Abstract
Guanine in DNA is a major oxidation target owing to its low ionization potential (IP), and there is often an inverse correlation between damage frequency and sequence-dependent variation in guanine IP. We report that the biological oxidant nitrosoperoxycarbonate (ONOOCO2–) paradoxically selects guanines with the highest IP in GC-containing contexts. Along with sequence-dependent variation in damage chemistry, this behavior points to factors other than charge migration as determinants of genomic DNA oxidation.
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Acknowledgements
This research was supported by the National Cancer Institute (CA110261 and CA026731) and the National Institute of Environmental Health Sciences (ES002109).
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Supplementary information
Supplementary Fig. 1
Illustrative sequencing gel (PDF 33 kb)
Supplementary Fig. 2
Comparison of Fpg- and piperidine-induced DNA cleavage (PDF 94 kb)
Supplementary Fig. 3
Damage in single-stranded oligos (PDF 73 kb)
Supplementary Fig. 4
Illustrative LMPCR gel (PDF 229 kb)
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Margolin, Y., Cloutier, JF., Shafirovich, V. et al. Paradoxical hotspots for guanine oxidation by a chemical mediator of inflammation. Nat Chem Biol 2, 365–366 (2006). https://doi.org/10.1038/nchembio796
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DOI: https://doi.org/10.1038/nchembio796
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