A novel conditional Sgsh knockout mouse model recapitulates phenotypic and neuropathic deficits of Sanfilippo syndrome

Adeline A. Lau, Barbara M. King, Carly L. Thorsen, Sofia Hassiotis, Helen Beard, Paul J. Trim, Lauren S. Whyte, Sarah J. Tamang, Stephen K. Duplock, Marten F. Snel, John J. Hopwood, Kim M. Hemsley

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)

Abstract

Mucopolysaccharidosis (MPS) type IIIA, or Sanfilippo syndrome, is a neurodegenerative lysosomal storage disorder caused by a deficiency of the lysosomal enzyme N-sulfoglucosamine sulfohydrolase (SGSH), involved in the catabolism of heparan sulfate. The clinical spectrum is broad and the age of symptom onset and the degree of preservation of cognitive and motor functions appears greatly influenced by genotype. To explore this further, we generated a conditional knockout (SgshKO) mouse model with ubiquitous Sgsh deletion, and compared the clinical and pathological phenotype with that of the spontaneous SgshD31N MPS-IIIA mouse model. Phenotypic deficits were noted in SgshKO mice prior to SgshD31N mice, however these outcomes did not correlate with any shift in the time of appearance nor rate of accumulation of primary (heparan sulfate) or secondary substrates (GM2/GM3 gangliosides). Other disease lesions (elevations in lysosomal integral membrane protein-II expression, reactive astrocytosis and appearance of ubiquitin-positive inclusions) were also comparable between affected mouse strains. This suggests that gross substrate storage and these neuropathological markers are neither primary determinants, nor good biomarkers/indicators of symptom generation, confirming similar observations made recently in MPS-IIIA patients. The SgshKO mouse will be a useful tool for elucidation of the neurological basis of disease and assessment of the clinical efficacy of new treatments for Sanfilippo syndrome.

Original languageEnglish
Pages (from-to)715-724
Number of pages10
JournalJOURNAL OF INHERITED METABOLIC DISEASE
Volume40
Issue number5
DOIs
Publication statusPublished - Sep 2017
Externally publishedYes

Keywords

  • Glial Fibrillary Acidic Protein
  • Heparan Sulfate
  • Mucopolysaccharidosis
  • Affected Mouse
  • Valstar

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