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Synergism between DNA methylation and macroH2A1 occupancy in epigenetic silencing of the tumor suppressor gene p16(CDKN2A)

tlexander 添加于 2010-11-15 00:03 | 1354 次阅读 | 0 个评论

作者
Barzily-Rokni M, Friedman N, Ron-Bigger S, Isaac S, Michlin D, Eden A
摘要
Promoter hypermethylation and heterochromatinization is a frequent event leading to gene inactivation and tumorigenesis. At the molecular level, inactivation of tumor suppressor genes in cancer has many similarities to the inactive X chromosome in female cells and is defined and maintained by DNA methylation and characteristic histone modifications. In addition, the inactive-X is marked by the histone macroH2A, a variant of H2A with a large non-histone region of unknown function. Studying tumor suppressor genes (TSGs) silenced in cancer cell lines, we find that when active, these promoters are associated with H2A.Z but become enriched for macroH2A1 once silenced. Knockdown of macroH2A1 was not sufficient for reactivation of silenced genes. However, when combined with DNA demethylation, macroH2A1 deficiency significantly enhanced reactivation of the tumor suppressor genes p16, MLH1 and Timp3 and inhibited cell proliferation. Our findings link macroH2A1 to heterochromatin of epigenetically silenced cancer genes and indicate synergism between macroH2A1 and DNA methylation in maintenance of the silenced state.
详细资料
- 文献种类: Journal Article
- 期刊名称: Nucleic Acids Research
- 期刊缩写: Nucleic Acids Res
- 期卷页: 2010年
- 地址: Department of Cell & Developmental Biology, Institute of Life Sciences, The Hebrew University of Jerusalem, Jerusalem, Israel
- ISBN: 0305-1048
- 备注:PMID:21030442
学科领域生物医药 » 基础医学
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