KCNB2 encodes the Kv2.2 voltage-gated potassium channel, which plays critical roles in neuronal excitability and cellular homeostasis. The channel mediates delayed-rectifier potassium currents that regulate action potential firing and membrane potential in neurons 1. KCNB2 functions as homotetrameric channels or forms heteromeric complexes with other potassium channel subunits, creating functionally diverse channel properties 2. In pancreatic β-cells, Kv2.2 channels regulate glucose-stimulated insulin secretion, with PGE2 inhibiting these channels through EP2/4 receptor-mediated PKA phosphorylation at residue S448 3. Pathogenic mutations in KCNB2 cause neurodevelopmental disorders including epilepsy, autism spectrum disorders, and intellectual disabilities by altering channel inactivation properties, leading to neuronal hyperexcitability 14. The channel also serves as a tumor maintenance gene in sonic hedgehog medulloblastoma, where it regulates cell volume and EGFR signaling in cancer-propagating cells 5. Additionally, KCNB2 genetic variants contribute to postoperative nausea and vomiting susceptibility 67. In bladder smooth muscle, KCNB2 expression is epigenetically regulated by EZH2 and influences cellular phenotype during obstruction-related pathology 8.