B-MYB Is Essential for Normal Cell Cycle Progression and Chromosomal Stability of Embryonic Stem Cells

被引:84
作者
Tarasov, Kirill V. [1 ]
Tarasova, Yelena S. [1 ]
Tam, Wai Leong [2 ]
Riordon, Daniel R. [1 ]
Elliott, Steven T. [3 ]
Kania, Gabriela [4 ]
Li, Jinliang [1 ]
Yamanaka, Satoshi [1 ]
Crider, David G. [1 ]
Testa, Gianluca [1 ]
Li, Ronald A. [5 ]
Lim, Bing [2 ,6 ]
Stewart, Colin L. [7 ]
Liu, Yie [8 ]
Van Eyk, Jennifer E. [3 ]
Wersto, Robert P. [9 ]
Wobus, Anna M. [4 ]
Boheler, Kenneth R. [1 ]
机构
[1] NIA, Cardiovasc Sci Lab, NIH, Baltimore, MD 21224 USA
[2] Genome Inst Singapore, Singapore, Singapore
[3] Johns Hopkins Univ, Dept Med, Baltimore, MD USA
[4] Leibniz Inst Plant Genet & Crop Plant Res, In vitro Differentiat Grp, Gatersleben, Germany
[5] Univ Calif Davis, Stem Cell Inst, Lab Stem Cell Engn & Bioelectricity, Davis, CA USA
[6] Harvard Med Sch, Harvard Inst Med, Boston, MA USA
[7] NCI, Canc & Dev Biol Lab, Frederick, MD USA
[8] NIH, NIA, Lab Mol Genet, Baltimore, MD USA
[9] NIH, NIA, Flow Cytometry Grp, Baltimore, MD USA
来源
PLOS ONE | 2008年 / 3卷 / 06期
关键词
D O I
10.1371/journal.pone.0002478
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
Background: The transcription factor B-Myb is present in all proliferating cells, and in mice engineered to remove this gene, embryos die in utero just after implantation due to inner cell mass defects. This lethal phenotype has generally been attributed to a proliferation defect in the cell cycle phase of G1. Methodology/Principal Findings: In the present study, we show that the major cell cycle defect in murine embryonic stem (mES) cells occurs in G2/M. Specifically, knockdown of B-Myb by short-hairpin RNAs results in delayed transit through G2/M, severe mitotic spindle and centrosome defects, and in polyploidy. Moreover, many euploid mES cells that are transiently deficient in B-Myb become aneuploid and can no longer be considered viable. Knockdown of B-Myb in mES cells also decreases Oct4 RNA and protein abundance, while over-expression of B-MYB modestly up-regulates pou5f1 gene expression. The coordinated changes in B-Myb and Oct4 expression are due, at least partly, to the ability of B-Myb to directly modulate pou5f1 gene promoter activity in vitro. Ultimately, the loss of B-Myb and associated loss of Oct4 lead to an increase in early markers of differentiation prior to the activation of caspase-mediated programmed cell death. Conclusions/Significance: Appropriate B-Myb expression is critical to the maintenance of chromosomally stable and pluripotent ES cells, but its absence promotes chromosomal instability that results in either aneuploidy or differentiation-associated cell death.
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页数:16
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