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  4. Influence of Rotational Nucleosome Positioning on Transcription Start Site Selection in Animal Promoters
 
research article

Influence of Rotational Nucleosome Positioning on Transcription Start Site Selection in Animal Promoters

Dreos, René  
•
Ambrosini, Giovanna  
•
Bucher, Philipp  
2016
PLoS Comput Biol

The recruitment of RNA-Pol-II to the transcription start site (TSS) is an important step in gene regulation in all organisms. Core promoter elements (CPE) are conserved sequence motifs that guide Pol-II to the TSS by interacting with specific transcription factors (TFs). However, only a minority of animal promoters contains CPEs. It is still unknown how Pol-II selects the TSS in their absence. Here we present a comparative analysis of promoters’ sequence composition and chromatin architecture in five eukaryotic model organisms, which shows the presence of common and unique DNA-encoded features used to organize chromatin. Analysis of Pol-II initiation patterns uncovers that, in the absence of certain CPEs, there is a strong correlation between the spread of initiation and the intensity of the 10 bp periodic signal in the nearest downstream nucleosome. Moreover, promoters’ primary and secondary initiation sites show a characteristic 10 bp periodicity in the absence of CPEs. We also show that DNA natural variants in the region immediately downstream the TSS are able to affect both the nucleosome-DNA affinity and Pol-II initiation pattern. These findings support the notion that, in addition to CPEs mediated selection, sequence–induced nucleosome positioning could be a common and conserved mechanism of TSS selection in animals

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Type
research article
DOI
10.1371/journal.pcbi.1005144
Web of Science ID

WOS:000387660200026

Author(s)
Dreos, René  
Ambrosini, Giovanna  
Bucher, Philipp  
Date Issued

2016

Publisher

Public Library Science

Published in
PLoS Comput Biol
Volume

112

Issue

10

Article Number

e1005144

Subjects

transcription

•

promoters

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
GR-BUCHER  
Available on Infoscience
January 22, 2017
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/133105
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