Novel subtype of mucopolysaccharidosis caused by arylsulfatase K (ARSK) deficiency
Verheyen S, Blatterer J, Speicher MR, Bhavani GSL, Boons G-J, Ilse M-B, Andrae D, Sproß J, Vaz FM, Kircher SG, Posch-Pertl L, et al. (2021)
Journal of Medical Genetics: jmedgenet-2021-108061.
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| E-Veröff. vor dem Druck | Englisch
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Autor*in
Verheyen, Sarah;
Blatterer, Jasmin;
Speicher, Michael R;
Bhavani, Gandham SriLakshmi;
Boons, Geert-Jan;
Ilse, Mai-BrittUniBi;
Andrae, Dominik;
Sproß, JensUniBi;
Vaz, Frédéric Maxime;
Kircher, Susanne G;
Posch-Pertl, Laura;
Baumgartner, Daniela
Alle
Alle
Einrichtung
Abstract / Bemerkung
**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 ofArskin 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) inARSK, respectively. Functional consequences of the twoARSKvariants were assessed by mutation-specificARSKconstructs 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.
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 ofArskin 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) inARSK, respectively. Functional consequences of the twoARSKvariants were assessed by mutation-specificARSKconstructs 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.
Erscheinungsjahr
2021
Zeitschriftentitel
Journal of Medical Genetics
Art.-Nr.
jmedgenet-2021-108061
Urheberrecht / Lizenzen
ISSN
0022-2593
eISSN
1468-6244
Page URI
https://pub.uni-bielefeld.de/record/2960244
Zitieren
Verheyen S, Blatterer J, Speicher MR, et al. Novel subtype of mucopolysaccharidosis caused by arylsulfatase K (ARSK) deficiency. Journal of Medical Genetics. 2021: jmedgenet-2021-108061.
Verheyen, S., Blatterer, J., Speicher, M. R., Bhavani, G. S. L., Boons, G. - J., Ilse, M. - B., Andrae, D., et al. (2021). Novel subtype of mucopolysaccharidosis caused by arylsulfatase K (ARSK) deficiency. Journal of Medical Genetics, jmedgenet-2021-108061. https://doi.org/10.1136/jmedgenet-2021-108061
Verheyen, Sarah, Blatterer, Jasmin, Speicher, Michael R, Bhavani, Gandham SriLakshmi, Boons, Geert-Jan, Ilse, Mai-Britt, Andrae, Dominik, et al. 2021. “Novel subtype of mucopolysaccharidosis caused by arylsulfatase K (ARSK) deficiency”. Journal of Medical Genetics: jmedgenet-2021-108061.
Verheyen, S., Blatterer, J., Speicher, M. R., Bhavani, G. S. L., Boons, G. - J., Ilse, M. - B., Andrae, D., Sproß, J., Vaz, F. M., Kircher, S. G., et al. (2021). Novel subtype of mucopolysaccharidosis caused by arylsulfatase K (ARSK) deficiency. Journal of Medical Genetics:jmedgenet-2021-108061.
Verheyen, S., et al., 2021. Novel subtype of mucopolysaccharidosis caused by arylsulfatase K (ARSK) deficiency. Journal of Medical Genetics, : jmedgenet-2021-108061.
S. Verheyen, et al., “Novel subtype of mucopolysaccharidosis caused by arylsulfatase K (ARSK) deficiency”, Journal of Medical Genetics, 2021, : jmedgenet-2021-108061.
Verheyen, S., Blatterer, J., Speicher, M.R., Bhavani, G.S.L., Boons, G.-J., Ilse, M.-B., Andrae, D., Sproß, J., Vaz, F.M., Kircher, S.G., Posch-Pertl, L., Baumgartner, D., Lübke, T., Shah, H., Al Kaissi, A., Girisha, K.M., Plecko, B.: Novel subtype of mucopolysaccharidosis caused by arylsulfatase K (ARSK) deficiency. Journal of Medical Genetics. : jmedgenet-2021-108061 (2021).
Verheyen, Sarah, Blatterer, Jasmin, Speicher, Michael R, Bhavani, Gandham SriLakshmi, Boons, Geert-Jan, Ilse, Mai-Britt, Andrae, Dominik, Sproß, Jens, Vaz, Frédéric Maxime, Kircher, Susanne G, Posch-Pertl, Laura, Baumgartner, Daniela, Lübke, Torben, Shah, Hitesh, Al Kaissi, Ali, Girisha, Katta M, and Plecko, Barbara. “Novel subtype of mucopolysaccharidosis caused by arylsulfatase K (ARSK) deficiency”. Journal of Medical Genetics (2021): jmedgenet-2021-108061.
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