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Abstract
An assay system has been developed for measuring the fidelity of DNA synthesis in vitro by using synthetic polynucleotide templates and purified DNA polymerases. Nearest-neighbor analysis of the synthesized product indicates that noncomplementary nucleotides are incorporated as single base substitutions. The accuracy of DNA synthesis can be decreased by (1) prior alkylation of the template, (2) increasing the relative concentration of incorrect nucleotides, and (3) addition of specific metal salts to the reaction mixture. As an initial evaluation of the utility of this system, the effects of 31 metal salts on the fidelity of DNA synthesis have been determined. The results indicate that potential metal mutagens and/or carcinogens may be detected by measuring alterations in the fidelity of DNA synthesis.
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