Canadian Medical Guide > Diseases > Congenital, Hereditary, and Neonatal Diseases and Abnormalities > Genetic Diseases, Inborn > Metabolism, Inborn Errors > Carbohydrate Metabolism, Inborn Errors > Mucopolysaccharidoses Terms and Definitions




Mucopolysaccharidoses

Medical Definition: Group of lysosomal storage diseases each caused by an inherited deficiency of an enzyme involved in the degradation of glycosaminoglycans (mucopolysaccharides). The diseases are progressive and often display a wide spectrum of clinical severity within one enzyme deficiency.
Guide Notes: lysosomal storage dis; types I through VII except V are available as main headings: V = MUCOPOLYSACCHARIDOSIS V see MUCOPOLYSACCHARIDOSIS I; do not use /congen & do not coord with INFANT, NEWBORN, DISEASES
Mucopolysaccharidoses Categories.
Canadian Medical Guide Definition Mucopolysaccharidosis I - Systemic lysosomal storage disease caused by a deficiency of alpha-L-iduronidase (IDURONIDASE) and characterized by progressive physical deterioration with urinary excretion of dermatan sulfate and heparan sulfate. There are three recognized phenotypes representing a spectrum of clinical severity from severe to mild: Hurler's syndrome, Hurler-Scheie syndrome and Scheie's syndrome (formerly mucopolysaccharidosis V). Symptoms may include dwarfism, hepatosplenomegaly, gargoyle-like facies, corneal clouding, cardiac complications, and noisy breathing. Hunter syndrome (MUCOPOLYSACCHARIDOSIS II) and Hurler syndrome were each originally called "gargoylism" because of the coarsness of the facial features of affected individuals.
Canadian Medical Guide Definition Mucopolysaccharidosis III - Mucopolysaccharidosis characterized by heparitin sulfate in the urine, progressive mental retardation, mild dwarfism, and other skeletal disorders. There are four clinically indistinguishable but biochemically distinct forms, each due to a deficiency of a different enzyme.
Canadian Medical Guide Definition Mucopolysaccharidosis IV - Genetic disorder of mucopolysaccharide metabolism characterized by skeletal abnormalities, joint instability, development of cervical myelopathy, and excessive urinary keratan sulfate. There are two biochemically distinct forms, each due to a deficiency of a different enzyme.
Canadian Medical Guide Definition Mucopolysaccharidosis VI - Mucopolysaccharidosis with excessive chondroitin sulfate B in urine, characterized by dwarfism and deafness. It is caused by a deficiency of N-acetylgalactosamine-4-sulfatase (arylsulfatase B).
Canadian Medical Guide Definition Mucopolysaccharidosis VII - Mucopolysaccharidosis characterized by excessive dermatan and heparan sulfates in the urine and Hurler-like features. It is caused by a deficiency of beta-glucuronidase.

Mucopolysaccharidoses Medical Definitions and Terms

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