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Normal human or xeroderma pigmentosum complementation group A (XP-A) fibroblasts were exposed to various concentrations of either 4-nitroquinoline 1-oxide (4NQO) or its 3-methyl derivative, and the rates of repair of the alkali-labile lesions induced in DNA by each agent were monitored over a period of 24 h post-treatment incubation. The data indicate that 4NQO induces at least two major classes of alkali-labile lesions into human DNA; one class disappears rapidly from the DNA of both normal and XP-A fibroblasts, while the other class undergoes repair at a relatively slow rate in normal cells, but is not removed at all in the excision-deficient cells. Methylation of 4NQO at the 3-position appears to abolish the induction of the latter class of alkali-labile lesions, whereas the rapidly removed lesions are still being induced.
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