KCNMB2 encodes a regulatory beta subunit of calcium-activated potassium channels (BK channels) that modulates channel function and neuronal excitability. The protein acts as a negative regulator that confers rapid inactivation to KCNMA1 channel complexes and alters activation/deactivation kinetics 1. KCNMB2 is expressed in central neurons including hippocampal CA1 neurons and chr3 cells, where it contributes to BK channel diversity through tissue-specific modulation. Functionally significant variants in KCNMB2 have been associated with multiple pathological conditions. Genetic studies identified KCNMB2 as a risk gene for limbic-predominant age-related TDP-43 encephalopathy (LATE) and hippocampal sclerosis of aging 23, with gene-based associations confirmed in large autopsy cohorts. Additionally, KCNMB2 polymorphisms influence ritodrine therapy outcomes in preterm labor, affecting both drug efficacy and adverse events 4. An autism-associated G124R mutation in the extracellular loop alters BK channel activation and deactivation kinetics, though its pathogenicity requires further validation 1. KCNMB2 expression changes are also implicated in COPD progression in response to cigarette smoking 5. These findings highlight KCNMB2's critical role in neuronal function and its involvement in age-related neurodegeneration and other pathological processes.