Y.-C.L.); (T.-H.Y.); (Y.-H.C.); (C.-Y.T.); (T.-C.L.); (C.-J.H.)
- Department of Medical Research, Taipei Veteran General Hospital, Taipei 112, Taiwan
| | - Ting-Hua Yang
- Department of Otolaryngology, National Taiwan University Hospital, Taipei 100, Taiwan; (C.-J.H.); (Y.-C.L.); (T.-H.Y.); (Y.-H.C.); (C.-Y.T.); (T.-C.L.); (C.-J.H.)
| | - Yen-Hui Chan
- Department of Otolaryngology, National Taiwan University Hospital, Taipei 100, Taiwan; (C.-J.H.); (Y.-C.L.); (T.-H.Y.); (Y.-H.C.); (C.-Y.T.); (T.-C.L.); (C.-J.H.)
- Department of Otolaryngology, Taichung Tzu Chi Hospital, Buddhist Tzu Chi Medical Foundation, Taichung 427, Taiwan
| | - Cheng-Yu Tsai
- Department of Otolaryngology, National Taiwan University Hospital, Taipei 100, Taiwan; (C.-J.H.); (Y.-C.L.); (T.-H.Y.); (Y.-H.C.); (C.-Y.T.); (T.-C.L.); (C.-J.H.)
| | - I-Shing Yu
- Transgenic Mouse Models Core (TMMC), Division of Genomic Medicine, Research Center for Medical Excellence, National Taiwan University, Taipei 100, Taiwan; (I-S.Y.); (S.-W.L.)
| | - Shu-Wha Lin
- Transgenic Mouse Models Core (TMMC), Division of Genomic Medicine, Research Center for Medical Excellence, National Taiwan University, Taipei 100, Taiwan; (I-S.Y.); (S.-W.L.)
| | - Tien-Chen Liu
- Department of Otolaryngology, National Taiwan University Hospital, Taipei 100, Taiwan; (C.-J.H.); (Y.-C.L.); (T.-H.Y.); (Y.-H.C.); (C.-Y.T.); (T.-C.L.); (C.-J.H.)
| | - Yen-Fu Cheng
- Department of Medical Research, Taipei Veteran General Hospital, Taipei 112, Taiwan
- Department of Otolaryngology-Head and Neck Surgery, Taipei Veteran General Hospital, Taipei 112, Taiwan
- Faculty of Medicine, National Yang Ming Chiao Tung University, Taipei 112, Taiwan
- Institute of Brain Science, National Yang Ming Chiao Tung University, Taipei 112, Taiwan
| | - Chen-Chi Wu
- Department of Otolaryngology, National Taiwan University Hospital, Taipei 100, Taiwan; (C.-J.H.); (Y.-C.L.); (T.-H.Y.); (Y.-H.C.); (C.-Y.T.); (T.-C.L.); (C.-J.H.)
- Department of Medical Genetics, National Taiwan University Hospital, Taipei 100, Taiwan
- Department of Otolaryngology, College of Medicine, National Taiwan University, Taipei 100, Taiwan
| | - Chuan-Jen Hsu
- Department of Otolaryngology, National Taiwan University Hospital, Taipei 100, Taiwan; (C.-J.H.); (Y.-C.L.); (T.-H.Y.); (Y.-H.C.); (C.-Y.T.); (T.-C.L.); (C.-J.H.)
- Department of Otolaryngology, Taichung Tzu Chi Hospital, Buddhist Tzu Chi Medical Foundation, Taichung 427, Taiwan
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Wang J, Xiang J, Chen L, Luo H, Xu X, Li N, Cui C, Xu J, Song N, Peng J, Peng Z. Molecular diagnosis of non-syndromic hearing loss patients using a stepwise approach. Sci Rep 2021; 11:4036. [PMID: 33597575 PMCID: PMC7889619 DOI: 10.1038/s41598-021-83493-6] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2020] [Accepted: 01/25/2021] [Indexed: 12/13/2022] Open
Abstract
Hearing loss is one of the most common birth disorders in humans, with an estimated prevalence of 1–3 in every 1000 newborns. This study investigates the molecular etiology of a hearing loss cohort using a stepwise strategy to effectively diagnose patients and address the challenges posed by the genetic heterogeneity and variable mutation spectrum of hearing loss. In order to target known pathogenic variants, multiplex PCR plus next-generation sequencing was applied in the first step; patients which did not receive a diagnosis from this were further referred for exome sequencing. A total of 92 unrelated patients with nonsyndromic hearing loss were enrolled in the study. In total, 64% (59/92) of the patients were molecularly diagnosed, 44 of them in the first step by multiplex PCR plus sequencing. Exome sequencing resulted in eleven diagnoses (23%, 11/48) and four probable diagnoses (8%, 4/48) among the 48 patients who were not diagnosed in the first step. The rate of secondary findings from exome sequencing in our cohort was 3% (2/58). This research presents a molecular diagnosis spectrum of 92 non-syndromic hearing loss patients and demonstrates the benefits of using a stepwise diagnostic approach in the genetic testing of nonsyndromic hearing loss.
