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In Vivo Imaging Uncovers the Migratory Behavior of Leukocytes within the Joints
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Brd4 is on the move during inflammation.

Yali Xu1, Christopher R Vakoc2

  • 1Cold Spring Harbor Laboratory, One Bungtown Road, Cold Spring Harbor, NY 11724, USA; Molecular and Cellular Biology Program, Stony Brook University, Stony Brook, NY 11794, USA.

Trends in Cell Biology
|October 8, 2014
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Summary

Signal-dependent transcription factors like NF-kB regulate enhancers by changing Brd4 occupancy. This finding offers new insights into enhancer dynamics and therapeutic strategies using BET bromodomain inhibitors.

Keywords:
BET bromodomainBrd4JQ1NF-kBenhancerinflammationp65super-enhancer

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Area of Science:

  • Molecular Biology
  • Genomics
  • Epigenetics

Background:

  • Enhancer activity is crucial for gene regulation and is controlled by transcription factors.
  • Signal-dependent transcription factors dynamically regulate gene expression in response to cellular signals.
  • Brd4, a BET bromodomain protein, is a key coactivator involved in transcriptional regulation.

Purpose of the Study:

  • To investigate how signal-dependent transcription factors influence global enhancer landscapes.
  • To explore the role of NF-kB in modulating enhancer activity.
  • To understand the interaction between NF-kB, Brd4, and enhancer function.

Main Methods:

  • Genome-wide occupancy analysis of Brd4.
  • Chromatin immunoprecipitation followed by sequencing (ChIP-seq).
  • Analysis of enhancer activity in response to NF-kB signaling.

Main Results:

  • NF-kB signaling alters the genome-wide occupancy of Brd4.
  • Brd4 redistribution by NF-kB impacts global enhancer activity.
  • Specific enhancers show dynamic changes in Brd4 binding upon NF-kB activation.

Conclusions:

  • NF-kB acts as a key regulator of enhancer dynamics by modulating Brd4 localization.
  • This mechanism provides a new understanding of how signal-dependent transcription factors shape enhancer landscapes.
  • Findings suggest potential therapeutic avenues targeting BET bromodomain proteins for diseases involving aberrant enhancer activity.