Molecular architecture of transcription factor hotspots in early adipogenesis

Rasmus Siersbæk, Songjoon Baek, Atefeh Rabiee, Ronni Nielsen, Sofie Traynor, Nicholas Clark, Albin Sandelin, Ole N Jensen, Myong-Hee Sung, Gordon L Hager, Susanne Mandrup

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

Abstract

Transcription factors have recently been shown to colocalize in hotspot regions of the genome, which are further clustered into super-enhancers. However, the detailed molecular organization of transcription factors at hotspot regions is poorly defined. Here, we have used digital genomic footprinting to precisely define factor localization at a genome-wide level during the early phase of 3T3-L1 adipocyte differentiation, which allows us to obtain detailed molecular insight into how transcription factors target hotspots. We demonstrate the formation of ATF-C/EBP heterodimers at a composite motif on chromatin, and we suggest that this may be a general mechanism for integrating external signals on chromatin. Furthermore, we find evidence of extensive recruitment of transcription factors to hotspots through alternative mechanisms not involving their known motifs and demonstrate that these alternative binding events are functionally important for hotspot formation and activity. Taken together, these findings provide a framework for understanding transcription factor cooperativity in hotspots.

OriginalsprogEngelsk
TidsskriftCell Reports
Vol/bind7
Udgave nummer5
Sider (fra-til)1434-1442
Antal sider9
DOI
StatusUdgivet - 12. jun. 2014

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