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Affiliation(s)
- Jing Wang
- Department of Obstetrics and Gynecology, The First Affiliated Hospital of USTC, Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei, 230001, Anhui, China
| | - Jiale Xiang
- BGI Genomics, BGI-Shenzhen, Shenzhen, 518083, China.,BGI Education Center, University of Chinese Academy of Sciences, Shenzhen, 518083, China
| | - Lisha Chen
- BGI Genomics, BGI-Shenzhen, Shenzhen, 518083, China.,BGI Education Center, University of Chinese Academy of Sciences, Shenzhen, 518083, China
| | - Hongyu Luo
- BGI Genomics, BGI-Shenzhen, Shenzhen, 518083, China
| | - Xiuhua Xu
- Dalian Municipal Women and Children's Medical Center, Dalian, 116037, China
| | - Nan Li
- Dalian Municipal Women and Children's Medical Center, Dalian, 116037, China
| | - Chunming Cui
- Dalian Municipal Women and Children's Medical Center, Dalian, 116037, China
| | - Jingjing Xu
- Department of Obstetrics and Gynecology, The First Affiliated Hospital of USTC, Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei, 230001, Anhui, China
| | - Nana Song
- BGI Genomics, BGI-Shenzhen, Shenzhen, 518083, China
| | - Jiguang Peng
- BGI Genomics, BGI-Shenzhen, Shenzhen, 518083, China
| | - Zhiyu Peng
- BGI Genomics, BGI-Shenzhen, Shenzhen, 518083, China.
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Koohiyan M, Hashemzadeh-Chaleshtori M, Tabatabaiefar MA. Molecular diagnosis of SLC26A4-related hereditary hearing loss in a group of patients from two provinces of Iran. Intractable Rare Dis Res 2021; 10:23-30. [PMID: 33614372 PMCID: PMC7882080 DOI: 10.5582/irdr.2020.03090] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
Abstract
The SLC26A4 gene has been described as the second gene involved in most cases of autosomal recessive non-syndromic hearing loss (ARNSHL), after GJB2. Over 500 different SLC26A4 mutations have been reported, with each ethnic population having its own distinctive mutations. Here, we aimed to determine the frequency and mutation profile of the SLC26A4 gene from two different provinces (center and west) of Iran. This study included 50 nuclear families with two or more siblings segregating presumed ARNSHL. All affected tested negative for mutations in GJB2 at the DFNB1 locus and were therefore screened for autozygosity by descent using short tandem repeat polymorphisms (STRPs) of DFNB4. Sanger sequencing was performed to screen the 20 exons of the SLC26A4 gene for the families linked to this locus. In silico analyses were also performed using available software tools. Four out of 25 (16%) and 3 of 25 (12%) studied families of Isfahan and Hamedan provinces, respectively. were linked to DFNB4. Sanger sequencing led to the identification of six different mutations, one of which (c.919-2A>G) was recurrent and accounted for 31% of all mutant alleles. One out of 7 (14.3%) families with mutations were confirmed to be Pendred syndrome (PS). The SLC26A4 mutations have a high carrying rate in ARNSHL Iranian patients. The identification of a disease causing mutation can be used to establish a genotypic diagnosis and provide important information to the patients and their families.
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Affiliation(s)
- Mahbobeh Koohiyan
- Department of Genetics and Molecular Biology, School of Medicine, Isfahan University of Medical Sciences, Isfahan, Iran
- Cancer Research Center, Shahrekord University of Medical Sciences, Shahrekord, Iran
| | - Morteza Hashemzadeh-Chaleshtori
- Cellular and Molecular Research Center, Basic Health Research Institute, Shahrekord University of Medical Sciences, Shahrekord, Iran
| | - Mohammad Amin Tabatabaiefar
- Department of Genetics and Molecular Biology, School of Medicine, Isfahan University of Medical Sciences, Isfahan, Iran
- Pediatric Inherited Diseases Research Center, Research Institute for Primordial Prevention of Noncommunicable Disease, Isfahan University of Medical Sciences, Isfahan, Iran
- Address correspondence to:Mohammad Amin Tabatabaiefar, Department of Genetics and Molecular Biology, School of Medicine, Isfahan University of Medical Sciences, Hezarjarib St., Isfahan 81746-7346, Iran. E-mail:
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Ding N, Lee S, Lieber-Kotz M, Yang J, Gao X. Advances in genome editing for genetic hearing loss. Adv Drug Deliv Rev 2021; 168:118-133. [PMID: 32387678 DOI: 10.1016/j.addr.2020.05.001] [Citation(s) in RCA: 22] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2019] [Revised: 04/27/2020] [Accepted: 05/04/2020] [Indexed: 02/07/2023]
Abstract
According to the World Health Organization, hearing loss affects over 466 million people worldwide and is the most common human sensory impairment. It is estimated that genetic factors contribute to the causation of approximately 50% of congenital hearing loss. Yet, curative approaches to reversing or preventing genetic hearing impairment are still limited. The clustered regularly interspaced short palindromic repeats-associated protein 9 (CRISPR-Cas9) systems enable programmable and targeted gene editing in highly versatile manners and offer new gene therapy strategies for genetic hearing loss. Here, we summarize the most common deafness-associated genes, illustrate recent strategies undertaken by using CRISPR-Cas9 systems for targeted gene editing and further compare the CRISPR strategies to non-CRISPR gene therapies. We also examine the merits of different vehicles and delivery forms of genome editing agents. Lastly, we describe the development of animal models that could facilitate the eventual clinical applications of the CRISPR technology to the treatment of genetic hearing diseases.
