Abstract
Screening for MYO15A mutations was carried out using a large cohort to clarify the frequency and clinical characteristics of patients with MYO15A (DFNB3) mutations in a hearing loss population. Genetic analysis of 63 previously reported deafness genes based on massively parallel DNA sequencing (MPS) in 1120 Japanese hearing loss patients from 53 otorhinolaryngology departments was performed. Detailed clinical features of the patients with MYO15A mutations were then collected and analyzed. Eleven patients from 10 families were found to have compound heterozygosity for MYO15A. Audiograms showed profound or high frequency hearing loss, with some patients showing progressive hearing loss. Age at onset was found to vary from 0 to 14 years, which seemed to be associated with the mutation. Four children underwent bilateral cochlear implantation for congenital hearing loss, with all showing good results. Mutations in the MYO15A gene are a notable cause of nonsyndromic hearing loss. MPS technology successfully detected mutations in relatively rare deafness genes such as MYO15A.
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