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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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Fu Y, Zhao Z, Zheng J, Zhu Y, Sun L. Gene Screening for Non-Syndromic Deafness in Hainanese Patients. J Int Adv Otol 2023; 19:283-287. [PMID: 37528592 PMCID: PMC10544452 DOI: 10.5152/iao.2023.21582] [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: 10/09/2021] [Accepted: 10/21/2022] [Indexed: 08/03/2023] Open
Abstract
BACKGROUND Hainan Province is the southernmost island in China, far from the mainland, and the resident population changes little. In order to understand the mutation spectrum in Hainan and provide effective genetic counseling for deaf people, we carried out genetic analysis on the non-comprehensive hearing impairment in this population. Therefore, in this study, 183 children with moderate sensorineural deafness in the northeast of Hainan were analyzed with susceptibility gene carrying and gene mutation, providing some reference for hainan to guide the prevention and treatment of deafness. METHODS Complete clinical evaluations were performed on 183 unrelated patients with a non-syndromic hearing impairment from Hainan Province. Each subject was screened for common mutations using the matrix-assisted laser desorption ionization-time of flight mass spectrometry, including GJB2 c.35delG,c.235delC,c.299_300del AT,c.176_191del16,c.167delT; GJB3 c.538 C>T,c.547G >A;SLC26A4 IVS7-2 A>G,c.2168 A>G,c.1174A>T,c.1229 C>T,c.1226G>A,c.1975G>C,c.2027T>A,c.2162C>T,c.281C>T,c.589G>A,IVS15+5G>A; and mtRNA 1494 C>T,1555 A>G. RESULTS Genetic analysis showed that GJB2, SLC26A4, and mitochondrial M. 1555A > G mutations accounted for 7.10%, 8.74%, and 0.55% of the etiology of non-syndromic hearing impairment, respectively. Common mutations include GJB2 C. 235delC, SLC26A4 c.I vs7-2a →G, C. 2168A→G, and mitochondrial M. 1555A > G. The total mutation rate in Hainan was 16.39%. CONCLUSION Our study is the first one to carry out genetic analysis on non-syndromic hearing impairment in Hainan. The results show that in the cases of non-syndromic hearing impairment in these areas, there is a clear genetic cause accounted for 16.39%, and the mutation hot spots are mainly GJB2 and SLC26A4, and SLC26A4 is the most common mutation site. This study provides useful and targeted information for genetic counseling of deafness in people with non-syndromic hearing impairment in Hainan.
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Affiliation(s)
- Yifei Fu
- Department of ENT & HN Surgery, ainan General Hospital, Hainan Affiliated Hospital of Hainan Medical University, Haikou, China
| | - Zhibin Zhao
- Department of ENT & HN Surgery, ainan General Hospital, Hainan Affiliated Hospital of Hainan Medical University, Haikou, China
| | - Jing Zheng
- Department of ENT & HN Surgery, ainan General Hospital, Hainan Affiliated Hospital of Hainan Medical University, Haikou, China
| | - Yuanping Zhu
- Department of ENT & HN Surgery, ainan General Hospital, Hainan Affiliated Hospital of Hainan Medical University, Haikou, China
| | - Liang Sun
- Department of ENT & HN Surgery, ainan General Hospital, Hainan Affiliated Hospital of Hainan Medical University, Haikou, China
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D DD, Patil GC. Cross-Sectional Study to Estimate the Prevalence of Inner-Ear Anomalies in Children With Congenital Sensorineural Hearing Loss by High-Resolution Computed Tomography (HRCT) Temporal Bone Scan. Cureus 2023; 15:e42160. [PMID: 37602054 PMCID: PMC10439020 DOI: 10.7759/cureus.42160] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 07/17/2023] [Indexed: 08/22/2023] Open
Abstract
Background Congenital sensorineural hearing loss (SNHL) is one of the most common birth defects with an incidence ratio of 1:1000 live births in India. Imaging plays an important role in the evaluation of congenital SNHL. As there is a paucity of studies in the Indian setting to determine the prevalence of inner-ear abnormalities, this study attempts to throw light on the various inner-ear anomalies that are prevalent in our setup in the Northern part of Karnataka using high-resolution computed tomography (HRCT) temporal bone scan. Objectives The objectives of this study are estimation of the prevalence of inner-ear anomalies in children with congenital SNHL by employing a radiologic assessment of HRCT temporal bone scans and determination of the factors associated with the identification of these abnormalities like demographic factors and degree of hearing loss. Methods Children with congenital SNHL underwent clinical evaluation with history taking and general and ear examination. Otoacoustic emission (OAE) and brainstem evoked response audiometry (BERA) measurements were obtained. A radiological assessment by HRCT temporal bone scan was done. Using the classification criteria of inner-ear malformations by Jackler and Sennaroglu as a reference, diagnostic standards were established in studying inner-ear malformations. Data were collected and entered in a Performa, which includes patient's demography, audiological findings, and radiological findings, and the results were analyzed. Data were entered into Microsoft Excel, and statistical analysis was carried out using IBM SPSS Statistics for Windows, Version 27 (Released 2020; IBM Corp., Armonk, New York, United States). Categorical variables were presented as frequency and percentage. Then the prevalence of inner-ear anomaly was estimated. Correlation between inner-ear anomaly and other factors was calculated using the Chi-square test. Results The prevalence of inner-ear anomalies identified in congenital SNHL by HRCT scan was as follows: 26.08% (12/46), 26.1% (24/92) of inner ears was anomalous, 23.9% of the cochlea was anomalous, 6.5% of the vestibule was anomalous, 5.4% of the vestibular aqueduct was anomalous, and 3.2% of the semicircular canal was anomalous. Cochlear aplasia, incomplete partition, common cavity, and cochlear hypoplasia were the anomalies found. Few cochleas had an abnormal cochlear height, though they appeared normal structurally. The dilated vestibule was the most common vestibular abnormality. There was a negative association found between the inner-ear anomaly in children with congenital SNHL who had a history of consanguineous marriage in their parents. Conclusion High-resolution temporal CT scanning could provide detailed information on the pathology of the inner ear in congenital SNHL, which can help in better planning the surgery for cochlear implantation and understanding the prognosis.
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Affiliation(s)
- Deeksha D D
- Otolaryngology-Head and Neck Surgery, Karnataka Institute of Medical Sciences, Hubballi, IND
| | - G C Patil
- Radiology, Karnataka Institute of Medical Sciences, Hubballi, IND
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Dai Q, Dai W, Wang D, Liu X, Zou L, Chen J, Zheng H, Duan M. Molecular screening of patients with profound hearing loss from Chengdu, China. Acta Otolaryngol 2022; 142:57-60. [PMID: 34936523 DOI: 10.1080/00016489.2021.2014564] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
BACKGROUND The rate of genetic deafness in Chengdu is still underestimated. OBJECTIVE To investigate patients' molecular etiology with profound hearing loss and facilitate genetic counseling for their families, we screened deafness-related genes of profound hearing loss in the population. METHODS A total of 1427 unrelated patients with profound hearing loss containing all age groups in the administrative area of City Chengdu (Sichuan, China) were enrolled in this study, and the average examination rate is 81.13%. Nine loci of four deaf-associated genes (GJB2, GJB3, SLC26A4, and mitochondrial 12SrRNA gene) were analyzed. Then we examined all the deaf-associated mutations and compared them between groups. RESULTS The average age of all subjects is 48.537 ± 19.077 years, peak range in 41-70 years (985/1427, 69.03%). The positive mutation rates of patients in GJB2, SLC26A4, and 12S rRNA are respectively 8.90%, 4.84%, and 5.96%, and GJB3 none. In group A the GJB2 and SLC26A4 mutation rate is 14.17% (36/254), which is remarkably higher than group B (6.14%, 72/1173). The frequency of 12SrRNA mutations is 3.15% (8/254) in group A, which is significantly different (χ2 = 4.34, p < .05) from that of group B (6.56%, 77/1173). CONCLUSIONS AND SIGNIFICANCE The mutation rate of mtDNA 12SrRNA is higher than SLC26A4 gene in our study, which is different from other parts of China. And the deaf-related gene mutation spectrums have a distinct age difference.
