ABCA4 and retinitis pigmentosa 1: Molecular analyses revealed that mutations in two different genes were implicated: ABCA4 and CRB1. The STGD patient carried the homozygous p.Asn1805Asp allele in the ABCA4 gene, while the RP patient had the disease-associated alleles p.Cys948Tyr and p.Trp822ter cosegregating in the CRB1 gene.