SAG and retinitis pigmentosa 1: Mutations in BBS2, BBS4, BBS5, BBS7, BBS9, BBS17, and BBS18 all result in an RP phenotype due to a loss of ciliary formation and/or mislocalization of photoreceptor proteins, including RHO and arrestin-1 [116,119,120,121,122,123,124,125,126,127,128,129,130].