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Mechanism of Long-Range Chromosome Motion Triggered by Gene Activation.
Developmental Cell ( IF 10.7 ) Pub Date : 2019-12-31 , DOI: 10.1016/j.devcel.2019.12.007
Anqi Wang 1 , Janhavi A Kolhe 1 , Nate Gioacchini 2 , Imke Baade 1 , William M Brieher 1 , Craig L Peterson 2 , Brian C Freeman 1
Affiliation  

Movement of chromosome sites within interphase cells is critical for numerous pathways including RNA transcription and genome organization. Yet, a mechanism for reorganizing chromatin in response to these events had not been reported. Here, we delineate a molecular chaperone-dependent pathway for relocating activated gene loci in yeast. Our presented data support a model in which a two-authentication system mobilizes a gene promoter through a dynamic network of polymeric nuclear actin. Transcription factor-dependent nucleation of a myosin motor propels the gene locus through the actin matrix, and fidelity of the actin association was ensured by ARP-containing chromatin remodelers. Motor activity of nuclear myosin was dependent on the Hsp90 chaperone. Hsp90 further contributed by biasing the remodeler-actin interaction toward nucleosomes with the non-canonical histone H2A.Z, thereby focusing the pathway on select sites such as transcriptionally active genes. Together, the system provides a rapid and effective means to broadly yet selectively mobilize chromatin sites.

中文翻译:


基因激活触发的长程染色体运动机制。



间期细胞内染色体位点的移动对于包括 RNA 转录和基因组组织在内的许多途径至关重要。然而,尚未报道重组染色质以响应这些事件的机制。在这里,我们描绘了一种分子伴侣依赖性途径,用于重新定位酵母中激活的基因位点。我们提供的数据支持一个模型,其中双重验证系统通过聚合核肌动蛋白的动态网络动员基因启动子。肌球蛋白运动的转录因子依赖性成核推动基因座通过肌动蛋白基质,并且含有 ARP 的染色质重塑剂确保了肌动蛋白关联的保真度。核肌球蛋白的运动活性依赖于 Hsp90 伴侣。 Hsp90 进一步通过非典型组蛋白 H2A.Z 将重塑因子-肌动蛋白相互作用偏向于核小体,从而将通路集中在转录活性基因等选定位点上。总之,该系统提供了一种快速有效的方法来广泛而选择性地动员染色质位点。
更新日期:2020-01-02
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