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Genomic basis of mucopolysaccharidosis type IIID (MIM 252940) revealed by sequencing of GNS encoding N-acetylglucosamine-6-sulfatase
- Source :
- Genomics. 81(1)
- Publication Year :
- 2003
-
Abstract
- Mucopolysaccharidosis type IIID (MPS IIID; Sanfilippo syndrome type D; MIM 252940) is caused by deficiency of the activity of N-acetylglucosamine-6-sulfatase (GNS), which is normally required for degradation of heparan sulfate. The clinical features of MPS IIID include progressive neurodegeneration, with relatively mild somatic symptoms. Biochemical features include accumulation of heparan sulfate and N-acetylglucosamine-6-sulfate in the brain and viscera. To date, diagnosis required a specific lysosomal enzyme assay for GNS activity. From genomic DNA of a subject with MPS IIID, we amplified and sequenced the promoter and 14 exons of GNS. We found a homozygous nonsense mutation in exon 9 (1063C → T), which predicted premature termination of translation (R355X). We also identified two common synonymous coding single-nucleotide polymorphisms and genotyped these in samples from four ethnic groups. This first report of a mutation in GNS resulting in MPS IIID indicates the potential utility of molecular diagnosis for this rare condition.
- Subjects :
- Mucopolysaccharidosis Type IIID
Genetics
Mutation
Genome, Human
Mucopolysaccharidosis
Nonsense mutation
Sequence Analysis, DNA
Biology
medicine.disease_cause
medicine.disease
N-acetylglucosamine-6-sulfatase
Molecular biology
Polymorphism, Single Nucleotide
Exon
genomic DNA
Mucopolysaccharidosis III
medicine
Humans
Heparitin Sulfate
Sulfatases
Sanfilippo syndrome
Subjects
Details
- ISSN :
- 08887543
- Volume :
- 81
- Issue :
- 1
- Database :
- OpenAIRE
- Journal :
- Genomics
- Accession number :
- edsair.doi.dedup.....101fd6518fb16018d698299f345d4d60