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Related Experiment Video

Updated: Sep 18, 2025

Author Spotlight: Advanced Single-Molecule Techniques for Investigating Telomeric Protein-DNA Interactions
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Telomeres stall DNA loop extrusion by condensin.

Brian T Analikwu1, Alice Deshayes2, Jaco van der Torre1

  • 1Kavli Institute of Nanoscience Delft, Delft University of Technology, Delft, the Netherlands.

Cell Reports
|June 25, 2025
PubMed
Summary
This summary is machine-generated.

Dense arrays of telomeric proteins like Rap1 can halt DNA loop extrusion by SMC proteins. This interaction impacts chromatin organization and chromosome resolution, particularly in yeast.

Keywords:
CP: Molecular biologySMC complexesSaccharomyces cerevisiaechromatincondensindicentric chromosomeloop extrusionsingle-molecule assaytelomere

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Area of Science:

  • Molecular Biology
  • Chromatin Biology
  • Genetics

Background:

  • DNA loop extrusion by SMC proteins is crucial for chromosome organization.
  • The interaction between loop extruders and telomeres, which are protein-rich, remains poorly understood.

Purpose of the Study:

  • To investigate the interaction between loop-extruding condensin and Rap1, a key telomeric DNA-binding protein in Saccharomyces cerevisiae.
  • To understand how dense protein arrays at telomeres affect DNA loop extrusion.

Main Methods:

  • Employed complementary in vivo and in vitro single-molecule approaches.
  • Utilized a microscopy-based approach to monitor chromatin decompaction in anaphase cells.

Main Results:

  • Demonstrated that dense linear Rap1 arrays can completely block DNA loop extrusion by condensin.
  • Showed that blocking efficiency depends on Rap1 array length and DNA gap size.
  • Observed condensin accumulation and local chromatin decompaction caused by Rap1 arrays in anaphase cells.

Conclusions:

  • Linear arrays of DNA-bound proteins can effectively halt DNA loop extrusion by SMC proteins.
  • This mechanism has implications for telomere functions, transcription, and DNA repair.
  • Findings suggest a role in resolving dicentric chromosomes formed by telomere fusions.