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Related Experiment Videos

In vitro cell cycle arrest induced by using artificial DNA templates.

S Kornbluth1, C Smythe, J W Newport

  • 1Department of Biology, University of California, San Diego, La Jolla 92093.

Molecular and Cellular Biology
|July 1, 1992
PubMed
Summary

Artificial DNA templates like M13 single-stranded DNA can block mitosis in Xenopus egg extracts by triggering a feedback pathway. Single-stranded DNA is more effective than double-stranded DNA at inhibiting cell cycle progression.

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Biochemistry

Background:

  • Cell cycle progression is regulated by checkpoints that prevent entry into mitosis until DNA replication is complete.
  • In Xenopus egg extracts, incompletely replicated DNA triggers a feedback mechanism that inhibits the onset of mitosis.

Purpose of the Study:

  • To investigate the role of artificial DNA templates in triggering the DNA replication checkpoint.
  • To elucidate the signal transduction pathway from DNA templates to the inhibition of mitosis.

Main Methods:

  • Utilized Xenopus egg extracts as a cell-free system.
  • Introduced artificial DNA templates, including M13 single-stranded DNA and double-stranded plasmid DNA.
  • Measured tyrosine kinase activity and p34cdc2 phosphorylation levels.

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Main Results:

  • Both single-stranded M13 DNA and double-stranded plasmid DNA inhibited mitosis in Xenopus egg extracts.
  • Single-stranded M13 DNA was more potent than double-stranded plasmid DNA in blocking mitosis.
  • Elevated tyrosine kinase activity, leading to p34cdc2 phosphorylation and maturation-promoting factor inactivation, was observed with specific DNA template concentrations.

Conclusions:

  • Artificial DNA templates can effectively mimic the effects of incompletely replicated DNA in triggering the cell cycle checkpoint.
  • The study provides a simplified system to analyze the DNA-to-tyrosine kinase signal transduction pathway regulating mitosis.
  • Findings highlight the differential efficacy of single-stranded versus double-stranded DNA in activating this cell cycle inhibitory mechanism.