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40
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Tang X, Liu L, Liang S, Liang M, Liao T, Luo S, Yan T, Chen J. Concurrent Newborn Hearing and Genetic Screening in a Multi-Ethnic Population in South China. Front Pediatr 2021; 9:734300. [PMID: 34917556 PMCID: PMC8669824 DOI: 10.3389/fped.2021.734300] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/21/2021] [Accepted: 11/03/2021] [Indexed: 11/13/2022] Open
Abstract
Hearing loss is a common sensory deficit in humans with intricate genomic landscape and mutational signature. Approximately 1-3 out of 1,000 newborns have hearing loss and up to 60% of these cases have a genetic etiology. In this study, we conducted the concurrent newborn hearing and genetic screening in 20 mutations (18 pathogenic variants in GJB2, SLC26A4, and MT-RNR1 and 2 uncertain clinical significance variants in GJB3) for 9,506 normal newborns (4,977 [52.4%] males) from 22 ethnic population in South China. A total of 1,079 (11.4%) newborns failed to pass the initial hearing screening; 160 (1.7%) infants failed to pass the re-screening, and 135 (1.4%) infants presented the diagnostic hearing loss. For the genetic screening, 220 (2.3%) newborns who presented at least one of the screened mutations were more likely to fail the hearing screening and have diagnostic hearing loss than mutation-negative newborns. In comparison to the differences of distribution of mutations, we did not identify any significant difference in the prevalence of screened mutations between Han group (n = 5,265) and Zhuang group (n = 3,464), despite the lack of number of minority ethnic groups. Studies including larger number of minority ethnic populations are needed in the future.
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Affiliation(s)
- Xiangrong Tang
- Department of Otolaryngology-Head and Neck Surgery, Liuzhou Maternal and Child Health Care Hospital, Liuzhou, China
| | - Lihua Liu
- Department of Otolaryngology-Head and Neck Surgery, Liuzhou Maternal and Child Health Care Hospital, Liuzhou, China
| | - Sulan Liang
- Department of Otolaryngology-Head and Neck Surgery, Liuzhou Maternal and Child Health Care Hospital, Liuzhou, China
| | - Meie Liang
- Department of Otolaryngology-Head and Neck Surgery, Liuzhou Maternal and Child Health Care Hospital, Liuzhou, China
| | - Tao Liao
- Department of Obstetrics, Liuzhou Maternal and Child Health Care Hospital, Liuzhou, China
| | - Shiqiang Luo
- Department of Medical Genetics, Liuzhou Maternal and Child Health Care Hospital, Liuzhou, China
| | - Tizhen Yan
- Department of Medical Genetics, Liuzhou Maternal and Child Health Care Hospital, Liuzhou, China
| | - Jianping Chen
- Department of Children's Health Care, Liuzhou Maternal and Child Health Care Hospital, Liuzhou, China
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Roesch S, Bernardinelli E, Wortmann S, Mayr JA, Bader I, Schweighofer-Zwink G, Rasp G, Dossena S. [Molecular and functional testing in case of hereditary hearing loss associated with the SLC26A4 gene]. Laryngorhinootologie 2020; 99:853-862. [PMID: 33307573 DOI: 10.1055/a-1190-4173] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Abstract
Due to development of molecular techniques at hand, the number of genomic sequence variants detected in patient investigations is rising constantly. The number of potentially involved genes in hereditary hearing loss is rising simultaneously.In this overview, current methods for diagnostic workup on a molecular and functional level for variants of the SLC26A4 gene are described. Based on the description of the physiological function of the resulting protein Pendrin, molecular investigations for interpretation of the function are explained. Based on these investigations, the potential clinical consequences of a variant may be predicted more precisely and simplify routine reporting of a proven genotype and a phenotype, at hand. Finally, subsequent clinical investigations necessary, such as perchlorate discharge test, as well as therapeutic options are discussed.
