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Related Experiment Videos

DNA replication: building the perfect switch.

J F Diffley1

  • 1ICRF Clare Hall Laboratories, South Mimms, EN6 3LD, UK. J.Diffley@icrf.icnet.uk

Current Biology : CB
|May 23, 2001
PubMed
Summary
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A molecular switch controls DNA replication, ensuring it occurs only once per cell cycle. This process involves the degradation of geminin, a replication inhibitor, by the anaphase-promoting complex/cyclosome.

Area of Science:

  • Molecular Biology
  • Cell Cycle Regulation
  • Biochemistry

Background:

  • DNA replication must be precisely regulated to occur only once per cell cycle.
  • Geminin is a known inhibitor of DNA replication.
  • The anaphase-promoting complex/cyclosome (APC/C) is a key regulator of cell cycle progression.

Purpose of the Study:

  • To elucidate the role of geminin proteolysis in the regulation of DNA replication origin firing.
  • To understand the molecular mechanism by which the APC/C controls the cell cycle-dependent activation of replication origins.

Main Methods:

  • Investigating the interaction between geminin and the APC/C.
  • Analyzing the degradation of geminin during the cell cycle.
  • Assessing the impact of geminin depletion or APC/C inhibition on DNA replication.

Related Experiment Videos

Main Results:

  • Demonstrated that the APC/C directly targets geminin for degradation.
  • Showed that geminin proteolysis is essential for the timely activation of replication origins.
  • Identified the APC/C as a critical component of the molecular switch that prevents re-replication.

Conclusions:

  • The degradation of geminin by the APC/C is a crucial step in ensuring the fidelity of DNA replication.
  • This regulatory mechanism acts as a sophisticated molecular switch, guaranteeing that DNA replication occurs exactly once per cell cycle.