USH2A and deafness: The most frequent causative gene revealed by this technology was CDH23 (n = 3), followed by MYO15A (n = 2), MYO7A (n = 2) and other four deafness genes (PCDH15 (n = 1), USH2A (n = 1), MYO3A (n = 1) and ACTG1 (n = 1)) (Table 3).