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The comet assay: genotoxic damage or nuclear fragmentation?

Mark S Rundell1, Elizabeth D Wagner, Michael J Plewa

  • 1Department of Crop Sciences, University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA.

Environmental and Molecular Mutagenesis
|August 21, 2003
PubMed
Summary

The comet assay accurately detects mutagen-induced DNA damage, not apoptosis. DNA strand breaks from genotoxic agents are repairable, and cells are not lost during recovery, confirming assay validity for genotoxicity testing.

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Area of Science:

  • Genotoxicology
  • Molecular Biology
  • Cellular Biology

Background:

  • The single cell gel electrophoresis (SCGE) or comet assay is widely used to detect DNA damage.
  • A key criticism questions whether observed comet images result from genotoxic damage or apoptosis-mediated nuclear fragmentation.

Purpose of the Study:

  • To investigate if mutagen-induced DNA damage detected by the SCGE assay is repairable or due to nonrepairable nuclear fragmentation.
  • To differentiate between DNA strand breaks from genotoxicity and those from apoptosis.

Main Methods:

  • Chinese hamster ovary cells were treated with ethylmethanesulfonate, 2-acetoxyacetylaminofluorene, or H(2)O(2).
  • Cells were analyzed immediately or after liquid holding recovery for DNA repair.
  • Nuclei images were captured before and after electrophoresis to track potential loss.

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Main Results:

  • A significant decrease in tail moments was observed after liquid holding, indicating DNA repair.
  • No nuclei were lost during the recovery period due to apoptotic fragmentation or DNA migration.
  • Even severely damaged 'hedgehog' comet images remained detectable after liquid holding.

Conclusions:

  • Mutagen-induced DNA damage, not apoptotic fragmentation, is the primary cause of observed comet assay results.
  • The comet assay reliably measures repairable genotoxic DNA damage.
  • The assay's validity is supported by the absence of artifactual nuclei loss during recovery.