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Inhibition of DNA damage-induced apoptosis through Cdc7-mediated stabilization of Tob

Toru Suzuki1, Junko Tsuzuku, Akiyo Hayashi

  • 1Department of Cancer Biology, Division of Oncology, Institute of Medical Science, University of Tokyo, 4-6-1 Shirokanedai, Tokyo 108-8639, Japan.

The Journal of Biological Chemistry
|October 16, 2012
PubMed
Abstract

Insights

The DNA replication kinase Cdc7 prevents cell death in DNA-damaged cells. Cdc7 stabilizes the Tob protein by inhibiting its degradation, thus promoting cell survival during DNA repair.

Area of Science:

  • Cellular Biology
  • Molecular Biology
  • Genetics

Background:

  • Preventing unnecessary cell death is crucial for DNA repair in damaged cells.
  • Understanding how cells escape apoptosis during DNA repair is vital for maintaining genomic integrity.
  • Cells balance proliferation arrest and apoptosis to manage DNA damage.

Purpose of the Study:

  • To investigate the role of Cdc7 in preventing cell death in DNA-damaged cells.
  • To elucidate the mechanism by which DNA-damaged cells maintain viability.
  • To identify signaling pathways that promote cell survival post-DNA damage.

Main Methods:

  • Investigated the effect of Cdc7 on Tob protein levels and degradation.
  • Examined the interaction between Cdc7 and Tob.
  • Analyzed the role of Cul4-DDB1(Cdt2) complex in Tob ubiquitination and degradation.
  • Assessed cell viability in response to DNA damage in the presence and absence of Cdc7.

Main Results:

  • Cdc7 inhibits the Cul4-DDB1(Cdt2)-dependent degradation of Tob.
  • Cdc7 phosphorylates and interacts with Tob, stabilizing it.
  • Cells lacking Cdc7 undergo apoptosis after mild DNA damage due to Tob degradation.
  • Mild DNA damage leads to increased Tob levels via transcriptional and stabilization mechanisms, inhibiting apoptosis.

Conclusions:

  • Cdc7 is a key pro-survival kinase that maintains the viability of DNA-damaged cells.
  • Cdc7 promotes cell survival by stabilizing Tob and counteracting the Tob degradation system.
  • The Cdc7-Tob pathway represents an essential pro-survival signaling mechanism in response to DNA damage.

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