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Biochemical, Immunological, and Cell Genetic Studies in Glycogenosis Type II

Overview
Journal Am J Hum Genet
Publisher Cell Press
Specialty Genetics
Date 1978 Mar 1
PMID 350041
Citations 29
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Abstract

Fibroblasts from patients with the adult, juvenile, and infantile form of glycogenosis type II (Pompe disease) were cultured under standardized conditions, and the activity of acid alpha-glucosidase (E.C.3.2.1.20) towards glycogen, maltose, and 4-methylumbelliferyl-alpha-D-glucopyranoside was measured. Glycogen levels in muscle biopsies and in cultured fibroblasts from patients were determined. Residual enzyme activities varying from 7%-22% were detected in fibroblasts from patients with the adult form but not from patients with the infantile form of glycogenosis II. An inverse correlation was found between the severity of the clinical manifestation and the degree of residual enzyme activity in the fibroblasts. The kinetic and electrophoretic properties of acid alpha-glucosidase in fibroblasts from the adult patients and from control individuals were similar. Immunological studies suggested that the decrease of acid alpha-glucosidase activity is caused by a mutation that affects the production or degradation of the enzyme rather than its catalytic activity. Complementation studies were carried out by fusing fibroblasts from patients with the adult, juvenile, and infantile form of glycogenosis II, but neither conventional assays on multikaryons nor enzyme assays on single binuclear heterokaryons gave any evidence for genetic heterogeneity among these forms.

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