Oxidative damage targets complexes containing DNA methyltransferases, SIRT1, and polycomb members to promoter CpG Islands.
Oxidative damage targets complexes containing DNA methyltransferases, SIRT1, and polycomb members to promoter CpG Islands.
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DOI:
10.1016/j.ccr.2011.09.012
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发表时间:
2011-11-15
期刊:
影响因子:
50.3
通讯作者:
Baylin SB
中科院分区:
文献类型:
--
作者:
O'Hagan HM;Wang W;Sen S;Destefano Shields C;Lee SS;Zhang YW;Clements EG;Cai Y;Van Neste L;Easwaran H;Casero RA;Sears CL;Baylin SB
Cancer cells simultaneously harbor global losses and gains in DNA methylation. We demonstrate that inducing cellular oxidative stress by treatment with hydrogen peroxide, recruits DNA methyltransferase 1 (DNMT1) to damaged chromatin. DNMT1 becomes part of a complex(es) containing DNMT3B and members of Polycomb Repressive Complex 4. Hydrogen peroxide treatment causes translocalization of these proteins from non-GC-rich to GC-rich areas. Key components are similarly enriched at gene promoters in an in vivo colitis model. While high expression genes enriched for members of the complex have histone mark and nascent transcription changes, CpG island-containing low expression genes gain promoter DNA methylation. Thus, oxidative damage induces formation and localization of a silencing complex that may explain cancer-specific aberrant DNA methylation and transcriptional silencing.
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