Yorifuji-Okuno syndrome Overview Yorifuji-Okuno syndrome (pancreatic hypoplasia-diabetes-congenital heart disease syndrome) is an extremely rare genetic disorder characterized by the triad of underdeveloped pancreas (pancreatic hypoplasia), neonatal/early-onset diabetes mellitus, and congenital heart defects. It is an autosomal dominant condition linked to GATA6 gene mutations, often causing severe, life-limiting health issues from infancy, though some cases may have varied severity. Symptoms Neonatal/Early-Onset Diabetes: Severe hyperglycemia and diabetes mellitus resulting from a lack of insulins. Pancreatic Hypoplasia/Agenesis: Underdevelopment or absence of the pancreas, leading to endocrine (insulin) and sometimes exocrine (digestive enzyme) insufficiency. Congenital Heart Defects: Common defects include ventricular or atrial septal defects, transposition of the great vessels, patent ductus arteriosus, and pulmonary stenosis. Other Potential Anomalies: Cases may include intraut...