RPGRIP1 and Leber congenital amaurosis: In an Italian study on 24 LCA patients [42], the most common genes were found to be CRB1 (7%), CEP290, IQCB1, and GUCY2D (each 5%), while only single families with variants in NMNAT1, TULP1, AIPL1, SPATA7, and RPGRIP1 were identified.