Using the comet and micronucleus assays for genotoxicity studies: A review

Area of Science:

• Genotoxicity and Carcinogenesis
• Molecular Biology and Toxicology
• Regulatory Science

Background:

• Chemical, physical, and biological agents can induce DNA mutations, contributing to cancer development.
• Regulatory agencies mandate genotoxicity testing to assess potential cancer risks associated with various agents.
• The comet assay (CA) and micronucleus assay (MNA) are standard methods for evaluating DNA damage.

Purpose of the Study:

• To provide a comprehensive review of technical recommendations for the comet assay (CA) and micronucleus assay (MNA).
• To address the variability in published protocols for these widely used genotoxicity tests.
• This review is the first following the inclusion of the CA in S2R1 guidance and OECD 489.

Main Methods:

• Review of existing literature and guidelines on comet assay (CA) and micronucleus assay (MNA) protocols.
• Synthesis of main technical recommendations for both CA and MNA.
• Focus on practical aspects relevant to regulatory genotoxicity testing.

Main Results:

• Identified key technical recommendations for conducting CA and MNA.
• Highlighted areas of protocol variation and provided consensus-based guidance.
• Summarized essential parameters for reliable genotoxicity assessment using CA and MNA.

Conclusions:

• Standardized technical recommendations for CA and MNA are essential for consistent and reliable genotoxicity testing.
• This review offers valuable guidance for researchers and regulatory bodies utilizing these assays.
• Adherence to updated recommendations will improve the evaluation of DNA damage and cancer risk.