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2018 ; 28
(3
): 295-309
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Thrombopoietin signaling to chromatin elicits rapid and pervasive epigenome
remodeling within poised chromatin architectures
#MMPMID29429976
Comoglio F
; Park HJ
; Schoenfelder S
; Barozzi I
; Bode D
; Fraser P
; Green AR
Genome Res
2018[Mar]; 28
(3
): 295-309
PMID29429976
show ga
Thrombopoietin (TPO) is a critical cytokine regulating hematopoietic stem cell
maintenance and differentiation into the megakaryocytic lineage. However, the
transcriptional and chromatin dynamics elicited by TPO signaling are poorly
understood. Here, we study the immediate early transcriptional and cis-regulatory
responses to TPO in hematopoietic stem/progenitor cells (HSPCs) and use this
paradigm of cytokine signaling to chromatin to dissect the relationship between
cis-regulatory activity and chromatin architecture. We show that TPO profoundly
alters the transcriptome of HSPCs, with key hematopoietic regulators being
transcriptionally repressed within 30 min of TPO. By examining cis-regulatory
dynamics and chromatin architectures, we demonstrate that these changes are
accompanied by rapid and extensive epigenome remodeling of cis-regulatory
landscapes that is spatially coordinated within topologically associating domains
(TADs). Moreover, TPO-responsive enhancers are spatially clustered and engage in
preferential homotypic intra- and inter-TAD interactions that are largely
refractory to TPO signaling. By further examining the link between cis-regulatory
dynamics and chromatin looping, we show that rapid modulation of cis-regulatory
activity is largely independent of chromatin looping dynamics. Finally, we show
that, although activated and repressed cis-regulatory elements share remarkably
similar DNA sequence compositions, transcription factor binding patterns
accurately predict rapid cis-regulatory responses to TPO.