Frequency of most common causes of glycogen storage disease among 1438 patients from the United States and Europe

Type	Enzyme	Percent of total
Liver glycogenoses
Type I	Glucose-6-phosphatase system	25
Type III	Glycogen debrancher	24
Type VI and IX	Liver phosphorylase and phosphorylase b kinase	30
Type IV	Glycogen branching enzyme	3
Muscle glycogenoses
Type II	Acid maltase	15
Type V	Muscle phosphorylase	2
Type VII	Phosphofructokinase	<1

Data from Chen YT. Glycogen storage diseases. In: The Metabolic and Molecular Bases of Inherited Disease. Scriver CR, Beaudet AL, Sly WS, Valle D (Eds), 8th ed, McGraw-Hill, New York, 2001, p.1530.

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