Singlet oxygen-mediated damage to cellular DNA determined by the comet assay associated with DNA repair enzymes
- 5 January 2004
- journal article
- research article
- Published by Walter de Gruyter GmbH in Biological Chemistry
- Vol. 385 (1) , 17-20
- https://doi.org/10.1515/bc.2004.003
Abstract
The damage profile produced by the reaction of singlet molecular oxygen with cellular DNA was determined using the comet assay associated with DNA repair enzymes. Singlet oxygen was produced intracellularly by thermal decomposition of a watersoluble endoperoxide of a naphthalene derivative which is able to penetrate through the membrane into mammalian cells. We found that the DNA modifications produced by singlet oxygen were almost exclusively oxidised purines recognised by the formamidopyrimidine DNA N-glycosylase. In contrast, significant amounts of direct strand breaks and alkalilabile sites or oxidised pyrimidines, detectable by the bacterial endonuclease III, were not produced.Keywords
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