Sly syndrome
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| Sly syndrome Classification and external resources |
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| ICD-10 | E76.2 |
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| ICD-9 | 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 Sly in 1969. [1][2]
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[edit] Genetics
The defective gene responsible for Sly syndrome is located on chromosome 7.
[edit] Symptoms
The symptoms of Sly syndrome are similar to those of Hurler syndrome (MPS I). The symptoms include:
- in the head, neck, and face: coarse (Hurler-like) facies and macrocephaly, frontal prominence, premature closure of sagittal lambdoid sutures, and J-shaped sella turcica
- in the eyes: corneal opacity and iris colobmata
- in the nose: anteverted nostrils and a depressed nostril bridge
- in the mouth and oral areas: prominent alveolar processes and cleft palate
- in the thorax: usually pectus carinatum or exacavatum and oar-shaped ribs; also a protruding abdomen and inguinal or umbilical hernia
- in the extremities: talipes, an underdeveloped ilium, aseptic necrosis of femoral head, and shortness of tubular bones occurs
- in the spine: kyphosis or scoliosis and hook-like deformities in thoracic and lumbar vertebrate
- in the bones: dysotosis multiplex
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.
[edit] Prevalence
MPS type VII occurs in only 1:250,000 people.
[edit] Other names
Mucopolysaccahridosis Type VII is also known as β-glucurondinase deficiency, β-glucurondinase deficiency mucopolysaccahridosis, GUSB deficiency, mucopolysaccahride storage disease VII, MCA, and MR.
[edit] References
[edit] External links
- The Matthew Evangelista Foundation Inc. is a charity that is trying to raise money to find treatment for Sly syndrome.
- http://www.mpssociety.org/
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