SNRNP200 and retinitis pigmentosa 1: Mutations in PRPF8 and PRPF31 each account for roughly 2% of cases of RP, PRPF3 mutations account for around 1% of cases (Sullivan et al., 2006), and SNRNP200 mutations are found in 1.6% of autosomal dominant RP patients (Bowne et al., 2013).