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Affiliation(s)
- Qingqing Dai
- Department of Otolaryngology, West China Hospital, Sichuan University, Chengdu, China
- Department of Otolaryngology Head and Neck & Audiology and Neurotology, Department of Clinical Science, Intervention and Technology, Karolinska University Hospital, Karolinska Institute, Stockholm, Sweden
| | - Wei Dai
- Department of Otolaryngology, West China Hospital, Sichuan University, Chengdu, China
| | - Dan Wang
- Department of Otolaryngology, West China Hospital, Sichuan University, Chengdu, China
| | - Xia Liu
- Sichuan Hearing and Language Rehabilitation Center, Chengdu, China
| | - Ling Zou
- Chengdu Women’s and Children’s Central Hospital, Chengdu, China
| | - Jiani Chen
- Department of Otolaryngology, West China Hospital, Sichuan University, Chengdu, China
| | - Hong Zheng
- Department of Otolaryngology, West China Hospital, Sichuan University, Chengdu, China
| | - Maoli Duan
- Department of Otolaryngology Head and Neck & Audiology and Neurotology, Department of Clinical Science, Intervention and Technology, Karolinska University Hospital, Karolinska Institute, Stockholm, Sweden
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Duan S, Guo Y, Chen X, Li Y. Genetic mutations in patients with nonsyndromic hearing impairment of minority and Han Chinese ethnicities in Qinghai, China. J Int Med Res 2021; 49:3000605211000892. [PMID: 33827324 PMCID: PMC8040579 DOI: 10.1177/03000605211000892] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Objective Mutations in GJB2, SLC26A4, and mitochondrial (mt)DNA 12S rRNA genes are the main cause of nonsyndromic hearing impairment. The present study analyzed these mutations in ethnic minority and Han Chinese patients with nonsyndromic hearing impairment from Qinghai, China. Methods The SNPscan assay was used to analyze mutation spectra and frequencies in the two patient groups. Results GJB2 mutations were detected in 9.5% (20/210) of minority patients and 20.88% (48/230) of Han Chinese patients. The most common Han Chinese GJB2 variants were c.235delC and c.299_300delAT, whereas c.235delC and c.109G > A were the most prevalent in minority patients. SLC26A4 mutations were detected in 5.71% (12/210) of minority patients and 14.35% (33/230) of Han Chinese patients, and mtDNA 12S rRNA mutations were detected in 4.28% (9/210) of minority patients and 9.13% (21/230) of Han Chinese patients. Conclusions These data indicate that the mutation frequencies of three deafness-associated genes were significantly higher in Han Chinese patients than in minority patients. Moreover, the GJB2 mutation spectrum was shown to differ between these two patient groups.
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Affiliation(s)
- Shihong Duan
- Department of Otolaryngology-Head and Neck Surgery, Second Hospital of Lanzhou University, Lanzhou, China
| | - Yufen Guo
- Department of Otolaryngology-Head and Neck Surgery, Second Hospital of Lanzhou University, Lanzhou, China
| | - Xingjian Chen
- Department of Otolaryngology-Head and Neck Surgery, Second Hospital of Lanzhou University, Lanzhou, China
| | - Yong Li
- Department of Otolaryngology-Head and Neck Surgery, Second Hospital of Lanzhou University, Lanzhou, China
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Zhou Y, Li C, Li M, Zhao Z, Tian S, Xia H, Liu P, Han Y, Ren R, Chen J, Jia C, Guo W. Mutation analysis of common deafness genes among 1,201 patients with non-syndromic hearing loss in Shanxi Province. Mol Genet Genomic Med 2019; 7:e537. [PMID: 30693673 PMCID: PMC6418354 DOI: 10.1002/mgg3.537] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2018] [Revised: 08/12/2018] [Accepted: 11/16/2018] [Indexed: 12/24/2022] Open
Abstract
Background Hearing impairment is one of most frequent birth defects, which affects nearly 1 in every 1,000 live births. However, the molecular etiology of non‐syndromic deafness in China is not well studied. Here, we have investigated the presence of mutations in three genes commonly mutated in non‐syndromic deafness patients in Shanxi Province, which has the highest frequency of birth defects in China. Methods In total, 1,201 unrelated non‐syndromic deafness patients and 300 healthy individuals were enrolled. The hearing ability was confirmed by audiologic evaluation. Three major deafness‐related genes (GJB2, SLC26A4 (PDS), and mtDNA 12S rRNA) of all individuals enrolled were analyzed by Sanger sequencing. Results The results showed that GJB2 mutations accounted for 21.23% (255/1,201) in the patient group, with c.235delC, a hotspot mutation, accounting for 10.99% (132/1,201). Moreover, 11 new GJB2 mutations were identified. SLC26A4 mutations accounted for 9.33% (112/1,201) in the patient group, with IVS7‐2A>G as the most prevalent mutation accounting for 4.75% (57/1,201). In addition, 15 patients (1.25%) were found to carry mtDNA 12S rRNA c.1555A>G mutation, while only two cases had the mtDNA 12S rRNA c.1494C>T. Conclusion In our research, it was found that c.235delC in GJB2 and c.919‐2A>G (IVS7‐2A>G) in SLC26A4 were the highest frequency pathogenic variants in Shanxi Province. Taken together, our data will enrich the database of deafness mutations and will help clinical diagnosis, treatment, and genetic counseling of hearing impairment.
