title: Regulation of hematopoiesis by the K63-specific ubiquitin-conjugating enzyme Ubc13.
abstract: The ubiquitin-conjugating enzyme Ubc13 mediates lysine-63-specific protein ubiquitination involved in signal transduction by immune receptors; however, the in vivo physiological functions of Ubc13 remain incompletely understood. Using Ubc13 conditional knockout mice, we show that somatic deletion of the Ubc13 gene causes severe loss of multi lineages of immune cells, which is associated with profound atrophy of the thymus and bone marrow, as well as lethality of the mice. Ubc13 has a cell-intrinsic function in mediating hematopoiesis and is essential for the survival and accumulation of hematopoietic stem cells in the bone marrow. Interestingly, loss of Ubc13 results in accumulation of beta-catenin and hyperexpression of Wnt target genes, a condition known to cause impaired hematopoiesis. These results establish Ubc13 as a crucial regulator of hematopoiesis and suggest a role for Ubc13 in the control of Wnt signaling in hematopoietic stem cells.
authors.affiliation: Department of Immunology, University of Texas MD Anderson Cancer Center, 7455 Fannin Street, Box 902, Houston, TX 77030, USA.
authors.forename: Xuefeng
authors.initials: X
authors.lastname: Wu
authors.forename: Masahiro
authors.initials: M
authors.lastname: Yamamoto
authors.forename: Shizuo
authors.initials: S
authors.lastname: Akira
authors.forename: Shao-Cong
authors.initials: SC
authors.lastname: Sun
mesh_terms: D000818:Animals; D001284:Atrophy; D001773:Blood Cells / Q000201:enzymology / Q000473:pathology; D001854:Bone Marrow Cells / Q000473:pathology; D002454:Cell Differentiation; D020964:Embryo Loss / Q000201:enzymology / Q000473:pathology; D018507:Gene Expression Regulation, Developmental; D006410:Hematopoiesis; D019426:Integrases / Q000378:metabolism; D008239:Lysine / Q000378:metabolism*; D051379:Mice; D018345:Mice, Knockout; D015398:Signal Transduction; D013234:Stem Cells / Q000473:pathology; D013379:Substrate Specificity; D013950:Thymus Gland / Q000201:enzymology / Q000473:pathology; D044763:Ubiquitin-Conjugating Enzymes / Q000172:deficiency / Q000378:metabolism*; D051153:Wnt Proteins / Q000378:metabolism; D051176:beta Catenin / Q000235:genetics / Q000378:metabolism
chemical_list: D051153:Wnt Proteins; D051176:beta Catenin; C514982:Ube2n protein, mouse; D044763:Ubiquitin-Conjugating Enzymes; C045073:Cre recombinase; D019426:Integrases; D008239:Lysine