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Updated: Dec 15, 2025

Visualization of DNA Repair Proteins Interaction by Immunofluorescence
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Repair pathway choice for double-strand breaks.

Yixi Xu1, Dongyi Xu1

  • 1State Key Laboratory of Protein and Plant Gene Research, School of Life Sciences, Peking University, Beijing 100871, China.

Essays in Biochemistry
|July 11, 2020
PubMed
Summary

DNA double-strand breaks (DSBs) are repaired by nonhomologous end-joining (NHEJ) or homologous recombination (HR). DNA end resection length dictates pathway choice, with factors like BRCA1 promoting HR and 53BP1 promoting NHEJ.

Keywords:
53BP1BIRBRCA1PTIPRIF1shieldin

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Area of Science:

  • Molecular Biology
  • Genetics
  • Cell Biology

Background:

  • Deoxyribonucleic acid (DNA) is susceptible to damage, leading to DNA double-strand breaks (DSBs) that threaten genomic integrity.
  • Two primary repair pathways exist: nonhomologous end-joining (NHEJ) and homologous recombination (HR).

Purpose of the Study:

  • To summarize key factors influencing DNA double-strand break repair pathway selection.
  • To discuss recent advancements in understanding NHEJ and HR pathway choice.

Main Methods:

  • Review of scientific literature on DNA repair mechanisms.
  • Analysis of factors controlling DNA end resection and pathway choice.

Main Results:

  • DNA end resection length is critical for determining NHEJ versus HR pathway usage.
  • Proteins such as 53BP1 and BRCA1, along with their cofactors, play opposing roles in promoting NHEJ or HR.
  • Cell cycle, chromatin, and break complexity influence DNA resection and repair pathway selection.

Conclusions:

  • Understanding the molecular mechanisms governing DSB repair pathway selection is crucial for maintaining genomic stability.
  • Further research into these factors may reveal therapeutic targets for diseases involving DNA repair deficiencies.