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Oxidative stress has been implicated in the etiology of many pathological states and known to result in
DNA
damage. Oxidative DNA damage can lead to mutagenesis (
1
–
3
) and has been associated with aging (
4
), diabetes mellitus (
5
), inflammatory disease (
1
) and carcinogenesis (
1
–
3
,
6
). The 8-hydroxy-2-deoxyguanosine lesion (8-OHdG) is often used in the assessment of oxidative DNA damage and has become the de facto marker for oxidative damage to DNA. 8-OHdG is one of the most prominent lesions observed following exposure to ionizing radiation (
7
) but also results from treatment with many xenobiotics (
8
) as well as by endogenous mechanisms. Thus, normal endogenous levels becomes a critical issue in the assessment of cellular 8-OHdG levels in pathological states. Furthermore, 8-OHdG is efficiently repaired by a DNA glycosylase specific for this lesion (
9
) and its contribution to mutagenesis is relatively weak (
10
–
12
). However, it is representative of approximately 20 additional oxidatively-denved lesions known to result from radiation damage (
13
) and whose mutagenic outcome are largely unknown in mammalian-cell systems.