Mar 31, 2017

Widespread changes in nucleosome accessibility without changes in nucleosome occupancy during a rapid transcriptional induction

Genes & Development
Britta MuellerRobert E Kingston

Abstract

Activation of transcription requires alteration of chromatin by complexes that increase the accessibility of nucleosomal DNA. Removing nucleosomes from regulatory sequences has been proposed to play a significant role in activation. We tested whether changes in nucleosome occupancy occurred on the set of genes that is activated by the unfolded protein response (UPR). We observed no decrease in occupancy on most promoters, gene bodies, and enhancers. Instead, there was an increase in the accessibility of nucleosomes, as measured by micrococcal nuclease (MNase) digestion and ATAC-seq (assay for transposase-accessible chromatin [ATAC] using sequencing), that did not result from removal of the nucleosome. Thus, changes in nucleosome accessibility predominate over changes in nucleosome occupancy during rapid transcriptional induction during the UPR.

Mentioned in this Paper

Nucleosomes
Transposase
Micrococcal Nuclease
Body Structure
Genes
Unfolded Protein Response
Complex (molecular entity)
Transcription, Genetic
Nucleic Acid Sequencing
Promoter

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