ABCC8 encodes the sulfonylurea receptor 1 (SUR1) subunit of ATP-sensitive potassium (KATP) channels in pancreatic β-cells, playing a crucial role in glucose-stimulated insulin secretion 1. The protein functions as a regulatory subunit that partners with KCNJ11 to form functional KATP channels, where KCNJ11 forms the channel pore while ABCC8 enables activation and regulation 1. These channels are key components of the insulin secretion pathway, responding to cellular ATP levels to control insulin release 2. Pathogenic variants in ABCC8 cause diverse metabolic disorders with opposing phenotypes: inactivating mutations lead to oversecretion of insulin resulting in congenital hyperinsulinism, while activating mutations cause reduced insulin secretion and diabetes 1. The gene is associated with multiple diabetes subtypes including neonatal diabetes, MODY type 12, and hyperinsulinemic hypoglycemia 3. ABCC8 mutations represent the most common genetic cause of both neonatal diabetes and hyperinsulinism 1. Clinical management often involves sulfonylureas, which target the defective gene product, though treatment efficacy varies substantially depending on the specific mutation 3. The complexity of genotype-phenotype correlations in ABCC8-related disorders necessitates genetic testing for accurate diagnosis and appropriate therapeutic intervention 4.