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Condition

Mucopolysaccharidosis Type 3B

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Condition 101

What is the definition of Mucopolysaccharidosis Type 3B?

Mucopolysaccharidosis type IIIB (MPS IIIB) is an genetic disorder that makes the body unable to break down large sugar molecules called glycosaminoglycans (GAGs, formerly called mucopolysaccharides). Specifically, people with this condition are unable to break down a GAG called heparan sulfate. Affected individuals can have severe neurological symptoms, including progressive dementia, aggressive behavior, hyperactivity, seizures, deafness, loss of vision, and an inability to sleep for more than a few hours at a time. MPS IIIB is caused by alterations (mutations) in the NAGLU gene. This gene provides the instructions for producing an enzyme called N-alpha-acetylglucosaminidase, which is needed to completely break down heparan sulfate. MPS IIIB is inherited in an autosomal recessive manner. There is no specific treatment for this condition. Most people with MPS IIIB live into their teenage years, and some live longer.

What are the alternative names for Mucopolysaccharidosis Type 3B?

  • Mucopoly-saccharidosis type 3B
  • Sanfilippo syndrome B
  • N-acetyl-alpha-d-glucosaminidase deficiency
  • MPS IIIB
  • MPS 3B