PDE6A and retinitis pigmentosa 1: In the examination of all 75 RP disease-causing genes, we found an enrichment of the phototransduction (Cnga1, Cngb3, Guca1b, Pde6a, Pde6b, Rho, Sag) and rod retinoid pathway genes (Abca4, Lrat, Rdh12, Rbp3, Rlbp1, Rpe65) (Table 4).