2000
DOI: 10.1073/pnas.050404497
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Mmh / Ogg1 gene inactivation results in accumulation of 8-hydroxyguanine in mice

Abstract: The major mutagenic base lesion in DNA caused by exposure to reactive oxygen species is 8-hydroxyguanine or 7,8-dihydro-8-oxoguanine (8-OH-G). Products of the human MMH͞OGG1 gene are known to catalyze in vitro the reactions repairing this DNA lesion. To analyze the function of Mmh in vivo, we generated a mouse line carrying a mutant Mmh allele by targeted gene disruption. Mmh homozygous mutant mice were found to have a physically normal appearance, but to have lost nicking activity in liver extracts for substr… Show more

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Cited by 331 publications
(233 citation statements)
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“…Similarly, a novel model of OGG1 deficiency also reported a significant increase in 8-oxoG lesions, associated with increased mutagenesis of a transgenic gpt gene [Minowa et al, 2000;Arai et al, 2002Arai et al, , 2003]. However, no increase in spontaneous tumors was detected in this strain of Ogg1 2/2 mice.…”
Section: Actions Of Ber Glycosylases In Disease States Obesity and Mementioning
confidence: 88%
See 1 more Smart Citation
“…Similarly, a novel model of OGG1 deficiency also reported a significant increase in 8-oxoG lesions, associated with increased mutagenesis of a transgenic gpt gene [Minowa et al, 2000;Arai et al, 2002Arai et al, , 2003]. However, no increase in spontaneous tumors was detected in this strain of Ogg1 2/2 mice.…”
Section: Actions Of Ber Glycosylases In Disease States Obesity and Mementioning
confidence: 88%
“…The primary substrates recognized by OGG1 include 8-oxoguanine (8-oxoG), the most commonly formed oxidative DNA lesion, and the formamidopyrimidine derivative of guanine (FapyG). Extracts from mice lacking OGG1 have consistently demonstrated increased accumulation of these lesions [Minowa et al, 2000;Nishimura, 2001;Hu et al, 2005]. However, as discussed below, the relationship between the increased number of lesions and pathological states is not always straightforward.…”
Section: Ogg1mentioning
confidence: 99%
“…The four DNA glycosylases each function in the suppression of mutations by 8-oxo-Gua in DNA. The overlapped recognition of 8-oxo-Gua could explain the fact that single knock-out mice deficient in OGG1, MUTYH, NTH1, and NEIL1 show few tumor phenotypes [57,[65][66][67][68][69][70][71]. In contrast, there is evidence to support the view that polymorphisms in these DNA glycosylases are associated with human carcinogenesis (reviewed in 72).…”
Section: Discussionmentioning
confidence: 99%
“…1 Also, these knockout mice do not have an increased rate of developing malignancy. 1,17 Additionally, although the number of cases is relatively small in this study, hOGG1 expression in follicular lymphoma did not correlate with disease stage at presentation, overall survival, or response to therapy (data not shown). Taken together, our findings suggest that downregulation of hOGG1 expression may be an early event in lymphomagenesis.…”
Section: Discussionmentioning
confidence: 61%