Mutations in nine deafness genes (COCH, KCNQ4, MYO7A, TECTA, CRYM, POU3F4, EYA1, mitochondrial tRNA(Lys) m.8296A>G, mitochondrial tRNA(Ser) m.7445A>G) were not identified in any patients (Table 2). Here, POU3F4 is linked to deafness.