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Two- and Three-Dimensional Live Cell Imaging of DNA Damage Response Proteins
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Published on: September 28, 2012

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HERC2-USP20 axis regulates DNA damage checkpoint through Claspin

Jian Yuan1, Kuntian Luo2, Min Deng3

  • 1Research Center for Translational Medicine, East Hospital, Tongji University School of Medicine, No. 150 Jimo Road, Shanghai 200120, China Key Laboratory of Arrhythmia, Ministry of Education, East Hospital, Tongji University School of Medicine, No. 150 Jimo Road, Shanghai 200120, China lou.zhenkun@mayo.edu.

Nucleic Acids Research
|October 31, 2014
PubMed

Insights

The deubiquitination enzyme USP20 stabilizes Claspin, enhancing ATR-Chk1 signaling during DNA damage response. This discovery reveals USP20 as a key regulator in the ATR-dependent DNA damage signaling pathway.

Area of Science:

  • Cellular biology
  • Molecular oncology
  • Biochemistry

Background:

  • The DNA damage response (DDR) is crucial for maintaining genomic stability.
  • Post-translational modifications regulate DDR pathways, but ubiquitination's role in ATR signaling remains unclear.
  • Replication stress and single-strand breaks activate ATR signaling, a key component of the DDR.

Purpose of the Study:

  • To investigate the role of ubiquitination in regulating ATR signaling during replication stress.
  • To identify specific deubiquitination enzymes (DUBs) involved in the ATR-dependent DDR pathway.
  • To elucidate the mechanism by which USP20 influences ATR signaling and DNA repair.

Main Methods:

  • Screening of deubiquitination enzymes (DUBs) to identify regulators of replication stress response.
  • Investigating the interaction between USP20, HERC2, and Claspin using biochemical assays.
  • Analyzing the phosphorylation of USP20 by ATR and its effect on protein stability and signaling.

Main Results:

  • USP20 was identified as a critical DUB for replication stress response.
  • ATR phosphorylates USP20, leading to HERC2 dissociation and USP20 stabilization.
  • USP20 deubiquitinates and stabilizes Claspin, thereby enhancing ATR-Chk1 signaling activation.

Conclusions:

  • USP20 is a novel and pivotal regulator of the ATR-dependent DNA damage signaling pathway.
  • USP20's function in stabilizing Claspin is essential for ATR-Chk1 activation under replication stress.
  • Targeting USP20 may offer new therapeutic strategies for DNA damage response-related diseases.

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