Glycogen storage disease 3
A metabolic disorder associated with an accumulation of abnormal glycogen with short outer chains. It is clinically characterized by hepatomegaly, hypoglycemia, short stature, and variable myopathy. Glycogen storage disease type 3 includes different forms: GSD type 3A patients lack glycogen debrancher enzyme activity in both liver and muscle, while GSD type 3B patients are enzyme-deficient in liver only. In rare cases, selective loss of only 1 of the 2 debranching activities, glucosidase or transferase, results in GSD type 3C or type 3D, respectively.
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