TULP1 and retinitis pigmentosa: Mutations in tubby like protein 1 gene (TULP1) are causative of rare, early onset, severe forms of autosomal recessive retinal degeneration, usually diagnosed as Leber congenital amaurosis 15 (LCA15) or retinitis pigmentosa 14 (RP14) (RetNet - Retinal Information Network, 2019).