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2016 ; 7
(6
): 6460-75
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Hierarchical regulation of the genome: global changes in nucleosome organization
potentiate genome response
#MMPMID26771136
Sexton BS
; Druliner BR
; Vera DL
; Avey D
; Zhu F
; Dennis JH
Oncotarget
2016[Feb]; 7
(6
): 6460-75
PMID26771136
show ga
Nucleosome occupancy is critically important in regulating access to the
eukaryotic genome. Few studies in human cells have measured genome-wide
nucleosome distributions at high temporal resolution during a response to a
common stimulus. We measured nucleosome distributions at high temporal resolution
following Kaposi's-sarcoma-associated herpesvirus (KSHV) reactivation using our
newly developed mTSS-seq technology, which maps nucleosome distribution at the
transcription start sites (TSS) of all human genes. Nucleosomes underwent
widespread changes in organization 24 hours after KSHV reactivation and returned
to their basal nucleosomal architecture 48 hours after KSHV reactivation. The
widespread changes consisted of an indiscriminate remodeling event resulting in
the loss of nucleosome rotational phasing signals. Additionally, one in six TSSs
in the human genome possessed nucleosomes that are translationally remodeled. 72%
of the loci with translationally remodeled nucleosomes have nucleosomes that
moved to positions encoded by the underlying DNA sequence. Finally we
demonstrated that these widespread alterations in nucleosomal architecture
potentiated regulatory factor binding. These descriptions of nucleosomal
architecture changes provide a new framework for understanding the role of
chromatin in the genomic response, and have allowed us to propose a hierarchical
model for chromatin-based regulation of genome response.