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Affiliation(s)
- Yongan Zhou
- Shanxi Medical University Second Affiliated Hospital, Taiyuan, Shanxi, China
| | - Chao Li
- The Graduate School, Shanxi Medical University, Taiyuan, Shanxi, China
| | - Min Li
- The Graduate School, Shanxi Medical University, Taiyuan, Shanxi, China
| | - Zhonghua Zhao
- Institute of Biomedical Sciences, Shanxi University, Taiyuan, Shanxi, China
| | - Shuxiong Tian
- The Graduate School, Shanxi Medical University, Taiyuan, Shanxi, China
| | - Hou Xia
- The Graduate School, Shanxi Medical University, Taiyuan, Shanxi, China
| | - Peixian Liu
- Shanxi Medical University Second Affiliated Hospital, Taiyuan, Shanxi, China
| | - Yaxin Han
- The Graduate School, Shanxi Medical University, Taiyuan, Shanxi, China
| | - Ruirui Ren
- The Graduate School, Shanxi Medical University, Taiyuan, Shanxi, China
| | - Jianping Chen
- The Graduate School, Shanxi Medical University, Taiyuan, Shanxi, China
| | - Caihong Jia
- Shanxi Medical University Second Affiliated Hospital, Taiyuan, Shanxi, China
| | - Wei Guo
- Xinzhou Traditional Chinese Medicine Hospital, Xinzhou, Shanxi, China
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Zhao P, Lin L, Lan L. Analysis of mutation spectrum of common deafness-causing genes in Hakka newborns in southern China by semiconductor sequencing. Medicine (Baltimore) 2018; 97:e12285. [PMID: 30235673 PMCID: PMC6160144 DOI: 10.1097/md.0000000000012285] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/05/2018] [Accepted: 08/15/2018] [Indexed: 11/27/2022] Open
Abstract
Hearing loss is a common neurosensory disorder, approximately half of the cases are caused by genetic factors, and approximately 70% of hereditary hearing impairments are nonsyndromic hearing loss (NSHL). The mutations of GJB2 (gap junction beta-2 protein), GJB3 (gap junction beta-3 protein), SLC26A4 (solute carrier family 26 member 4), and MT-RNR1 (mitochondrially encoded 12S RNA) are the most common inherited causes of NSHL. Because of different genetic backgrounds, the mutation spectrum of these common deafness-causing genes varies among different regions in China. Because no data are known on these mutations among the Hakka population of Southern China, we aim to investigate the mutation spectrum to add these to neonatal screening and genetic counseling. A total of 1252 blood samples from newborns have been detected by semiconductor sequencing for 100 mutations loci of 18 deafness-causing genes. Of the participants, 95 subjects carried deafness-causing genes mutations with the carrier rate of 7.59%. The mutation frequencies of GJB2, SLC26A4, GJB3, and mitochondrial genes were 3.04%, 3.51%, 0.16%, and 0.88%, respectively. We followed up subjects with single-gene homozygous or compound heterozygous mutations. Our study firstly analyzed deafness-causing genes mutation spectrum in Hakka population, providing evidence for future neonatal screening and genetic counseling in this area.
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Affiliation(s)
- Pingsen Zhao
- Clinical Core Laboratory
- Center for Precision Medicine, Meizhou People's Hospital (Huangtang Hospital), Meizhou Hospital Affiliated to Sun Yat-sen University
- Guangdong Provincial Engineering and Technology Research Center for Molecular Diagnostics of Cardiovascular Diseases
- Meizhou Municipal Engineering and Technology Research Center for Molecular Diagnostics of Cardiovascular Diseases
- Meizhou Municipal Engineering and Technology Research Center for Molecular Diagnostics of Major Genetic Disorders
- Prenatal Diagnosis Center, Meizhou People's Hospital (Huangtang Hospital), Meizhou Hospital Affiliated to Sun Yat-sen University, Meizhou, P. R. China
| | - Lifang Lin
- Clinical Core Laboratory
- Center for Precision Medicine, Meizhou People's Hospital (Huangtang Hospital), Meizhou Hospital Affiliated to Sun Yat-sen University
- Guangdong Provincial Engineering and Technology Research Center for Molecular Diagnostics of Cardiovascular Diseases
- Meizhou Municipal Engineering and Technology Research Center for Molecular Diagnostics of Cardiovascular Diseases
- Meizhou Municipal Engineering and Technology Research Center for Molecular Diagnostics of Major Genetic Disorders
- Prenatal Diagnosis Center, Meizhou People's Hospital (Huangtang Hospital), Meizhou Hospital Affiliated to Sun Yat-sen University, Meizhou, P. R. China
| | - Liubing Lan
- Prenatal Diagnosis Center, Meizhou People's Hospital (Huangtang Hospital), Meizhou Hospital Affiliated to Sun Yat-sen University, Meizhou, P. R. China
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Lin J, Huang H, Lv G, Xu X, Lin W, Xu X, Cheng J, Zheng M. Chronic prenatal hypoxia impairs cochlear development, a mechanism involving connexin26 expression and promoter methylation. Int J Mol Med 2017; 41:852-858. [PMID: 29207085 PMCID: PMC5752184 DOI: 10.3892/ijmm.2017.3303] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2017] [Accepted: 11/02/2017] [Indexed: 12/31/2022] Open
Abstract
Chronic prenatal hypoxia is a damaging to fetal development and may have various consequences, including hearing loss. Connexin 26 (Cx26) is one of the major protein subunits required for gap junction formation, and has an important role in maintaining homeostasis in the cochlea and normal hearing. Cx26 mutation and expression abnormality are closely associated with inherited nonsyndromic deafness, but the association between Cx26 and prenatal hypoxia is less established. The present study aimed to examine Cx26 expression and aberrant methylation the Cx26 promoter region in the cochlea from rats exposed to chronic prenatal hypoxia. Hematoxylin and eosin staining demonstrated that the number of hair cells in the organ of Corti were less in the hypoxia group. Reverse transcription-quantitative polymerase chain reaction and western blot analysis revealed that protein and mRNA levels of Cx26 were decreased in the hypoxia group compared with the control group. Further bisulfite sequencing analysis revealed that prenatal hypoxia significantly increased the methylation status of the promoter region of the Cx26 gene. These results demonstrate that chronic prenatal hypoxia caused hearing impairment, and suggest that promoter region hypermethylation and expression downregulation of Cx26 underlie the mechanism of action.
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Affiliation(s)
- Jingcang Lin
- Department of Anatomy, School of Basic Medical Sciences, Fujian Medical University, Fuzhou, Fujian 350004, P.R. China
| | - Huang Huang
- Department of Histology and Embryology, Quanzhou Medical College, Quanzhou, Fujian 362100, P.R. China
| | - Guorong Lv
- Department of Medical Imaging, Quanzhou Medical College, Quanzhou, Fujian 362100, P.R. China
| | - Xiangyang Xu
- Department of Histology and Embryology, Quanzhou Medical College, Quanzhou, Fujian 362100, P.R. China
| | - Wendong Lin
- Department of Anatomy, Quanzhou Medical College, Quanzhou, Fujian 362100, P.R. China
| | - Xianyan Xu
- Department of Anatomy, Quanzhou Medical College, Quanzhou, Fujian 362100, P.R. China
| | - Jing Cheng
- Department of Histology and Embryology, Quanzhou Medical College, Quanzhou, Fujian 362100, P.R. China
| | - Ming Zheng
- Department of Anatomy, School of Basic Medical Sciences, Fujian Medical University, Fuzhou, Fujian 350004, P.R. China
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Tlili A, Al Mutery A, Kamal Eddine Ahmad Mohamed W, Mahfood M, Hadj Kacem H. Prevalence of GJB2 Mutations in Affected Individuals from United Arab Emirates with Autosomal Recessive Nonsyndromic Hearing Loss. Genet Test Mol Biomarkers 2017; 21:686-691. [PMID: 29016196 DOI: 10.1089/gtmb.2017.0130] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
AIM Mutations in the gap junction protein beta 2 (GJB2) gene are responsible for more cases of nonsyndromic recessive hearing loss than any other gene. The purpose of our study was to evaluate the prevalence of GJB2 mutations among affected individuals from United Arab Emirates (UAE). METHODS There were 50 individuals diagnosed with hereditary hearing loss and 120 healthy individuals enrolled in the study. The Sanger sequencing method was used to screen the GJB2 coding region in all affected individuals. The c.-1G>A variant was determined by the polymerase chain reaction-restriction fragment length polymorphism method in normal individuals. RESULTS AND DISCUSSION Nine cases with bi-allelic mutations and three cases with mono-allelic mutations were detected in 12 out of 50 patients (24%). The homozygous mutation c.35delG was identified as the cause of hearing loss in six participants (12%). The mutation c.506G>A was identified in three affected individuals (6%). The allelic frequency (14%) and low percentage of individuals that were homozygous (2%) for the c.35delG mutation suggest that there are other genes responsible for nonsyndromic deafness in the UAE population. The results reported here are a preliminary step in collecting epidemiological data regarding autosomal recessive nonsyndromic hearing loss related to GJB2 gene mutations among the UAE population. CONCLUSION The c.35delG mutation of the GJB2 gene is the most frequently seen causative mutation in the UAE and is followed by the p.Cys169Tyr mutation.
