BOLA2 (bolA family member 2) is a cytosolic iron-sulfur cluster assembly protein that plays a critical role in cellular iron homeostasis. Mechanistically, BOLA2 functions as part of a [2Fe-2S] cluster chaperone complex with glutaredoxin 3 (Glrx3), forming heterotrimeric complexes that coordinate and transfer iron-sulfur clusters to target proteins in cytosolic iron-sulfur protein maturation pathways 1. BOLA2 also interacts with PCBP1 (poly(rC)-binding protein 1), which delivers ferrous iron coordinated with glutathione to enable [2Fe-2S] cluster assembly 2. This iron-sensing function is evolutionarily significant: BOLA2 underwent human-specific duplication approximately 282,000 years ago and underwent positive selection, with all humans carrying multiple copies 3. Clinically, reduced BOLA2 copy number associates with iron-deficiency anemia, as demonstrated in chromosome 16.2 deletion carriers who show microcytosis, low serum iron, and decreased hemoglobin 4. In hepatocellular carcinoma, elevated BOLA2 expression predicts poor prognosis and associates with tumor hemorrhage through promoting iron overload and activating p62-Keap1 signaling 5. Thus, BOLA2 represents a dual-function gene critical for both normal iron homeostasis and potentially pathological iron metabolism in cancer.