Mutation spectrum of heat-induced abasic sites on a single-stranded shuttle vector replicated in mammalian cells - PubMed (original) (raw)
. 1992 Sep 25;267(27):19718-23.
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- PMID: 1527092
Free article
Mutation spectrum of heat-induced abasic sites on a single-stranded shuttle vector replicated in mammalian cells
J B Neto et al. J Biol Chem. 1992.
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Abstract
The mutational potency of apurinic/apyrimidinic (AP) sites induced by heat-treatment under acidic conditions has been studied in mammalian cells. Abasic sites were induced on a single-stranded DNA shuttle vector carrying the supF tRNA gene, eliminating, therefore, any ambiguity concerning the damaged strand. This vector was able to replicate both in mammalian cells and in bacteria where the mutations induced in animal cells on the supF tRNA gene were screened by the white/blue beta-galactosidase assay in the presence of isopropyl-1-thio-beta-D-galactopyranoside and 5-bromo-4-chloro-3-indoyl-beta-D-galactoside. All white colonies contained plasmid with a mutation on the target gene which was directly sequenced. Our results show that one AP site was induced/22 min of heating as measured by sensitivity of DNA to alkali denaturation or treatment with the AP-endonuclease activity of the FPG protein (Fapy-DNA glycosylase). Putative AP sites decrease survival of the plasmid with a lethal hit of one AP site/single-stranded molecule. Mutation frequency was increased by a factor of approximately six after 2 h at 70 degrees C. Most of the induced mutations were point mutations not distributed at random and clustered in the gene region which will give rise to the mature tRNA. Mutations were abolished by treatments that eliminated AP sites such as alkali treatment or incubation with the Fapy-DNA glycosylase protein. Under our experimental conditions, when only single mutations were taken into account, the order of base insertion opposite AP sites was G greater than A greater than T greater than C.
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