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SHR Neuro Krebs Kardio Lipid Stoffw Microb

Verheyen, S; Blatterer, J; Speicher, MR; Bhavani, GS; Boons, GJ; Ilse, MB; Andrae, D; Sproß, J; Vaz, FM; Kircher, SG; Posch-Pertl, L; Baumgartner, D; Lübke, T; Shah, H; Al, Kaissi, A; Girisha, KM; Plecko, B.
Novel subtype of mucopolysaccharidosis caused by arylsulfatase K (ARSK) deficiency.
J Med Genet. 2022; 59(10):957-964 Doi: 10.1136/jmedgenet-2021-108061 [OPEN ACCESS]
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Führende Autor*innen der Med Uni Graz
Plecko Barbara
Verheyen Sarah
Co-Autor*innen der Med Uni Graz
Baumgartner Daniela
Blatterer Jasmin
Posch-Pertl Laura
Speicher Michael

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BACKGROUND: Mucopolysaccharidoses (MPS) are monogenic metabolic disorders that significantly affect the skeleton. Eleven enzyme defects in the lysosomal degradation of glycosaminoglycans (GAGs) have been assigned to the known MPS subtypes (I-IX). Arylsulfatase K (ARSK) is a recently characterised lysosomal hydrolase involved in GAG degradation that removes the 2-O-sulfate group from 2-sulfoglucuronate. Knockout of Arsk in mice was consistent with mild storage pathology, but no human phenotype has yet been described. METHODS: In this study, we report four affected individuals of two unrelated consanguineous families with homozygous variants c.250C>T, p.(Arg84Cys) and c.560T>A, p.(Leu187Ter) in ARSK, respectively. Functional consequences of the two ARSK variants were assessed by mutation-specific ARSK constructs derived by site-directed mutagenesis, which were ectopically expressed in HT1080 cells. Urinary GAG excretion was analysed by dimethylene blue and electrophoresis, as well as liquid chromatography/mass spectrometry (LC-MS)/MS analysis. RESULTS: The phenotypes of the affected individuals include MPS features, such as short stature, coarse facial features and dysostosis multiplex. Reverse phenotyping in two of the four individuals revealed additional cardiac and ophthalmological abnormalities. Mild elevation of dermatan sulfate was detected in the two subjects investigated by LC-MS/MS. Human HT1080 cells expressing the ARSK-Leu187Ter construct exhibited absent protein levels by western blot, and cells with the ARSK-Arg84Cys construct showed markedly reduced enzyme activity in an ARSK-specific enzymatic assay against 2-O-sulfoglucuronate-containing disaccharides as analysed by C18-reversed-phase chromatography followed by MS. CONCLUSION: Our work provides a detailed clinical and molecular characterisation of a novel subtype of mucopolysaccharidosis, which we suggest to designate subtype X.
Find related publications in this database (using NLM MeSH Indexing)
Animals - administration & dosage
Arylsulfatases - administration & dosage
Chromatography, Liquid - methods
Dermatan Sulfate - administration & dosage
Disaccharides - analysis
Glycosaminoglycans - genetics, metabolism
Humans - administration & dosage
Mice - administration & dosage
Mice, Knockout - administration & dosage
Mucopolysaccharidoses - administration & dosage
Sulfates - administration & dosage
Tandem Mass Spectrometry - methods

Find related publications in this database (Keywords)
human genetics
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