Glycogen storage disease type III
GSD type III is also known as Forbes-Cori disease or limit dextrinosis. In contrast to GSD type I, liver and skeletal muscles are involved in GSD type III. Glycogen deposited in these organs has an abnormal structure. Differentiating patients with GSD type III from those with GSD type I solely on the basis of physical findings is not easy.
Glycogen storage disease type IV
GSD type IV, also known as amylopectinosis or Andersen disease, is a rare disease that leads to early death. In 1956, Andersen reported the first patient with progressive hepatosplenomegaly and accumulation of abnormal polysaccharides. The main clinical features are liver insufficiency and abnormalities of the heart and nervous system.
Glycogen storage disease type V
GSD type V, also known as McArdle disease, affects the skeletal muscles. McArdle[4] reported the first patient in 1951. Initial signs of the disease usually develop in adolescents or adults. Muscle phosphorylase deficiency adversely affecting the glycolytic pathway in skeletal musculature causes GSD type V. Like other forms of GSD, McArdle disease is heterogeneous.
Glycogen storage disease type VI
GSD type VI, also known as Hers disease, belongs to the group of hepatic glycogenoses and represents a heterogenous disease. Hepatic phosphorylase deficiency or deficiency of other enzymes that form a cascade necessary for liver phosphorylase activation cause the disease.[5] In 1959, Hers described the first patients with proven phosphorylase deficiency.
Glycogen storage disease type VII
GSD type VII, also known as Tarui disease, arises as a result of phosphofructokinase (PFK) deficiency. The enzyme is located in skeletal muscles and erythrocytes. Tarui[6] reported the first patients in 1965. The clinical and laboratory features are similar to those of GSD type V.