GJB2 and deafness: In previous studies, nine hotspot mutations in GJB2, SLC26A4, MT-RNR1 and GJB3 were identified in 32.45% of Chinese Han deaf patients but only in 13.06% of Uyghur deaf patients in Xinjiang, indicating that those two ethnicities differed substantially in the mutation spectrum of the common deafness genes [6].