BBS2 and Bardet-Biedl syndrome: This narrowed the scope of the genetic search from all genes associated with autosomal recessive RP (i.e., 30 non-syndromic and > 27 syndromic) [26,27] to BBS-associated genes (n = 16), of which two (i.e., BBS1 and BBS10) explain 45% of BBS cases [28].