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Mutations in CDH23 are known to cause autosomal‐recessive nonsyndromic hearing loss (DFNB12). Until now, there was only one study describing its frequency in Indian population. We screened for CDH23 mutations to identify prevalent and recurring mutations among South Indian assortative mating hearing‐impaired individuals who were identified as non‐DFNB1 (GJB2 and GJB6). Whole‐exome sequencing was performed in individuals found to be heterozygous for CDH23 to determine whether there was a second pathogenic allele. In our study, 19 variants including 6 pathogenic missense mutations were identified. The allelic frequency of pathogenic mutations accounts to 4.7% in our cohort, which is higher than that reported previously; three mutations (c.429+4G>A, c.2968G>A, and c.5660C>T) reported in the previous Indian study were found to recur. DFNB12 was found to be the etiology in 3.4% of our cohort, with missense mutation c.2968G>A (p.Asp990Asn) being the most prevalent (2.6%). These results suggest a need to investigate the possibility for higher proportion of CDH23 mutations in the South Indian hearing‐impaired population.
Annals of Human Genetics – Wiley
Published: Jan 1, 2018
Keywords: ; ; ; ; ; ;
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