Spontaneous tumorigenesis in mice defective in the MTH1 gene encoding 8-oxo-dGTPase

Teruhisa Tsuzuki, Akinori Egashira, Hisato Igarashi, Tomoo Iwakuma, Yoko Nakatsuru, Yohei Tominaga, Hisaya Kawate, Kazuki Nakao, Kenji Nakamura, Fumio Ide, Shinobu Kura, Yusaku Nakabeppu, Motoya Katsuki, Takatoshi Ishikawa, Mutsuo Sekiguchi

Research output: Contribution to journalArticlepeer-review

264 Citations (Scopus)


Oxygen radicals, which can be produced through normal cellular metabolism, are thought to play an important role in mutagenesis and tumorigenesis. Among various classes of oxidative DNA damage, 8-oxo-7,8-dihydroguanine (8-oxoG) is most important because of its abundance and mutagenicity. The MTH1 gene encodes an enzyme that hydrolyzes 8-oxo-dGTP to monophosphate in the nucleotide pool, thereby preventing occurrence of transversion mutations. By means of gene targeting, we have established MTH1 gene-knockout cell lines and mice. When examined 18 months after birth, a greater number of tumors were formed in the lungs, livers, and stomachs of MTH1-deficient mice, as compared with wild-type mice. The MTH1-deficient mouse will provide a useful model for investigating the role of the MTH1 protein in normal conditions and under oxidative stress.

Original languageEnglish
Pages (from-to)11456-11461
Number of pages6
JournalProceedings of the National Academy of Sciences of the United States of America
Issue number20
Publication statusPublished - Sept 25 2001

All Science Journal Classification (ASJC) codes

  • General


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