Abstract
A simple technique for the detection of DNA-modifying agents is described. The double-stranded covalently closed circular DNA of phage PM2 is exposed to the modifying agent and then analysed for DNA damages by assays involving only incubation steps and filtration through nitrocellulose filters. The technique described allows the measurement of DNA modifications which lead to local denaturation of the DNA double helix, interstrand cross-links, single- and double-strand breaks, damages which render the phosphodiester bonds of the DNA sensitive to hydrolysis and damages which labilise the glycosylic bond between base and sugar moiety.
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