8-Oxoguanine
 | |
| Names | |
|---|---|
| IUPAC name
2-Amino-7,9-dihydro-1H-purine-6,8-dione | |
| Other names
7,8-Dihydro-8-oxoguanine; 8-Oxo-7,8-dihydroguanine | |
| Identifiers | |
5614-64-2  | |
| 3D model (Jmol) | Interactive image Interactive image |
| ChEBI | CHEBI:44605 |
| ChemSpider | 106574 |
| ECHA InfoCard | 100.024.578 |
| MeSH | 8-hydroxyguanine |
| PubChem | 119315 |
| |
| |
| Properties | |
| C5H5N5O2 | |
| Molar mass | 167.13 g·mol−1 |
| Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). | |
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| Infobox references | |
8-Oxoguanine (8-hydroxyguanine, 8-oxo-Gua, or OH8Gua) is one of the most common DNA lesions resulting from reactive oxygen species [2] and can result in a mismatched pairing with adenine resulting in G to T and C to A substitutions in the genome.[3] In humans, it is primarily repaired by DNA glycosylase OGG1. It can be caused by ionizing radiation, in connection with oxidative metabolism.
8-oxoG (syn) in a Hoogsteen base pair with dA (anti)
For comparison here is a standard (non-mutagenic) GC base pair with both bases in the anti configuration of the bond between base and sugar.
In body fluids
Increased concentrations of 8-oxoguanine in body fluids have been found to be associated with increased risk of mutagenesis and carcinogenesis.[4][5]
Care must be taken in the assay of 8-oxoguanine due to the ease with which it can be oxidised during extraction and the assay procedure.[6]
See also
References
- ↑ 8-hydroxyguanine - Compound Summary, PubChem
- ↑ Kanvah, S.; et al. (2010). ", Oxidation of DNA: Damage to Nucleobases". Acc. Chem. Res. 43 (2): 280–287. doi:10.1021/ar900175a.
- ↑ Cheng KC; Cahill DS; Kasai H; Nishimura S; Loeb LA (Jan 5, 1992). "8-Hydroxyguanine, an abundant form of oxidative DNA damage, causes G→T and C→A substitutions.". J Biol Chem. 267 (1): 166–72. PMID 1730583.
- ↑ Kasai, H (December 1997). "Analysis of a form of oxidative DNA damage, 8-hydroxy-2'-deoxyguanosine, as a marker of cellular oxidative stress during carcinogenesis.". Mutation research. 387 (3): 147–63. doi:10.1016/s1383-5742(97)00035-5. PMID 9439711.
- ↑ Halliwell, B (December 1998). "Can oxidative DNA damage be used as a biomarker of cancer risk in humans? Problems, resolutions and preliminary results from nutritional supplementation studies.". Free Radical Research. 29 (6): 469–86. doi:10.1080/10715769800300531. PMID 10098453.
- ↑ Ravanat, JL; Douki, T; Duez, P; Gremaud, E; Herbert, K; Hofer, T; Lasserre, L; Saint-Pierre, C; Favier, A; Cadet, J (November 2002). "Cellular background level of 8-oxo-7,8-dihydro-2'-deoxyguanosine: an isotope based method to evaluate artefactual oxidation of DNA during its extraction and subsequent work-up". Carcinogenesis. 23 (11): 1911–8. doi:10.1093/carcin/23.11.1911. PMID 12419840.
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