BMP2K (bone morphogenetic protein 2-inducible kinase) is a serine/threonine kinase localized to the nucleus and cytoplasm with emerging roles in cell differentiation and intracellular transport. Primary functions include regulation of erythroid differentiation through alternative splicing variants that differentially control COPII assembly distribution and autophagy 1. BMP2K negatively regulates megakaryocyte polyploidization and differentiation by interacting with CDK2 and promoting mitosis 2, suggesting roles in cell cycle control. The protein associates with endocytic machinery including AP-2 adaptor complexes and Numb, regulating receptor trafficking and endocytosis 3. At the molecular level, BMP2K participates in regulatory networks controlling fibrosis: circular RNA derived from BMP2K (circ_BMP2K) inhibits cardiac fibroblast activation by enhancing miR-455-3p-mediated suppression of SUMO1 4. Disease relevance includes associations with acute megakaryoblastic leukemia, where BMP2K dysregulation promotes abnormal megakaryopoiesis and chemotherapy resistance 2, and acute lymphoblastic leukemia through ZNF384 fusion events 5. Genetic variants correlate with high myopia susceptibility 6, and BMP2K locus variants link to lupus nephritis through regulation of injury-responsive proximal tubule cells 7. Novel BMP2K::PDGFRA fusions in myeloid neoplasms indicate potential therapeutic targeting with tyrosine kinase inhibitors 8.