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Comprehensive genetic testing has the potential to become the standard of care for individuals with hearing loss. In this study, we investigated the genetic etiology of autosomal recessive nonsyndromic hearing loss (ARNSHL) in a Turkish cohort including individuals with cochlear implant, who had a pedigree suggestive of an autosomal recessive inheritance. A workflow including prescreening of  GJB2  and a targeted next generation sequencing panel (Illumına TruSight TM  Exome) covering 2761 genes that we briefly called as mendelian exome sequencing was used. This panel includes 102 deafness genes and a number of genes causing Mendelian disorders. Using this approach, we identified causative variants in 21 of 29 families. Three different  GJB2  variants were present in seven families. Remaining 14 families had 15 different variants in other known NSHL genes ( MYO7A ,  MYO15A ,  MARVELD2 ,  TMIE ,  DFNB31 ,  LOXHD1 ,  GPSM2 ,  TMC1 ,  USH1G ,  CDH23) . Of these variants, eight are novel. Mutation detection rate of our workflow is 72.4%, confirming the usefulness of targeted sequencing approach in NSHL.

Comprehensive Analysis of Deafness Genes in Families with Autosomal Recessive Nonsyndromic Hearing Loss