GJB2 and hearing loss disorder: It was also revealed that the types of genes differed in the groups according to severity; i.e., GJB2, SLC26A4, and CDH23 were more commonly found in the severe-to-profound hearing loss group, while GJB2, STRC, KCNQ4, WFS1, MYO7A, and MYO6 were found to be more common in the mild-to-moderate hearing loss group (Fig. 2C).