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Affiliation(s)
- Sebastian Roesch
- Universitätsklinik für Hals-Nasen-Ohrenkrankheiten der Paracelsus Medizinischen Privatuniversität Salzburg, SALK, Salzburg, Austria
| | - Emanuele Bernardinelli
- Universitätsinstitut für Pharmakologie und Toxikologie der Paracelsus Medizinischen Privatuniversität Salzburg, Austria
| | - Saskia Wortmann
- Universitätsklinik für Kinder- und Jugendheilkunde der Paracelsus Medizinischen Privatuniversität Salzburg, SALK, Salzburg, Austria
| | - Johannes A Mayr
- Universitätsklinik für Kinder- und Jugendheilkunde der Paracelsus Medizinischen Privatuniversität Salzburg, SALK, Salzburg, Austria
| | - Ingrid Bader
- Division für klinische Genetik, Universitätsklinik für Kinder- und Jugendheilkunde der Paracelsus Medizinischen Privatuniversität Salzburg, SALK, Salzburg, Austria
| | - Gregor Schweighofer-Zwink
- Universitätsklinik für Nuklearmedizin und Endokrinologie der Paracelsus Medizinischen Privatuniversität Salzburg, SALK, Salzburg, Austria
| | - Gerd Rasp
- Universitätsklinik für Hals-Nasen-Ohrenkrankheiten der Paracelsus Medizinischen Privatuniversität Salzburg, SALK, Salzburg, Austria
| | - Silvia Dossena
- Universitätsinstitut für Pharmakologie und Toxikologie der Paracelsus Medizinischen Privatuniversität Salzburg, Austria
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Adadey SM, Wonkam-Tingang E, Twumasi Aboagye E, Nayo-Gyan DW, Boatemaa Ansong M, Quaye O, Awandare GA, Wonkam A. Connexin Genes Variants Associated with Non-Syndromic Hearing Impairment: A Systematic Review of the Global Burden. Life (Basel) 2020; 10:life10110258. [PMID: 33126609 PMCID: PMC7693846 DOI: 10.3390/life10110258] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2020] [Revised: 10/18/2020] [Accepted: 10/27/2020] [Indexed: 12/21/2022] Open
Abstract
Mutations in connexins are the most common causes of hearing impairment (HI) in many populations. Our aim was to review the global burden of pathogenic and likely pathogenic (PLP) variants in connexin genes associated with HI. We conducted a systematic review of the literature based on targeted inclusion/exclusion criteria of publications from 1997 to 2020. The databases used were PubMed, Scopus, Africa-Wide Information, and Web of Science. The protocol was registered on PROSPERO, the International Prospective Register of Systematic Reviews, with the registration number “CRD42020169697”. The data extracted were analyzed using Microsoft Excel and SPSS version 25 (IBM, Armonk, New York, United States). A total of 571 independent studies were retrieved and considered for data extraction with the majority of studies (47.8% (n = 289)) done in Asia. Targeted sequencing was found to be the most common technique used in investigating connexin gene mutations. We identified seven connexin genes that were associated with HI, and GJB2 (520/571 publications) was the most studied among the seven. Excluding PLP in GJB2, GJB6, and GJA1 the other connexin gene variants (thus GJB3, GJB4, GJC3, and GJC1 variants) had conflicting association with HI. Biallelic GJB2 PLP variants were the most common and widespread variants associated with non-syndromic hearing impairment (NSHI) in different global populations but absent in most African populations. The most common GJB2 alleles found to be predominant in specific populations include; p.Gly12ValfsTer2 in Europeans, North Africans, Brazilians, and Americans; p.V37I and p.L79Cfs in Asians; p.W24X in Indians; p.L56Rfs in Americans; and the founder mutation p.R143W in Africans from Ghana, or with putative Ghanaian ancestry. The present review suggests that only GJB2 and GJB3 are recognized and validated HI genes. The findings call for an extensive investigation of the other connexin genes in many populations to elucidate their contributions to HI, in order to improve gene-disease pair curations, globally.
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Affiliation(s)
- Samuel Mawuli Adadey
- West African Centre for Cell Biology of Infectious Pathogens (WACCBIP), University of Ghana, P.O. Box LG 54, Legon GA184, Accra, Greater Accra Region, Ghana; (S.M.A.); (O.Q.); (G.A.A.)
- Department of Biochemistry, Cell and Molecular Biology, University of Ghana, P.O. Box LG 54, Legon Accra GA184, Greater Accra Region, Ghana; (E.T.A.); (M.B.A.)
- Division of Human Genetics, Faculty of Health Sciences, University of Cape Town, Anzio Road, Observatory, Cape Town 7925, South Africa;
| | - Edmond Wonkam-Tingang
- Division of Human Genetics, Faculty of Health Sciences, University of Cape Town, Anzio Road, Observatory, Cape Town 7925, South Africa;
| | - Elvis Twumasi Aboagye
- Department of Biochemistry, Cell and Molecular Biology, University of Ghana, P.O. Box LG 54, Legon Accra GA184, Greater Accra Region, Ghana; (E.T.A.); (M.B.A.)
- Division of Human Genetics, Faculty of Health Sciences, University of Cape Town, Anzio Road, Observatory, Cape Town 7925, South Africa;
| | - Daniel Wonder Nayo-Gyan
- Department of Applied Chemistry and Biochemistry, C. K. Tedam University of Technology and Applied Sciences, P.O. Box 24, Navrongo 00000, Upper East Region, Ghana;
| | - Maame Boatemaa Ansong
- Department of Biochemistry, Cell and Molecular Biology, University of Ghana, P.O. Box LG 54, Legon Accra GA184, Greater Accra Region, Ghana; (E.T.A.); (M.B.A.)
| | - Osbourne Quaye
- West African Centre for Cell Biology of Infectious Pathogens (WACCBIP), University of Ghana, P.O. Box LG 54, Legon GA184, Accra, Greater Accra Region, Ghana; (S.M.A.); (O.Q.); (G.A.A.)
- Department of Biochemistry, Cell and Molecular Biology, University of Ghana, P.O. Box LG 54, Legon Accra GA184, Greater Accra Region, Ghana; (E.T.A.); (M.B.A.)
| | - Gordon A. Awandare
- West African Centre for Cell Biology of Infectious Pathogens (WACCBIP), University of Ghana, P.O. Box LG 54, Legon GA184, Accra, Greater Accra Region, Ghana; (S.M.A.); (O.Q.); (G.A.A.)
