Scn1a-KO Mouse

The SCN1A gene encodes the α subunit of the voltage-gated sodium channel Nav1.1, which is a critical gene for maintaining neuronal excitability regulation and neural signal transmission. Loss-of-function mutations in SCN1A are closely associated with various epilepsy syndromes, with Dravet syndrome (DS) being the most typical example ^[1]. SCN1A mutations primarily affect GABAergic inhibitory interneurons, leading to impaired inhibitory neural circuits, disruption of the excitation/inhibition (E/I) balance, and increased epilepsy susceptibility ^[2].

Scn1a-KO mice recapitulate epilepsy phenotypes associated with SCN1A loss-of-function by deleting the mouse Scn1a gene. These models are suitable for anti-epileptic drug screening, validation of SCN1A gene therapy strategies, investigation of epilepsy pathogenesis, and intervention studies of neuropsychiatric comorbidities.

Homozygous Scn1a knockout mice typically exhibit severe neurological abnormalities, including early postnatal lethality, seizures, and pronounced behavioral deficits. Heterozygous knockout mice display spontaneous seizures, premature death, and abnormal neurophysiological activity. Therefore, when studying SCN1A-related disorders, conditional knockout strategies are recommended. These approaches enable tissue- or cell-type-specific regulation of Scn1a deletion, allowing further dissection of how Nav1.1 functional deficits in different neural circuits contribute to epilepsy and associated neurobehavioral abnormalities.