Neuropsychiatric Comorbidities in Genetic Epilepsy Models

Genetic epilepsy models have revealed that affective and cognitive disorders often arise alongside seizure activity, reflecting the common clinical observation that anxiety, depression and cognitive impairment accompany many forms of epilepsy. Rodent strains harbouring inherited mutations or polygenic predispositions to absence and other seizure types display behavioural alterations even before the onset of recurrent seizures, indicating that genetic factors underpin both ictal and interictal neuropsychiatric traits. Studies in widely used models such as WAG/Rij and GAERS (Genetic Absence Epilepsy Rats from Strasbourg) have uncovered disruptions in monoaminergic, dopaminergic and GABAergic systems, often accompanied by altered expression of ion‐channel genes (for example HCN1) and epigenetic regulators (such as DNMT1). Behavioural assays reveal heightened immobility in forced‐swim tests, reduced sucrose preference, and altered exploration in elevated plus-maze or hole-board paradigms, mirroring depressive and anxiety-like phenotypes. Mechanistic work has linked these behavioural profiles to changes in dendritic spine density, aberrant chromatin remodelling, and neurotrophic factor signalling. Together, genetic models provide a powerful platform to disentangle seizure generation from comorbid affective pathology, to identify shared molecular pathways and to evaluate new interventions that might ameliorate both seizures and their psychiatric sequelae.

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Neuropsychiatric Comorbidities in Genetic Epilepsy Models publication trend

The graph below shows the total number of articles in neuropsychiatric comorbidities in genetic epilepsy models across all publications each year (not limited to Nature Index journals).

Technical terms

Genetic Absence Epilepsy Rats from Strasbourg (GAERS): An inbred polygenic rat strain modelling childhood absence epilepsy and associated behavioural changes.

WAG/Rij rat: A strain genetically predisposed to absence seizures and comorbid depression-like and anxiety-like behaviours.

Spike-wave discharges (SWDs): Synchronous electroencephalographic oscillations characteristic of absence seizures.

DNA methylation: An epigenetic mechanism where methyl groups are added to DNA, altering gene expression without changing the sequence.

CB1/2 receptors: Cannabinoid receptor subtypes that mediate endocannabinoid effects on emotion, motor function and seizure activity.

References

1. A quantitative and T‐pattern analysis of anxiety‐like behavior in male GAERS, NEC, and Wistar rats bred under the same conditions, against a commercially available Wistar control group in the hole board and elevated plus maze tests. CNS Neuroscience & Therapeutics (2023).
2. Antidepressant and Anxiolytic Effects of L-Methionine in the WAG/Rij Rat Model of Depression Comorbid with Absence Epilepsy. International Journal of Molecular Sciences (2023).
3. Maternal Methyl-Enriched Diet Increases DNMT1, HCN1, and TH Gene Expression and Suppresses Absence Seizures and Comorbid Depression in Offspring of WAG/Rij Rats. Diagnostics (2023).
4. Cannabinoid 1/2 Receptor Activation Induces Strain-Dependent Behavioral and Neurochemical Changes in Genetic Absence Epilepsy Rats From Strasbourg and Non-epileptic Control Rats. Frontiers in Cellular Neuroscience (2022).