Update of the Spectrum of GJB2 Mutations in 107 Patients with Nonsyndromic Hearing Loss in the Fujian Population of China. (20th March 2014)

• Record Type: Journal Article
• Authors: Chen, Tianbin; Jiang, Ling; Liu, Can; Shan, Hongyan; Chen, Jing; Yang, Bin; Ou, Qishui
• Is Part Of: Annals of human genetics. Volume 78:Number 3(2014:May)
• Page Start: 235
• Page End: 242
• Publication Date: 2014-03-20
• Subjects: Human genetics -- Periodicals; 599.935
• DOI: 10.1111/ahg.12062
• Languages: English
• ISSNs: 0003-4800

Abstract

<abstract abstract-type="main"> <title>Summary</title> <p>Mutations in the <italic>GJB2</italic> gene, encoding connexin26, which is expressed in the inner ear, have been shown to be responsible for the majority of nonsyndromic hearing loss (NSHL) cases. To update and evaluate the spectrum and prevalence of <italic>GJB2</italic> mutations in the Fujian population, we screened exon 2 (coding), exon 1, and flanking introns of <italic>GJB2</italic> in 107 NSHL probands and 61 individuals with normal hearing. Twelve different variants were identified, including three pathogenic mutations (c.235delC, c.299_300delAT, and c.508insAACG), one hypomorphic allele (p.V37I), three polymorphic variants (p.V27I, p.E114G, and p.I230T), and five rare variants (p.N62N, p.F115C, p.T123N, p.G21E, and p.F142I). The p.G21E and p.F142I variants were potentially pathogenic as predicted by PolyPhen‐2, SIFT, and PROVEAN. The most common mutation was c.235delC with allele frequency 12.6% (27/214). The most common polymorphisms in the Fujian population were p.V27I and p.E114G, both detected at high frequency in probands and controls. The p.E114G variant was always in <italic>cis</italic> with p.V27I, and formed the haplotype, p.[V27I; E114G] in the Fujian population. Interestingly, only 17.76% (19/107) of NSHL probands had clearly defined pathogenic mutations in <italic>GJB2</italic>, indicating that the pathogenesis of NSHL in the Fujian population is heterogenous, and that further analysis of other NSHL genes is necessary.</p> </abstract>