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Applicability of Scoring Calyculin A-Induced Premature Chromosome Condensation Objects for Dose Assessment Including
Mingzhu Sun1, Jayne Moquet1, David Lloyd1
1UK Health Security Agency (UKHSA), Department of Radiation Effects, Cytogenetics and Pathology Group, RCEHD, Didcot, UK.
Cytogenetic and Genome Research
|October 25, 2023
Summary
This study validates calyculin A-induced premature chromosome condensation (PCC) as a biodosimetry tool for radiation exposure. The assay accurately estimates doses below 2 Gy, crucial for emergency triage and mass casualty incidents.
Area of Science:
- Radiation Biology
- Cytogenetics
- Biophysics
Background:
- Previous research established a calibration curve for premature chromosome condensation (PCC) assay.
- The current study extends this to evaluate PCC for low-dose radiation assessment critical for triage.
Purpose of the Study:
- To assess the applicability of calyculin A-induced PCC assay for accurate dose estimation below 2 Gy.
- To evaluate the assay's performance in blind tests and clinical samples from radiotherapy patients.
Main Methods:
- Constructed a linear calibration curve for calyculin A-induced PCC using excess PCC objects.
- Conducted blind tests with known radiation doses and analyzed blood samples from cancer patients undergoing radiotherapy.
- Compared results with the dicentric chromosome assay (DCA).
Main Results:
- Dose estimates in blind tests were within 95% confidence limits for 4 out of 6 doses.
- Whole-body dose estimates for radiotherapy patients were comparable to DCA.
- Pre-RT patient samples showed higher dose estimates than healthy donors, but categorized them for low-dose exposure (<1 Gy).
Conclusions:
- Scoring excess objects using calyculin A-induced PCC is a viable biodosimetry tool for radiological emergencies, especially in mass casualty scenarios.
- The assay is effective for assessing both low- and high-dose exposures.
- Caution is advised when interpreting results from cancer patients.
