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This paper reviews several monitoring studies where the short-term HPRT assay has been applied. The original method uses autoradiography to detect 3H-thymidine incorporation in variant cells that have undergone DNA synthesis; the bromodeoxyuridine modification employs this thymidine analog and fluorescence plus Giemsa staining. The studies discussed here were accomplished with either of these methods. methods. Exposures analyzed include radiation and chemotherapy as medical treatments and accidental exposures to radiation; these studies have been useful in the validation of the assay because radiation and anticancer drugs are well-known mutagens. Other potential mutagens such as environmental arsenic and a parasitic infection and praziquantel, used for its treatment, have also been monitored for hprt locus mutation. An overview of the results obtained with different agents and routes of exposure is presented here as well as some methodological aspects for the optimization of the assay for monitoring studies.

The HPRT short-term assay in monitoring individuals exposed to genotoxic agents.