The measurement of oxidative damage to DNA by HPLC and GC/MS techniques.

Oxidative damage to DNA has been measured by quantitating 8-hydroxy-2'-deoxyguanosine (8-OHdGuo) after enzymic digestion of DNA, followed by HPLC separation and electrochemical detection. Alternatively, 8-hydroxyguanine (and a wide range of other base-derived products of free radical attack) may be measured after acidic hydrolysis of DNA or chromatin, followed by derivatization and gas-chromatography/mass spectrometry. Both techniques have comparable sensitivity, but GC/MS enables determination of a wide variety of chemical changes to all four DNA bases and it can be applied to DNA-protein complexes. However, the two techniques do not always give similar results. Potential reasons for this are discussed. Greater attention to methodological questions is required before using measurement of 8-OHdGuo as a "routine" marker of oxidative DNA damage in vivo.

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