Objectives. To quantify genome-wide DNA methylation in the olfactory bulbs, frontoparietal and occipital areas, and cerebellum in male Wistar rats in normal conditions and in a model of incomplete cerebral ischemia caused by permanent bilateral occlusion of the common carotid arteries. Materials and methods. The study was performed on 23 male Wistar rats, which were divided into sham operation and cerebral ischemia groups. Genome-wide DNA methylation levels at CCGG sites were determined by methyl-sensitive restriction using endonucleases MspI and HpaII, followed by densitometric analysis of electropherograms in ImageJ software. Results and conclusions. Incomplete cerebral ischemia produced 56.3% (95% CI 33.2–76.90) mortality on day 7. Surviving rats of the cerebral ischemia group, as compared with animals of the sham operation group, displayed marked neurological deficit, which was accompanied by changes in the genome-wide DNA methylation level in the nervous tissue of brain structures (p < 0.05). Incomplete cerebral ischemia in male Wistar rats was characterized by interhemispheric asymmetry in the severity and direction of the epigenomic reactions of nervous tissue in both ischemic and non-ischemic areas of the brain. It is likely that these dynamics of changes in the genome-wide DNA methylation status of nervous tissue are responsible for imparting plasticity to neuronal function during ischemic injury.
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Translated from Zhurnal Nevrologii i Psikhiatrii imeni S. S. Korsakova, Vol. 123, No. 3, Iss. 2, pp. 26–32, March, 2023.
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Shcherbak, N.S., Suchkova, I.O., Dergacheva, N.I. et al. Changes in Genome-Wide DNA Methylation Levels in Different Parts of the Rat Brain in Partial Cerebral Ischemia. Neurosci Behav Physi 53, 1360–1365 (2023). https://doi.org/10.1007/s11055-023-01526-1
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DOI: https://doi.org/10.1007/s11055-023-01526-1