| Health / Medical Topics |
8-Oxoguanine DNA Glycosylase
The protein 8-Oxoguanine DNA Glycosylase, encoded by the OGG1 gene, is an enzyme in base excision repair. OGG1 incises DNA at 8-oxoguanine residues and excises 7,8-dihydro-8-oxoguanine and 2,6-diamino-4-hydroxy-5-n-methylformamidopyrimidine (FAPY) from damaged DNA. OGG1 also has activities of beta-lyase that nicks DNA 3-prime to the lesion and endonuclease that cleaves DNA near apurinic or apyrimidinic sites to products with 5-prime-phosphate. Alternative splicing of the C-terminal region of the OGG1 gene classifies splice variants into two major groups, type 1 and type 2, depending on the last exon of the sequence. Type 1 variants end with exon 7 and type 2 end with exon 8. All variants share the N-terminal region in common (1a/alpha, 1b, 1c, 2a/beta, 2b, 2c, 2d and 2e) and 1a is the prevalent form. OGG1 is ubiquitous and located in nucleus (isoform 1a) and mitochondria (isoform 2a). Defects in OGG1 are associated with tumor formation. (NCI Thesaurus)
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