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Genetic epidemiology based on comprehensive NGS analysis results. GJB2 is the most prevalent causative gene, and the major (commonly found) gene mutations in GJB2 cause deafness in 30%–40% of cases. The remaining cases of hearing loss are the result of various rare genes/mutations that have been difficult to diagnose by the conventional one‐by‐one approach (Nishio and Usami, 2015).
