Cantú syndrome

Cantú syndrome, also known as hypertrichosis-osteochondrodysplasia-cardiomegaly syndrome, is a rare genetic disorder caused by gain-of-function mutations in the ABCC9 gene (encoding the SUR2 subunit of ATP-sensitive potassium channels) or, less commonly, in the KCNJ8 gene (encoding the Kir6.1 subunit). These mutations lead to excessive opening of KATP channels, which affects multiple organ systems throughout the body. The hallmark features of Cantú syndrome include congenital hypertrichosis (excessive hair growth over the entire body, present from birth), distinctive facial features (coarse face, broad nasal bridge, epicanthal folds, full lips, and macroglossia), and cardiovascular abnormalities. Cardiac manifestations are particularly significant and include cardiomegaly, patent ductus arteriosus, pericardial effusion, pulmonary hypertension, and dilated and tortuous blood vessels. Skeletal anomalies such as thickened calvarium, broad ribs, platyspondyly, and widened metaphyses may also be present. Additional features can include macrosomia at birth, edema (particularly lymphedema), and mild to moderate developmental delay in some individuals. Management of Cantú syndrome is primarily symptomatic and multidisciplinary, involving cardiology, dermatology, and orthopedic specialists. Cardiovascular complications require close monitoring and may necessitate surgical intervention, particularly for patent ductus arteriosus or significant pericardial effusions. Minoxidil-like effects of the underlying molecular defect have prompted investigation into KATP channel inhibitors such as glibenclamide (glyburide) as a potential targeted therapy, with clinical trials ongoing. Cosmetic management of hypertrichosis may include hair removal techniques. Prognosis depends largely on the severity of cardiovascular involvement, and lifelong cardiac surveillance is recommended.

Common questions about Cantú syndrome