POU3F4 and deafness: To date, over 80 deafness‐causative mutations in the coding sequence of POU3F4 have been identified in some 20 countries, including missense, nonsense, deletion, frameshift, and extension mutations (Figure 1).6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46