Abstract
In this study, we compared the effects of gamma and high-energy proton radiation (1000 MeV) on DNA in aqueous saline solutions (5 and 150 mM NaCl) at doses of 30 and 50 Gy. We used spectral methods (the ultraviolet absorption method, spectrophotometric methods for nucleic acid quantification, spectrophotometric DNA melting, and circular dichroism) for the estimation of the number of damaged nitrogenous bases and damage of the secondary DNA structure. It was found that under these conditions, proton radiation causes more severe destruction of nitrogenous bases and the secondary DNA structure than exposure to gamma rays at the same dose. In DNA irradiated with protons, the formation of crosslinks is possible and the probability for crosslinking increases with the increase of the ionic strength of the irradiated solution.
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ACKNOWLEDGMENTS
This work was carried out using the equipment of the Research park of St.Petersburg State University at “Center for Optical and Laser Research” and “Center for Nanofabrication of Photoactive Materials (Nanophotonics)”.
Funding
This study was supported by the Russian Foundation for Basic Research (project no. 18-08-01500).
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Translated by A. Boutanaev
Abbreviations: LET is linear energy transfer, CD is circular dichroism.
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Kotb, O.M., Brozhik, D.S., Verbenko, V.N. et al. Investigation of DNA Damage Induced by Proton and Gamma Radiation. BIOPHYSICS 66, 202–208 (2021). https://doi.org/10.1134/S0006350921020123
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DOI: https://doi.org/10.1134/S0006350921020123