FAPy-adenine is an oxidized DNA base. Fapy-adenine shows an increased trend levels in the Alzheimer's disease brain. Oxidized nucleosides are biochemical markers for tumors, aging, and neurodegenerative diseases[1][2][3].
In the absence of the external field the FAPy-adenine is able to form pairs with all four canonical nucleic acid bases. In contrast, in the presence of the external field the mispairing abilities of FAPy-adenine become insignificant since the most stable dimers are formed with thymine[1].
The nuclear DNA damage by oxygen-derived radicals is increased in Alzheimer's disease and support the concept that the brain is under increased oxidative stress in Alzheimer's disease[1].
[1]. Gabbita SP, et al. Increased nuclear DNA oxidation in the brain in Alzheimer's disease. [2]. Cysewski P, et al. Theoretical description of the coding potential of diamino-5-formamidopyrimidines. Z Naturforsch C J Biosci. 1999 Mar-Apr;54(3-4):239-45. [3]. Lee SH, et al. A rapid and sensitive method for quantitation of nucleosides in human urine using liquid chromatography/mass spectrometry with direct urine injection. Rapid Commun Mass Spectrom. 2004;18(9):973-7.