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The role of GABAergic system in neurodevelopmental disorders: a focus on autism and epilepsy
Insights
Autism spectrum disorder (ASD) and epilepsy share common neurodevelopmental origins, often linked to GABAergic circuit dysfunction. This imbalance in neuronal inhibition may be a key factor in both childhood neurological disorders.
Area of Science:
- Neuroscience
- Developmental disorders
- Neurology
Background:
- Autism spectrum disorder (ASD) and epilepsy are prevalent childhood neurological conditions.
- These disorders frequently co-occur, suggesting shared underlying causes.
- Genetic, neuroimaging, and neuropathological studies support common neurodevelopmental bases.
Purpose of the Study:
- To review evidence supporting GABAergic circuit dysfunction as a common pathogenetic mechanism for ASD and epilepsy.
- To explore the link between neurodevelopmental defects in GABAergic circuitry and these disorders.
Main Methods:
- Review of significant genetic, neuroimaging, and neuropathological studies.
- Analysis of research on animal models and postmortem human samples.
- Examination of studies investigating GABAergic neuron and circuit alterations.
Main Results:
- Evidence indicates altered GABAergic neurons and circuits in both ASD and epilepsy.
- Dysfunction of inhibitory GABAergic circuits is proposed as a cause for both conditions.
- An excitation/inhibition imbalance due to GABAergic defects is a potential common mechanism.
Conclusions:
- GABAergic circuit dysfunction is a significant shared neurodevelopmental basis for ASD and epilepsy.
- This imbalance contributes to the pathogenesis of both disorders.
- Further research into GABAergic mechanisms is warranted.
Abstract:
Autism spectrum disorders (ASD) and epilepsy are very common neurological disorders of childhood, with an estimated incidence of about 0.5 - 1 % in worldwide population. ASD and epilepsy are often associated, suggesting that common neurodevelopmental bases may exist for these two disorders. The neurodevelopmental bases of both ASD and epilepsy have been clearly showed by a number of genetic, neuroimaging and neuropathological studies. In recent years, dysfunction of inhibitory GABAergic circuits has been proposed as a cause for both disorders. Several studies performed on both animal models and postmortem human samples indicate that GABAergic neurons and circuits are altered in both ASD and epilepsy, suggesting that the excitation/inhibition imbalance resulting from neurodevelopmental defects in GABAergic circuitry might represent a common pathogenetic mechanism for these disorders. Here, we will review the most significant studies supporting this hypothesis.
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