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Related Experiment Video

Updated: Aug 27, 2025

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XPF activates break-induced telomere synthesis.

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Alternative Lengthening of Telomeres (ALT) is initiated by telomeric repeat-containing RNA (TERRA) forming R-loops. These R-loops recruit XPF, triggering DNA damage response and telomere synthesis to drive ALT.

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Area of Science:

  • Genetics
  • Molecular Biology
  • Cancer Research

Background:

  • Alternative Lengthening of Telomeres (ALT) is a telomere maintenance mechanism independent of telomerase.
  • The initiation of ALT remains poorly understood.
  • Telomeric repeat-containing RNA (TERRA) forms R-loops at ALT telomeres.

Purpose of the Study:

  • To elucidate the mechanism by which cells initiate ALT.
  • To investigate the role of TERRA and R-loops in ALT.
  • To identify key proteins involved in ALT initiation.

Main Methods:

  • RNA-targeting Cas9 for TERRA depletion.
  • Analysis of ALT-associated PML bodies, telomere clustering, and telomere lengthening.
  • TERRA interactome analysis.
  • Recruitment assays for DNA repair proteins (XPF, BRCA1, RAD51).

Main Results:

  • TERRA depletion reduces ALT hallmarks.
  • TERRA interacts with numerous DNA repair proteins in ALT cells.
  • XPF is recruited by telomeric R-loops to ALT telomeres.
  • XPF induces DNA damage response (DDR) and triggers break-induced telomere synthesis.
  • XPF is essential for BRCA1 and RAD51 recruitment to telomeres in specific contexts.

Conclusions:

  • Telomeric R-loops activate DDR via XPF to promote homologous recombination and telomere replication.
  • This mechanism drives Alternative Lengthening of Telomeres (ALT).
  • TERRA and XPF are critical for ALT initiation and maintenance.