TMEM199-CDG

A rare congenital disorder of glycosylation characterized by chronic, non-progressive liver disease, manifesting as mild steatosis with elevated serum transaminases and alkaline phosphatase, hypercholesterolemia, and decreased coagulation factors and ceruloplasmin. Transferrin glycosylation pattern is consistent with a type 2 congenital disorder of glycosylation. Liver biopsy may show mild non-progressive fibrosis. Patients usually remain asymptomatic, although delayed psychomotor development and hypotonia have been reported in single cases.