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Application of the Comet Assay in Advanced In Vitro Models.

Elise Rundén-Pran1, Naouale El Yamani1, Sivakumar Murugadoss1

  • 1Health Effects Laboratory, Department of Environmental Chemistry and Health Effects, The Climate and Environmental Research Institute NILU, Kjeller, Norway.

Methods in Molecular Biology (Clifton, N.J.)
|November 22, 2025
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Summary
This summary is machine-generated.

The comet assay effectively measures DNA damage in advanced cell models, supporting New Approach Methodologies (NAMs) for chemical safety assessment. This method aids in reducing animal testing for genotoxicity screening.

Keywords:
3D culturesComet assayDNA damageDNA oxidationGenotoxicityNew advanced modelsNew approach methods (NAMs)

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Area of Science:

  • Toxicology and Ecotoxicology
  • Molecular Biology
  • Genetics

Background:

  • The comet assay (single-cell gel electrophoresis) is a validated method for DNA damage assessment.
  • There is a growing need for non-animal testing methods in chemical risk assessment, aligning with the 3Rs principles.
  • Advanced cell models, including 3D cultures and co-cultures, offer more biologically relevant systems for toxicity testing.

Purpose of the Study:

  • To demonstrate the applicability of the comet assay in various advanced in vitro cell models.
  • To describe both standard alkaline comet assay (ACA) and enzyme-linked comet assay (ELCA) for detecting different types of DNA damage.
  • To provide guidance on experimental design and critical considerations for genotoxicity testing using these advanced models.

Main Methods:

  • Adaptation of the comet assay to advanced in vitro models (3D cultures, co-cultures, air-liquid interface).
  • Application of standard alkaline comet assay (ACA) for DNA strand breaks and enzyme-linked comet assay (ELCA) for base alterations using lesion-specific endonucleases.
  • Inclusion of methodological considerations, experimental design, and cytotoxicity testing.

Main Results:

  • The comet assay is applicable to advanced models from liver, lung, breast, gut, skin, and brain.
  • Both ACA and ELCA modifications are effective in detecting DNA damage in these complex models.
  • Protocols for standard 2-gel and 12-gel slide formats are provided, addressing critical assessment points.

Conclusions:

  • The comet assay's adaptation to advanced cell models represents a significant advancement in genotoxicity testing.
  • These advanced models provide more biologically relevant contexts for DNA damage and repair assessment.
  • This approach supports Next Generation Risk Assessment (NGRA) for developing safer chemicals and informing policy.