Abstract
Polycomb group (Pc-G) proteins associate to form large complexes that repress Hox genes, thereby imposing Hox gene expression pattern required for development. However, Pc-G proteins have a Hox-independent function in controlling cell proliferation. Here we show that embryonic fibroblasts derived from M33-deficient mice are impaired in the progression into the S phase of the cell cycle, as shown by a reduced rate of incorporation of bromodeoxyuridine. These cells have a senescent phenotype, associated to an abnormal accumulation of the cyclin-dependent kinase inhibitor p16INK4a protein. We demonstrate that this defect is bypassed in mutant embryonic fibroblasts expressing a transdominant negative form of the cell cycle controlling transcription factor E2F (E2F-DB). In addition, we show that the polycomb protein M33 controls critical expansion of B- and T-lymphocyte precursors. Together, our results emphasize M33-Polycomb protein function in cell cycle control.
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Acknowledgements
We are grateful to D Dean for providing the pCMVE2F1(1–374) plasmid, to M Malissen for the EμSV-Bcl-2-25 mouse strain, to R Schotte and M Naspetti for the LZRS-ires-GFP retroviral vector. We thank M Barad and N Brun for their technical help with FACS and cell sorting. This work was supported by grants from CNRS, ARC, LNCC and Fondation de France.
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Coré, N., Joly, F., Boned, A. et al. Disruption of E2F signaling suppresses the INK4a-induced proliferative defect in M33-deficient mice. Oncogene 23, 7660–7668 (2004). https://doi.org/10.1038/sj.onc.1207998
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DOI: https://doi.org/10.1038/sj.onc.1207998
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