Sly syndrome

Sly syndrome
Classification and external resources
Specialty endocrinology
ICD-10 E76.2
ICD-9-CM 277.5
OMIM 253220
DiseasesDB 8389
eMedicine ped/858
MeSH D016538

Sly syndrome, also called Mucopolysaccharidosis Type VII or MPS, is an autosomal recessive lysosomal storage disease characterized by a deficiency of the enzyme β-glucuronidase, a lysosomal enzyme. Sly syndrome belongs to a group of disorders known as mucopolysaccharidoses, which are lysosomal storage diseases. In Sly syndrome, the deficiency in β-glucuronidase leads to the accumulation of certain complex carbohydrates (mucopolysaccharides) in many tissues and organs of the body.

It was named after its discoverer William S. Sly (1932-), an American Biochemist, in 1969 who has spent nearly his entire academic career at Saint Louis University.[1][2]


Sly syndrome has an autosomal recessive pattern of inheritance.

The defective gene responsible for Sly syndrome is located on chromosome 7.[3]


The symptoms of Sly syndrome are similar to those of Hurler syndrome (MPS I). The symptoms include:

In addition recurrent pulmonary infections occur. Hepatomegaly occurs in the gastrointestinal system. Splenomegaly occurs in the hematopoietic system. Inborn mucopolysaccharide metabolic disorders due to β-glucuronidase deficiency with granular inclusions in granulocytes occurs in the biochemical and metabolic systems. Growth and motor skills are affected, and mental retardation also occurs.


MPS type VII occurs in less than 1 in 250,000 births.[4]

Other names

Mucopolysaccharidosis Type VII is also known as β-glucuronidase deficiency, β-glucuronidase deficiency mucopolysaccharidosis, GUSB deficiency, mucopolysaccharide storage disease VII, MCA, and MR.


  1. "". Retrieved 2007-12-31.
  2. Sly WS, Quinton BA, McAlister WH, Rimoin DL (1973). "Beta glucuronidase deficiency: report of clinical, radiologic, and biochemical features of a new mucopolysaccharidosis". J. Pediatr. 82 (2): 249–57. doi:10.1016/S0022-3476(73)80162-3. PMID 4265197.
  3. Allanson, JE; Gemmill, RM; Hecht, BK; Johnsen, S; Wenger, DA (1988). "Deletion mapping of the beta-glucuronidase gene.". American Journal of Medical Genetics. 29 (3): 517–522. doi:10.1002/ajmg.1320290307. PMID 3376995.
  4. National Institute of Neurological Disorders and Stroke > Mucopolysaccharidoses Fact Sheet Last updated May 06, 2010
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