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Correlating Gene-specific DNA Methylation Changes with Expression and Transcriptional Activity of Astrocytic KCNJ10 Kir4.1
Published on: September 26, 2015
Blood DNA methylation pattern is altered in mesial temporal lobe epilepsy
Hong-Yu Long1, Li Feng1, Jin Kang1
1Department of Neurology, Xiangya Hospital, Central South University, Changsha, Hunan 410008, China.
Abstract:
Mesial temporal lobe epilepsy (MTLE) is a common epileptic disorder; little is known whether it is associated with peripheral epigenetic changes. Here we compared blood whole genomic DNA methylation pattern in MTLE patients (n = 30) relative to controls (n = 30) with the Human Methylation 450 K BeadChip assay, and explored genes and pathways that were differentially methylated using bioinformatics profiling. The MTLE and control groups showed significantly different (P < 1.03e-07) DNA methylation at 216 sites, with 164 sites involved hyper- and 52 sites hypo- methylation. Two hyper- and 32 hypo-methylated sites were associated with promoters, while 87 hyper- and 43 hypo-methylated sites corresponded to coding regions. The differentially methylated genes were largely related to pathways predicted to participate in anion binding, oxidoreductant activity, growth regulation, skeletal development and drug metabolism, with the most distinct ones included SLC34A2, CLCN6, CLCA4, CYP3A43, CYP3A4 and CYP2C9. Among the MTLE patients, panels of genes also appeared to be differentially methylated relative to disease duration, resistance to anti-epileptics and MRI alterations of hippocampal sclerosis. The peripheral epigenetic changes observed in MTLE could be involved in certain disease-related modulations and warrant further translational investigations.
Insights
Peripheral epigenetic changes, specifically DNA methylation patterns in blood, are significantly altered in Mesial Temporal Lobe Epilepsy (MTLE) patients compared to controls. These epigenetic alterations may play a role in disease mechanisms and warrant further investigation.
Area of Science:
- Epigenetics
- Neuroscience
- Genomics
Background:
- Mesial temporal lobe epilepsy (MTLE) is a prevalent neurological disorder.
- The association between MTLE and peripheral epigenetic modifications remains largely unexplored.
Purpose of the Study:
- To investigate whole-genome DNA methylation patterns in the blood of MTLE patients.
- To identify differentially methylated genes and pathways in MTLE.
- To explore correlations between epigenetic changes and clinical features of MTLE.
Main Methods:
- Human Methylation 450K BeadChip assay was used to compare DNA methylation in 30 MTLE patients and 30 controls.
- Bioinformatics profiling was employed to analyze differentially methylated genes and pathways.
Main Results:
- Significant differences in DNA methylation were observed at 216 sites between MTLE patients and controls (P < 1.03e-07).
- 164 sites showed hypermethylation and 52 showed hypomethylation, primarily in coding regions and promoters.
- Differentially methylated genes are linked to pathways involved in anion binding, oxidoreductant activity, growth regulation, skeletal development, and drug metabolism.
Conclusions:
- Peripheral epigenetic alterations are evident in MTLE patients.
- These changes may contribute to disease pathogenesis and could serve as potential biomarkers.
- Further translational research is recommended to explore the clinical implications of these findings.
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