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MORC2 regulates DNA damage response through a PARP1-dependent pathway.

Lin Zhang1,2, Da-Qiang Li1,2,3,4

  • 1Shanghai Cancer Center and Institutes of Biomedical Sciences, Shanghai Medical College, Fudan University, Shanghai 200032, China.

Nucleic Acids Research
|October 17, 2019
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Summary

Poly(ADP-ribose) polymerase 1 (PARP1) modifies Microrchidia family CW-type zinc finger 2 (MORC2) to enhance DNA damage repair. MORC2 stabilizes PARP1, improving cellular response to genotoxic stress.

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Area of Science:

  • Molecular Biology
  • Cellular Biology
  • Biochemistry

Background:

  • Microrchidia family CW-type zinc finger 2 (MORC2) is a chromatin remodeler involved in DNA damage response (DDR).
  • The precise mechanism of MORC2 in DDR is not fully understood.

Purpose of the Study:

  • To elucidate the mechanism by which MORC2 functions in the DNA damage response.
  • To investigate the interaction and functional relationship between MORC2 and poly(ADP-ribose) polymerase 1 (PARP1).

Main Methods:

  • Co-immunoprecipitation to detect protein interactions.
  • In vitro PARylation assays to confirm enzymatic activity.
  • Site-directed mutagenesis to assess the role of specific residues.
  • Western blotting to analyze protein stability and modification.
  • Cell viability assays to evaluate genotoxic stress response.

Main Results:

  • PARP1 directly interacts with and PARylates MORC2 at its CW-type zinc finger domain.
  • PARP1-mediated MORC2 PARylation enhances MORC2's ATPase and chromatin remodeling activities.
  • MORC2 stabilizes PARP1 by promoting its acetylation, thereby preventing ubiquitination and degradation.
  • MORC2 depletion or impaired PARP1 acetylation reduces DNA repair protein recruitment and increases sensitivity to DNA damage.

Conclusions:

  • MORC2 and PARP1 form a crucial regulatory axis in the cellular DNA damage response.
  • MORC2's activity and stability are regulated by PARP1, and MORC2, in turn, stabilizes PARP1.
  • This interplay is essential for efficient DNA repair and maintaining genomic stability.