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Fixing Double-strand Breaks02:04

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Updated: Mar 6, 2026

Characterizing DNA Repair Processes at Transient and Long-lasting Double-strand DNA Breaks by Immunofluorescence Microscopy
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Characterizing DNA Repair Processes at Transient and Long-lasting Double-strand DNA Breaks by Immunofluorescence Microscopy

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DNA double-strand break response at a glance.

Francesca Esposito1,2, Sofia Francia1

  • 1Istituto di Genetica Molecolare, CNR - Consiglio Nazionale delle Ricerche, Pavia 27100, Italy.

Journal of Cell Science
|March 5, 2026
PubMed
Summary

DNA double-strand breaks (DSBs) are critical DNA lesions. The DNA damage response (DDR) network coordinates chromatin dynamics for efficient DSB repair, preserving genome integrity within the dynamic epigenome.

Keywords:
ChromatinDDRDNA damage repair pathwaysDouble strand breaks

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Area of Science:

  • Genomics
  • Molecular Biology
  • Cell Biology

Background:

  • DNA double-strand breaks (DSBs) are highly cytotoxic DNA lesions arising from internal and external sources.
  • Failure to repair DSBs leads to genomic instability, cell death, and disrupted tissue homeostasis.
  • The DNA damage response (DDR) is a complex network for detecting, signaling, and repairing DNA lesions.

Purpose of the Study:

  • To explore the interplay between local and global chromatin dynamics in DSB repair.
  • To understand how chromatin modifications and remodelling facilitate DSB repair.
  • To elucidate the role of three-dimensional nuclear organization in preserving genome integrity.

Main Methods:

  • Review of current literature on DNA damage response pathways.
  • Analysis of chromatin dynamics during DNA repair.
  • Exploration of nuclear organization and its impact on DSB repair.

Main Results:

  • DDR involves rapid recruitment of sensors, mediators, and kinases to DSB sites.
  • Local chromatin modifications and remodelling influence transcriptional activity near DSBs.
  • Persistent DSBs are relocated to specific nuclear domains, and chromatin reorganizes spatially for repair.

Conclusions:

  • Coordinated local and global chromatin dynamics are essential for efficient DSB repair.
  • The dynamic epigenome plays a crucial role in orchestrating DSB repair and maintaining genome integrity.
  • Understanding these processes is vital for comprehending tissue homeostasis and disease development.