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BRD2 compartmentalizes the accessible genome.

Liangqi Xie1,2, Peng Dong1, Yifeng Qi3

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|April 12, 2022
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Summary
This summary is machine-generated.

The bromodomain and extraterminal (BET) protein BRD2 drives active chromatin compartmentalization independently of transcription. This process involves BRD2 recognizing acetylated targets and is modulated by cohesin and BRD4.

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Area of Science:

  • Chromatin biology
  • Epigenetics
  • Molecular mechanisms of genome organization

Background:

  • Mammalian chromosomes exhibit large-scale compartmentalization and smaller topologically associating domains (TADs).
  • Cohesin is essential for TAD formation, but the mechanisms governing larger compartmentalization remain unclear.

Purpose of the Study:

  • To elucidate the molecular mechanisms underlying chromatin compartmentalization.
  • To investigate the role of the bromodomain and extraterminal (BET) family protein BRD2 in genome organization.

Main Methods:

  • Experimental manipulation of cohesin levels in mammalian cells.
  • Analysis of chromatin organization using techniques like Hi-C and ChIP.
  • Biochemical assays to study protein-protein and protein-DNA interactions.
  • Polymer simulations to model nuclear topology.

Main Results:

  • BRD2 promotes spatial mixing and compartmentalization of active chromatin, particularly after cohesin depletion.
  • BRD2's function depends on its bromodomain for recognizing acetylated chromatin and its low-complexity domain for interactions with binding partners.
  • BRD2-mediated compartmentalization is antagonized by cohesin and BRD4, which inhibit BRD2 binding to chromatin.
  • Polymer simulations support a model where BRD2 and cohesin compete, influencing nuclear topology.

Conclusions:

  • BRD2 plays a critical role in establishing active chromatin compartments, independent of transcriptional activity.
  • A dynamic interplay between BRD2 and cohesin governs genome compartmentalization through competing mechanisms.
  • Understanding this interplay provides insights into the principles of nuclear architecture and genome organization.