RPGR and retinitis pigmentosa 1: In fact, just four female carriers suffered from bilateral myopic chorioretinal degenerations but all of them were heterozygous for ORF15-c.2091_2092insA, indicating that PM could represent the phenotypic expression of RP-related mutant heterozygosities located in various exons of RPGR gene, as previously observed in several pedigrees of both Asian and Caucasian descents20, 21, 22, 23, 24, 25, 26, 27, 28.