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. 1999 Aug 1;27(15):3153–3158. doi: 10.1093/nar/27.15.3153

Repair of oxidative DNA base lesions induced by fluorescent light is defective in xeroderma pigmentosum group A cells.

L J Lipinski 1, N Hoehr 1, S J Mazur 1, G L Dianov 1, S Sentürker 1, M Dizdaroglu 1, V A Bohr 1
PMCID: PMC148542  PMID: 10454612

Abstract

Fluorescent light (FL) has been shown to generate free radicals within cells, however, the specific chemical nature of DNA damage induced by FL has not previously been determined. Using gas chromatography/isotope dilution mass spectrometry, we have detected induction of the oxidative DNA lesions 5-hydroxycytosine (5-OH-Cyt), 2,6-diamino-4-hydroxy-5-formamidopyrimidine (FapyGua) and 4, 6-diamino-5-formamidopyrimidine (FapyAde) in cultured cells irradiated with FL. We followed the repair of these lesions in normal and xeroderma pigmentosum group A (XP-A) cells. 5-OH-Cyt and FapyGua were repaired efficiently in normal cells within 6 h following FL exposure. XP-A cells were unable to repair these oxidative DNA base lesions. Additionally, to compare the repair of oxidative lesions induced by various sources, in vitro repair studies were performed using plasmid DNA damaged by FL, gamma-irradiation or OsO(4)treatment. Whole cell extracts from normal cells repaired damaged substrates efficiently, whereas there was little repair in XP-A extracts. Our data demon-strate defective repair of oxidative DNA base lesions in XP-A cells in vivo and in vitro.

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Selected References

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