The micronucleus assay in radiation accidents

Area of Science:

• Radiation biology
• Biomonitoring
• Cytogenetics

Background:

• The cytokinesis-block micronucleus assay is a standardized method for biological dosimetry.
• Automated scoring of micronuclei offers potential for large-scale applications, such as population triage after radiation incidents.
• Current dose detection limits are 0.2 Gy, but can be improved to 0.1 Gy using fluorescence in situ hybridization (FISH) for centromere detection.

Purpose of the Study:

• To evaluate the utility of the micronucleus assay in biodosimetry.
• To assess the impact of automated scoring and FISH on dose detection limits.
• To review past applications and future challenges of the micronucleus assay.

Main Methods:

• Cytokinesis-block micronucleus assay in peripheral blood lymphocytes.
• Automated scoring of micronuclei.
• Fluorescence in situ hybridization (FISH) for centromere detection.
• Comparison with dicentric and translocation scoring in a case study.

Main Results:

• The micronucleus assay is a validated biodosimetry technique.
• Automated scoring enables large-scale applications.
• FISH improves dose detection limit to 0.1 Gy.
• The assay showed good agreement with other methods in a real-world radiation exposure case.

Conclusions:

• The micronucleus assay, particularly with automated scoring and FISH, is a powerful tool for biodosimetry.
• Its application in population triage and individual dose assessment is significant.
• Further development is needed to fully realize systematic biodosimetry of exposed populations.