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Ectopic expression of human Cdk2 and its yeast homolog, Ime2, is deleterious to Saccharomyces cerevisiae

Moran Szwarcwort-Cohen1, Vyacheslav Gurevich, Shira Sagee

  • 1Department of Biology, Technion, Israel Institute of Technology, Haifa, Israel.

Cell Cycle (Georgetown, Tex.)
|November 25, 2010
PubMed

Insights

Human cyclin-dependent kinase 2 (hCdk2) can promote cell cycle progression in yeast, but overexpression causes G1-S transition defects and DNA damage sensitivity. This highlights the critical role of precise CDK levels in cell cycle regulation.

Area of Science:

  • Cell Biology
  • Molecular Biology
  • Genetics

Background:

  • Cell cycle progression relies on tightly regulated cyclin-dependent kinases (CDKs).
  • CDK dysregulation is implicated in cancer development.
  • The precise in vivo function of Cdk2 remains unclear, contrasting with in vitro findings.

Purpose of the Study:

  • To investigate the function of human Cdk2 (hCdk2) using budding yeast as a model system.
  • To explore the effects of hCdk2 expression levels on cell cycle progression and viability.
  • To examine potential genetic interactions between hCdk2 and the DNA damage checkpoint.

Main Methods:

  • Utilized budding yeast (Saccharomyces cerevisiae) with a temperature-sensitive yCDK1 mutation.
  • Expressed varying levels of hCdk2 and its yeast homolog, Ime2.
  • Assessed cell viability, G1-S transition, and DNA damage response (Rad53 activation) in wild-type and RAD53-deleted cells following MMS treatment.

Main Results:

  • Low to moderate hCdk2 expression promoted S phase in yCDK1 mutant cells.
  • Overexpression of hCdk2 or Ime2 led to G1-S transition defects and reduced cell viability.
  • Cells overexpressing hCdk2 or Ime2 exhibited increased sensitivity in RAD53-deleted backgrounds and delayed Rad53 activation upon DNA damage.

Conclusions:

  • Precise control of CDK levels, not just expression, is crucial for normal cell cycle progression.
  • hCdk2 and Ime2 share functional similarities and interact with the DNA damage checkpoint.
  • Budding yeast serves as a valuable model for dissecting CDK functions and their roles in cell cycle control and DNA damage response.

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