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Affiliation(s)
- Abdelaziz Tlili
- 1 Department of Applied Biology, College of Sciences, University of Sharjah , Sharjah, United Arab Emirates .,2 Human Genetics and Stem Cell Laboratory, Research Institute of Sciences and Engineering, University of Sharjah , Sharjah, United Arab Emirates
| | - Abdullah Al Mutery
- 1 Department of Applied Biology, College of Sciences, University of Sharjah , Sharjah, United Arab Emirates
| | | | - Mona Mahfood
- 1 Department of Applied Biology, College of Sciences, University of Sharjah , Sharjah, United Arab Emirates
| | - Hassen Hadj Kacem
- 1 Department of Applied Biology, College of Sciences, University of Sharjah , Sharjah, United Arab Emirates .,2 Human Genetics and Stem Cell Laboratory, Research Institute of Sciences and Engineering, University of Sharjah , Sharjah, United Arab Emirates
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Hofer T, Sagli G. 'Civilising' Deaf people in Tibet and Inner Mongolia: governing linguistic, ethnic and bodily difference in China. DISABILITY & SOCIETY 2017; 32:443-466. [PMID: 28553018 PMCID: PMC5425626 DOI: 10.1080/09687599.2017.1302319] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 05/11/2016] [Accepted: 03/01/2017] [Indexed: 06/07/2023]
Abstract
The People's Republic of China is home to over 20 million d/Deaf and hard-of-hearing people, many among them belonging to ethnic minorities. Drawing on ethnographic fieldwork in two minority regions, the Tibet Autonomous Region and the Inner Mongolian Autonomous Region, this article comparatively discusses findings on sign language use, education and state welfare policies. The situation in these domains is analysed through the framework of the 'civilising project', coined by Harrell, and its impacts on the d/Deaf and hard-of-hearing among ethnic minorities are shown. For instance, through the promotion of Chinese and Chinese Sign Language over and above the use of local sign and written languages as well as through education and the medicalisation of disabilities.
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Affiliation(s)
- Theresia Hofer
- Department of Archaeology and Anthropology, University of Bristol, Bristol, UK
- Institute of Social and Cultural Anthropology, University of Oxford, Oxford, UK
| | - Gry Sagli
- Department of International Studies and Interpreting, Oslo and Akershus University College of Applied Sciences, Oslo, Norway
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11
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Qing J, Zhou Y, Lai R, Hu P, Ding Y, Wu W, Xiao Z, Ho PT, Liu Y, Liu J, Du L, Yan D, Goldstein BJ, Liu X, Xie D. Prevalence of mutations in GJB2, SLC26A4, and mtDNA in children with severe or profound sensorineural hearing loss in southwestern China. Genet Test Mol Biomarkers 2015; 19:52-8. [PMID: 25493717 DOI: 10.1089/gtmb.2014.0241] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022] Open
Abstract
AIM To study the distribution characteristics of common mutations in the GJB2, SLC26A4, and mtDNA genes in children with severe or profound sensorineural hearing loss (SNHL) in southwestern China. MATERIALS AND METHODS A total of 1,164 individuals were recruited to screen for the common GJB2, SLC26A4, and mtDNA mutations by microarrays. Subsequencing for the coding region of the GJB2 gene in the samples without the GJB2 hotspot mutations as well as subsequencing for the exon 1 of the TRMU gene in those samples with the mtDNA hotspot mutations was performed by Sanger sequencing. All mutations were analyzed in association with medical imaging. RESULTS In this study, 28.43% of all subjects carried mutations. The mutation frequencies in the GJB2, SLC26A4, and mtDNA genes were 17.27%, 7.04%, and 4.12%, respectively. No TRMU mutation was found in the study. The frequency of the mtDNA mutations in the multiethnic minorities was six times that in the Han (11.23% vs. 1.91%; p approaches 0.000) and in the urban group was one-third of that in the suburban group(1.49% vs. 4.47%; p=0.047). The frequency of the GJB2 mutations in urban and suburban groups was 23.38% and 15.99%, respectively (p=0.012). The enlarged vestibular aqueduct (EVA) was the most common inner ear malformation and ∼79.10% of EVA cases were associated with the SLC26A4 mutations. CONCLUSIONS More than one-fourth of children with severe or profound SNHL carried the common deafness mutations. The proportions of ethnic minorities and urban subjects could impact the frequency of the GJB2 and mtDNA mutations. The SLC26A4 hotspot mutations are prevalent and correlate strongly with EVA.
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Affiliation(s)
- Jie Qing
- 1 Department of Otolaryngology and Head and Neck Surgery, The Second Xiangya Hospital, Institute of Otology, Central South University , Changsha, China
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12
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Cordblood-Based High-Throughput Screening for Deafness Gene of 646 Newborns in Jinan Area of China. Clin Exp Otorhinolaryngol 2015; 8:211-7. [PMID: 26330914 PMCID: PMC4553350 DOI: 10.3342/ceo.2015.8.3.211] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2014] [Revised: 06/18/2014] [Accepted: 07/03/2014] [Indexed: 12/03/2022] Open
Abstract
Objectives Infants with slight/mild or late-onset hearing impairment might be missed in universal newborn hearing screening (UNHS). We identified the mutation hot spot of common deaf gene in the newborns in Jinan area population by screening the mutation spot with neonate cord blood, in order to make clear whether the neonate cord blood for screening is feasible. Methods Six hundred and forty-six newborns were subjected to both UNHS and genetic screening for deafness by using neonate cord blood. The newborn genetic screening targeted four deafness-associated genes, which were commonly found in the Chinese population including gap junction beta-2 protein (GJB2), gap junction beta-3 protein (GJB3), solute carrier family 26 member 4 (SLC26A4), and mtDNA 12S rRNA. The most common 20 spot mutations in 4 deaf genes were detected by MassARRAY iPLEX platform and mitochondrial 12S rRNA A1555G and C1494T mutations were sequenced using Sanger sequencing. Results Among the 646 newborns, 635 cases passed the UNHS and the other 11 cases (1.7%) did not. Of the 11 failures, two cases were found to carry homozygous GJB2 p.R143W pathogenic mutation, one case was found to have heterozygous GJB2 235delC mutation, and another one case carried heterozygous GJB3 p.R180X pathogenic mutation. Six hundred and thirty-five babies passed the newborn hearing screening, in which 25 babies were identified to carry pathogenic mutations, including 12 heterozygotes (1.9%) for GJB2 235delC, eight heterozygotes (1.3%) for SLC26A4 IVS7-2A>G, one heterozygote (0.2%) for p.R409H, two homozygotes (0.3%) for m.1494C>T, and two homozygotes (0.3%) for m.1555A>G. Conclusion Newborn genetic screening through the umbilical cord blood for common deafness-associated mutations may identify carriers sensitive to aminoglycoside antibiotic, and can effectively prevent or delay hearing loss occurs.
