Synergistic Actions of Ogg1 and Mutyh DNA Glycosylases Modulate Anxiety-like Behavior in Mice

• Ogg1−/−Mutyh−/− mice show increased activity, decreased anxiety, and impaired learning
• No apparent accumulation of 8-oxoG was found in mutant mouse brains compared to WT brains
• Differentially expressed genes in Ogg1−/−Mutyh−/− brains are important for anxiety

SummaryOgg1 and Mutyh DNA glycosylases cooperate to prevent mutations caused by 8-oxoG, a major premutagenic DNA lesion associated with cognitive decline. We have examined behavior and cognitive function in mice deficient of these glycosylases. Ogg1−/−Mutyh−/− mice were more active and less anxious, with impaired learning ability. In contrast, Mutyh−/− mice showed moderately improved memory. We observed no apparent change in genomic 8-oxoG levels, suggesting that Ogg1 and Mutyh play minor roles in global repair in adult brain. Notably, transcriptome analysis of hippocampus revealed that differentially expressed genes in the mutants belong to pathways known to be involved in anxiety and cognition. Esr1 targets were upregulated, suggesting a role of Ogg1 and Mutyh in repression of Esr1 signaling. Thus, beyond their involvement in DNA repair, Ogg1 and Mutyh regulate hippocampal gene expression related to cognition and behavior, suggesting a role for the glycosylases in regulating adaptive behavior.

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