Preferred Label : Mucopolysaccharidosis, type VII;
Symbol : MPS7;
CISMeF acronym : MPS7;
Type : Phenotype, molecular basis known;
Alternative titles and symbols : Beta-glucuronidase deficiency; Gusb deficiency; Sly syndrome; Mps VII;
Description : Mucopolysaccharidosis type VII is an autosomal recessive lysosomal storage disease
characterized by the inability to degrade glucuronic acid-containing glycosaminoglycans.
The phenotype is highly variable, ranging from severe lethal hydrops fetalis to mild
forms with survival into adulthood. Most patients with the intermediate phenotype
show hepatomegaly, skeletal anomalies, coarse facies, and variable degrees of mental
impairment (Shipley et al., 1993). MPS VII was the first autosomal mucopolysaccharidosis
for which chromosomal assignment was achieved.;
Inheritance : Autosomal recessive;
Molecular basis : Caused by mutation in the beta-glucuronidase gene (GUSB, 611499.0001);
Laboratory abnormalities : Beta-glucuronidase deficiency in fibroblasts and leukocytes; Dermatan and heparan sulfate excretion in urine; Coarse metachromatic granules in white blood cells; Chondroitin 4-, 6-sulfate excretion in urine;