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Chromosomal aberrations and in vitro radiosensitivity: intra-individual versus inter-individual variability
A Vral1, H Thierens, A Baeyens
1Department of Anatomy, Embryology, Histology and Medical Physics, University of Gent, L. Pasteurlaan 2, 9000 Gent, Belgium. anne.vral@ugent.be
Toxicology Letters
|April 20, 2004
Summary
The micronucleus (MN) and G2 assays show high variability, limiting their use for individual radiosensitivity testing. Repeat testing revealed similar inter- and intra-individual differences, suggesting caution when assessing cancer susceptibility.
Area of Science:
- Radiobiology
- Genetics
- Biomarker Research
Background:
- Micronucleus (MN) and G2 assays are potential biomarkers for in vitro radiosensitivity and cancer susceptibility.
- Assessing inter- and intra-individual variation is crucial for validating these biomarkers.
Purpose of the Study:
- To evaluate the applicability of MN and G2 assays as biomarkers of in vitro radiosensitivity and cancer susceptibility.
- To investigate the inter- and intra-individual variation of MN and G2 assay endpoints.
Main Methods:
- Blood cultures from 57 healthy donors were exposed to gamma-rays (3.5 Gy for MN assay, 0.4 Gy in G2 phase for G2 assay).
- Repeat samples from 14 donors were tested over 3 years to assess variability.
Main Results:
- Intra-individual variability was not significantly different from inter-individual variability for both MN and G2 assays.
- High intra-individual variability limits the detection of reproducible differences in radiation sensitivity within a normal population.
Conclusions:
- Care must be taken when using chromosomal aberration assays on single blood samples to assess individual radiosensitivity.
- Multiple blood samplings may be necessary for reliable conclusions; further validation is needed for individual use, but assays are valuable for population studies.