CAND2 (cullin-associated NEDD8-dissociated protein 2) functions as an F-box protein exchange factor that regulates SCF (SKP1-CUL1-F-box) ubiquitin ligase complex dynamics 1. While structurally similar to its homolog CAND1, CAND2 exhibits lower efficiency in exchanging F-box proteins within SCF complexes due to higher kinetic barriers to F-box protein dissociation 1. This catalytic difference suggests specialized roles in cellular protein degradation networks. Beyond SCF regulation, CAND2 has emerged as a disease-relevant locus through multiple genetic studies. A novel obesity susceptibility gene identified via chr3 regulatory analysis, CAND2 expression is downregulated during adipocyte differentiation, and mouse models show associations with increased lean body mass and decreased fat 2. In cardiac pathology, muscle-specific CAND2 is translationally upregulated by mTORC1 signaling and promotes adverse cardiac remodeling by increasing GRK5 protein expression; CAND2 deletion protects against pathological remodeling 3. Additionally, CAND2 variants (rs4642101) are associated with atrial fibrillation susceptibility across multiple populations 4, 5, with functional evidence showing zebrafish knockdown prolongs atrial action potential duration 4. The pleiotropic effects of CAND2 suggest its importance in metabolic and cardiac homeostasis.