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Verbal memory dysfunction is associated with alterations in brain transcriptome in dominant temporal lobe epilepsy.

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Genetic differences in temporal lobe epilepsy (TLE) impact memory. Gene expression changes and microRNAs in brain tissue may offer new biomarkers and treatments for memory loss in TLE patients.

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Area of Science:

  • Neuroscience
  • Genetics
  • Molecular Biology

Background:

  • Memory dysfunction is common in neurological disorders, significantly impacting quality of life.
  • Genetic factors contributing to memory impairment in epilepsy, especially temporal lobe epilepsy (TLE), are not well understood.
  • Episodic memory is crucial for daily functioning and is often affected in TLE.

Purpose of the Study:

  • To compare the brain transcriptome between TLE patients with and without verbal memory impairments.
  • To identify specific genes and signaling networks associated with episodic memory deficits in TLE.
  • To explore the role of microRNAs (miRNAs) in TLE-associated memory dysfunction.

Main Methods:

  • Analysis of brain tissue transcriptome (RNA-Seq) from 23 TLE patients undergoing temporal lobectomy.
  • Stratification of patients into memory-impaired and memory-intact groups based on preoperative memory tests.
  • Pathway and integrative analyses, including small RNA-Seq, to identify differentially expressed genes (DETs) and miRNAs.

Main Results:

  • Identified 1092 differentially expressed transcripts (DETs), with 71% underexpressed in memory-impaired TLE patients.
  • Enrichment analysis revealed pathways related to neurodegeneration, memory, and cognition, including genes like APP, MAPT, and PINK1.
  • Discovered four differentially expressed miRNAs predicted to target a subset of DETs, impacting memory-related pathways.

Conclusions:

  • Gene expression profiles in the temporal lobe are associated with memory status in TLE.
  • MicroRNAs may act as upstream regulators of differential gene expression, serving as potential biomarkers for memory impairment.
  • Identifying these molecular signatures offers potential therapeutic targets for improving memory in TLE.