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
中科院分区:
文献类型:
--
作者:
Dorier J;Stasiak A
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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