Abstract
Mucopolysaccharidosis type VI (MPS VI) is a progressive, autosomal, recessive lysosomal disorder. This disorder, due to a deficiency in N-acetylgalactosamine-4-sulfatase (ASB), results in an accumulation of glycosaminoglycan (GAG), causing multiple organ failures. In this study, monochorionic biamniotic twins with the severe form of MPS VI underwent enzyme replacement therapy (ERT) with weekly infusions of recombinant human ASB (galsulfase) at 1 mg/kg. After 9 years of ERT, a comprehensive clinical examination was performed. Several types of biochemical, immunological, and genetic investigations were also conducted. Both twins showed the typical symptoms and signs of MPS VI at baseline, including short stature, progressive dysmorphic facial features, and dysostosis multiplex. Twin 2 presented stronger multisystemic involvement, with marked musculoskeletal, neurological, and odontological components. She also developed an ischemic spinal cord lesion after surgery, which is the first case described in the literature in Maroteaux–Lamy syndrome. However, the extent of disease was found to be equally stabilized in the two sisters, concretely the cardiac and respiratory functions and body length. The early diagnosis and treatment of MPS VI are critical for an optimal clinical outcome, and further evidence for the new treatment strategies is needed.
Competing interests: None declared
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Acknowledgments
Scientific editorial assistance was provided by Irantzu Izco-Basurko and Fernando Rico-Villademoros (Cociente S.L.). The authors thank the family for their collaboration.
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Communicated by: Olaf Bodamer, MD PhD
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Synopsis
Comprehensive description of clinical manifestations in monochorionic biamniotic twins with the severe form of mucopolysaccharidosis type VI under enzyme replacement therapy.
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MP analyzed data and drafted the manuscript. MO, GGF, and AF treated and followed up the patients and revised the manuscript. MJC conducted metabolic and genetic studies and revised the manuscript. All authors read and approved the manuscript.
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Mercedes Pineda Marfa.
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The authors RU, AF, MJC, and LG have no affiliations or financial involvement with any organization or entity with an interest in or conflict with the subject matter discussed in the manuscript. MO has received consulting fees or honoraria from Actelion Pharmaceuticals Ltd for travel, accommodations, or meetings and payment for lectures from BioMarin, Genzyme, and Shire. MP has received consulting fees or honoraria and payment for lectures from Actelion Pharmaceuticals Ltd and BioMarin.
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Informed consent was obtained from the parents of the patients before retrieving the data for the study.
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Pineda, M., O’Callaghan, M., Fernandez Lopez, A., Coll, M.J., Ullot, R., Garcia-Fructuoso, G. (2016). Clinical Evolution After Enzyme Replacement Therapy in Twins with the Severe Form of Maroteaux–Lamy Syndrome. In: Morava, E., Baumgartner, M., Patterson, M., Rahman, S., Zschocke, J., Peters, V. (eds) JIMD Reports, Volume 30. JIMD Reports, vol 30. Springer, Berlin, Heidelberg. https://doi.org/10.1007/8904_2016_530
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DOI: https://doi.org/10.1007/8904_2016_530
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