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. 2004 Jul 1;64(13):4411-4.
doi: 10.1158/0008-5472.CAN-04-0355.

Accumulation of the oxidative base lesion 8-hydroxyguanine in DNA of tumor-prone mice defective in both the Myh and Ogg1 DNA glycosylases

Maria Teresa Russo  1 , Gabriele De Luca, Paolo Degan, Eleonora Parlanti, Eugenia Dogliotti, Deborah E Barnes, Tomas Lindahl, Hanjing Yang, Jeffrey H Miller, Margherita Bignami
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Accumulation of the oxidative base lesion 8-hydroxyguanine in DNA of tumor-prone mice defective in both the Myh and Ogg1 DNA glycosylases

Maria Teresa Russo et al. Cancer Res. .

Abstract

The OGG1 and MYH DNA glycosylases prevent the accumulation of DNA 8-hydroxyguanine. In Myh(-/-) mice, there was no time-dependent accumulation of DNA 8-hydroxyguanine in brain, small intestine, lung, spleen, or kidney. Liver was an exception to this general pattern. Inactivation of both MYH and OGG1 caused an age-associated accumulation of DNA 8-hydroxyguanine in lung and small intestine. The effects of abrogated OGG1 and MYH on hepatic DNA 8-hydroxyguanine levels were additive. Because there is an increased incidence of lung and small intestine cancer in Myh(-/-)/Ogg1(-/-) mice, these findings support a causal role for unrepaired oxidized DNA bases in cancer development.

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