Finally, NKCC1 exon 21 variants are linked to hearing impairment (Glu979Lys, Glu980Val, Glu980Lys) and hearing loss (Asp981Tyr, Pro988Ser, Pro988Thr, and 2930-2A > G) (Morgan et al., 2020; Mutai et al., 2020; Adadey et al., 2021; Koumangoye et al., 2021; Vanniya et al., 2022). Here, SLC12A2 is linked to hearing loss disorder.