Computational construction of 3D chromatin ensembles and prediction of functional interactions of alpha-globin locus from 5C data.

Computational construction of 3D chromatin ensembles and prediction of functional interactions of alpha-globin locus from 5C data.
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DOI:
10.1093/nar/gkx784
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发表时间:
2017-11-16
影响因子:
14.9
通讯作者:
Liang J
Liang J
中科院分区:
生物学2区
文献类型:
--
作者:
Gürsoy G;Xu Y;Kenter AL;Liang J

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Conformation capture technologies measure frequencies of interactions between chromatin regions. However, understanding gene-regulation require knowledge of detailed spatial structures of heterogeneous chromatin in cells. Here we describe the nC-SAC (n-Constrained-Self Avoiding Chromatin) method that transforms experimental interaction frequencies into 3D ensembles of chromatin chains. nC-SAC first distinguishes specific from non-specific interaction frequencies, then generates 3D chromatin ensembles using identified specific interactions as spatial constraints. Application to α-globin locus shows that these constraints (∼20%) drive the formation of ∼99% all experimentally captured interactions, in which ∼30% additional to the imposed constraints is found to be specific. Many novel specific spatial contacts not captured by experiments are also predicted. A subset, of which independent ChIA-PET data are available, is validated to be RNAPII-, CTCF-, and RAD21-mediated. Their positioning in the architectural context of imposed specific interactions from nC-SAC is highly important. Our results also suggest the presence of a many-body structural unit involving α-globin gene, its enhancers, and POL3RK gene for regulating the expression of α-globin in silent cells.
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