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Using Postmortem hippocampi tissue can interfere with differential gene expression analysis of the epileptogenic
João Paulo Lopes Born1, Heloisa de Carvalho Matos1, Mykaella Andrade de Araujo1
1Department of Cellular and Molecular Biology, Institute of Biological Sciences and Health, Federal University of Alagoas, Maceio, Alagoas, Brazil.
Plos One
|August 8, 2017
Summary
Postmortem interval (PMI) significantly alters gene expression in brain tissue, potentially masking epilepsy-related changes. Researchers must account for PMI in gene expression studies to avoid inaccurate conclusions in epilepsy research.
Area of Science:
- Neuroscience
- Molecular Biology
- Epilepsy Research
Background:
- Autopsy brain tissue is crucial for neuropathological studies.
- Gene expression changes occur during epilepsy.
- Postmortem changes can affect gene transcript detection.
Purpose of the Study:
- To evaluate the impact of postmortem interval (PMI) on gene expression in a rat model of mesial temporal lobe epilepsy (MTLE).
- To determine if PMI influences differential gene expression analysis in epilepsy research.
Main Methods:
- Compared hippocampal gene expression in rats with varying PMIs (0h vs. 6h).
- Assessed the effect of PMI on gene expression in acute and chronic Pilocarpine (PILO)-induced status epilepticus (SE) models.
- Selected six key genes (Gfap, Ppia, Gad65, Gad67, Npy, Tnf-α) for analysis.
Main Results:
- A 6h PMI increased Npy and Ppia transcripts and decreased Tnf-α transcripts.
- PMI-related changes masked or altered gene expression patterns in both acute and chronic epilepsy models.
- Npy and Ppia expression differences were observed between PMI groups and epilepsy stages.
Conclusions:
- Postmortem interval significantly influences gene transcription in brain tissue.
- Failure to account for PMI can lead to erroneous conclusions in epilepsy gene expression studies.
- Researchers should incorporate PMI considerations into experimental designs for accurate neuropathological findings.
