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Identifying candidate genes associated with hippocampal dysfunction in a hemiparkinsonian rat model by transcriptomic
Bohye Kim1, Sungmoo Hong2, Jeongmin Lee1
1Department of Veterinary Anatomy and Animal Behavior, College of Veterinary Medicine and BK21 FOUR Program, Chonnam National University, Gwangju, Republic of Korea.
Animal Cells and Systems
|May 2, 2024
Summary
This study identified 1018 differentially expressed genes in the rat hippocampus after inducing Parkinson's disease (PD) using 6-hydroxydopamine (6-OHDA). These genetic changes reveal key pathways involved in PD-related hippocampal dysfunction.
Area of Science:
- Neuroscience
- Genetics
- Molecular Biology
Background:
- Parkinson's disease (PD) is associated with hippocampal dysfunction, leading to cognitive and emotional deficits.
- Synaptic irregularities in the hippocampus are a hallmark of PD-induced cognitive impairment.
Purpose of the Study:
- To investigate behavioral anomalies in a hemiparkinsonian rat model.
- To identify differentially expressed genes (DEGs) in the hippocampus to understand PD-related dysfunction.
- To uncover novel genetic candidates linked to hippocampal dysfunction in PD.
Main Methods:
- Unilateral striatal 6-hydroxydopamine (6-OHDA) infusions in adult Sprague-Dawley rats to model hemiparkinsonism.
- RNA sequencing and gene expression analysis to identify DEGs in the hippocampus.
- Gene Ontology (GO) and Kyoto Encyclopedia of Genes and Genomes (KEGG) pathway analyses to interpret DEG functions.
Main Results:
- 1018 DEGs identified in the hippocampus (631 upregulated, 387 downregulated) post-6-OHDA infusion (FDR < 0.05, fold-change > 1.5).
- GO analysis revealed enrichment in synaptic signaling, axon development, and neurotransmitter receptor activity.
- KEGG analysis highlighted significant enrichment in neuroactive ligand-receptor interactions, calcium, cAMP, axon guidance, and Notch signaling pathways.
Conclusions:
- The study provides a comprehensive transcriptomic profile of the hippocampus in a hemiparkinsonian rat model.
- Identified DEGs and enriched pathways offer insights into the molecular mechanisms of PD-related hippocampal dysfunction.
- Key hub genes like Notch3 and Grin2d were identified, warranting further investigation for therapeutic targets.
