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Background  The genetic basis of autosomal dominant nonsyndromic hearing loss is complex. Genetic factors are responsible for approximately 50% of cases with congenital hearing loss. However, no previous studies have documented the clinical phenotype and genetic basis of autosomal dominant nonsyndromic hearing loss in Mongolians.    Methods  In this study, we performed exon capture sequencing of a Mongolian family with hereditary hearing loss and identified a novel mutation in  TECTA  gene, which encodes α -tectorin, a major component of the inner ear extracellular matrix that contacts the specialized sensory hair cells.    Results  The novel G → T missense mutation at nucleotide 6016 results in a substitution of amino acid aspartate at 2006 with tyrosine (Asp2006Tyr) in a highly conserved zona pellucida (ZP) domain of α-tectorin. The mutation is not found in control subjects from the same family with normal hearing and a genotype-phenotype correlation is observed.    Conclusion  A novel missense mutation c.6016 G > T (p.Asp2006Tyr) of  TECTA  gene is a characteristic  TECTA -related mutation which causes autosomal dominant nonsyndromic hearing loss. Our result indicated that mutation in  TECTA  gene is responsible for the hearing loss in this Mongolian family.

A rare novel mutation in TECTA causes autosomal dominant nonsyndromic hearing loss in a Mongolian family