DNA repair enzyme that incises DNA at 8-oxoG residues. Excises 7,8-dihydro-8-oxoguanine and 2,6-diamino-4-hydroxy-5-N-methylformamidopyrimidine (FAPY) from damaged DNA. Has a beta-lyase activity that nicks DNA 3' to the lesion. Efficiently incises DNA duplexes containing 8-hydroxyguanine (8-OH-Gua), 8-hydroxyadenine (8-OH-Ade) and abasic (AP) sites placed opposite to a cytosine. 2'-deoxyribonucleotide-(2'-deoxyribose 5'-phosphate)-2'-deoxyribonucleotide-DNA = a 3'-end 2'-deoxyribonucleotide-(2,3-dehydro-2,3-deoxyribose 5'-phosphate)-DNA + a 5'-end 5'-monophospho-2'-deoxyribonucleoside-DNA + H(+) Nuclear and cytoplasmic in nurse cells and oocyte. Expressed in the cytoplasm of the nurse cells from oogenesis stage 3 and in the oocyte cytoplasm from stage 10B onwards. Expressed uniformly in third larval instar wing imaginal disk. Expressed maternally and zygotically in the larvae. Belongs to the type-1 OGG1 family.