Context Neonatal diabetes is a rare disorder with an incidence of about 1 in 100,000 live births. It is defined as diabetesdiagnosed in the first 6 months of life and it is vital to differentiate this entity from type 1 diabetes to enable accuratediagnosis, prognosis, genetic counseling and treatment. Case report We describe a case of permanent neonatal diabetesmellitus due to a novel mutation affecting the ABCC8 gene that encodes the SUR1 subunit of potassium ATP channel (KATP).Conclusion This genetic diagnosis has therapeutic implications as patients can switch from insulin therapy to sulphonylurea,as described in this case report.
