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Transcription factors orchestrate dynamic interplay between genome topology and gene regulation during cell reprogramming
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Transcription factors orchestrate dynamic interplay between genome topology and gene regulation during cell reprogramming
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Journal Article
Transcription factors orchestrate dynamic interplay between genome topology and gene regulation during cell reprogramming
2018
Overview
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 (PSCs) 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 have recently developed a highly efficient reprogramming protocol that synchronously converts somatic into pluripotent stem cells. Here, we used this system to integrate time-resolved changes in genome topology with gene expression, TF binding and chromatin-state dynamics. The results showed that TFs drive topological genome reorganization at multiple architectural levels, often before changes in gene expression. Removal of locus-specific topological barriers can explain why pluripotency genes are activated sequentially, instead of simultaneously, during reprogramming. Together, our results implicate genome topology as an instructive force for implementing transcriptional programs and cell fate in mammals.
The authors analyze time-resolved changes in genome topology, gene expression, transcription-factor binding, and chromatin state during iPSC generation. They conclude that 3D genome reorganization generally precedes gene expression changes and that removal of locus-specific topological barriers explains why pluripotency genes are activated sequentially during reprogramming.
Publisher
Nature Publishing Group US,Nature Publishing Group
Subject
/ 45/100
/ 45/15
/ 64/60
/ Animal Genetics and Genomics
/ Animals
/ Biomedical and Life Sciences
/ Cellular Reprogramming - genetics
/ Chromatin Assembly and Disassembly - genetics
/ Chromosome Structures - genetics
/ Chromosome Structures - metabolism
/ Dosage Compensation, Genetic - genetics
/ Female
/ Genome
/ Genomes
/ Genomics
/ Kruppel-Like Transcription Factors - metabolism
/ Kruppel-Like Transcription Factors - physiology
/ Mice
/ Principal components analysis
/ Topology
