GJB2 and deafness: Another study used a comprehensive deafness gene panel (including 50 non-syndromic and 7 non-syndromic/syndromic deafness genes) to screen 125 deaf probands without common mutations in GJB2, SLC26A4, or MT-RNR1, and found potentially causative mutations in 26.4% (33/125) of the patients [17].