Hormonal
Loss of Bardet-Biedl syndrome (BBS) proteins causes leptin resistance and obesity by disrupting the physical interaction between BBS1 and the leptin receptor (LepRb), leading to defective intracellular trafficking and attenuated hypothalamic signaling.
This research identifies a specific biological mechanism where genetic defects prevent the brain from properly processing the 'fullness' signal (leptin) from fat cells. For individuals with Bardet-Biedl Syndrome or similar genetic variants affecting ciliary function, standard weight loss advice may fail because the body's internal signaling hardware is broken, not just the caloric balance. Future treatments may need to target the trafficking of the leptin receptor itself rather than just focusing on calorie intake.
Our data indicate that BBS proteins mediate LepR trafficking and that impaired LepR signaling underlies energy imbalance in BBS. These findings represent a novel mechanism for leptin resistance and obesity.
Why this rating
High-quality mechanistic evidence using multiple knockout mouse models (Bbs2, Bbs4, Bbs6) and in vitro assays, though findings are preclinical (mouse models).
Source
Requirement of Bardet-Biedl syndrome proteins for leptin receptor signaling
Seongjin Seo et al. · Human Molecular Genetics · 2009
DOI 10.1093/hmg/ddp031
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