TRIM28 repression of retrotransposon-based enhancers is necessary to preserve transcriptional dynamics in embryonic stem cells.

TRIM28 repression of retrotransposon-based enhancers is necessary to preserve transcriptional dynamics in embryonic stem cells.
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DOI:
10.1101/gr.147678.112
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发表时间:
2013-03
期刊:
影响因子:
7
通讯作者:
Trono D
Trono D
中科院分区:
生物学1区
文献类型:
--
作者:
Rowe HM;Kapopoulou A;Corsinotti A;Fasching L;Macfarlan TS;Tarabay Y;Viville S;Jakobsson J;Pfaff SL;Trono D

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TRIM28对胚胎干细胞内源性逆转录病毒(ERV)的沉默至关重要。在这里,我们揭示了这一过程的一个重要影响是保护早期胚胎中的细胞基因表达不受这些逆转录元件中包含的顺式作用激活剂的干扰。在TRIM28缺失的ES细胞中,ERV上的抑制性染色质标记被活性增强子典型的组蛋白修饰所取代,刺激附近细胞基因的转录,特别是那些含有二价启动子的基因。相应地,ERV衍生的序列可以抑制或增强邻近启动子在转基因胚胎中的表达,这取决于它们在ES细胞中对TRIM28的敏感性。因此,TRIM28介导的ERV控制不仅对防止逆转录转座至关重要,更广泛地说,对保护早期胚胎的转录动力学至关重要。
TRIM28 is critical for the silencing of endogenous retroviruses (ERVs) in embryonic stem (ES) cells. Here, we reveal that an essential impact of this process is the protection of cellular gene expression in early embryos from perturbation by cis-acting activators contained within these retroelements. In TRIM28-depleted ES cells, repressive chromatin marks at ERVs are replaced by histone modifications typical of active enhancers, stimulating transcription of nearby cellular genes, notably those harboring bivalent promoters. Correspondingly, ERV-derived sequences can repress or enhance expression from an adjacent promoter in transgenic embryos depending on their TRIM28 sensitivity in ES cells. TRIM28-mediated control of ERVs is therefore crucial not just to prevent retrotransposition, but more broadly to safeguard the transcriptional dynamics of early embryos.
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