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Updated: Mar 25, 2026
Comprehensive Assessment of Germline Chemical Toxicity Using the Nematode Caenorhabditis elegans
Published on: February 22, 2015
DNA Strand Breaks in Mitotic Germ Cells of Caenorhabditis elegans Evaluated by Comet Assay
Sojin Park1, Seoyun Choi1, Byungchan Ahn1
1Department of Life Sciences, University of Ulsan, Ulsan 44610, Korea.
Abstract:
DNA damage responses are important for the maintenance of genome stability and the survival of organisms. Such responses are activated in the presence of DNA damage and lead to cell cycle arrest, apoptosis, and DNA repair. In Caenorhabditis elegans, double-strand breaks induced by DNA damaging agents have been detected indirectly by antibodies against DSB recognizing proteins. In this study we used a comet assay to detect DNA strand breaks and to measure the elimination of DNA strand breaks in mitotic germline nuclei of C. elegans. We found that C. elegans brc-1 mutants were more sensitive to ionizing radiation and camptothecin than the N2 wild-type strain and repaired DNA strand breaks less efficiently than N2. This study is the first demonstration of direct measurement of DNA strand breaks in mitotic germline nuclei of C. elegans. This newly developed assay can be applied to detect DNA strand breaks in different C. elegans mutants that are sensitive to DNA damaging agents.
Insights
The study shows that C. elegans brc-1 mutants are less efficient at repairing DNA strand breaks after radiation exposure compared to wild-type worms. This research introduces a new method for directly measuring DNA breaks in C. elegans germline cells.
Area of Science:
- Genetics
- Molecular Biology
- Cell Biology
Background:
- DNA damage responses are crucial for genome stability and organism survival.
- Existing methods for detecting DNA double-strand breaks in C. elegans are indirect.
- The brc-1 gene is implicated in DNA repair pathways.
Purpose of the Study:
- To directly measure DNA strand breaks in mitotic germline nuclei of C. elegans.
- To assess the DNA repair efficiency of C. elegans brc-1 mutants.
- To establish a new assay for studying DNA damage in C. elegans.
Main Methods:
- Utilized the comet assay to detect and quantify DNA strand breaks.
- Exposed wild-type (N2) and brc-1 mutant C. elegans to ionizing radiation and camptothecin.
- Measured the elimination rate of DNA strand breaks in mitotic germline nuclei.
Main Results:
- C. elegans brc-1 mutants exhibited increased sensitivity to ionizing radiation and camptothecin.
- brc-1 mutants demonstrated less efficient repair of DNA strand breaks compared to N2.
- This study provides the first direct measurement of DNA strand breaks in C. elegans mitotic germline nuclei.
Conclusions:
- The comet assay is effective for direct measurement of DNA strand breaks in C. elegans germline.
- brc-1 plays a significant role in DNA strand break repair in C. elegans.
- The developed assay can be applied to various C. elegans mutants sensitive to DNA damaging agents.
