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Anteromesial Temporal Lobectomy for Medically Intractable Temporal Lobe Epilepsy: An Operative Study
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Transcriptomic and genetic analyses reveal potential causal drivers for intractable partial epilepsy.

Sebastian Guelfi1, Juan A Botia1,2, Maria Thom3

  • 1Department of Molecular Neuroscience, UCL, Institute of Neurology, Queen Square, London, UK.

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Summary

This study identifies gene expression changes linked to mesial temporal lobe epilepsy with hippocampal sclerosis. These findings reveal potential therapeutic targets and genetic risk variants for epilepsy and drug resistance.

Keywords:
co-expression regulatory networkhippocampal sclerosishuman brain eQTLsmesial temporal epilepsysplicing

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Area of Science:

  • Neurogenetics
  • Epilepsy Research
  • Transcriptomics

Background:

  • Mesial temporal lobe epilepsy with hippocampal sclerosis (MTLE-HS) is the most common cause of intractable partial epilepsy in adults.
  • The genetic underpinnings of MTLE-HS are complex and not fully understood, involving dysregulation of biological networks.
  • Expression quantitative trait loci (eQTLs) analysis offers a complementary approach to genome-wide association studies for identifying genetic risk loci.

Purpose of the Study:

  • To investigate gene expression changes and identify expression quantitative trait loci (eQTLs) associated with mesial temporal lobe epilepsy with hippocampal sclerosis (MTLE-HS).
  • To explore transcriptional and splicing deregulation in MTLE-HS cortical tissue.
  • To uncover gene networks involved in neuronal and glial mechanisms contributing to epilepsy pathogenesis and maintenance.

Main Methods:

  • Whole transcriptome analysis (gene and exon-level) was performed on cortical tissue (Brodmann areas 20 and 21) from 86 MTLE-HS patients and 75 healthy controls.
  • Genome-wide genotyping data from the same individuals were analyzed and paired with transcriptome data.
  • Expression quantitative trait loci (eQTLs) analysis was conducted to identify regulatory variants associated with gene expression changes.

Main Results:

  • Potential epilepsy-risk eQTLs were identified, with some being specific to MTLE-HS tissue.
  • Significant transcriptional and splicing deregulation was observed in MTLE-HS tissue.
  • Gene networks implicated in neuronal and glial functions were identified, offering new insights into seizure mechanisms.

Conclusions:

  • The study provides novel insights into the genetic and molecular basis of mesial temporal lobe epilepsy with hippocampal sclerosis (MTLE-HS).
  • Identified eQTLs and deregulated gene networks may serve as potential therapeutic targets and biomarkers for MTLE-HS.
  • The findings facilitate the identification of genetic risk variants influencing epilepsy and pharmacoresistance, with data available via the 'Seizubraineac' web-tool.