Topological origins of chromosomal territories.

Topological origins of chromosomal territories.
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DOI:
10.1093/nar/gkp702
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发表时间:
2009-10
影响因子:
14.9
通讯作者:
Stasiak A
Stasiak A
中科院分区:
生物学2区
文献类型:
--
作者:
Dorier J;Stasiak A

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利用自由连接的高分子模型,比较了拥挤高分子链的平衡性质,这些链段对于其他链段是可渗透的或不可渗透的。特别是,我们解决了这样一个问题:在不存在排除体积效应的情况下,长链分子的非渗透性是否足以分隔高度拥挤的聚合物链,类似于间期核中染色体区域形成期间发生的情况。我们的研究结果表明,即使没有排除体积的聚合物划分,并显示出强烈减少相互混合时,它们是不可渗透的。从已知的事实,即来自不同的染色体的染色质纤维显示非常有限的混杂在间期细胞核,我们建议,在染色体解凝聚过程中,规则的染色质纤维很难作为细胞II型DNA拓扑异构酶的底物。
Using freely jointed polymer model we compare equilibrium properties of crowded polymer chains whose segments are either permeable or not permeable for other segments to pass through. In particular, we addressed the question whether non-permeability of long chain molecules, in the absence of excluded volume effect, is sufficient to compartmentalize highly crowded polymer chains, similarly to what happens during formation of chromosomal territories in interphase nuclei. Our results indicate that even polymers without excluded volume compartmentalize and show strongly reduced intermingling when they are mutually non-permeable. Judging from the known fact that chromatin fibres originating from different chromosomes show very limited intermingling in interphase nuclei, we propose that regular chromatin fibres during chromosome decondensation can hardly serve as a substrate of cellular type II DNA topoisomerases.
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