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The basic reaction of homologous recombination (HR) involves two chromatids that contain DNA sequences sharing a significant stretch of identity. One of these sequences uses a strand from another as a template to synthesize DNA in an enzyme-catalyzed reaction. The final product is a novel amalgamation of the two substrates. To ensure an accurate recombination of sequences, HR is restricted to the S and G2 phases of the cell cycle. At these stages, the DNA has been replicated already and the...
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The double-stranded structure of DNA has two major advantages. First, it serves as a safe repository of genetic information where one strand serves as the back-up in case the other strand is damaged. Second, the double-helical structure can be wrapped around proteins called histones to form nucleosomes, which can then be tightly wound to form chromosomes. This way, DNA chains up to 2 inches long can be contained within microscopic structures in a cell. A double-stranded break not only damages...
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Phase separation in DNA double-strand break response.

Huan-Lei Liu1,2,3,4, Hao Nan4, Wan-Wen Zhao5,6

  • 1Henan Provincial Key Laboratory of Radiation Medicine, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, Henan, P.R. China.

Nucleus (Austin, Tex.)
|December 26, 2023
PubMed
Summary
This summary is machine-generated.

Liquid-liquid phase separation (LLPS) is crucial for efficient DNA double-strand break (DSB) repair by concentrating key molecules at damage sites. Dysregulation of this process can lead to diseases.

Keywords:
DNA damage response (DDR)DNA double-strand break (DSB)condensateshomologous recombination (HR)liquid-liquid phase separation (LLPS)nonhomologous end-joining (NHEJ)

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Area of Science:

  • Molecular Biology
  • Cell Biology
  • Biochemistry

Background:

  • DNA double-strand breaks (DSBs) are highly toxic DNA lesions.
  • Homologous recombination (HR) and nonhomologous end-joining (NHEJ) are primary DSB repair pathways.
  • Emerging evidence highlights the role of liquid-liquid phase separation (LLPS) in biological processes.

Purpose of the Study:

  • To provide a comprehensive overview of LLPS in DNA double-strand break repair.
  • To elucidate the regulatory mechanisms of phase separation in DNA damage response (DDR).

Main Methods:

  • Literature review of recent studies on LLPS and DNA repair.
  • Analysis of the role of biomolecular condensates in DSB response.
  • Examination of disease associations with dysregulated phase separation.

Main Results:

  • LLPS facilitates rapid recruitment of essential biomolecules to DSB sites.
  • Phase separation enhances the efficiency and speed of DNA repair processes.
  • Aberrant LLPS of DSB repair factors is linked to various pathologies.

Conclusions:

  • LLPS is a critical mechanism for effective DNA double-strand break repair.
  • Understanding LLPS in DDR is vital for comprehending disease development.
  • Targeting phase separation dynamics may offer therapeutic strategies for DNA damage-related diseases.