A simulation model of heterochromatin formation at submolecular detail.

A simulation model of heterochromatin formation at submolecular detail.
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DOI:
10.1016/j.isci.2022.104590
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发表时间:
2022-07-15
期刊:
影响因子:
5.8
通讯作者:
Kireev, Dmitri
Kireev, Dmitri
中科院分区:
综合性期刊2区
文献类型:
--
作者:
Williams, Michael R.;Xiaokang, Yan;Hathaway, Nathaniel A.;Kireev, Dmitri

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Heterochromatin is a physical state of the chromatin fiber that maintains gene repression during cell development. Although evidence exists on molecular mechanisms involved in heterochromatin formation, a detailed structural mechanism of heterochromatin formation needs a better understanding. We made use of a simple Monte Carlo simulation model with explicit representation of key molecular events to observe molecular self-organization leading to heterochromatin formation. Our simulations provide a structural interpretation of several important traits of the heterochromatinization process. In particular, this study provides a depiction of how small amounts of HP1 are able to induce a highly condensed chromatin state through HP1 dimerization and bridging of sequence-remote nucleosomes. It also elucidates structural roots of a yet poorly understood phenomenon of a nondeterministic nature of heterochromatin formation and subsequent gene repression. Experimental chromatin in vivo assay provides an unbiased estimate of time scale of repressive response to a heterochromatin-triggering event. Proposed model accurately accounts for the entropic cost of chromatin condensation Simulations rationalize the bridging hypothesis of chromatin compaction The model explains observed non-determinism of heterochromatin formation Computational molecular modeling; Cell biology
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