- Department of Biochemistry, Cell and Molecular Biology, University of Ghana, P.O. Box LG 54, Legon Accra GA184, Greater Accra Region, Ghana; (E.T.A.); (M.B.A.)
| | - Ambroise Wonkam
- Division of Human Genetics, Faculty of Health Sciences, University of Cape Town, Anzio Road, Observatory, Cape Town 7925, South Africa;
- Correspondence: ; Tel.: +27-21-4066307
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High Rates of Three Common GJB2 Mutations c.516G>C, c.-23+1G>A, c.235delC in Deaf Patients from Southern Siberia Are Due to the Founder Effect. Genes (Basel) 2020; 11:genes11070833. [PMID: 32708339 PMCID: PMC7397271 DOI: 10.3390/genes11070833] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2020] [Revised: 07/10/2020] [Accepted: 07/17/2020] [Indexed: 11/17/2022] Open
Abstract
The mutations in the GJB2 gene (13q12.11, MIM 121011) encoding transmembrane protein connexin 26 (Cx26) account for a significant portion of hereditary hearing loss worldwide. Earlier we found a high prevalence of recessive GJB2 mutations c.516G>C, c.-23+1G>A, c.235delC in indigenous Turkic-speaking Siberian peoples (Tuvinians and Altaians) from the Tyva Republic and Altai Republic (Southern Siberia, Russia) and proposed the founder effect as a cause for their high rates in these populations. To reconstruct the haplotypes associated with each of these mutations, the genotyping of polymorphic genetic markers both within and flanking the GJB2 gene was performed in 28 unrelated individuals homozygous for c.516G>C (n = 18), c.-23+1G>A (n = 6), or c.235delC (n = 4) as well as in the ethnically matched controls (62 Tuvinians and 55 Altaians) without these mutations. The common haplotypes specific for mutations c.516G>C, c.-23+1G>A, or c.235delC were revealed implying a single origin of each of these mutations. The age of mutations estimated by the DMLE+ v2.3 software and the single marker method is discussed in relation to ethnic history of Tuvinians and Altaians. The data obtained in this study support a crucial role of the founder effect in the high prevalence of GJB2 mutations c.516G>C, c.-23+1G>A, c.235delC in indigenous populations of Southern Siberia.
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Fukunaga I, Shirai K, Oe Y, Danzaki K, Ohta S, Shiga T, Chen C, Ikeda K, Akamatsu W, Kawano A, Kamiya K. Generation of two induced pluripotent stem cell lines from PBMCs of siblings carrying c.235delC mutation in the GJB2 gene associated with sensorineural hearing loss. Stem Cell Res 2020; 47:101910. [PMID: 32745712 DOI: 10.1016/j.scr.2020.101910] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/19/2020] [Revised: 06/22/2020] [Accepted: 07/07/2020] [Indexed: 10/23/2022] Open
Abstract
The gap junction beta-2 (GJB2) gene is the most common genetic cause of hereditary deafness worldwide. Especially, the 235delC mutation in GJB2 is most prevalent in East Asia. In this study, we generated two iPSC lines from PBMCs of siblings carrying homozygous 235delC mutation which exhibits an audiometric phenotype of profound hearing loss. These iPSC lines had normal karyotype, showed expression of pluripotency markers, and could differentiate into three germ layers. These disease specific iPSC lines may be useful for the construction of the disease models and for the elucidation of pathogenesis in GJB2-related deafness.
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Affiliation(s)
- Ichiro Fukunaga
- Department of Otorhinolaryngology, Juntendo University, Faculty of Medicine, Tokyo, Japan
| | - Kyoko Shirai
- Department of Otolaryngology, Head and Neck Surgery, Tokyo Medical University, Tokyo, Japan
| | - Yoko Oe
- Department of Otorhinolaryngology, Juntendo University, Faculty of Medicine, Tokyo, Japan
| | - Keiko Danzaki
- Department of Otorhinolaryngology, Juntendo University, Faculty of Medicine, Tokyo, Japan
| | - Sayaka Ohta
- Department of Otorhinolaryngology, Juntendo University, Faculty of Medicine, Tokyo, Japan
| | - Takahiro Shiga
- Center for Genomic and Regenerative Medicine, Juntendo University School of Medicine, Tokyo, Japan
| | - Cheng Chen
- Department of Otorhinolaryngology, Juntendo University, Faculty of Medicine, Tokyo, Japan
| | - Katsuhisa Ikeda
- Department of Otorhinolaryngology, Juntendo University, Faculty of Medicine, Tokyo, Japan
| | - Wado Akamatsu
- Center for Genomic and Regenerative Medicine, Juntendo University School of Medicine, Tokyo, Japan
| | - Atsushi Kawano
- Department of Otolaryngology, Head and Neck Surgery, Tokyo Medical University, Tokyo, Japan
| | - Kazusaku Kamiya
- Department of Otorhinolaryngology, Juntendo University, Faculty of Medicine, Tokyo, Japan.
