Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5499327 | Radiation Physics and Chemistry | 2016 | 6 Pages |
Abstract
This mini-review focuses on the recent identification of several novel radiation-induced single and tandem modifications in cellular DNA. For this purpose accurate high-performance electrospray ionization tandem mass spectrometry (HPLC-ESI-MS/MS) was applied allowing their quantitative measurement and unambiguous characterization. Exposure of human cells to gamma rays led to the formation of several modified bases arising from the rearrangement of the pyrimidine ring of thymine, cytosine and 5-methylcytosine subsequent to initial addition of an hydroxyl radical (
- OH) to the 5,6-ethylenic bond. In addition, 5-hydroxymethylcytosine, an novel epigenetic mark, and 5-formylcytosine, were found to be generated consecutively to
- OH-mediated hydrogen abstraction from the methyl group of 5-methylcytosine. Relevant mechanistic information on one-oxidation reactions of cellular DNA was also gained from the detection of 5-hydroxycytosine and guanine-thymine intra-strand adducts whose formation is rationalized by the generation of related base radical cation. Attempts to search for the radiation-induced formation of purine 5â²,8-cyclo-2â²-deoxyribonucleosides were unsuccessful with the exception of trace amounts of (5â²S)-5â²,8-cyclo-2â²-deoxyadenosine.
- OH) to the 5,6-ethylenic bond. In addition, 5-hydroxymethylcytosine, an novel epigenetic mark, and 5-formylcytosine, were found to be generated consecutively to
- OH-mediated hydrogen abstraction from the methyl group of 5-methylcytosine. Relevant mechanistic information on one-oxidation reactions of cellular DNA was also gained from the detection of 5-hydroxycytosine and guanine-thymine intra-strand adducts whose formation is rationalized by the generation of related base radical cation. Attempts to search for the radiation-induced formation of purine 5â²,8-cyclo-2â²-deoxyribonucleosides were unsuccessful with the exception of trace amounts of (5â²S)-5â²,8-cyclo-2â²-deoxyadenosine.
Related Topics
Physical Sciences and Engineering
Physics and Astronomy
Radiation
Authors
Jean Cadet, J. Richard Wagner,