期刊
CELL CYCLE
卷 9, 期 19, 页码 3984-3990出版社
LANDES BIOSCIENCE
DOI: 10.4161/cc.9.19.13208
关键词
ING2; cell cycle; G(1)/S checkpoint; p21; ING1; p53; sumoylation; H3K4Me3
类别
资金
- ARC
- IASLC
- 'Agir a dom' grant
- Marie Curie International Reintegration Grant [MIRG-CT-2006-042148]
- French Ministry of Education and Research
- INCa
ING2 (Inhibitor of Growth 2) is a candidate tumor suppressive protein frequently lost in human tumors. Recently, we have reported that ING2 downregulation impairs DNA replication forks progression and leads to genome instability. To better understand the tumor suppressive functions of ING2 and its role in the cell cycle, we downregulated its expression in cells and studied the consequences of this downregulation on the G(1)/S transition. We observed that the inhibition of ING2 expression accelerated the progression of cells from G(1) to S-phase, and was accompanied by a decrease of p21 expression. Moreover, we show that the regulation of p21 by ING2 is independent of the tumor suppressive protein p53. Interestingly, this function seems to be unique for ING2 since its closest homolog ING1 does not regulate the G(1)/S transition. It has been suggested previously that ING2 may modulate the trimethylation of H3K4 at the promoter of p21. Accordingly, our results suggest that there may be a link between the regulation of the G(1)/S transition by ING2 and the level of H3K4Me3. All together, these results bring new information concerning the role of ING2 in the regulation of the cell cycle and suggest that it may play important roles in controlling several S-phase checkpoints.
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