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Zhou Y, Tariq M, He S, Abdullah U, Zhang J, Baig SM. Whole exome sequencing identified mutations causing hearing loss in five consanguineous Pakistani families. BMC MEDICAL GENETICS 2020; 21:151. [PMID: 32682410 PMCID: PMC7368710 DOI: 10.1186/s12881-020-01087-x] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/10/2019] [Accepted: 07/06/2020] [Indexed: 12/20/2022]
Abstract
Background Hearing loss is the most common sensory defect, and it affects over 6% of the population worldwide. Approximately 50–60% of hearing loss patients are attributed to genetic causes. Currently, more than 100 genes have been reported to cause non-syndromic hearing loss. It is possible and efficient to screen all potential disease-causing genes for hereditary hearing loss by whole exome sequencing (WES). Methods We collected 5 consanguineous pedigrees from Pakistan with hearing loss and applied WES in selected patients for each pedigree, followed by bioinformatics analysis and Sanger validation to identify the causal genes. Results Variants in 7 genes were identified and validated in these pedigrees. We identified single candidate variant for 3 pedigrees: GIPC3 (c.937 T > C), LOXHD1 (c.6136G > A) and TMPRSS3 (c.941 T > C). The remaining 2 pedigrees each contained two candidate variants: TECTA (c.4045G > A) and MYO15A (c.3310G > T and c.9913G > C) for one pedigree and DFNB59 (c.494G > A) and TRIOBP (c.1952C > T) for the other pedigree. The candidate variants were validated in all available samples by Sanger sequencing. Conclusion The candidate variants in hearing-loss genes were validated to be co-segregated in the pedigrees, and they may indicate the aetiologies of hearing loss in such patients. We also suggest that WES may be a suitable strategy for hearing-loss gene screening in clinical detection.
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Affiliation(s)
- Yingjie Zhou
- Seven Section of Department of Gynaecology, The Second Hospital of Hebei Medical University, Shijiazhuang, Hebei, China
| | - Muhammad Tariq
- Human Molecular Genetics, Health Biotechnology Division, National Institute for Biotechnology and Genetic Engineering (NIBGE) College, PIEAS, Faisalabad, 38000, Pakistan
| | - Sijie He
- BGI-Shenzhen, Shenzhen, 518083, China.,BGI Genomics, BGI-Shenzhen, Shenzhen, 518083, China
| | - Uzma Abdullah
- Human Molecular Genetics, Health Biotechnology Division, National Institute for Biotechnology and Genetic Engineering (NIBGE) College, PIEAS, Faisalabad, 38000, Pakistan
| | - Jianguo Zhang
- BGI-Shenzhen, Shenzhen, 518083, China. .,BGI Genomics, BGI-Shenzhen, Shenzhen, 518083, China.
| | - Shahid Mahmood Baig
- Human Molecular Genetics, Health Biotechnology Division, National Institute for Biotechnology and Genetic Engineering (NIBGE) College, PIEAS, Faisalabad, 38000, Pakistan.
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Huang CY, Tsai YH, Tsai YC, Lu YC, Chan YH, Hsu CJ, Chiou SH, Wu CC, Cheng YF. Establishment of an induced pluripotent stem cell (iPSC) line from a 7-year-old male patient with profound hearing loss carrying c.235delC in GJB2 gene. Stem Cell Res 2020; 45:101795. [PMID: 32388442 DOI: 10.1016/j.scr.2020.101795] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/28/2019] [Revised: 03/19/2020] [Accepted: 03/25/2020] [Indexed: 10/24/2022] Open
Abstract
Gap junction protein beta 2 gene (GJB2) mutations are the most frequent cause of hereditary hearing impairment. The recessive c.235delC mutation in the GJB2 gene is the most common mutation causing severe to profound sensorineural hearing loss in the Asian population. The induced pluripotent stem cell (iPSC) line was generated using the integration-free Sendai virus method from peripheral blood mononuclear cells (PBMCs) of a hearing-impaired patient with homozygous GJB2 c.235delC mutation. This cell line may serve as a cellular model for studying the pathogenic mechanisms of deafness caused by GJB2 mutations.
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Affiliation(s)
- Chun-Ying Huang
- Department of Medical Research, Taipei Veterans General Hospital, Taipei, Taiwan
| | - Yi-Hsiu Tsai
- Department of Medical Research, Taipei Veterans General Hospital, Taipei, Taiwan
| | - Yi-Ching Tsai
- Department of Medical Research, Taipei Veterans General Hospital, Taipei, Taiwan
| | - Ying-Chang Lu
- Department of Otolaryngology, National Taiwan University Hospital, Taipei, Taiwan
| | - Yen-Hui Chan
- Department of Otolaryngology, National Taiwan University Hospital, Taipei, Taiwan; Department of Otolaryngology, Taichung Tzu Chi Hospital, Buddhist Tzu Chi Medical Foundation, Taichung, Taiwan
| | - Chuan-Jen Hsu
- Department of Otolaryngology, Taichung Tzu Chi Hospital, Buddhist Tzu Chi Medical Foundation, Taichung, Taiwan
| | - Shih-Hwa Chiou
- Department of Medical Research, Taipei Veterans General Hospital, Taipei, Taiwan; Institute of Pharmacology, School of Medicine, National Yang-Ming University, Taipei, Taiwan
| | - Chen-Chi Wu
- Department of Otolaryngology, National Taiwan University Hospital, Taipei, Taiwan.
| | - Yen-Fu Cheng
- Department of Medical Research, Taipei Veterans General Hospital, Taipei, Taiwan; Department of Otolaryngology-Head and Neck Surgery, Taipei Veterans General Hospital, Taipei, Taiwan; School of Medicine, National Yang-Ming University, Taipei, Taiwan.
