Sodium channel protein type 1 subunit alpha (Nav1.1) and other central nervous system voltage-gated sodium channels (Nav1.1 and central Nav channels)

Voltage-gated sodium channels (Nav) are transmembrane proteins essential for the generation and propagation of action potentials in excitable cells [1][2]. In the central nervous system, the Nav1.1, Nav1.2, Nav1.3, and Nav1.6 subtypes are the primary mediators of sodium current, with Nav1.1 (encoded by the SCN1A gene) being particularly critical for the function of GABAergic inhibitory interneurons [1][4]. Dysregulation or mutation of these channels is a primary cause of various epilepsy syndromes and neurodevelopmental disorders; for instance, loss-of-function mutations in SCN1A lead to Dravet syndrome, a severe form of childhood epilepsy [4]. Conversely, gain-of-function mutations in Nav1.2 or Nav1.6 are associated with early-onset epileptic encephalopathies [2]. Therapeutic strategies include traditional sodium channel blockers that reduce overall neuronal excitability and newer, more selective approaches aimed at either inhibiting specific overactive subtypes or augmenting Nav1.1 activity to restore inhibitory balance [3]. Understanding the specific subtype involvement is crucial for effective treatment, as non-selective blockers can sometimes worsen symptoms in patients with specific genetic profiles [4].

Other names

SCN1ASCN2ASCN3ASCN8ANav1.1Nav1.2Nav1.3Nav1.6Voltage-gated sodium channel alpha subunit

Stabilization of the inactivated state of voltage-gated sodium channels to inhibit high-frequency neuronal firing [3]; or selective potentiation of Nav1.1 to enhance inhibitory interneuron activity [4].