Gene body methylation can alter gene expression and is a therapeutic target in cancer.

Gene body methylation can alter gene expression and is a therapeutic target in cancer.
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DOI:
10.1016/j.ccr.2014.07.028
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发表时间:
2014-10-13
期刊:
影响因子:
50.3
通讯作者:
Liang G
Liang G
中科院分区:
医学1区
文献类型:
--
作者:
Yang X;Han H;De Carvalho DD;Lay FD;Jones PA;Liang G

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众所周知,启动子中的DNA甲基化可以沉默基因,并且是甲基化抑制剂的假定治疗靶点。基因体甲基化与表达正相关,但其功能尚不清楚。我们发现,5-氮杂-2 '-脱氧胞苷处理不仅重新激活基因,但减少了基因的过度表达,其中许多基因参与c-MYC调控的代谢过程。下调是由基因体的DNA去甲基化引起的,高水平表达的恢复需要DNMT 3B的再甲基化。因此,基因体甲基化可能是DNA甲基化抑制剂的一个意想不到的治疗靶点,导致癌发生过程中诱导的基因过表达正常化。我们的研究结果为基因体甲基化和转录之间的因果关系提供了直接证据。
DNA methylation in promoters is well known to silence genes and is the presumed therapeutic target of methylation inhibitors. Gene body methylation is positively correlated with expression yet its function is unknown. We show that 5-aza-2'-deoxycytidine treatment not only reactivates genes but decreases the over-expression of genes, many of which are involved in metabolic processes regulated by c-MYC. Down-regulation is caused by DNA demethylation of the gene bodies and restoration of high levels of expression requires remethylation by DNMT3B. Gene body methylation may therefore be an unexpected therapeutic target for DNA methylation inhibitors, resulting in the normalization of gene over-expression induced during carcinogenesis. Our results provide direct evidence for a causal relationship between gene body methylation and transcription.
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