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Shinagawa J, Moteki H, Nishio SY, Noguchi Y, Usami SI. Haplotype Analysis of GJB2 Mutations: Founder Effect or Mutational Hot Spot? Genes (Basel) 2020; 11:E250. [PMID: 32120898 PMCID: PMC7140863 DOI: 10.3390/genes11030250] [Citation(s) in RCA: 14] [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: 02/02/2020] [Revised: 02/25/2020] [Accepted: 02/25/2020] [Indexed: 01/29/2023] Open
Abstract
The GJB2 gene is the most frequent cause of congenital or early onset hearing loss worldwide. In this study, we investigated the haplotypes of six GJB2 mutations frequently observed in Japanese hearing loss patients (i.e., c.235delC, p.V37I, p.[G45E; Y136X], p.R143W, c.176_191del, and c.299_300delAT) and analyzed whether the recurring mechanisms for each mutation are due to founder effects or mutational hot spots. Furthermore, regarding the mutations considered to be caused by founder effects, we also calculated the age at which each mutation occurred using the principle of genetic clock analysis. As a result, all six mutations were observed in a specific haplotype and were estimated to derive from founder effects. Our haplotype data together with their distribution patterns indicated that p.R143W and p.V37I may have occurred as multiple events, and suggested that both a founder effect and hot spot may be involved in some mutations. With regard to the founders' age of frequent GJB2 mutations, each mutation may have occurred at a different time, with the oldest, p.V37I, considered to have occurred around 14,500 years ago, and the most recent, c.176_191del, considered to have occurred around 4000 years ago.
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Affiliation(s)
- Jun Shinagawa
- Department of Otorhinolaryngology, Shinshu University School of Medicine, 3-1-1 Asahi, Matsumoto, Nagano 390-8621, Japan; (J.S.); (H.M.)
| | - Hideaki Moteki
- Department of Otorhinolaryngology, Shinshu University School of Medicine, 3-1-1 Asahi, Matsumoto, Nagano 390-8621, Japan; (J.S.); (H.M.)
- Department of Hearing Implant Sciences, Shinshu University School of Medicine, 3-1-1 Asahi, Matsumoto, Nagano 390-8621, Japan; (S.-y.N.); (Y.N.)
| | - Shin-ya Nishio
- Department of Hearing Implant Sciences, Shinshu University School of Medicine, 3-1-1 Asahi, Matsumoto, Nagano 390-8621, Japan; (S.-y.N.); (Y.N.)
| | - Yoshihiro Noguchi
- Department of Hearing Implant Sciences, Shinshu University School of Medicine, 3-1-1 Asahi, Matsumoto, Nagano 390-8621, Japan; (S.-y.N.); (Y.N.)
- Department of Otorhinolaryngology, International University of Health and Welfare, Mita Hospital, 1-4-3 Mita, Minato-ku, Tokyo 108-8329, Japan
| | - Shin-ichi Usami
- Department of Otorhinolaryngology, Shinshu University School of Medicine, 3-1-1 Asahi, Matsumoto, Nagano 390-8621, Japan; (J.S.); (H.M.)
- Department of Hearing Implant Sciences, Shinshu University School of Medicine, 3-1-1 Asahi, Matsumoto, Nagano 390-8621, Japan; (S.-y.N.); (Y.N.)
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48
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Koohiyan M. Next generation sequencing and genetics of hereditary hearing loss in the iranian population: New insights from a systematic review. Int J Pediatr Otorhinolaryngol 2020; 129:109756. [PMID: 31704577 DOI: 10.1016/j.ijporl.2019.109756] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/30/2019] [Revised: 10/25/2019] [Accepted: 10/26/2019] [Indexed: 02/07/2023]
Abstract
BACKGROUND Hereditary hearing loss (HL) as a common disorder is genetically heterogeneous, which poses a challenge for clinical and molecular diagnosis. Next-generation sequencing (NGS) technologies have proven to be the best solution for mutational screening, even though it is not always conclusive. Here, we have reviewed the results of previously published data on HL mutations identified with NGS, as well as the efficiency of this technology in detecting HL in Iran. METHODS A systematic literature review of the PubMed, Google Scholar, Web of Science, and Science Direct databases were conducted for articles published before May 2019. The primary data of these studies, including the number of samples, mutation frequency and so on were extracted. RESULTS Seventy-five articles were reviewed, and 10 met our inclusion criteria. Totally 432 unrelated families were included and analyzed for the type and prevalence of the gene mutations and pathogenic variants were discovered in 34 non-syndromic HL (NSHL) genes. Altogether 237 different genetic mutations were detected. However, p. Gln1576Stop in PCDH15 was the most common mutation accounting for 1% of the populations studied. NGS platforms have yielded only a 47.1% molecular diagnosis rate for NSHL etiologies in the Iranian population, which is significantly lower than that identified in the other part of the Middle East. CONCLUSION The results showed that NGS platforms can greatly assist and enhance HL diagnosis and improve molecular diagnostic outcome. However, researchers were unable to provide 53% of their Iranian cohort with a molecular diagnosis for their HL. It seems that many rare genes are responsible for the majority of HL in the Iranian cohort. Future explorative investigations utilizing NGS technologies, such as WES, into the Iranian population are warranted.
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Affiliation(s)
- Mahbobeh Koohiyan
- Cancer Research Center, Shahrekord University of Medical Sciences, Shahrekord, Iran.
