SLC26A4 and deafness: SLC26A4 mutations are the second-most common cause of deafness in China22, 23, 24, 25, and there was 88.4% of EVA-positive patients detected with biallelic variants of SLC26A4, 9.5% with monoallelic mutations and 2.1% with no mutant alleles, and IVS7-2A>G mutation was identified as the most common form accounting for 57.63% of the mutant alleles19, 20.