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MPS VII

Sly Syndrome

What is MPS VII?

MPS VII is a mucopolysaccharide disease also known as Sly syndrome. It takes its name from Dr. William Sly who originally described the condition in 1972.

What Causes This Disease?

Mucopolysaccharides are chains of sugar molecules used to build connective tissues in the body.

“muco” refers to the thick jelly-like consistency of the molecules

“poly” means many

“saccharide” is a general term for a sugar molecule

The body constantly replaces used materials and breaks them down for disposal. Patients with MPS VII are missing the enzyme beta-glucuronidase, which is essential to breaking down the mucopolysaccharides heparan sulfate, chondroitin 4-, 6-sulfates, and dermatan sulfate. These materials remain stored in the body’s cells, causing progressive damage. Babies may show little sign of the disease, but as cells sustain damage, symptoms start to appear.

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Frequently Asked Questions

MPS VII is estimated to occur in 1 in 250,000 newborns. It is one of the rarest types of mucopolysaccharidosis.

MPS VII is caused by a recessive gene. There is a one in four chance with every pregnancy that the child will inherit the defective gene from each carrier parent and will be affected with the disease. There is a two in three chance that unaffected brothers and sisters of Sly patients will be carriers.

There is no cure for MPS VII, but as of Nov. 15, 2017, the U.S. Food and Drug Administration has approved Mepsevii, vestronidase alfa, as an enzyme replacement therapy for MPS VII.

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