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A High-Throughput Comet Assay Approach for Assessing Cellular DNA Damage
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The enzyme-modified comet assay: Past, present and future.

Damián Muruzabal1, Andrew Collins2, Amaya Azqueta3

  • 1Universidad de Navarra, Department of Pharmacology and Toxicology, Faculty of Pharmacy and Nutrition, Irunlarrea 1, 310008, Pamplona, Spain.

Food and Chemical Toxicology : an International Journal Published for the British Industrial Biological Research Association
|November 20, 2020
PubMed
Summary

The enzyme-modified comet assay detects a wider range of DNA damage, including oxidized and alkylated bases, using specific DNA repair enzymes. This advanced technique enhances genotoxicity testing and mechanistic studies for various toxins.

Keywords:
AP-SitesAlkaline comet assayAlkylated lesionsCyclobutane pyrimidine dimersOxidized lesionsUracil mis-incorporation

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Area of Science:

  • Molecular Biology
  • Genotoxicology
  • Biochemistry

Background:

  • The standard comet assay detects DNA strand breaks and alkali-labile sites.
  • A need exists for methods detecting a broader spectrum of DNA lesions.

Purpose of the Study:

  • To describe the enzyme-modified comet assay for detecting diverse DNA lesions.
  • To review enzymes used and their applications in genotoxicity studies.

Main Methods:

  • Combining lesion-specific DNA repair enzymes with the comet assay.
  • Utilizing enzymes like formamidopyrimidine DNA glycosylase (Fpg) and endonuclease III (EndoIII).

Main Results:

  • The assay detects oxidized/alkylated bases, pyrimidine dimers, uracil incorporation, and abasic sites.
  • Twelve enzymes have been employed, with Fpg and EndoIII being most common.

Conclusions:

  • Enzyme-modified comet assay expands DNA damage detection capabilities.
  • It is valuable for biomonitoring, toxicology, genotoxicity testing, and mechanistic research.
  • Further enzyme incorporation can enhance its utility in regulatory contexts.