KCNG4 (Kv6.4) is a regulatory subunit of voltage-gated potassium channels that does not form functional channels independently 1. When coassembled with KCNB1 (Kv2.1), KCNG4 modulates heterotetrameric channel kinetics by reducing deactivation rate, shifting activation threshold approximately 20 mV toward hyperpolarization, shifting inactivation voltage dependence ~40 mV hyperpolarically, and accelerating activation 12. In neurons, Kv2/KCNG4 heteromers predominate in dorsal root ganglion neurons, distinguishable pharmacologically from Kv2-only channels 34. Clinically, KCNG4 variants associate with pain perception and migraine. A rare missense variant (Met419) in KCNG4 exhibits dominant-negative effects, failing to traffic to the plasma membrane and preventing modulation of Kv2.1 inactivation 5. This variant increases action potential threshold in uterine nociceptors and correlates with reduced labor pain sensitivity 5. The Kv6.4-L360P variant linked to migraine nearly abolishes Kv2 currents, potentially disrupting trigeminal neuron signaling 6. KCNG4 variants have also been identified in migraine screening studies 7 and familial multiple sclerosis 8, suggesting broader neurological involvement. Downregulation of Kcng4 occurs in latent Toxoplasma infection models 9.