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Updated: Mar 19, 2026

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Alternative end joining, clonal evolution, and escape from a telomere-driven crisis.

Eric A Hendrickson1, Duncan M Baird2

  • 1Department of Biochemistry; Molecular Biology, and Biophysics ; University of Minnesota Medical School ; Minneapolis, MN USA.

Molecular & Cellular Oncology
|June 17, 2016
PubMed
Summary
This summary is machine-generated.

DNA ligase III (LIG3) helps cells escape crisis after telomere dysfunction. This LIG3-mediated telomere fusion is crucial for tumor clonal evolution and genomic instability.

Keywords:
DNA repaircancerligase IIInon-homologous end joiningtelomerasetelomere

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Area of Science:

  • Genetics
  • Cancer Biology
  • Molecular Biology

Background:

  • Telomere dysfunction and fusion are key drivers of genomic instability and cancer evolution.
  • Cells undergo crisis when telomeres become dysfunctional.

Purpose of the Study:

  • To investigate the role of DNA ligase III (LIG3) in cellular response to telomere dysfunction.
  • To determine if LIG3 facilitates escape from crisis induced by telomere dysfunction.
  • To understand the contribution of LIG3-mediated telomere fusion to clonal evolution.

Main Methods:

  • Cellular assays to assess telomere dysfunction and crisis.
  • Analysis of DNA ligase III (LIG3) activity and localization.
  • Investigating the mechanism of LIG3-mediated telomere fusion.

Main Results:

  • DNA ligase III (LIG3) was found to facilitate the escape of cells from crisis following telomere dysfunction.
  • LIG3 activity is critical for the fusion of dysfunctional telomeres.
  • LIG3-mediated telomere fusion significantly contributes to clonal evolution in cancer cells.

Conclusions:

  • DNA ligase III (LIG3) plays a critical role in overcoming telomere dysfunction-induced crisis.
  • LIG3-mediated telomere fusion is a significant mechanism promoting genomic instability and clonal evolution in tumors.