URB2 is a ribosome biogenesis protein essential for hematopoietic stem cell (HSC) development. Functionally, URB2 localizes to the nucleolus and midbody, where it regulates ribosome biogenesis 1. The primary mechanism involves regulation of the p53/TP53 pathway; URB2 deficiency leads to p53 pathway upregulation, causing compromised cell proliferation and excessive apoptosis in hematopoietic tissues 1. Loss of p53 function fully rescues hematopoietic defects in URB2-deficient models, establishing p53 as a critical downstream effector 1. Disease relevance: URB2 mutations associate with ribosomopathies, a class of diseases characterized by defective ribosome biogenesis. Specifically, URB2 dysfunction impairs HSC expansion and early T cell development in the thymus 1. Additionally, URB2 variants (p.Glu594Val) influence fasting insulin levels 2 and have been identified in association studies of metabolic traits and meat quality composition 3. Clinical significance: Given URB2's role in hematopoiesis regulation through p53 control, understanding URB2 dysfunction could inform therapeutic strategies for hematopoietic disorders and ribosomopathies. The gene's involvement in metabolic regulation suggests broader clinical implications beyond hematopoiesis.