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Reading and Misreading 8-oxoguanine, a Paradigmatic Ambiguous Nucleobase

Novosibirsk State University, 1 Pirogova St., 630090 Novosibirsk, Russia
SB RAS Institute of Chemical Biology and Fundamental Medicine, 8 Lavrentieva Ave., 630090 Novosibirsk, Russia
RAS Institute of Molecular Genetics, 2 Kurchatova Sq., 123182 Moscow, Russia
Podalirius Ltd., 77 Sacco and Vanzetti St, 630008 Novosibirsk, Russia
Authors to whom correspondence should be addressed.
These authors contributed equally to this work.
Crystals 2019, 9(5), 269;
Received: 26 April 2019 / Revised: 17 May 2019 / Accepted: 19 May 2019 / Published: 23 May 2019
(This article belongs to the Special Issue Noncanonical Nucleobases)
PDF [3216 KB, uploaded 28 May 2019]


7,8-Dihydro-8-oxoguanine (oxoG) is the most abundant oxidative DNA lesion with dual coding properties. It forms both Watson–Crick (anti)oxoG:(anti)C and Hoogsteen (syn)oxoG:(anti)A base pairs without a significant distortion of a B-DNA helix. DNA polymerases bypass oxoG but the accuracy of nucleotide incorporation opposite the lesion varies depending on the polymerase-specific interactions with the templating oxoG and incoming nucleotides. High-fidelity replicative DNA polymerases read oxoG as a cognate base for A while treating oxoG:C as a mismatch. The mutagenic effects of oxoG in the cell are alleviated by specific systems for DNA repair and nucleotide pool sanitization, preventing mutagenesis from both direct DNA oxidation and oxodGMP incorporation. DNA translesion synthesis could provide an additional protective mechanism against oxoG mutagenesis in cells. Several human DNA polymerases of the X- and Y-families efficiently and accurately incorporate nucleotides opposite oxoG. In this review, we address the mutagenic potential of oxoG in cells and discuss the structural basis for oxoG bypass by different DNA polymerases and the mechanisms of the recognition of oxoG by DNA glycosylases and dNTP hydrolases. View Full-Text
Keywords: 7,8-Dihydro-8-oxoguanine; mutagenesis; DNA polymerases; base excision repair; DNA glycosylases; nucleotide hydrolases; translesion DNA synthesis 7,8-Dihydro-8-oxoguanine; mutagenesis; DNA polymerases; base excision repair; DNA glycosylases; nucleotide hydrolases; translesion DNA synthesis

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Yudkina, A.V.; Shilkin, E.S.; Endutkin, A.V.; Makarova, A.V.; Zharkov, D.O. Reading and Misreading 8-oxoguanine, a Paradigmatic Ambiguous Nucleobase. Crystals 2019, 9, 269.

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