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- W3108546090 abstract "Introduction: Congenital hearing loss is the most common sensory deficit in the world and mutations in GJB2 gene are the most common cause of deafness in many populations. Frequency of GJB2 mutations is estimated about 16% in Iran and varies among different provinces with a decreasing trend from north to south. The aim of this study was to investigate the frequency of GJB2 mutations in Mazandaran province, north of Iran, among non-syndromic hearing loss patients. Methods: 262 patients from 204 families participated in this study. After genomic DNA extraction, GJB2 gene analysis was carried out using DNA sequencing of both coding and non-coding regions by ABI 3130XL genetic analyzer. Results: 30.15% of all subjects showed mutations in GJB2 gene. Four mutations, including c.35delG (Gly12Valfs*), IVSI-1 + 1G > A, c.95G > A (Arg32His) and c.224 G > A (Arg75Gln) comprises 69.89% of all mutations in this study c.35delG and IVSI-1 were the most common mutations among patients respectively. Codon 75 mutation (c.224G > A. p: Arg75Gln) with autosomal dominant inheritance was seen in 7 cases from 3 families. 22 patients showed only one mutation in GJB2 gene and in 126 (48.09%) individuals, parents had a consanguineous marriage. Discussion: Frequency of GJB2 gene related hearing loss among patients was higher than average (16%) in this province. This study also showed a dominant inheritance pattern of GJB2 gene in this area. Consanguineous marriage also showed highly frequent among parents. More investigation needs to clarify cause of hearing loss in those 22 patients with one mutation in GJB2 gene, either two gene inheritance or another gene may be responsible for hearing loss." @default.
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- W3108546090 date "2020-01-01" @default.
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- W3108546090 title "<i>GJB2</i> Gene Related Nonsyndromic Hearing Loss in Mazandaran Province, North of Iran" @default.
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- W3108546090 doi "https://doi.org/10.4236/ojgen.2020.103005" @default.
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