TSPO2 (translocator protein 2) is a cholesterol-binding transmembrane protein specifically expressed in erythroid cells that plays essential roles in erythropoiesis and red blood cell function 1. The protein primarily functions by redistributing intracellular cholesterol from lipid droplets to the endoplasmic reticulum, which is critical for meeting cholesterol demands during erythropoietic differentiation 1. TSPO2 coordinates both maturation and proliferation of terminally differentiating erythroblasts, with deficiency leading to impaired cytokinesis, increased binucleated cells, and compensated anemia 2. Beyond cholesterol metabolism, TSPO2 participates in a supramolecular membrane transport complex with VDAC and ANT that mediates ATP release from red blood cells through VDAC oligomerization 3. The protein also functions as a selective transporter for heme biosynthesis precursors, specifically facilitating 5-aminolevulinic acid import across the plasma membrane, which is essential for protoporphyrin IX accumulation in erythroid cells 4. Unlike its paralog TSPO1, TSPO2 has lost drug ligand-binding properties but retained cholesterol-binding capabilities and shows tissue-specific distribution in hematopoietic cells 1. These diverse functions make TSPO2 crucial for normal erythropoiesis and red blood cell physiology.