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We propose an improved earlier described "mirror" method for detecting in cell nuclear extracts mutations that arise in DNA during its replication due to the misincorporation of deoxyadenosine-5'-monophosphate (dAMP) opposite 7,8-dihydro-8-oxoguanine (8-oxoG). This method is based on the synthesis of a complementary chain ("mirror") by nuclear extracts of different mice organs on a template containing 8-oxoG and dideoxycytidine residue (ddC) at the 3'‑end. The "mirror" was amplified by PCR using primers part of which was non-complementary to the template. It allowed obtaining the "framed mirror" products. The misincorporation of dAMP in "framed mirror" products forms an EcoRI restriction site. The restriction analysis of double-stranded "framed mirror" products allows a quantification of the mutation frequency in nuclear extracts. The data obtained show that the mutagenic potential of 8-oxoG markedly varied in different organs of adult mice and embryos.

Estimation of the Mutagenic Potential of 8-Oxog in Nuclear Extracts of Mouse Cells Using the “Framed Mirror” Method