NR4A2 and deafness: Additionally, 33 infants (0.307 %) had the MT-RNR1 variant (m.1555A>G or m.1494C>T), all of whom passed the hearing screening.<h4>Conclusions</h4>The most prevalent mutations associated with deafness were identified as GJB2 c.235delC, SLC26A4 IVS7-2 A>G, and m.1555A>G.