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Adhikary B, Ghosh S, Paul S, Bankura B, Pattanayak AK, Biswas S, Maity B, Das M. Spectrum and frequency of GJB2, GJB6 and SLC26A4 gene mutations among nonsyndromic hearing loss patients in eastern part of India. Gene 2015; 573:239-45. [PMID: 26188157 DOI: 10.1016/j.gene.2015.07.050] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2014] [Revised: 07/08/2015] [Accepted: 07/14/2015] [Indexed: 11/16/2022]
Abstract
Genetically caused nonsyndromic hearing loss is highly heterogeneous. Inspite of this large heterogeneity, mutations in the genes GJB2, GJB6 and SLC26A4 are major contributors. The mutation spectrum of these genes varies among different ethnic groups. Only a handful of studies focused on the altered genetic signature of these genes in different demographic regions of India but never focused on the eastern part of the country. Our study for the first time aimed to characterize the mutation profile of these genes in hearing loss patients of West Bengal state, India. Mutations in GJB2, GJB6 and SLC26A4 genes were screened by bidirectional sequencing from 215 congenital nonsyndromic hearing loss patients. Radiological diagnosis was performed in patients with SLC26A4 mutations by temporal bone CT scan. The study revealed that 4.65% and 6.97% patients had monoallelic and biallelic GJB2 mutations respectively. Six mutations were identified, p.W24X being the most frequent one accounting for 71.05% of the mutated alleles. Mutations in GJB6 including the previously identified deletion mutation (GJB6-D13S1830) were not identified in our study. Further, no patients harbored biallelic mutations in the SLC26A4 gene or the common inner ear malformation Enlarged Vestibular Aqueduct (EVA). The mutation profile of GJB2 in our study is distinct from other parts of India, suggesting that the mutation spectrum of this gene varies with ethnicity and geographical origin. The absence of GJB6 mutations and low frequency of SLC26A4 mutations suggest that additional genetic factors may also contribute to this disease.
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Affiliation(s)
- Bidisha Adhikary
- Department of Zoology, University of Calcutta, 35 Ballygunge Circular Road, Kolkata 700 019, West Bengal, India
| | - Sudakshina Ghosh
- Department of Zoology, University of Calcutta, 35 Ballygunge Circular Road, Kolkata 700 019, West Bengal, India
| | - Silpita Paul
- Department of Zoology, University of Calcutta, 35 Ballygunge Circular Road, Kolkata 700 019, West Bengal, India
| | - Biswabandhu Bankura
- Department of Zoology, University of Calcutta, 35 Ballygunge Circular Road, Kolkata 700 019, West Bengal, India
| | - Arup Kumar Pattanayak
- Department of Zoology, University of Calcutta, 35 Ballygunge Circular Road, Kolkata 700 019, West Bengal, India
| | - Subhradev Biswas
- Department of E.N.T., Institute of Post Graduate Medical Education & Research, 244 A J C Bose Road, Kolkata 700 020, West Bengal, India
| | - Biswanath Maity
- Department of Zoology, University of Calcutta, 35 Ballygunge Circular Road, Kolkata 700 019, West Bengal, India
| | - Madhusudan Das
- Department of Zoology, University of Calcutta, 35 Ballygunge Circular Road, Kolkata 700 019, West Bengal, India.
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Duan SH, Zhu YM, Wang YL, Guo YF. Common molecular etiology of nonsyndromic hearing loss in 484 patients of 3 ethnicities in northwest China. Acta Otolaryngol 2015; 135:586-91. [PMID: 25761933 DOI: 10.3109/00016489.2015.1006334] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
CONCLUSIONS In the study population in northwest China, a total of 33.06% of deaf patients have inherited hearing impairment caused by GJB2, SLC26A4, and mtDNA 1555A>G mutations. The mutation frequencies of GJB2, SLC26A4, and mtDNA 1555A>G genes were 16.12%, 10.54%, and 6.4%, respectively, in our study cohort. Thus, screening is conventionally performed for GJB2, SLC26A4, and mtDNA 1555A>G in these populations. OBJECTIVE This study aimed to investigate the mutations of GJB2, mitochondrial DNA 12S rRNA1555A>G, and SLC26A4 genes in Han Chinese, Hui people, and Tibetan ethnicities in patients with nonsyndromic hearing loss (NSHL) in northwest China. METHODS A total of 484 unrelated subjects with hearing loss who attended special education schools in northwest China were enrolled in this study. Three prominent deafness-related genes, GJB2, SLC26A4, and mtDNA 1555A>G, were screened for mutations in our study cohort. RESULTS The mutation frequencies of GJB2, SLC26A4, and mtDNA 1555A>G genes were 16.12%, 10.54%, and 6.4%, respectively. The prevalence of GJB2 mutations was 17.52%, 15.35%, and 11.43% in Han Chinese, Hui people, and Tibetan participants, respectively. c.235delC was the most prevalent mutation, accounting for 65.71% of all GJB2 mutant alleles. The prevalence of SLC26A4 mutations was 12.39%, 8.84%, and 8.57% in Han Chinese, Hui people, and Tibetan participants, respectively. The c.919-2 A>G mutation was the most common form, accounting for 60.47% of all SLC26A4 mutant alleles. The prevalence of the homoplasmic mtDNA 1555A>G mutation was 8.97%, 3.72%, and 5.71% in Han Chinese, Hui people, and Tibetan participants, respectively, which represents a statistically significant difference between the Han Chinese and Hui people (χ(2) = 5.118, p < 0.05).
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Affiliation(s)
- Shi-Hong Duan
- Department of Otolaryngology-Head and Neck Surgery, Second Hospital of Lanzhou University , Lanzhou
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Targeted next-generation sequencing in Uyghur families with non-syndromic sensorineural hearing loss. PLoS One 2015; 10:e0127879. [PMID: 26011067 PMCID: PMC4444116 DOI: 10.1371/journal.pone.0127879] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2014] [Accepted: 04/20/2015] [Indexed: 11/24/2022] Open
Abstract
The mutation spectrum of deafness genes may vary in different ethnical groups. In this study, we investigated the genetic etiology of nonsyndromic deafness in four consanguineous and two multiplex Uyghur families in which mutations in common deafness genes GJB2, SLC26A4 and MT-RNR1 were excluded. Targeted next-generation sequencing of 97 deafness genes was performed in the probands of each family. Novel pathogenic mutations were identified in four probands including the p.L416R/p.A438T compound heterozygous mutations in TMC1, the homozygous p.V1880E mutation in MYO7A, c.1238delT frameshifting deletion in PCDH15 and c.9690+1G>A splice site mutation in MYO15A. Co-segregation of the mutations and the deafness were confirmed within each family by Sanger sequencing. No pathogenic mutations were identified in one multiplex family and one consanguineous family. Our study provided a useful piece of information for the genetic etiology of deafness in Uyghurs.
