We analyzed the variability of the GJB2 gene sequence based on the data from the Deafness Variation Database (the DVD v9 version: https://deafnessvariationdatabase.org/, accessed on 1 June 2023) [83], which includes all known genetic variants presented in 223 deafness-associated (non-syndromic and syndromic) genes. Here, GJB2 is linked to deafness.