For example, in typical areas of China (Chifeng City in Inner Mongolia and Nangtong City in JiangSu Province), GJB2 gene mutations account for the etiology of approximately 18.31% of patients with hearing loss, SLC26A4 mutations account for approximately 13.73%, and the mitochondrial m.1555A > G mutation accounts for 1.76% [7]. Here, GJB2 is linked to hearing loss disorder.