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Related Experiment Videos

Somatic cell mutations in atomic bomb survivors.

M Akiyama1, N Nakamura, M Hakoda

  • 1Department of Radiobiology, Radiation Effects Research Foundation, Hiroshima, Japan.

Journal of Radiation Research
|March 1, 1991
PubMed
Summary

Atomic bomb survivors show increased mutant frequencies in red blood cells and T-lymphocytes, correlating with radiation dose. Erythrocyte glycophorin A assays closely mirrored in vitro studies, while T-lymphocyte HPRT locus mutations showed a weaker dose response.

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Area of Science:

  • Radiation biology
  • Human genetics
  • Molecular toxicology

Background:

  • Assessing long-term health effects of radiation exposure is crucial.
  • Biomarkers of genetic damage can quantify radiation-induced mutations.

Purpose of the Study:

  • To measure mutant frequencies in atomic bomb survivors.
  • To correlate these frequencies with established radiation dose (DS86).
  • To compare in vivo mutation data with in vitro mutagenesis findings.

Main Methods:

  • Utilized four different assay systems to measure mutant frequencies.
  • Focused on peripheral blood lymphocytes and erythrocytes.
  • Employed erythrocyte glycophorin A assay and HPRT locus assay in T-lymphocytes.
  • Analyzed mutations at T-cell receptor genes and HLA-A genes.

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Main Results:

  • Erythrocyte glycophorin A assay showed a clear dose-related increase in mutant frequency.
  • Mutant T-lymphocyte frequency at the HPRT locus also increased with DS86 dose, but with a shallow slope.
  • No significant dose-related increase in mutation frequency was observed for T-cell receptor and HLA-A genes.

Conclusions:

  • Erythrocyte glycophorin A assay is a sensitive biomarker for in vivo radiation mutagenesis.
  • HPRT locus mutations in T-lymphocytes provide a weaker but detectable signal of radiation exposure.
  • Certain gene mutation assays may not be sensitive enough to detect radiation effects in survivor populations.