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The Chromatin Response to Double-Strand DNA Breaks and Their Repair

Radoslav Aleksandrov1, Rossitsa Hristova1, Stoyno Stoynov1

  • 1Roumen Tsanev Institute of Molecular Biology, Bulgarian Academy of Sciences, Acad. G. Bonchev Str. 21, 1113 Sofia, Bulgaria.

Cells
|August 14, 2020
PubMed

Insights

Cells repair severe DNA double-strand breaks (DSBs) using complex protein pathways within dynamic chromatin. Understanding this process is crucial for developing new cancer therapies targeting DSB repair mechanisms.

Area of Science:

  • Molecular Biology
  • Genetics
  • Cell Biology

Background:

  • Cellular DNA faces constant damage from internal and external mutagens.
  • Double-strand DNA breaks (DSBs) are severe DNA insults that threaten genomic stability and are linked to cancer.
  • Eukaryotic cells possess intricate DNA repair pathways involving numerous proteins to address DSBs.

Purpose of the Study:

  • To elucidate the role of chromatin in DNA double-strand break repair.
  • To highlight the dynamic nature of chromatin and its influence on DSB repair pathways.
  • To underscore the therapeutic potential of targeting DSB repair in cancer treatment.

Main Methods:

  • The study is a review of existing literature on DNA repair mechanisms.
  • Focuses on the interplay between chromatin structure, histone modifications, and DNA repair proteins.
  • Examines the regulation of DSB repair pathway choice and coordination.

Main Results:

  • Chromatin is an active participant in DSB repair, not merely a passive scaffold.
  • Dynamic chromatin alterations, including histone modifications and remodeling, are essential for efficient DSB repair.
  • These chromatin changes facilitate access to damaged DNA, recruit repair proteins, and regulate their activity.

Conclusions:

  • Proficient DSB repair relies heavily on dynamic chromatin modifications.
  • The intricate regulation of DSB repair by chromatin impacts tumorigenesis and cancer progression.
  • Targeting DSB repair pathways represents a promising strategy for novel anticancer therapies.
Keywords:
DNA damage responsePARP inhibitorsanticancer drug therapiescancerchromatin dynamics in DNA repairdouble-strand DNA break repairhomologous recombinationnon-homologous end joiningsynthetic lethality

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