PRPH2 and retinitis pigmentosa 1: Several causative genes have been associated with AD-RP, including RHO, PRPF31, PRPH2, RP1, IMPDH1, PRPF8, NR2E3, snRNP200, KLHL7, CRX, PRPF3, TOPORS, ADIPOR1, ARL3, CA4, FSCN2, GUCA1B, HK1, IMPG1, KIF3B, NRL, PRPF4, PRPF6, RDH12, ROM1, RP9, SEMA4A, SPP2, and many others [6].