Genetic mutations in nonsyndromic deafness patients of Chinese minority and han ethnicities in Yunnan, China

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• 作者：Feng Xin (1)
  Yongyi Yuan (1)
  Xiaoming Deng (3)
  Mingyu Han (1) (2)
  Guojian Wang (1) (2)
  Jiandong Zhao (1)
  Xue Gao (4)
  Jun Liu (1)
  Fei Yu (1)
  Dongyi Han (1)
  Pu Dai (1) (2)
  
• 关键词：Genetic mutations ; Nonsyndromic deafness ; Minority ; Han ; Yunnan
• 刊名：Journal of Translational Medicine
• 出版年：2013
• 出版时间：December 2013
• 年：2013
• 卷：11
• 期：1
• 全文大小：211 KB
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• 作者单位：Feng Xin (1)
  Yongyi Yuan (1)
  Xiaoming Deng (3)
  Mingyu Han (1) (2)
  Guojian Wang (1) (2)
  Jiandong Zhao (1)
  Xue Gao (4)
  Jun Liu (1)
  Fei Yu (1)
  Dongyi Han (1)
  Pu Dai (1) (2)
  
  1. Department of Otolaryngology and Genetic Testing Center for Deafness, Chinese PLA General Hospital, Beijing, 100853, P.R. China
  3. Department of Otorhinolaryngology, First Hospital, Yunnan, 650032, P.R. China
  2. Department of Otorhinolaryngology, Hainan Branch of PLA General Hospital, Sanya, P.R. China
  4. Department of Otolaryngology, The Second Artillery General Hospital, 16# Xin Wai Da Jie, Beijing, 100088, P.R. China
  
• ISSN：1479-5876

文摘

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--35) 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-gt;-.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-gt;-.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-gt;-.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-gt;?G mutations. There was no significant difference in deafness associated gene mutational spectrum and frequency between the Yunnan minority and Han patients.