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Jing W, Zongjie H, Denggang F, Na H, Bin Z, Aifen Z, Xijiang H, Cong Y, Yunping D, Ring HZ, Ring BZ. Mitochondrial mutations associated with aminoglycoside ototoxicity and hearing loss susceptibility identified by meta-analysis. J Med Genet 2014; 52:95-103. [PMID: 25515069 DOI: 10.1136/jmedgenet-2014-102753] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Abstract
BACKGROUND Genetic variations, including mitochondrial mutations, are important contributors to hearing loss, especially in children, and newborn genetic screens for hearing loss mutations are becoming increasingly common. Mitochondrial mutations have been linked with ototoxic responses to common antibiotics, therefore understanding the association of these mutations with hearing loss is of special importance. To address the usefulness of screening for these mutations in a clinical setting, we formed a collaboration of clinicians and geneticists to analyse the association of mitochondrial mutations with non-syndromic hearing loss, including the effect of ethnicity, audiological test methods and aminoglycoside exposure. METHODS This survey identified 122 variants in 43 studies that have been assessed for an association with hearing loss, and meta-analysis was performed on clinically relevant subsets. RNA folding and conservation analysis further explored possible relevance of these variants. RESULTS Among all studies, eight variants were found to have significant associations with hearing loss. A partially overlapping set of six variants had significant association with hearing loss when aminoglycoside exposure was assessed. Five of these variants predictive of sensitivity to aminoglycoside spatially co-localise in an RNA folding model. There was little effect of the audiological test method used to assess hearing loss on the association with the variants. CONCLUSIONS Our results found a small set of studied variants had reproducible association with hearing loss, which will help clarify mutations useful in genetic screens for hearing loss. Several of the aminoglycoside exposure-associated mutations may co-localise on folded 12S rRNA, suggesting a functional association between these loci and aminoglycoside-induced hearing loss.
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Affiliation(s)
- Wu Jing
- Institute of Genomic and Personalized Medicine, College of Life Science and Technology, Huazhong University of Science and Technology, Wuhan, Hubei, China
| | - Hao Zongjie
- Institute of Genomic and Personalized Medicine, College of Life Science and Technology, Huazhong University of Science and Technology, Wuhan, Hubei, China
| | - Fu Denggang
- Institute of Genomic and Personalized Medicine, College of Life Science and Technology, Huazhong University of Science and Technology, Wuhan, Hubei, China
| | - Hei Na
- Institute of Genomic and Personalized Medicine, College of Life Science and Technology, Huazhong University of Science and Technology, Wuhan, Hubei, China
| | - Zhang Bin
- Wuhan Women and Children Hospital, Wuhan, Hubei, China
| | - Zhou Aifen
- Wuhan Women and Children Hospital, Wuhan, Hubei, China
| | - Hu Xijiang
- Wuhan Women and Children Hospital, Wuhan, Hubei, China
| | - Yao Cong
- Wuhan Women and Children Hospital, Wuhan, Hubei, China
| | | | - Huijun Z Ring
- Institute of Genomic and Personalized Medicine, College of Life Science and Technology, Huazhong University of Science and Technology, Wuhan, Hubei, China
| | - Brian Z Ring
- Institute of Genomic and Personalized Medicine, College of Life Science and Technology, Huazhong University of Science and Technology, Wuhan, Hubei, China
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Fan D, Zhu W, Li D, Ji D, Wang P. Identification of a novel homozygous mutation, TMPRSS3: c.535G>A, in a Tibetan family with autosomal recessive non-syndromic hearing loss. PLoS One 2014; 9:e114136. [PMID: 25474651 PMCID: PMC4256404 DOI: 10.1371/journal.pone.0114136] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2014] [Accepted: 11/04/2014] [Indexed: 12/04/2022] Open
Abstract
Different ethnic groups have distinct mutation spectrums associated with inheritable deafness. In order to identify the mutations responsible for congenital hearing loss in the Tibetan population, mutation screening for 98 deafness-related genes by microarray and massively parallel sequencing of captured target exons was conducted in one Tibetan family with familiar hearing loss. A homozygous mutation, TMPRSS3: c.535G>A, was identified in two affected brothers. Both parents are heterozygotes and an unaffected sister carries wild type alleles. The same mutation was not detected in 101 control Tibetan individuals. This missense mutation results in an amino acid change (p.Ala179Thr) at a highly conserved site in the scavenger receptor cysteine rich (SRCR) domain of the TMPRSS3 protein, which is essential for protein-protein interactions. Thus, this mutation likely affects the interactions of this transmembrane protein with extracellular molecules. According to our bioinformatic analyses, the TMPRSS3: c.535G>A mutation might damage protein function and lead to hearing loss. These data suggest that the homozygous mutation TMPRSS3: c.535G>A causes prelingual hearing loss in this Tibetan family. This is the first TMPRSS3 mutation found in the Chinese Tibetan population.
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Affiliation(s)
- Dongyan Fan
- Department of Otolaryngology-Head and Neck Surgery, the First Hospital of Jilin University, Changchun, Jilin Province, China
- Tibet University School of Medicine, Lhasa, China
| | - Wei Zhu
- Department of Otolaryngology-Head and Neck Surgery, the First Hospital of Jilin University, Changchun, Jilin Province, China
| | - Dejun Li
- Center for Prenatal Diagnosis, the First Hospital of Jilin University, Changchun, Jilin Province, China
| | - De Ji
- Tibet University School of Medicine, Lhasa, China
| | - Ping Wang
- Department of Otolaryngology-Head and Neck Surgery, the First Hospital of Jilin University, Changchun, Jilin Province, China
- * E-mail:
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Du W, Cheng J, Ding H, Jiang Z, Guo Y, Yuan H. A rapid method for simultaneous multi-gene mutation screening in children with nonsyndromic hearing loss. Genomics 2014; 104:264-70. [PMID: 25149764 DOI: 10.1016/j.ygeno.2014.07.009] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2014] [Revised: 06/30/2014] [Accepted: 07/17/2014] [Indexed: 11/19/2022]
Abstract
Hearing loss (HL) is a common genetically heterogeneous sensory disorder, occurring in 1 to 3 per 1000 live births. In spite of the extraordinary genetic heterogeneity, variants in GJB2, MT-RNR1, and SLC26A4 genes have been considered as the main reasons of nonsyndromic hearing loss in Chinese population. We developed a rapid multiplex genetic screening system called the SNPscan assay technique which could detect the 115 mutations of the above three genes. This technique is a high-throughput and cost-saving SNP genotyping method. We found that the carrier rate of mutations in the GJB2 gene, MT-RNR1 gene, and SLC26A4 gene was 26.21%, 1.86%, and 25.46% of the patients with nonsyndromic hearing loss, respectively. Using this method, up to 50% of the patients in our study were identified to have hereditary HL caused by mutations in the three genes. It is applicable to not only genetic diagnosis of HL, but also molecular screening of other inherited diseases.
