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  4. Individual transcription factors modulate both the micromovement of chromatin and its long-range structure
 
research article

Individual transcription factors modulate both the micromovement of chromatin and its long-range structure

Shaban, Haitham A.  
•
Friman, Elias T.
•
Deluz, Cedric
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April 30, 2024
Proceedings Of The National Academy Of Sciences Of The United States Of America (PNAS)

The control of eukaryotic gene expression is intimately connected to highly dynamic chromatin structures. Gene regulation relies on activator and repressor transcription factors (TFs) that induce local chromatin opening and closing. However, it is unclear how nucleuswide chromatin organization responds dynamically to the activity of specific TFs. Here, we examined how two TFs with opposite effects on local chromatin accessibility modulate chromatin dynamics nucleuswide. We combine high - resolution diffusion mapping and dense flow reconstruction and correlation in living cells to obtain an imaging - based, nanometer - scale analysis of local diffusion processes and long - range coordinated movements of both chromatin and TFs. We show that the expression of either an individual transcriptional activator (CDX2) or repressor (SIX6) with large numbers of binding sites increases chromatin mobility nucleuswide, yet they induce opposite coherent chromatin motions at the micron scale. Hi - C analysis of higher - order chromatin structures shows that induction of the pioneer factor CDX2 leads both to changes in local chromatin interactions and the distribution of A and B compartments, thus relating the micromovement of chromatin with changes in compartmental structures. Given that inhibition of transcription initiation and elongation by RNA Pol II has a partial impact on the global chromatin dynamics induced by CDX2, we suggest that CDX2 overexpression alters chromatin structure dynamics both dependently and independently of transcription. Our biophysical analysis shows that sequence - specific TFs can influence chromatin structure on multiple architectural levels, arguing that local chromatin changes brought by TFs alter long - range chromatin mobility and its organization.

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Type
research article
DOI
10.1073/pnas.2311374121
Web of Science ID

WOS:001224119200002

Author(s)
Shaban, Haitham A.  
•
Friman, Elias T.
•
Deluz, Cedric
•
Tollenaere, Armelle  
•
Katanayeva, Natalya  
•
Suter, David M.  
Date Issued

2024-04-30

Publisher

National Academy of Sciences

Published in
Proceedings Of The National Academy Of Sciences Of The United States Of America (PNAS)
Volume

121

Issue

18

Article Number

e2311374121

Subjects

Chromatin

•

Nucleosome Imaging

•

Genome Organization

•

Biophysics

•

Transcription Factors

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
UPSUTER  
FunderGrant Number

European Union

754462

Swiss NSF

P500PB_206805

Swiss National Science Foundation (SNF)

P500PB_206805

Available on Infoscience
June 5, 2024
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/208374
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