Abstract
Oxygen radicals are produced through normal cellular metabolism, and formation of such radicals is further enhanced by ionizing radiation and by various chemicals (3). The oxygen radicals attack nucleic acids and generate various modified bases in DNA (9, 16). Among them, 8-oxo-7,8-dihydroguanine (8-oxoG) is the most abundant, and appears to play critical roles in carcinogenesis and in aging (6, 22). 8-OxoG can pair with both cytosine and adenine during DNA synthesis, and as a result, G-C to T-A transversions are induced (28, 31). Oxidation of guanine also occurs in the cellular nucleotide pool. 8-Oxo-dGTP thus formed is a potent mutagenic substrate for DNA synthesis, since it can be incorporated opposite adenine as well as cytosine in DNA, at almost equal efficiencies (24). In this case, both types of transversions, A-T to C-G and G-C to T-A, would be induced (13).
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Sekiguchi, M., Hayakawa, H. (1998). Mammalian Enzymes for Preventing Mutations Caused by Oxidation of Guanine Nucleotides. In: Nickoloff, J.A., Hoekstra, M.F. (eds) DNA Damage and Repair. Contemporary Cancer Research. Humana Press, Totowa, NJ. https://doi.org/10.1007/978-1-59259-455-9_6
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DOI: https://doi.org/10.1007/978-1-59259-455-9_6
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