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arXiv 0910.2678q-bio.GNq-bio.SC
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细胞核中基因组空间组织的热力学途径

Thermodynamic pathways to genome spatial organization in the cell nucleus

Mario Nicodemi, Antonella Prisco

摘要:

真核生物基因组的结构以高度的空间组织为特征。染色体占据与它们的活动状态相关的优选区域,然而,取代它们的基因以复杂的模式与远程位点相互作用,需要大量的DNA基因座和分子调节剂的协调。这一组织绝非随意成立,它发挥着至关重要的职能作用,但其管理原则仍然难以捉摸。通过计算机模拟的统计力学模型,我们展示了如何建筑图案自发产生的可溶性结合分子和染色体之间的物理相互作用,通过集体热力学机制。染色体共定位,环和领土的形式,并找到它们的相对位置作为稳定的热力学状态。这些通过“热力学开关”来选择,所述热力学开关由可溶性介质的浓度/亲和力以及它们沿染色体的附着位点的数量/位置来调节。因此,我们的“热力学开关模型”的核结构,解释了如何众所周知的细胞策略的DNA结合蛋白的上调或染色质结构的修改可以动态地塑造组织的细胞核的定量基础上。

英文摘要:

The architecture of the eukaryotic genome is characterized by a high degree of spatial organization. Chromosomes occupy preferred territories correlated to their state of activity and, yet, displace their genes to interact with remote sites in complex patterns requiring the orchestration of a huge number of DNA loci and molecular regulators. Far from random, this organization serves crucial functional purposes, but its governing principles remain elusive. By computer simulations of a Statistical Mechanics model, we show how architectural patterns spontaneously arise from the physical interaction between soluble binding molecules and chromosomes via collective thermodynamics mechanisms. Chromosomes colocalize, loops and territories form and find their relative positions as stable thermodynamic states. These are selected by "thermodynamic switches" which are regulated by concentrations/affinity of soluble mediators and by number/location of their attachment sites along chromosomes. Our "thermodynamic switch model" of nuclear architecture, thus, explains on quantitative grounds how well known cell strategies of upregulation of DNA binding proteins or modification of chromatin structure can dynamically shape the organization of the nucleus.

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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