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Affiliation(s)
- Wan Du
- Department of Otolaryngology-Head and Neck Surgery, the Second Hospital of Lanzhou University, Lanzhou, Gansu, People's Republic of China; Department of Otolaryngology-Head and Neck Surgery, Chinese People's Liberation Army Institute of Otolaryngology, Chinese People's Liberation Army General Hospital, Beijing, People's Republic of China
| | - Jing Cheng
- Department of Otolaryngology-Head and Neck Surgery, Chinese People's Liberation Army Institute of Otolaryngology, Chinese People's Liberation Army General Hospital, Beijing, People's Republic of China
| | - Hui Ding
- Department of Urology, the Second Hospital of Lanzhou University, Lanzhou, Gansu, People's Republic of China
| | - Zhengwen Jiang
- Center for Human Genetics Research, Genesky Biotechnologies Inc., Shanghai, People's Republic of China
| | - Yufen Guo
- Department of Otolaryngology-Head and Neck Surgery, the Second Hospital of Lanzhou University, Lanzhou, Gansu, People's Republic of China
| | - Huijun Yuan
- Department of Otolaryngology-Head and Neck Surgery, Chinese People's Liberation Army Institute of Otolaryngology, Chinese People's Liberation Army General Hospital, Beijing, People's Republic of China
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Chen K, Zong L, Liu M, Wang X, Zhou W, Zhan Y, Cao H, Dong C, Tang H, Jiang H. Developing regional genetic counseling for southern Chinese with nonsyndromic hearing impairment: a unique mutational spectrum. J Transl Med 2014; 12:64. [PMID: 24612839 PMCID: PMC3975227 DOI: 10.1186/1479-5876-12-64] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2013] [Accepted: 03/03/2014] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Racial and regional factors are important for the clinical diagnosis of non-syndromic hearing impairment. Comprehensive genetic analysis of deaf patients in different regions of China must be performed to provide effective genetic counseling. To evaluate the mutational spectrum of south Chinese families, we performed genetic analysis for non-syndromic hearing impairment in this population. METHODS Complete clinical evaluations were performed on 701 unrelated patients with non-syndromic hearing impairment from six provinces in south China. Each subject was screened for common mutations, including SLC26A4 c.IVS7-2A > G, c.2168A > G; mitochondrial DNA m.1555A > G, m.1494C > T, m.7444G > A, m.7445A > G; GJB3 c.538C > T, c.547G > A; and WFS1 c.1901A > C, using pyrosequencing. GJB2 and SLC26A4 coding region mutation detection were performed using Sanger sequencing. RESULTS Genetic analysis revealed that among the etiology of non-syndromic hearing impairment, GJB2, SLC26A4, and mitochondrial m.1555A > G mutations accounted for 18.0%, 13.1%, and 0.9%, respectively. Common mutations included GJB2 c.235delC, c.109G > A, SLC26A4 c.IVS7-2A > G, c.1229 T > C, and mitochondrial m.1555A > G. The total mutation rate was 45.1% in all patients examined in south China. Overall, the clear contribution of GJB2, SLC26A4, and mitochondrial m.1555A > G to the etiology of the non-syndromic deafness population in south China was 32.0%. CONCLUSIONS Our study is the first genetic analysis of non-syndromic hearing impairment in south China, and revealed that a clear genetic etiology accounted for 32.0% of non-syndromic hearing cases in patients from these regions. The mutational spectrum of non-syndromic hearing impairment in the south Chinese population provides useful and targeted information to aid in genetic counseling.
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Affiliation(s)
- Kaitian Chen
- Department of Otorhinolaryngology, the First Affiliated Hospital, Sun Yat-sen University and Institute of Otorhinolaryngology, Sun Yat-sen University, Guangzhou 510080, People's Republic of China
| | - Ling Zong
- Department of Otorhinolaryngology, the First Affiliated Hospital, Sun Yat-sen University and Institute of Otorhinolaryngology, Sun Yat-sen University, Guangzhou 510080, People's Republic of China
| | - Min Liu
- Department of Otorhinolaryngology, the First Affiliated Hospital, Sun Yat-sen University and Institute of Otorhinolaryngology, Sun Yat-sen University, Guangzhou 510080, People's Republic of China
| | - Xianren Wang
- Department of Otorhinolaryngology, the First Affiliated Hospital, Sun Yat-sen University and Institute of Otorhinolaryngology, Sun Yat-sen University, Guangzhou 510080, People's Republic of China
| | - Wei Zhou
- Department of Otorhinolaryngology, the First Affiliated Hospital, Sun Yat-sen University and Institute of Otorhinolaryngology, Sun Yat-sen University, Guangzhou 510080, People's Republic of China
| | - Yuan Zhan
- Department of Otorhinolaryngology, the First Affiliated Hospital, Sun Yat-sen University and Institute of Otorhinolaryngology, Sun Yat-sen University, Guangzhou 510080, People's Republic of China
| | - Hui Cao
- Department of Otorhinolaryngology, the First Affiliated Hospital, Sun Yat-sen University and Institute of Otorhinolaryngology, Sun Yat-sen University, Guangzhou 510080, People's Republic of China
| | - Chang Dong
- Department of Otorhinolaryngology, the First Affiliated Hospital, Sun Yat-sen University and Institute of Otorhinolaryngology, Sun Yat-sen University, Guangzhou 510080, People's Republic of China
| | - Haocheng Tang
- Department of Otorhinolaryngology, the First Affiliated Hospital, Sun Yat-sen University and Institute of Otorhinolaryngology, Sun Yat-sen University, Guangzhou 510080, People's Republic of China
| | - Hongyan Jiang
- Department of Otorhinolaryngology, the First Affiliated Hospital, Sun Yat-sen University and Institute of Otorhinolaryngology, Sun Yat-sen University, Guangzhou 510080, People's Republic of China
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Xin F, Yuan Y, Deng X, Han M, Wang G, Zhao J, Gao X, Liu J, Yu F, Han D, Dai P. Genetic mutations in nonsyndromic deafness patients of Chinese minority and Han ethnicities in Yunnan, China. J Transl Med 2013; 11:312. [PMID: 24341454 PMCID: PMC3878508 DOI: 10.1186/1479-5876-11-312] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2013] [Accepted: 12/11/2013] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Each year in China, 30,000 babies are born with congenital hearing impairment. However, the molecular etiology of hearing impairment in the Yunnan Province population where more than 52 minorities live has not been thoroughly investigated. To provide appropriate genetic testing and counseling to these families, we investigated the molecular etiology of nonsyndromic deafness in this population. METHODS Unrelated students with hearing loss (n = 235) who attended Kunming Huaxia secondary specialized school in Yunnan enrolled in this study. Three prominent deafness-related genes, GJB2, SLC26A4 and mtDNA 12S rRNA, were analyzed. High-resolution temporal bone computed tomography (CT) scan examinations were performed in 100 cases, including 16 cases with SLC26A4 gene variants, and 37 minorities and 47 Han cases without any SLC26A4 gene mutation. RESULTS The GJB2 mutation was detected in 16.67% (7/42) of minority patients and 17.62% (34/193) of Chinese Han patients (P > 0.05). 235delC was the hotspot mutation in nonsyndromic hearing loss (NSHL) patients, whereas 35delG was not found. The 431_450del19 mutation was detected for the first time in Han NSHL patients, which resulted in a premature stop codon and changed the protein. The SLC26A4 mutation was found in 9.52% (4/42) of minority patients and 9.84% (19/193) of Han Chinese patients (P > 0.05). The frequencies of mtDNA 12S rRNA mutation in minority and Han Chinese patients were 11.90% (5/42) and 7.77% (15/193; P > 0.05), respectively. Sixteen (16/23, 69.57%) patients with SLC26A4 mutations received temporal bone CT scan, and 14 patients were diagnosed with enlarged vestibular aqueducts (EVAs); the other 2 patients had normal inner ear development. The ratio of EVA in the minorities was 14.63% (6/41). CONCLUSIONS In this study, a total of 35.74% deaf patients showed evidence of genetic involvement, based on either genetic screening or family history; 17.45%, 9.79%, and 8.51% of the patients were determined to have inherited hearing impairment caused by GJB2, SLC26A4, and mtDNA 1555A > G mutations. There was no significant difference in deafness associated gene mutational spectrum and frequency between the Yunnan minority and Han patients.
