TULP1 and retinitis pigmentosa: Biallelic mutations in tubby like protein 1 gene (TULP1) are responsible for rare forms of early onset, severe, autosomal recessive retinal degenerations, typically registered as retinitis pigmentosa 14 (RP14) or Leber congenital amaurosis 15 (LCA15) (Hagstrom et al., 1998; Mataftsi et al., 2007; Jacobson et al., 2014; RetNet - Retinal Information Network, 2019).