<unk>  is a disease characterized by a deficiency in the glycogen synthase enzyme (GSY). Although glycogen synthase deficiency does not result in<unk>  of extra glycogen in the liver, it is often classified as a glycogen<unk>  disease because it is another defect of glycogen<unk>  and can cause similar problems. There are two isoforms (types) of glycogen synthase enzyme; GSY1 in muscle and GSY2 in liver, each with a corresponding form of the disease. Mutations in the liver isoform (GSY2), causes fasting hypoglycemia, high blood ketones, increased free fatty acids and low levels of alanine and lactate. Conversely, feeding in these patients results in hyperglycemia and hyperlactatemia..
Glycogen storage disease type 0
Glycogen storage disease type III
Glycogen storage disease type I
Glycogen storage disease type II
Glycogen storage disease type IV
Glycogen storage disease type V
Glycogen storage disease type VI
Glycogen storage disease type IX