Voltage-gated potassium channel Kv1, Kv2, and Kv7 subfamilies (Kv1/Kv2/Kv7)

Voltage-gated potassium (Kv) channels of the Kv1, Kv2, and Kv7 subfamilies are critical regulators of electrical excitability in the nervous and cardiovascular systems. The Kv1 (Shaker-related) and Kv2 (Shab-related) subfamilies primarily function as delayed rectifiers that mediate the repolarization phase of action potentials, thereby determining the duration and frequency of electrical impulses. The Kv7 (KCNQ) subfamily is responsible for the M-current, a slow-activating potassium current that serves as a physiological brake on neuronal firing by stabilizing the resting membrane potential. Mutations or dysregulation in these channels are linked to severe neurological disorders, including various forms of epilepsy, ataxia, and neuropathic pain, as well as cardiac arrhythmias. Pharmacological intervention involves either blocking these channels to enhance neurotransmission (as seen with Kv1 blockers in multiple sclerosis) or activating them to suppress hyperexcitability (as seen with Kv7 openers in epilepsy). This specific grouping is heterogeneous, as it combines three distinct subfamilies with different genetic origins (KCNA, KCNB, and KCNQ) and physiological roles.

Other names

Shaker-related potassium channels (Kv1)Shab-related potassium channels (Kv2)KCNQ channels (Kv7)Voltage-gated potassium channel subfamilies A, B, and Q

Drugs targeting these channels typically act as either pore blockers to prolong action potentials (e.g., Kv1 blockers like 4-aminopyridine) or positive allosteric modulators/openers to stabilize the resting membrane potential and reduce neuronal firing (e.g., Kv7 openers like retigabine).