arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1908.05851cond-mat.softcond-mat.dis-nnphysics.bio-phq-bio.SC
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单核小体动力学揭示的快染色质和慢染色质的组织

Organization of fast and slow chromatin revealed by single-nucleosome dynamics

S. S. Ashwin, Tadasu Nozaki, Kazuhiro Maeshima, Masaki Sasai

摘要:

了解染色质的组织和动力学是很重要的,因为它们对DNA功能有着至关重要的影响。在这项研究中,我们调查染色质动态统计分析单个核小体运动在活的人类细胞。核小体的均方位移分布的双峰性质允许将核小体自然分类为快和慢。对这些类别中核小体-核小体关联函数以及振动模式密度的分析表明,核小体形成动态关联的流体区域,即,快核小体和慢核小体的动态域。由全局组蛋白乙酰化或粘着蛋白失活引起的核小体动力学扰动表明核小体-核小体相互作用以及染色质链的束缚将核小体组织成快速和慢速动力学结构域。介绍了一个简单的聚合物模型,它显示了这种动态域图片的一致性。单核小体运动的统计分析提供了丰富的信息,染色质是如何在活细胞中以流体的方式动态组织。

英文摘要:

Understanding chromatin organization and dynamics is important since they crucially affect DNA functions. In this study, we investigate chromatin dynamics by statistically analyzing single-nucleosome movement in living human cells. Bi-modal nature of the mean squared displacement distribution of nucleosomes allows for a natural categorization of the nucleosomes as fast and slow. Analyses of the nucleosome-nucleosome correlation functions within these categories along with the density of vibrational modes show that the nucleosomes form dynamically correlated fluid regions, i.e., dynamic domains of fast and slow nucleosomes. Perturbed nucleosome dynamics by global histone acetylation or cohesin inactivation indicate that nucleosome-nucleosome interactions along with tethering of chromatin chains organize nucleosomes into fast and slow dynamic domains. A simple polymer model is introduced, which shows the consistency of this dynamic domain picture. Statistical analyses of single-nucleosome movement provide rich information on how chromatin is dynamically organized in a fluid manner in living cells.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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