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Transcription Factors Orchestrate Dynamic Interplay Between Genome Topology And Gene Regulation During Cell Reprogramming

By Ralph Stadhouders, Enrique Vidal, Fran├žois Serra, Bruno Di Stefano, Fran├žois le Dily, Javier Quilez, Antonio Gomez, Samuel Collombet, Clara Berenguer, Yasmina Cuartero, Jochen Hecht, Guillaume Filion, Miguel Beato, Marc A. Marti-Renom, Thomas Graf

Posted 30 Apr 2017
bioRxiv DOI: 10.1101/132456 (published DOI: 10.1038/s41588-017-0030-7)

Chromosomal architecture is known to influence gene expression, yet its role in controlling cell fate remains poorly understood. Reprogramming of somatic cells into pluripotent stem cells by the transcription factors (TFs) Oct4, Sox2, Klf4 and Myc offers an opportunity to address this question but is severely limited by the low proportion of responding cells. We recently developed a highly efficient reprogramming protocol that synchronously converts somatic into pluripotent stem cells. Here, we employ this system to integrate time-resolved changes in genome topology with gene expression, TF binding and chromatin state dynamics. This revealed that TFs drive topological genome reorganization at multiple architectural levels, which often precedes changes in gene expression. Removal of locus-specific topological barriers can explain why pluripotency genes are activated sequentially, instead of simultaneously, during reprogramming. Taken together, our study implicates genome topology as an instructive force for implementing transcriptional programs and cell fate in mammals.

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