ArticleInternational journal of molecular sciences2026
A Comparative Study for the Incorporation of 8-oxo-dATP in DNA by Human DNA Polymerases.
Article in International journal of molecular sciences, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
In this work, we analyzed the ability to incorporate 8-oxo-dATP by several human DNA polymerases: replicative Pol ε (exo-) from Family B; base excision repair (BER) enzymes Pol β and Pol λ from Family X; and translesion Pol η, Pol ι, and Pol κ from Family Y. We demonstrated that human DNA polymerases differ in their abilities to discriminate against 8-oxo-dATP. Among the tested DNA polymerases, Pol λ exhibited the worst ability to discriminate against 8-oxo-dATP opposite template T on DNA substrates with a protruding single-stranded 5'-end and a double-stranded DNA with a 1 nt gap. Pol β and DNA polymerases of Family Y showed relatively high accuracy. Pol η demonstrated the most effective discrimination against 8-oxo-dATP on templates T and G. Pol ι exclusively incorporated 8-oxo-dATP opposite template G but not T. Unexpectedly, the catalytic subunit of high-fidelity Pol ε (exo-) incorporated 8-oxo-dATP opposite templates T and G with higher efficiency compared with the error-prone polymerases of Family Y and Pol β. While the structures of human polymerases with incoming 8-oxo-dATP are not available, we speculate on a possible mechanism of 8-oxo-dATP discrimination.
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