Neuronal and glial DNA methylation and gene expression changes in early epileptogenesis

Autoři: Toni C. Berger aff001;  Magnus D. Vigeland aff003;  Hanne S. Hjorthaug aff003;  Lars Etholm aff004;  Cecilie G. Nome aff002;  Erik Taubøll aff001;  Kjell Heuser aff001;  Kaja K. Selmer aff003
Působiště autorů: Department of Neurology, Oslo University Hospital, Oslo, Norway aff001;  University of Oslo, Oslo, Norway aff002;  Department of Medical Genetics, Oslo University Hospital and University of Oslo, Oslo, Norway aff003;  National Center for Epilepsy, Oslo University Hospital, Sandvika, Norway aff004;  Department of Neurology, Section for Neurophysiology, Oslo University Hospital, Oslo, Norway aff005;  Division of Clinical Neuroscience, Department of Research and Development, Oslo University Hospital, Oslo, Norway aff006
Vyšlo v časopise: PLoS ONE 14(12)
Kategorie: Research Article


Background and aims

Mesial Temporal Lobe Epilepsy is characterized by progressive changes of both neurons and glia, also referred to as epileptogenesis. No curative treatment options, apart from surgery, are available. DNA methylation (DNAm) is a potential upstream mechanism in epileptogenesis and may serve as a novel therapeutic target. To our knowledge, this is the first study to investigate epilepsy-related DNAm, gene expression (GE) and their relationship, in neurons and glia.


We used the intracortical kainic acid injection model to elicit status epilepticus. At 24 hours post injection, hippocampi from eight kainic acid- (KA) and eight saline-injected (SH) mice were extracted and shock frozen. Separation into neurons and glial nuclei was performed by flow cytometry. Changes in DNAm and gene expression were measured with reduced representation bisulfite sequencing (RRBS) and mRNA-sequencing (mRNAseq). Statistical analyses were performed in R with the edgeR package.


We observed fulminant DNAm- and GE changes in both neurons and glia at 24 hours after initiation of status epilepticus. The vast majority of these changes were specific for either neurons or glia. At several epilepsy-related genes, like HDAC11, SPP1, GAL, DRD1 and SV2C, significant differential methylation and differential gene expression coincided.


We found neuron- and glia-specific changes in DNAm and gene expression in early epileptogenesis. We detected single genetic loci in several epilepsy-related genes, where DNAm and GE changes coincide, worth further investigation. Further, our results may serve as an information source for neuronal and glial alterations in both DNAm and GE in early epileptogenesis.

Klíčová slova:

DNA methylation – Gene expression – Immune receptor signaling – Immune receptors – Neurons – Protein domains – Cytokine receptors – Transmembrane receptors


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