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Related Experiment Videos

Comet assay and early apoptosis.

P Choucroun1, D Gillet, G Dorange

  • 1Laboratoire de biogénotoxicologie-I3S, Centre de Toxicovigilance, CHU Morvan, 29609 Brest Cedex, France. pascale.choucroun@univ-brest.fr

Mutation Research
|June 19, 2001
PubMed
Summary

The comet assay, a genotoxicity test, may produce false positives due to apoptosis. Apoptotic cells can create comet images, necessitating careful interpretation alongside apoptosis markers like Yopro-1 staining.

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Area of Science:

  • Cellular biology
  • Genotoxicology
  • Apoptosis research

Background:

  • The comet assay is a standard genotoxicity test.
  • Potential for false positive results in comet assays due to apoptosis has been suspected.
  • Apoptosis can manifest cellular changes that might mimic DNA damage.

Purpose of the Study:

  • To investigate whether apoptotic cells can produce comet assay images.
  • To determine if these images can lead to misinterpretation of genotoxicity results.
  • To assess the reliability of the comet assay in the presence of apoptosis.

Main Methods:

  • Utilized Jurkat cells with low Fas antigen expression.
  • Induced apoptosis using an anti-Fas antibody.
  • Observed comet images formation during the early stages of apoptosis.

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  • Employed Yopro-1 staining as a complementary apoptosis detection method.

    • Main Results:

    • Apoptotic cells generated typical comet assay images early in the apoptosis process.
    • These images can potentially distort genotoxicity interpretations.
    • Yopro-1 staining, indicative of apoptosis, also appeared rapidly.

    Conclusions:

    • Comet assay results should not be solely interpreted as genotoxicity indicators when apoptosis is a possibility.
    • Apoptosis can create false positive genotoxicity signals.
    • Concurrent use of apoptosis markers, such as Yopro-1 staining, is recommended to validate comet assay findings.