Genes implicated in retinitis pigmentosa (RP) and related photoreceptor disorders, including Alström syndrome, Bardet-Biedl syndrome (BBS), cone/cone-rod dystrophy (CD/CRD), congenital stationary night blindness (CSNB), Joubert syndrome (JBS), Leber congenital amaurosis (LCA), Senior-Loken syndrome/nephronophthisis (SLS/NPHP), and Usher syndrome (US). Mapped genetic loci without an identified gene are indicated with an asterisk (*).