USH2A and retinitis pigmentosa: Another cytosine to adenine substitution, i.e., c.1560C>A (p.Cys520*) in USH2A identified in family RP 105 in this study, was also reported previously in the Spanish population by González-del Pozo et al.in 2018 as a heterozygous allele in a non-syndromic retinitis pigmentosa patient along with another heterozygous variant c.2276G>T: p.Cys759Phe.