Development of the adductome approach to detect DNA damage in humans

Abstract

The development of new strategies designed to detect DNA damage caused by oxidative stress and other means may advance our understanding of the roles of such types of damage in the etiology of cancers, in aging processes, and as biomarkers of exposure. A DNA adduct detection method that uses liquid chromatography coupled with electrospray ionization tandem mass spectrometry (LC/ESI-MS/MS) to detect multiple DNA adducts in human lung tissue is reported herein. This adductome analysis strategy is designed to detect the neutral loss of 2 -deoxyribose from positively ionized 2 -deoxynucleoside adducts in multiple reaction ion monitoring mode (MRM) transmitting the [M + H](+) > [M + H - 116](+) transition over a total of 374 transitions in the mass range from m/z 228.8 to m/z 602.8. Data analysis is optimized and coupled with a comprehensive manual screening process designed to minimize the number of artifactual adducts appearing in the final analysis. In the final analysis, putative adducts were organized into an adductome map and unambiguous confirmation of selected oxidative adducts were made by stable isotope dilution and comparison to authentic standards. The future applications of this method are discussed.