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Protein-intrinsic properties and context-dependent effects regulate pioneer factor binding and function.

Tyler J Gibson1, Elizabeth D Larson1, Melissa M Harrison2

  • 1Department of Biomolecular Chemistry, University of Wisconsin-Madison, Madison, WI, USA.

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Summary
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Pioneer transcription factors open chromatin, but their cell-specific activity is unclear. This study shows chromatin occupancy levels, influenced by multiple factors, determine pioneering activity, which exists on a spectrum.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Developmental Biology

Background:

  • Chromatin acts as a barrier to transcription factor binding.
  • Pioneer factors can access nucleosomal targets and initiate chromatin opening.
  • The mechanisms controlling pioneer factor binding and chromatin opening remain poorly understood.

Purpose of the Study:

  • To investigate the mechanisms governing pioneer transcription factor occupancy.
  • To determine the relationship between chromatin occupancy and chromatin opening.
  • To understand the cell-type specificity of pioneer factor activity.

Main Methods:

  • Studied three Drosophila transcription factors: Zelda, Grainy head, and Twist.
  • Assessed the role of chromatin occupancy level in pioneering activity.
  • Investigated factors regulating occupancy, including motif content, local chromatin, and protein concentration.
  • Examined the contribution of regions outside the DNA-binding domain.

Main Results:

  • Chromatin occupancy level is a key determinant of pioneering activity.
  • Motif content, local chromatin environment, and protein concentration influence pioneer factor occupancy.
  • Regions outside the DNA-binding domain are essential for both binding and chromatin opening.
  • Pioneering activity is not binary but exists on a spectrum.

Conclusions:

  • Pioneer factor activity is regulated by protein-intrinsic features and cell-type-specific factors.
  • Chromatin occupancy is a critical, tunable feature of pioneering transcription factors.
  • Understanding pioneer factor regulation provides insights into gene regulation and development.