Principles of Chromosome Architecture Revealed by Hi-C.

Principles of Chromosome Architecture Revealed by Hi-C.
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DOI:
10.1016/j.tibs.2018.03.006
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发表时间:
2018-06
影响因子:
13.8
通讯作者:
Eagen KP
Eagen KP
中科院分区:
生物学1区
文献类型:
--
作者:
Eagen KP

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染色体在间期细胞核内折叠和紧致,但这种折叠的分子基础尚不清楚。染色体构象捕获方法,如Hi-C,结合了染色质的化学交联,然后是片段化,DNA连接和高通量DNA测序,以检测邻近的全基因组位点。Hi-C揭示了染色质分为活性区室和非活性区室的分离,以及DNA折叠成自相关结构域和环。最近的研究表明,耗尽CTCF、内聚蛋白或内聚蛋白相关蛋白会影响大多数结构域和环,其方式与通过挤压染色质环进行DNA折叠的模型一致。区隔不依赖于CTCF或黏结蛋白。Hi-C接触图代表CTCF/黏结依赖和不依赖折叠态的叠加。
Chromosomes are folded and compacted within interphase nuclei, but the molecular basis of this folding is poorly understood. Chromosome conformation capture methods, such as Hi-C, combine chemical cross-linking of chromatin followed by fragmentation, DNA ligation, and high-throughput DNA sequencing to detect neighboring loci genome-wide. Hi-C has revealed the segregation of chromatin into active and inactive compartments, and the folding of DNA into self-associating domains and loops. Depleting CTCF, cohesin, or cohesin-associated proteins was recently shown to affect the majority of domains and loops in a manner that is consistent with a model of DNA folding through extrusion of chromatin loops. Compartmentation was not dependent on CTCF or cohesin. Hi-C contact maps represent the superimposition of CTCF/cohesin-dependent and -independent folding states.
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