Differential DNA Methylation Patterns Define Status Epilepticus and Epileptic Tolerance
| Autor: | Eva M. Jimenez-Mateos, Patrick G. Buckley, Takanori Sano, Raymond L. Stallings, David C. Henshall, Sudipto Das, Suzanne F. C. Miller-Delaney, Kenneth Bryan |
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| Rok vydání: | 2012 |
| Předmět: |
Male
Down-Regulation Status epilepticus Biology Bioinformatics Mice Epilepsy Status Epilepticus Gene expression medicine Animals Gene Genetics General Neuroscience Promoter Articles DNA Methylation medicine.disease CA3 Region Hippocampal Mice Inbred C57BL nervous system CpG site Chromosomal region DNA methylation medicine.symptom Genome-Wide Association Study |
| Zdroj: | The Journal of Neuroscience. 32:1577-1588 |
| ISSN: | 1529-2401 0270-6474 |
| DOI: | 10.1523/jneurosci.5180-11.2012 |
| Popis: | Prolonged seizures (status epilepticus) produce pathophysiological changes in the hippocampus that are associated with large-scale, wide-ranging changes in gene expression. Epileptic tolerance is an endogenous program of cell protection that can be activated in the brain by previous exposure to a non-harmful seizure episode before status epilepticus. A major transcriptional feature of tolerance is gene downregulation. Here, through methylation analysis of 34,143 discrete loci representing all annotated CpG islands and promoter regions in the mouse genome, we report the genome-wide DNA methylation changes in the hippocampus after status epilepticus and epileptic tolerance in adult mice. A total of 321 genes showed altered DNA methylation after status epilepticus alone or status epilepticus that followed seizure preconditioning, with >90% of the promoters of these genes undergoing hypomethylation. These profiles included genes not previously associated with epilepsy, such as the polycomb genePhc2. Differential methylation events generally occurred throughout the genome without bias for a particular chromosomal region, with the exception of a small region of chromosome 4, which was significantly overrepresented with genes hypomethylated after status epilepticus. Surprisingly, only few genes displayed differential hypermethylation in epileptic tolerance. Nevertheless, gene ontology analysis emphasized the majority of differential methylation events between the groups occurred in genes associated with nuclear functions, such as DNA binding and transcriptional regulation. The present study reports select, genome-wide DNA methylation changes after status epilepticus and in epileptic tolerance, which may contribute to regulating the gene expression environment of the seizure-damaged hippocampus. |
| Databáze: | OpenAIRE |
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