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Affiliation(s)
| | | | | | | | | | | | | | | | | | | | - Pu Dai
- Department of Otolaryngology and Genetic Testing Center for Deafness, Chinese PLA General Hospital, Beijing 100853, P,R, China.
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21
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Chan DK, Chang KW. GJB2-associated hearing loss: Systematic review of worldwide prevalence, genotype, and auditory phenotype. Laryngoscope 2013; 124:E34-53. [DOI: 10.1002/lary.24332] [Citation(s) in RCA: 183] [Impact Index Per Article: 16.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 07/10/2013] [Indexed: 12/17/2022]
Affiliation(s)
- Dylan K. Chan
- Department of Otolaryngology-Head and Neck Surgery; University of California; San Francisco U.S.A
| | - Kay W. Chang
- Department of Otolaryngology-Head and Neck Surgery; Stanford University School of Medicine; Stanford California U.S.A
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22
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Yang XL, Bai-Cheng X, Chen XJ, Pan-Pan B, Jian-Li M, Xiao-Wen L, Zhang ZW, Wan D, Zhu YM, Guo YF. Common molecular etiology of patients with nonsyndromic hearing loss in Tibetan, Tu nationality, and Mongolian patients in the northwest of China. Acta Otolaryngol 2013; 133:930-4. [PMID: 23834103 DOI: 10.3109/00016489.2013.795288] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
CONCLUSION In the northwest of China, the prevalence of mutations of the three prominent deafness-related genes, GJB2, SLC26A4, and mitochondrial DNA (mtDNA) 12S rRNA, among Tibetan, Tu nationality, and Mongolian subjects is high, at 19%, 28.57%, and 21.05%, respectively. Molecular genetic screening for these mutations and genetic counseling are effective methods to prevent the occurrence of hereditary hearing loss. OBJECTIVE To analyze the prevalence of the three common deafness genes GJB2, mtDNA, and SLC26A4 gene mutations in Tibetan, Tu nationality, and Mongolian patients with nonsyndromic hearing impairment in the Northwest region of China. METHODS Genomic DNA was extracted from a total of 189 Tibetan, Tu nationality, and Mongolian probands from the northwest of China. PCR and direct sequencing were used to analyze the coding region of GJB2, mtDNA, and SLC26A4 genes. RESULTS The mutant allele rate of GJB2 gene was 6.2% in Tibetan and 11.22% in Tu nationality patients, c.235delC was the most prevalent mutation, accounting for 75% of the mutant GJB2 alleles. Mutant allele frequency of SLC26A4 in Tibetan, Tu nationality, and Mongolian subjects was 4.54%, 6.12%, and 15.79% respectively; p.IVS7-2A>G was the most common form. Mongolian cases were significantly higher than Tibetan cases (χ² = 7.281, p = 0.007 and p < 0.05). mtDNA A1555G mutation was detected in six Tibetan, five Tu nationality, and one Mongolian subject; one Tibetan patient carried the C1494T mutation.
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Yuan Y, Guo W, Tang J, Zhang G, Wang G, Han M, Zhang X, Yang S, He DZZ, Dai P. Molecular epidemiology and functional assessment of novel allelic variants of SLC26A4 in non-syndromic hearing loss patients with enlarged vestibular aqueduct in China. PLoS One 2012. [PMID: 23185506 PMCID: PMC3503781 DOI: 10.1371/journal.pone.0049984] [Citation(s) in RCA: 62] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
Abstract
Background Mutations in SLC26A4, which encodes pendrin, are a common cause of deafness. SLC26A4 mutations are responsible for Pendred syndrome and non-syndromic enlarged vestibular aqueduct (EVA). The mutation spectrum of SLC26A4 varies widely among ethnic groups. To investigate the incidence of EVA in Chinese population and to provide appropriate genetic testing and counseling to patients with SLC26A4 variants, we conducted a large-scale molecular epidemiological survey of SLC26A4. Methods A total of 2352 unrelated non-syndromic hearing loss patients from 27 different regions of China were included. Hot spot regions of SLC26A4, exons 8, 10 and 19 were sequenced. For patients with one allelic variant in the hot spot regions, the other exons were sequenced one by one until two mutant alleles had been identified. Patients with SLC26A4 variants were then examined by temporal bone computed tomography scan for radiological diagnosis of EVA. Ten SLC26A4 variants were cloned for functional study. Confocal microscopy and radioisotope techniques were used to examine the membrane expression of pendrin and transporter function. Results Of the 86 types of variants found, 47 have never been reported. The ratio of EVA in the Chinese deaf population was at least 11%, and that in patients of Han ethnicity reached at least 13%. The mutational spectrum and mutation detection rate of SLC26A4 are distinct among both ethnicities and regions of Mainland China. Most of the variants caused retention of pendrin in the intracellular region. All the mutant pendrins showed significantly reduced transport capability. Conclusion An overall description of the molecular epidemiological findings of SLC26A4 in China is provided. The functional assessment procedure can be applied to identification of pathogenicity of variants. These findings are valuable for genetic diagnosis, genetic counseling, prenatal testing and pre-implantation diagnosis in EVA families.
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Affiliation(s)
- Yongyi Yuan
- Department of Otolaryngology, Chinese PLA General Hospital, Beijing, People’s Republic of China
- Department of Otolaryngology, Hainan Branch of Chinese PLA General Hospital, Sanya, People’s Republic of China
| | - Weiwei Guo
- Department of Otolaryngology, Chinese PLA General Hospital, Beijing, People’s Republic of China
| | - Jie Tang
- Department of Biomedical Sciences, Creighton University School of Medicine, Omaha, Nebraska, United States of America
| | - Guozheng Zhang
- Department of Otolaryngology, 3rd hospital of Hebei Medical University, Shijiazhuang, Hebei Province, People’s Republic of China
| | - Guojian Wang
- Department of Otolaryngology, Chinese PLA General Hospital, Beijing, People’s Republic of China
- Department of Otolaryngology, Hainan Branch of Chinese PLA General Hospital, Sanya, People’s Republic of China
| | - Mingyu Han
- Department of Otolaryngology, Chinese PLA General Hospital, Beijing, People’s Republic of China
- Department of Otolaryngology, Hainan Branch of Chinese PLA General Hospital, Sanya, People’s Republic of China
| | - Xun Zhang
- Department of Otolaryngology, 3rd hospital of Hebei Medical University, Shijiazhuang, Hebei Province, People’s Republic of China
| | - Shiming Yang
- Department of Otolaryngology, Chinese PLA General Hospital, Beijing, People’s Republic of China
- * E-mail: (PD); (SY); (DZZH)
| | - David Z. Z. He
- Department of Biomedical Sciences, Creighton University School of Medicine, Omaha, Nebraska, United States of America
- * E-mail: (PD); (SY); (DZZH)
| | - Pu Dai
- Department of Otolaryngology, Chinese PLA General Hospital, Beijing, People’s Republic of China
- Department of Otolaryngology, Hainan Branch of Chinese PLA General Hospital, Sanya, People’s Republic of China
- * E-mail: (PD); (SY); (DZZH)
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