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Beyond Impaired GABAergic Signaling: Inflammation and Metabolic Dysfunction in Genetic Epilepsy Induced by GABRG2
Dingding Shen1, Wenwen Wu2,3,4, Jing Zhou2,5
1Department of Neurology in Affiliated Hospital of Nantong University, Jiangsu Key Laboratory of Tissue Engineering and Neuroregeneration, Key Laboratory of Neuroregeneration of Ministry of Education, Medical school, Co-innovation Center of Neuroregeneration, Nantong University, Nantong, China.
Molecular Neurobiology
|November 5, 2025
Summary
Genetic epilepsy mutations disrupt brain cell communication and metabolism. Zebrafish models show this mutation causes seizures, neuroinflammation, and metabolic issues, suggesting new therapeutic targets.
Area of Science:
- Neuroscience
- Genetics
- Molecular Biology
Background:
- Genetic epilepsies linked to GABRG2 mutations are studied via ion channel function.
- Neuroinflammation and metabolic issues are implicated in acquired epilepsies.
Purpose of the Study:
- Investigate neuroinflammation and metabolic disturbances in genetic epilepsies.
- Characterize a novel transgenic zebrafish model (Tg(hGABRG2I107T)) for GABRG2-related epilepsy.
Main Methods:
- Generated Tg(hGABRG2I107T) zebrafish to model GABRG2(I107T) mutation.
- Assessed seizure-like behaviors, electrophysiology, and c-fos expression.
- Analyzed gene expression (transcriptome), protein localization, synaptic structure, and cellular metabolism (ATP, mitochondrial density).
- Utilized HEK293T cells for in vitro validation.
- Tested pharmacological interventions (dexamethasone, INCB3344).
Main Results:
- Tg(hGABRG2I107T) zebrafish displayed spontaneous seizures, hyperexcitability, and altered γ2 subunit localization.
- Observed disrupted neuronal markers, synaptic abnormalities, and excitatory/inhibitory imbalance.
- Transcriptome analysis revealed enrichment in ER protein processing, metabolic pathways, and TGF-β signaling.
- Found upregulation of pro-inflammatory factors and downregulation of TCA cycle genes.
- Demonstrated reduced TCA gene expression, ATP levels, and mitochondrial density in mutant cells.
- Showed that dexamethasone and INCB3344 treatments ameliorated seizure-like behaviors.
Conclusions:
- The GABRG2(I107T) mutation impairs receptor trafficking, induces ER stress, and disrupts inflammatory and metabolic pathways.
- These disruptions lead to excitatory/inhibitory imbalance, contributing to genetic epilepsy pathogenesis.
- Neuroinflammation plays a causal role in epileptogenesis for this genetic epilepsy model.
- Targeting neuroinflammation and metabolic pathways offers potential therapeutic strategies.
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