Regulation of SNAIL1 and E-cadherin function by DNMT1 in a DNA methylation-independent context.

Regulation of SNAIL1 and E-cadherin function by DNMT1 in a DNA methylation-independent context.
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DOI:
10.1093/nar/gkr658
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发表时间:
2011-11
影响因子:
14.9
通讯作者:
Esteller M
Esteller M
中科院分区:
生物学2区
文献类型:
--
作者:
Espada J;Peinado H;Lopez-Serra L;Setién F;Lopez-Serra P;Portela A;Renart J;Carrasco E;Calvo M;Juarranz A;Cano A;Esteller M

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哺乳动物DNA甲基转移酶1(DNMT 1)是维持细胞分裂后DNA甲基化模式所必需的。DNMT 1催化活性的破坏导致CpG二核苷酸的全基因组胞嘧啶去甲基化,促进体细胞和胚胎发育期间的严重功能障碍。虽然这些观察结果表明,DNMT 1依赖的DNA甲基化是正常细胞功能所必需的,但DNMT 1具有独立于其催化活性的作用的可能性是一个有争议的问题。在这里,我们提供的证据表明,DNMT 1可以支持不需要C-末端催化结构域的细胞功能。我们报告说,PCNA和DMAP 1结构域的N-末端区域的DNMT 1是足够的调节E-钙粘蛋白的表达,在没有明显的变化,DNA甲基化模式的基因启动子。E-钙粘蛋白表达的变化与β-连环蛋白依赖性转录的调节直接相关。目前的证据表明,DNMT 1通过与E-钙粘蛋白转录抑制因子SNAIL 1的直接相互作用来作用于E-钙粘蛋白的表达。
Mammalian DNA methyltransferase 1 (DNMT1) is essential for maintaining DNA methylation patterns after cell division. Disruption of DNMT1 catalytic activity results in whole genome cytosine demethylation of CpG dinucleotides, promoting severe dysfunctions in somatic cells and during embryonic development. While these observations indicate that DNMT1-dependent DNA methylation is required for proper cell function, the possibility that DNMT1 has a role independent of its catalytic activity is a matter of controversy. Here, we provide evidence that DNMT1 can support cell functions that do not require the C-terminal catalytic domain. We report that PCNA and DMAP1 domains in the N-terminal region of DNMT1 are sufficient to modulate E-cadherin expression in the absence of noticeable changes in DNA methylation patterns in the gene promoters involved. Changes in E-cadherin expression are directly associated with regulation of β-catenin-dependent transcription. Present evidence suggests that the DNMT1 acts on E-cadherin expression through its direct interaction with the E-cadherin transcriptional repressor SNAIL1.
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