Genome-scale epigenetic reprogramming during epithelial-to-mesenchymal transition.

Genome-scale epigenetic reprogramming during epithelial-to-mesenchymal transition.
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DOI:
10.1038/nsmb.2084
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发表时间:
2011-07-03
影响因子:
16.8
通讯作者:
Feinberg, Andrew P.
Feinberg, Andrew P.
中科院分区:
生物学1区
文献类型:
--
作者:
McDonald, Oliver G.;Wu, Hao;Timp, Winston;Doi, Akiko;Feinberg, Andrew P.

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上皮细胞向间充质细胞转化(EMT)是细胞可塑性的一个极端例子,对正常发育、损伤修复和恶性进展都很重要。广泛的表观遗传重编程发生在干细胞分化和恶性转化过程中,但emt相关的表观遗传重编程知之甚少。在这里,我们研究了TGF-β介导的EMT过程中的表观遗传修饰。虽然DNA甲基化在EMT期间没有变化,但我们发现异染色质标记H3-lys9二甲基化(H3K9Me2)整体减少,常染色质标记H3-lys4三甲基化(H3K4Me3)增加,转录标记H3-lys36三甲基化(H3K36Me3)增加。这些变化很大程度上依赖于赖氨酸特异性脱氨酶-1 (Lsd1), Lsd1功能丧失实验显示,emt驱动的细胞迁移和化学耐药有显著影响。基因组尺度的图谱显示,染色质变化在很大程度上是特异性的大组织异染色质k9修饰(LOCKs),这表明EMT的特征是基因组中特定染色质结构域的重编程。
Epithelial to mesenchymal transition (EMT) is an extreme example of cell plasticity, important for normal development, injury repair, and malignant progression. Widespread epigenetic reprogramming occurs during stem cell differentiation and malignant transformation, but EMT-related epigenetic reprogramming is poorly understood. Here we investigated epigenetic modifications during TGF-β-mediated EMT. While DNA methylation was unchanged during EMT, we found global reduction of the heterochromatin mark H3-lys9 dimethylation (H3K9Me2), increase of the euchromatin mark H3-lys4 trimethylation (H3K4Me3), and increase of the transcriptional mark H3-lys36 trimethylation (H3K36Me3). These changes were largely dependent on lysine-specific deaminase-1 (Lsd1), and Lsd1 loss-of-function experiments showed marked effects on EMT-driven cell migration and chemoresistance. Genome-scale mapping revealed that chromatin changes were largely specific to large organized heterochromatin K9-modifications (LOCKs), suggesting that EMT is characterized by reprogramming of specific chromatin domains across the genome.
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