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Consequences of abnormal CDK activity in S phase.

Silje Anda1, Christiane Rothe1, Erik Boye1

  • 1a Department of Radiation Biology , Institute for Cancer Research, Oslo University Hospital , Oslo , Montebello , Norway.

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Summary

Altering Cyclin Dependent Kinase (CDK) activity in fission yeast S phase impacts DNA replication. Increased CDK activity leads to replication stress and DNA damage, while decreased activity confers stress resistance.

Keywords:
CDKCdc25Cell cycleMik1S phaseWee1fission yeastreplication stress

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Genetics

Background:

  • Cyclin Dependent Kinases (CDKs) are crucial for regulating DNA replication.
  • The fission yeast CDK, Cdc2, plays a central role in cell cycle progression.
  • Understanding CDK regulation during S phase is vital for comprehending DNA replication fidelity.

Purpose of the Study:

  • To investigate the effects of modulating Cdc2 activity during S phase in fission yeast.
  • To identify key regulators of Cdc2 activity specifically within the S phase.
  • To determine the consequences of both increased and decreased CDK activity on DNA replication and stress response.

Main Methods:

  • Utilized fission yeast mutants (wee1 and cdc25) to alter Cdc2 activity.
  • Assessed DNA replication by measuring EdU incorporation.
  • Quantified active replication forks through chromatin-bound Cdc45 detection.
  • Evaluated DNA damage accumulation, particularly in the absence of the S-phase checkpoint.

Main Results:

  • Wee1 was identified as a significant regulator of Cdc2 activity during S phase, with wee1 mutants exhibiting increased replication stress and DNA damage.
  • Increased CDK activity in wee1 mutants correlated with higher EdU incorporation and more chromatin-bound Cdc45, indicating altered DNA replication.
  • Cdc25 is essential for Cdc2 activation in S phase; cdc25 mutants showed enhanced tolerance to replication stress, suggesting reduced CDK activity confers resistance.

Conclusions:

  • Wee1 plays a more prominent role in S-phase regulation than previously thought.
  • Elevated CDK activity during S phase can lead to replication stress and DNA damage, especially when checkpoints are compromised.
  • Reduced CDK activity during S phase appears to confer a protective advantage against certain types of replication stress.