RAR/RXR binding dynamics distinguish pluripotency from differentiation associated cis-regulatory elements
Résumé
In mouse embryonic cells, ligand-activated retinoic acid receptors (RARs) play a key role in inhibiting pluripotency-maintaining genes and activating some major actors of cell differentiation. To investigate the mechanism underlying this dual regulation, we performed joint RAR/RXR ChIP-seq and mRNA-seq time series during the first 48 h of the RA-induced Primitive Endoderm (PrE) differentiation process in F9 embryonal carcinoma (EC) cells. We show here that this dual regulation is associated with RAR/RXR genomic redistribution during the differentiation process. In-depth analysis of RAR/RXR binding sites occupancy dynamics and composition show that in undifferentiated cells, RAR/RXR interact with genomic regions characterized by binding of pluripotency-associated factors and high prevalence of the non-canonical DR0-containing RA response element. By contrast, in differentiated cells, RAR/RXR bound regions are enriched in functional Sox17 binding sites and are characterized with a higher frequency of the canonical DR5 motif. Our data offer an unprecedentedly detailed view on the action of RA in triggering pluripotent cell differentiation and demonstrate that RAR/RXR action is mediated via two different sets of regulatory regions tightly associated with cell differentiation status.
Mots clés
in vitro study
gene cluster
gene expression profiling
messenger RNA
retinoic acid receptor
retinoid X receptor
transcription factor Sox17
animal cell
Article
binding site
cell differentiation
chromatin immunoprecipitation
controlled study
DNA responsive element
embryo
endoderm
in vivo study
mouse
nonhuman
pluripotent stem cell
priority journal
receptor binding
receptor occupancy
regulatory sequence
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