Abstract
A polymerase arrest assay was designed to determine sites of adduction in the human p53 gene induced by incubation with fecal water. Significant formation of adducts was observed on p53 DNA after a 2-h incubation in fecal water from 10 of 17 samples studied. Large sample-to-sample variation was observed. The major sites of polymerase termination occurred at nucleotides 3' to guanine residues. Adduct sites coincided with colorectal cancer p53 mutation "hotspots," highlighting the potential carcinogenicity of fecal material.
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