Bardet-Biedl syndrome bardet-biedl syndrome 21 https://github.com/monarch-initiative/mondo/issues/8986 https://www.malacards.org/card/bardet_biedl_syndrome_21 MONDO:0044308 BBS21 is an autosomal recessive ciliopathy characterized by obesity, postaxial polydactyly, retinal degeneration, and mild cognitive impairment ({1:Heon et al., 2016}; {2:Khan et al., 2016}).nnFor a general phenotypic description and a discussion of genetic heterogeneity of Bardet-Biedl syndrome, see BBS1 (OMIM:209900). MEDGEN:1374358 DOID:0081010 GARD:0016226 OMIM:617406 BBS21 UMLS:C4319932 CFAP418-related ciliopathy