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Two distinct chromatin modules regulate proinflammatory gene expression.

Isabelle Seufert1,2, Irene Gerosa1,2, Vassiliki Varamogianni-Mamatsi3

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Researchers identified two distinct gene regulation mechanisms in human cells: autonomous links of co-accessibility (ACs) and domains of contiguous co-accessibility (DCs). These findings reveal how cells precisely control gene expression, particularly during inflammation.

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Area of Science:

  • Genomics
  • Molecular Biology
  • Cell Biology

Background:

  • Gene activation involves mechanisms like enhancer-promoter interactions and transcription factor hubs.
  • Genome-wide studies on distinct endogenous gene regulation mechanisms in primary human cells are limited.

Purpose of the Study:

  • To investigate mechanistic differences in gene regulation within primary human endothelial cells.
  • To dissect the proinflammatory gene expression program induced by tumor necrosis factor (TNF).

Main Methods:

  • Utilized sequencing- and imaging-based methods for comprehensive analysis.
  • Employed co-accessibility analysis of single-cell chromatin accessibility data.
  • Developed and used the RWireX software for data analysis.

Main Results:

  • Identified two distinct regulatory chromatin modules: autonomous links of co-accessibility (ACs) and domains of contiguous co-accessibility (DCs).
  • ACs involve co-accessibility between separated genomic sites, while DCs feature contiguous co-accessibility with increased local transcription factor binding.
  • Observed differential TNF-dependent induction timing, strength, and transcriptional bursting kinetics for genes in AC and DC modules.

Conclusions:

  • The study reveals functionally distinct regulatory mechanisms associated with ACs and DCs.
  • These findings offer a framework for understanding rapid and precise gene expression control in cells.
  • Highlights the importance of distinct chromatin structures in orchestrating cellular responses.