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Division of Neurofunctional Genomics, Medical Institute of Bioregulation, Kyushu University and CREST, JST, Fukuoka 812-8582 [K. S., Y. T., M. F., P. X., Y. N.]; Department of Medical Biophysics and Radiation Biology, Graduate School of Medical Science, Kyushu University, Fukuoka 812-8582 [T. T.]; and Biomolecular Engineering Research Institute, Suita 565-0874 [M. S.], Japan
Using Mth1 and Ogg1 knockout mice, we evaluated the roles of these enzymes to prevent tumorigenesis and the accumulation of 8-oxoguanine (8-oxoG) in DNA. We found that lung adenoma/carcinoma spontaneously developed in Ogg1 knockout mice
1.5 years after birth in which 8-oxoG was found to accumulate in their genomes. The mean number of tumors/mouse was 0.71 for the Ogg1 knockout mice, which was five times higher than that observed in wild-type mice (0.14). Although the accumulation of 8-oxoG was also confirmed in the Ogg1, Mth1 double knockout mice, we found no tumor in the lungs of these mice. This observation suggests that Mth1 gene disruption resulted in a suppression of the tumorigenesis caused by an Ogg1 deficiency.
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