Sanfilippo syndrome type C: Mutation spectrum in the heparan sulfate acetyl-CoA: α-glucosaminide N-acetyltransferase (HGSNAT) gene

Matthew Feldhammer, Stéphanie Durand, Lenka Mrázová, Renée Myriam Boucher, Rachel Laframboise, Robert Steinfeld, James E. Wraith, Helen Michelakakis, Otto P. Van Diggelen, Martin Hřebíček, Stanislav Kmoch, Alexey V. Pshezhetsky

    Research output: Contribution to journalArticlepeer-review

    Abstract

    Mucopolysaccharidosis (MPS) type IIIC or Sanfilippo syndrome type C is a rare autosomal recessive disorder caused by the deficiency of the lysosomal membrane enzyme, heparan sulfate acetyl-CoA (AcCoA): α-glucosaminide N-acetyltransferase (HGSNAT; EC 2.3.1.78), which catalyzes transmembrane acetylation of the terminal glucosamine residues of heparan sulfate prior to their hydrolysis by α-N-acetylglucosaminidase. Lysosomal storage of undegraded heparan sulfate in the cells of affected patients leads to neuronal death, causing neurodegeneration and severely impaired development accompanied by mild visceral and skeletal abnormalities, including mild dwarfism, coarse facies, and joint stiffness. To date, 50 HGSNAT mutations have been identified in MPS IIIC patients: 40 were previously published and 10 novel mutations are reported here. The mutations span the entire structure of the gene and include 13 splice-site mutations, 11 insertions and deletions, 8 nonsense mutations, and 18 missense mutations (http://chromium.liacs.nl/LOVD2/home.php? select-db5HGSNAT). In addition, four polymorphisms result in amino acid changes that do not affect activity of the enzyme. In this work we discuss the spectrum ofMPS IIIC mutations, their clinical presentation and distribution within the patient population, and speculate how the mutations may affect the structure and function of HGSNAT. © 2009 Wiley-Liss, Inc.
    Original languageEnglish
    Pages (from-to)918-925
    Number of pages7
    JournalHuman Mutation
    Volume30
    Issue number6
    DOIs
    Publication statusPublished - Jun 2009

    Keywords

    • Heparan sulfate
    • HGSNAT
    • Lysosome
    • MPS IIIC
    • Mucopolysaccharidosis
    • Mutation analysis
    • N-acetyltransferase
    • Sanfilippo syndrome type C

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