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Sequence Specificity of Aflatoxin B₁-induced Mutations in a Plasmid Replicated in Xeroderma Pigmentosum and DNA Repair Proficient Human Cells

Laboratory of Molecular Carcinogenesis [D. D. L., M. M. S., K. H. K.], National Cancer Institute, Bethesda, Maryland 20892; The Johns Hopkins University School of Hygiene and Public Health [J. D. G., S. E. L.], Baltimore, Maryland 21205; and Otsuka Pharmaceutical Company [M. M. S.], Rockville, Maryland 20850

The mutagenic spectrum induced by aflatoxin-DNA lesions in DNA repair deficient and repair proficient human cells was investigated. The reactive metabolite aflatoxin B₁-8,9-epoxide was synthesized and reacted in vitro with the shuttle vector plasmid pS189. Plasmids were transfected into human fibroblasts and allowed to replicate, and the recovered plasmids were screened in indicator bacteria for plasmid survival and mutations in the supF marker gene. Sequence data were obtained from 71 independently arising mutants recovered from DNA repair deficient xeroderma pigmentosum (XP) cells [XP12BE(SV40)] and 60 mutants recovered from a DNA repair proficient cell line (GM0637). Plasmid survival was lower and mutation frequency higher with the XP cells, and the mutation hotspots differed substantially for the 2 cell lines. Most mutations (>90%) were base substitutions at G:C pairs, only about one-half of which were G:CT:A transversions, the expected predominant mutation. One-third of the mutations at GG sites and none of those at isolated Gs were G:CA:T transitions. Tandem base substitutions also occurred only at GG sites and were found only with XP cells. The location of mutation hotspots with either cell line did not correlate with the level of modification within the sequence as assessed by a DNA polymerase stop assay. These results suggest that the DNA repair deficiency associated with XP can influence not only the overall frequency of mutations but also the distribution of mutations within a gene. The finding of transition mutations exclusively at GG sites may be of predictive value in attempts to link dietary aflatoxin exposure to cancers associated with specific mutations in the c-ras oncogene and the p53 tumor suppressor gene.

¹ To whom requests for reprints should be addressed.

Received 4/17/92. Accepted 7/29/92.

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