Cited by 2,892Carcinogens and Genotoxicity AssessmentDNA Repair MechanismsEffects of Radiation Exposure

The DOI matches its Crossref record; 46 of the 46 references it cites were found in a registry or an index.

The Comet Assay for DNA Damage and Repair: Principles, Applications, and Limitations

Collins, Andrew R.·2004·Molecular Biotechnology

Abstract

The comet assay (single-cell gel electrophoresis) is a simple method for measuring deoxyribonucleic acid (DNA) strand breaks in eukaryotic cells. Cells embedded in agarose on a microscope slide are lysed with detergent and high salt to form nucleoids containing supercoiled loops of DNA linked to the nuclear matrix. Electrophoresis at high pH results in structures resembling comets, observed by fluorescence microscopy; the intensity of the comet tail relative to the head reflects the number of DNA breaks. The likely basis for this is that loops containing a break lose their supercoiling and become free to extend toward the anode. The assay has applications in testing novel chemicals for genotoxicity, monitoring environmental contamination with genotoxins, human biomonitoring and molecular epidemiology, and fundamental research in DNA damage and repair. The sensitivity and specificity of the assay are greatly enhanced if the nucleoids are incubated with bacterial repair endonucleases that recognize specific kinds of damage in the DNA and convert lesions to DNA breaks, increasing the amount of DNA in the comet tail. DNA repair can be monitored by incubating cells after treatment with damaging agent and measuring the damage remaining at intervals. Alternatively, the repair activity in a cell extract can be measured by incubating it with nucleoids containing specific damage.

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  1. [36]36. Novotná, B. (2000) Increased DNA fragmentation detected by comet assay in peripheral blood of heterozygotes for a frameshift mutation in the DNA repair protein nibrin. DNA Repair Workshop Smolenice, Slovakia, October 2000, Abstract p. 33.

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Metadata

Authors
Collins, A. R.
Affiliations
University of Oslo (NO)
Corresponding author
Collins, Andrew R.
Venue
Molecular Biotechnology
Published
2004
Volume
26
Issue
3
Pages
249-261
ISSN
1073-6085 (ISSN-L)
OpenAlex
W2034485370
Cited by
2,892
References
46
Citations by year
2026: 91 · 2025: 104 · 2024: 119 · 2023: 134 · 2022: 138 · 2021: 157 · 2020: 146 · 2019: 168 · 2018: 164 · 2017: 174 · 2016: 161 · 2015: 179 · 2014: 156 · 2013: 162 · 2012: 171
FWCI
27.05
Type
journal article
Language
en
Open access
closed
Locations
  • Molecular Biotechnology (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cancer Research › Carcinogens and Genotoxicity Assessment
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › DNA Repair Mechanisms
  • Health Sciences › Medicine › Radiology, Nuclear Medicine and Imaging › Effects of Radiation Exposure
Keywords
comet assay, DNA strand breaks, DNA damage, DNA repair, genotoxicity testing, genotoxins, human biomonitoring, molecular epidemiology, DNA supercoiling
MeSH terms
Animals, DNA, DNA Damage, DNA Mutational Analysis, DNA Repair, Environmental Monitoring, Environmental Pollutants, Humans, Mutagens, Apoptosis, Molecular Epidemiology, Comet Assay

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