KSHV episomes reveal dynamic chromatin loop formation with domain-specific gene regulation.

KSHV episomes reveal dynamic chromatin loop formation with domain-specific gene regulation.
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DOI:
10.1038/s41467-017-02089-9
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发表时间:
2018-01-04
影响因子:
16.6
通讯作者:
Izumiya Y
Izumiya Y
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Campbell M;Watanabe T;Nakano K;Davis RR;Lyu Y;Tepper CG;Durbin-Johnson B;Fujimuro M;Izumiya Y

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The three-dimensional structure of chromatin organized by genomic loops facilitates RNA polymerase II access to distal promoters. The Kaposi’s sarcoma-associated herpesvirus (KSHV) lytic transcriptional program is initiated by a single viral transactivator, K-Rta. Here we report the KSHV genomic structure and its relationship with K-Rta recruitment sites using Capture Hi–C analyses. High-resolution 3D viral genomic maps identify a number of direct physical, long-range, and dynamic genomic interactions. Mutant KSHV chromosomes harboring point mutations in the K-Rta responsive elements (RE) significantly attenuate not only the directly proximate downstream gene, but also distal gene expression in a domain-specific manner. Genomic loops increase in the presence of K-Rta, while abrogation of K-Rta binding impairs the formation of inducible genomic loops, decreases the expression of genes networked through the looping, and diminishes KSHV replication. Our study demonstrates that genomic architectural dynamics plays an essential role in herpesvirus gene expression. Genomic loops and their temporal dynamics play an important role in gene expression of DNA viruses, but are incompletely understood. Here, the authors use capture Hi-C analyses and identify genomic architectural dynamics of KSHV that are regulated by the viral transactivator K-Rta.
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