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Evaluating reference genes to normalize gene expression in human epileptogenic brain tissues.

Stephan Wierschke1, Sylvain Gigout, Peter Horn

  • 1Charité Universitätsmedizin Berlin, Center for Anatomy, Institute of Cell Biology and Neurobiology, Berlin, Germany.

Biochemical and Biophysical Research Communications
|November 18, 2010
PubMed
Summary

Reliable gene expression analysis in epilepsy requires validated reference genes. Synaptophysin (SYP), neuron-specific enolase (NSE), and mitochondrial 39S ribosomal protein L28 (MRPL) are recommended for normalizing gene expression in human temporal lobe epilepsy tissue.

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Area of Science:

  • Neuroscience
  • Molecular Biology
  • Genetics

Background:

  • Accurate quantification of gene expression in human epilepsy surgery tissue is essential for understanding disease mechanisms.
  • Previous studies have used various reference genes, but their reliability in temporal lobe epilepsy (TLE) remains underexplored.

Purpose of the Study:

  • To evaluate the stability and suitability of 12 candidate reference genes for normalizing gene expression in human neocortical TLE tissue.
  • To identify the most reliable normalization factors (NFs) for accurate interpretation of gene expression changes in epilepsy.

Main Methods:

  • Analysis of 12 potential reference genes in neocortical tissues from TLE patients (few/many seizures) and post-mortem controls using geNorm and NormFinder algorithms.
  • Measurement of threshold cycle (C(T)) values for all candidate reference genes.

Main Results:

  • geNorm identified synaptophysin (SYP), neuron-specific enolase (NSE), and mitochondrial 39S ribosomal protein L28 (MRPL) as most stably expressed.
  • NormFinder suggested TATA-box binding protein (TBP) and NSE as the optimal NF combination.
  • Normalization method significantly impacted glial fibrillary protein (GFAP) expression fold-change values, highlighting the importance of NF selection.

Conclusions:

  • The geometric mean of SYP, NSE, and MRPL (geNorm-NF) or the geometric mean of TBP and NSE (NormFinder-NF) are suitable for normalizing gene expression in human epileptogenic neocortex.
  • Using single, less stable reference genes like hypoxanthine phosphoribosyl-transferase (HPRT) can lead to inaccurate results in epilepsy gene expression studies.