Oral D-galactose supplementation in PGM1-CDG

Sunnie Yan Wai Wong, Therese Gadomski, Monique Van Scherpenzeel, Tomas Honzik, Hana Hansikova, Katja S.Brocke Holmefjord, Marit Mork, Francis Bowling, Jolanta Sykut-Cegielska, Dieter Koch, Jozef Hertecant, Graeme Preston, Jaak Jaeken, Nicole Peeters, Stefanie Perez, David Do Nguyen, Kea Crivelly, Tim Emmerzaal, K. Michael Gibson, Kimiyo RaymondNurulamin Abu Bakar, Francois Foulquier, Gernot Poschet, Amanda M. Ackermann, Miao He, Dirk J. Lefeber, Christian Thiel, Tamas Kozicz, Eva Morava

Research output: Contribution to journalArticle

23 Scopus citations

Abstract

PurposePhosphoglucomutase-1 deficiency is a subtype of congenital disorders of glycosylation (PGM1-CDG). Previous casereports in PGM1-CDG patients receiving oral D-galactose (D-gal) showed clinical improvement. So far no systematic in vitro and clinical studies have assessed safety and benefits of D-gal supplementation. In a prospective pilot study, we evaluated the effects of oral D-gal in nine patients.MethodsD-gal supplementation was increased to 1.5 g/kg/day (maximum 50 g/day) in three increments over 18 weeks. Laboratory studies were performed before and during treatment to monitor safety and effect on serum transferrin-glycosylation, coagulation, and liver and endocrine function. Additionally, the effect of D-gal on cellular glycosylation was characterized in vitro.ResultsEight patients were compliant with D-gal supplementation. No adverse effects were reported. Abnormal baseline results (alanine transaminase, aspartate transaminase, activated partial thromboplastin time) improved or normalized already using 1 g/kg/day D-gal. Antithrombin-III levels and transferrin-glycosylation showed significant improvement, and increase in galactosylation and whole glycan content. In vitro studies before treatment showed N-glycan hyposialylation, altered O-linked glycans, abnormal lipid-linked oligosaccharide profile, and abnormal nucleotide sugars in patient fibroblasts. Most cellular abnormalities improved or normalized following D-gal treatment. D-gal increased both UDP-Glc and UDP-Gal levels and improved lipid-linked oligosaccharide fractions in concert with improved glycosylation in PGM1-CDG.ConclusionOral D-gal supplementation is a safe and effective treatment for PGM1-CDG in this pilot study. Transferrin glycosylation and ATIII levels were useful trial end points. Larger, longer-duration trials are ongoing.

Original languageEnglish (US)
Pages (from-to)1226-1235
Number of pages10
JournalGenetics in Medicine
Volume19
Issue number11
DOIs
StatePublished - Nov 1 2017

Keywords

  • LLO
  • coagulation
  • glycomics
  • glycosylation
  • phosphoglucomutase 1

ASJC Scopus subject areas

  • Genetics(clinical)

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    Wong, S. Y. W., Gadomski, T., Van Scherpenzeel, M., Honzik, T., Hansikova, H., Holmefjord, K. S. B., Mork, M., Bowling, F., Sykut-Cegielska, J., Koch, D., Hertecant, J., Preston, G., Jaeken, J., Peeters, N., Perez, S., Nguyen, D. D., Crivelly, K., Emmerzaal, T., Gibson, K. M., ... Morava, E. (2017). Oral D-galactose supplementation in PGM1-CDG. Genetics in Medicine, 19(11), 1226-1235. https://doi.org/10.1038/gim.2017.41