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Guided nuclear exploration increases CTCF target search efficiency.

Anders S Hansen1,2,3,4,5, Assaf Amitai6, Claudia Cattoglio1,2,3,4

  • 1Department of Molecular and Cell Biology, University of California, Berkeley, Berkeley, CA, USA.

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Summary
This summary is machine-generated.

CCCTC-binding factor (CTCF) uses transient trapping in clusters to efficiently find target DNA sites. This RNA-binding region-dependent mechanism enhances search efficiency in large mammalian genomes.

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Area of Science:

  • Molecular Biology
  • Genomics
  • Biophysics

Background:

  • Mammalian genomes are vast, presenting challenges for DNA-binding proteins to locate specific target sites among numerous off-target locations.
  • The mechanism by which DNA-binding proteins efficiently navigate these large genomes remains largely unknown.

Purpose of the Study:

  • To investigate how CCCTC-binding factor (CTCF) efficiently locates its target DNA sites within the mammalian genome.
  • To elucidate the role of CTCF's internal RNA-binding region (RBRi) in its dynamic behavior and target search efficiency.

Main Methods:

  • Live-cell single-molecule tracking was employed to observe CTCF dynamics in real-time.
  • A novel theoretical model, anisotropic diffusion through transient trapping in zones, was developed to interpret CTCF movement patterns.
  • The functional impact of the internal RNA-binding region (RBRi) on CTCF dynamics and target search was assessed.

Main Results:

  • CTCF molecules were observed to undergo repeated transient trapping in small zones, likely representing CTCF clusters.
  • CTCF dynamics and trapping were significantly dependent on its internal RNA-binding region (RBRi).
  • Transient RBRi-mediated trapping was found to increase the efficiency of CTCF target site identification by approximately 2.5-fold.

Conclusions:

  • CTCF utilizes a 'guided' search mechanism, where CTCF clusters concentrate diffusing proteins near cognate binding sites.
  • This local concentration effect increases the local ON-rate of CTCF binding to its targets.
  • The findings suggest that local guiding by protein clusters may be a general strategy for DNA-binding proteins to efficiently locate targets in large genomes.