Sodium-activated potassium channel subunit alpha-1 (KCNT1)

The KCNT1 gene encodes the Sodium-activated potassium channel subunit alpha-1, a high-conductance channel also known as Slack or Slo2.2 [1, 8]. This channel is predominantly expressed in the mammalian brain, particularly in the cerebral cortex, hippocampus, and cerebellum, where it mediates sodium-activated potassium (KNa) currents that regulate neuronal excitability and the slow hyperpolarization following repetitive action potentials [1, 11]. KCNT1 is a critical therapeutic target because gain-of-function (GoF) mutations in the channel are the primary genetic cause of severe early-onset epilepsies, including Epilepsy of Infancy with Migrating Focal Seizures (EIMFS) and Autosomal Dominant Sleep-Related Hypermotor Epilepsy (ADSHE) [9, 12]. These mutations lead to excessive potassium conductance, causing paradoxical hyperexcitability in neuronal networks [8, 11]. Therapeutic strategies focus on identifying small-molecule inhibitors to normalize channel activity. While the anti-arrhythmic quinidine has been used off-label as a precision therapy, its efficacy is inconsistent, prompting research into novel potent inhibitors like hydroquinine and tipepidine, particularly for specific human isoforms such as KCNT1B [1, 10].

Other names

SlackSlo2.2KNa1.1KNa1SIKPotassium sodium-activated channel subfamily T member 1hKCNT1B isoform

Small molecule inhibition/blockade of the potassium channel pore to reduce the excessive outward potassium current caused by gain-of-function mutations [1, 10, 11].