SLC16A1 and ketoacidosis due to monocarboxylate transporter-1 deficiency: Abnormal expression or inactivation of MCT1 has been associated with a variety of diseases, including symptomatic deficiency in lactate transport (SDLT), hyperinsulinemic hypoglycemia familial 7 (HHF7), and monocarboxylate transporter 1 deficiency (MCT1D).