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49
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Concurrent hearing and genetic screening in a general newborn population. Hum Genet 2020; 139:521-530. [PMID: 32002660 DOI: 10.1007/s00439-020-02118-6] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2019] [Accepted: 01/17/2020] [Indexed: 01/21/2023]
Abstract
Newborn hearing screening is not designed to detect delayed-onset prelingual hearing loss or aminoglycoside-antibiotic-induced ototoxicity. Cases with severe to profound hearing loss have been reported to have been missed by newborn hearing screens. The aim of this study was to evaluate the efficacy of concurrent hearing and genetic screening in the general population and demonstrate its benefits in practice. Enrolled newborns received concurrent hearing and genetic screens between September 1, 2015 and January 31, 2018. Of the 239,636 eligible infants (median age, 19 months), 548 (0.23%) had prelingual hearing loss. Genetic screening identified 14 hearing loss patients with positive genotypes and 27 patients with inconclusive genotypes who had passed the hearing screens. In addition, the genetic screen identified 0.23% (570/239,636) of the newborns and their family members as at-risk for ototoxicity, which is undetectable by hearing screens. In conclusion, genetic screening complements newborn hearing screening by improving the detection of infants at risk of hereditary hearing loss and ototoxicity, and by informing genotype-based clinical management for affected infants and their family members. Our findings suggest that the practice should be further validated in other populations and rigorous cost-effectiveness analyses are warranted.
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50
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Yu X, Lin Y, Xu J, Che T, Li L, Yang T, Wu H. Molecular epidemiology of Chinese Han deaf patients with bi-allelic and mono-allelic GJB2 mutations. Orphanet J Rare Dis 2020; 15:29. [PMID: 31992338 PMCID: PMC6986010 DOI: 10.1186/s13023-020-1311-2] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2019] [Accepted: 01/17/2020] [Indexed: 02/07/2023] Open
Abstract
Background Recessive mutations in GJB2 is the most common cause of genetic hearing loss worldwide. The aim of this study is to determine the spectrum and frequency of GJB2 variants in Chinese Han deaf patients and to investigate the underlying causative genes in patients with mono-allelic GJB2 mutations. Methods We analyzed the mutation screening results of GJB2 in 1852 Chinese Han probands with apparently autosomal-recessive hearing loss in our laboratory. Targeted next-generation sequencing of 139 known deafness-related genes were performed in 44 probands with mono-allelic GJB2 mutations. Results Bi-allelic GJB2 mutations was identified in 25.65% of patients, in which the c.235delC (p.L79Cfs*3) mutation is the most frequent cause for both severe-to-profound (84.93%) and mild-to-moderate hearing loss (54.05%), while the c.109G > A (p.V37I) mutation is another frequent cause for mild-to-moderate hearing loss (40.54%). In 3.89% of patients only one mutant allele can be identified in GJB2. Targeted next generation sequencing in 44 such probands revealed digenic heterozygous mutations in GJB2/GJB6 and GJB2/GJB3 as the likely pathogenic mechanism in three probands. In 13 probands, on the other hand, pathogenic mutations in other deafness-associated genes (STRC, EYA1, MITF, PCDH15, USH2A, MYO15A, CDH23, OTOF, SLC26A4, SMPX, and TIMM8A) can be identified as the independent genetic cause, suggesting that the mono-allelic GJB2 mutations in those probands is likely co-incidental. Conclusions Our results demonstrated that GJB2 should be a primary target for mutation screening in Chinese Han deaf patients, and those with mono-allelic GJB2 mutations should be further screened by next generation sequencing.
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Affiliation(s)
- Xiaoyu Yu
- Department of Otorhinolaryngology-Head and Neck Surgery, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China.,Ear Institute, Shanghai Jiao Tong University School of Medicine, Shanghai, China.,Shanghai Key Laboratory of Translational Medicine on Ear and Nose Diseases, Shanghai, China
| | - Yun Lin
- Department of Otorhinolaryngology-Head and Neck Surgery, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China.,Ear Institute, Shanghai Jiao Tong University School of Medicine, Shanghai, China.,Shanghai Key Laboratory of Translational Medicine on Ear and Nose Diseases, Shanghai, China
| | - Jun Xu
- Department of Otorhinolaryngology-Head and Neck Surgery, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China.,Ear Institute, Shanghai Jiao Tong University School of Medicine, Shanghai, China.,Shanghai Key Laboratory of Translational Medicine on Ear and Nose Diseases, Shanghai, China
| | - Tuanjie Che
- Key Laboratory of Functional Genomic and Molecular Diagnosis of Gansu Province, Lanzhou, 730030, China
| | - Lin Li
- Laboratory of Precision Medicine and Translational Medicine, Suzhou Hospital Affiliated to Nanjing Medical University, Suzhou Science and Technology Town Hospital, Suzhou, 215153, China
| | - Tao Yang
- Department of Otorhinolaryngology-Head and Neck Surgery, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China. .,Ear Institute, Shanghai Jiao Tong University School of Medicine, Shanghai, China. .,Shanghai Key Laboratory of Translational Medicine on Ear and Nose Diseases, Shanghai, China.
| | - Hao Wu
- Department of Otorhinolaryngology-Head and Neck Surgery, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China. .,Ear Institute, Shanghai Jiao Tong University School of Medicine, Shanghai, China. .,Shanghai Key Laboratory of Translational Medicine on Ear and Nose Diseases, Shanghai, China.
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