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Paradoxical hotspots for guanine oxidation by a chemical mediator of inflammation

A Corrigendum to this article was published on 01 March 2007

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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Figure 1: Sequence-selective guanine oxidation in duplex DNA by ONOOCO2 and riboflavin-mediated photooxidation3.
Figure 2: Sequence selectivity of ONOOCO2-induced guanine oxidation chemistry.

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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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Correspondence to Peter C Dedon.

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The authors declare no competing financial interests.

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)

Supplementary Methods (PDF 23 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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