Bardet-Biedl syndrome 1 protein (BBS1) (BBS1)

Bardet-Biedl syndrome 1 protein (BBS1) is a core component of the BBSome, a stable octameric complex that functions as a cargo adapter for the intraflagellar transport (IFT) machinery, facilitating the trafficking of membrane proteins into and out of the primary cilium (UniProt P62120). It is particularly critical for the ciliary localization of G protein-coupled receptors (GPCRs) involved in metabolic regulation, such as the leptin receptor and the melanocortin-4 receptor (MC4R) (PubMed: 22307328). Mutations in the BBS1 gene are the most frequent cause of Bardet-Biedl syndrome (BBS), a multisystemic ciliopathy characterized by obesity, retinal degeneration, polydactyly, and renal dysfunction (NIH: GARD). While BBS1 is primarily a target for emerging gene replacement therapies, its role in the MC4R pathway makes it clinically relevant to the use of setmelanotide, an MC4R agonist approved for chronic weight management in patients with BBS (FDA: Setmelanotide Approval). Therapeutic strategies focus on restoring the BBSome's ability to transport signaling molecules, thereby addressing the underlying cellular defects of the syndrome. Understanding the structural role of BBS1 within the BBSome is vital for developing precision medicine approaches for various ciliopathies.

Other names

Bardet-Biedl syndrome 1BBS1 proteinBBS1

Restoration of BBSome-mediated ciliary trafficking and downstream MC4R signaling pathway activation.