Cellular and chromosomal hypersensitivity to DNA crosslinking agents and topoisomerase inhibitors in the radiosensitive Chinese hamster irs mutants: phenotypic similarities to ataxia telangiectasia and Fanconi's anaemia cells.

Abstract excerpt

The mutants irs1, irs2 and irs3 were previously isolated from the Chinese hamster line V79-4 on the basis of their hypersensitivity (2-3-fold) to cell inactivation by X-rays. Here the cross-sensitivities of the irs mutants to an array of chemical mutagens and topoisomerase inhibitors was determined in a differential cytotoxicity assay. Irs2 showed moderate hypersensitivity (2-3-fold) to simple alkylating agents...

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