Recent comprehensive next‐generation sequencing (NGS) analysis has helped clarify genetic epidemiology; i.e., GJB2 is the predominant deafness‐causing gene, with the other common genes being CDH23, SLC26A4, MYO15A, COL11A2, and MYO7A (Miyagawa et al., 2013; Nishio and Usami, 2015) (Fig. 4). This evidence concerns the gene GJB2 and deafness.