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Chromatin remodelling at promoters suppresses antisense transcription

机译:启动子上的染色质重塑抑制反义转录

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Chromatin allows the eukaryotic cell to package its DNA efficiently. To understand how chromatin structure is controlled across the Saccharomyces cerevisiae genome, we have investigated the role of the ATP-dependent chromatin remodelling complex Isw2 in positioning nucleosomes. We find that Isw2 functions adjacent to promoter regions where it repositions nucleosomes at the interface between genie and intergenic sequences. Nucleosome repositioning by Isw2 is directional and results in increased nucleosome occupancy of the intergenic region. Loss of Isw2 activity leads to inappropriate transcription, resulting in the generation of both coding and noncoding transcripts. Here we show that Isw2 repositions nucleosomes to enforce directionality on transcription by preventing transcription initiation from cryptic sites. Our analyses reveal how chromatin is organized on a global scale and advance our understanding of how transcription is regulated.
机译:染色质可以使真核细胞有效地包装其DNA。为了了解如何在整个酿酒酵母基因组中控制染色质结构,我们研究了ATP依赖的染色质重塑复合物Isw2在定位核小体中的作用。我们发现Isw2的功能与启动子区域相邻,在Isw2中它在基因组和基因间序列之间的界面处重新定位核小体。 Isw2对核小体的重新定位是有方向性的,并导致基因间区域的核小体占据增加。 Isw2活性的丧失会导致不适当的转录,从而导致编码和非编码转录本的产生。在这里,我们显示Isw2重新定位核小体,以通过阻止来自隐性位点的转录起始来强制转录的方向性。我们的分析揭示了染色质如何在全球范围内组织,并加深了我们对转录调控方式的理解。

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