Involved in repair of DNA damaged by oxidation by incising 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. 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(+) Expressed in stems, roots, rosette and cauline leaves, flowers and seeds. Expression is induced during seed desiccation and imbibition. No visible phenotype under normal growth conditions or UV-A irradiation stress. Transgenic seeds over-expressing OGG1 exhibit enhanced seed longevity associated with reduced DNA damage, enhanced seed tolerance to abiotic stresses and improved germination performance under abiotic stresses. Belongs to the type-1 OGG1 family.