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Updated: Aug 8, 2026
Cell Cycle-specific Measurement of γH2AX and Apoptosis After Genotoxic Stress by Flow Cytometry
Published on: September 1, 2019
Dynamic analysis of DNA damage by flow cytometry and FISH
1Department of Environmental and Natural Resources Management, Ioannina University, Seferi 2, Agrinio 30100, Greece. dmatthop@cc.uoi.gr
Abstract:
The micronucleus assay, developed to assess DNA damage induced by noxious agents, supplies information on whether the damage is due to clastogenic or aneugenic action. Although it is the test that can be used to assess agents' toxicity, it cannot provide information on the molecular events that result in the induction of micronuclei. To study the molecular events, the combination of both microscopic and analytical techniques is required. Flow-sorting induced micronuclei, based on their DNA content, in combination with chromosomal FISH and other molecular techniques, may provide information on these events.
Insights
The micronucleus assay detects DNA damage from toxic agents. Combining it with advanced techniques like flow-sorting and FISH can reveal the molecular events causing micronuclei formation.
Area of Science:
- Genotoxicology
- Molecular Biology
- Cellular Biology
Background:
- The micronucleus assay is a standard method for evaluating DNA damage caused by toxic substances.
- It differentiates between clastogenic (chromosome breakage) and aneugenic (chromosome loss) damage.
- However, it lacks detail on the specific molecular mechanisms leading to micronuclei.
Purpose of the Study:
- To explore methods for elucidating the molecular events underlying micronucleus induction.
- To enhance the analytical capabilities of the micronucleus assay.
Main Methods:
- Utilizing flow-sorting to isolate micronuclei based on DNA content.
- Integrating chromosomal Fluorescence In Situ Hybridization (FISH) with other molecular techniques.
- Combining microscopic and analytical approaches.
Main Results:
- Flow-sorting allows for the separation of micronuclei by DNA quantity.
- FISH and molecular analyses can provide insights into the chromosomal content of sorted micronuclei.
- This integrated approach offers a deeper understanding of genotoxic mechanisms.
Conclusions:
- The combination of flow-sorting, FISH, and molecular techniques significantly expands the information obtained from the micronucleus assay.
- These advanced methods are crucial for detailed investigation of molecular events in genotoxicity testing.
- This approach aids in understanding the precise pathways of DNA damage and repair.
