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This study investigates how neural circuits become susceptible to seizures using Angelman syndrome mouse models, which lack the maternal Ube3a gene. The researchers found that parvalbumin-expressing inhibitory neurons are critical regulators of seizure development, and that the dentate gyrus region of the hippocampus undergoes abnormal remodeling during epileptogenesis. In Angelman syndrome mice, seizure kindling fails to trigger normal compensatory inhibitory mechanisms and instead causes maladaptive increases in neuronal excitability, representing a "two-hit" pathological process.
Why it matters
These findings identify specific cell types and brain regions involved in epilepsy development, potentially enabling more targeted therapeutic approaches for Angelman syndrome and other epilepsies. Understanding the failure of homeostatic plasticity mechanisms could guide development of interventions that restore proper inhibitory circuit function before seizures become established.
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⚠️ Preprint – Noch nicht peer-reviewed
Dieser Artikel wurde noch nicht von unabhängigen Experten begutachtet. Die Ergebnisse sind vorläufig und sollten mit Vorsicht interpretiert werden.
Understanding how neural circuits transition from seizure-resistant to seizure-prone is essential for developing improved epilepsy therapies. Here, we study this process by leveraging the heightened susceptibility to seizure kindling of Angelman syndrome (AS) model mice, which lack the maternal Ube3a (mUbe3a) allele. We identify parvalbumin-expressing (PV+) interneurons as critical gatekeepers; selective mUbe3a deletion in PV+ neurons phenocopies enhanced AS epileptogenesis, whereas restoring UBE3A broadly in GABAergic neurons confers seizure resistance. Further, pathological remodeling of the extracellular matrix in the dentate gyrus faithfully tracks with post-kindling seizure susceptibility, highlighting this region’s particular relevance to enhanced epileptogenesis. Mechanistically, we uncover a ‘two-hit’ electrophysiologic phenomenon in AS model mice: kindling fails to recruit compensatory inhibition onto dentate granule cells and instead drives their maladaptive intrinsic hyperexcitability. Together, these findings link cell type-specific inhibitory dysfunction and altered homeostatic plasticity to epileptogenesis, suggesting future circuit-based treatment strategies.