Pancreatic β cells secrete insulin in response to postprandial increases in glucose levels to prevent hyperglycemia and inhibit insulin secretion under fasting conditions to protect against hypoglycemia. β cells lack this functional capability at birth and acquire glucose-stimulated insulin secretion (GSIS) during neonatal life. Here, we have shown that during postnatal life, the de novo DNA methyltransferase DNMT3A initiates a metabolic program by repressing key genes, thereby enabling the coupling of insulin secretion to glucose levels. In a murine model, β cell–specific deletion of
Sangeeta Dhawan, Shuen-Ing Tschen, Chun Zeng, Tingxia Guo, Matthias Hebrok, Aleksey Matveyenko, Anil Bhushan
DNA methylation directs metabolic programming during β cell maturation.