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IgG N-Glycosylation Galactose Incorporation Ratios for the Monitoring of Classical Galactosaemia

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JIMD Reports, Volume 27

Abstract

Classical galactosaemia (OMIM #230400) is a rare disorder of carbohydrate metabolism caused by deficiency of the galactose-1-phosphate uridyltransferase enzyme (EC 2.7.7.12). The cause of the long-term complications, including neurological, cognitive and fertility problems in females, remains poorly understood. The relatively small number of patients with galactosaemia and the lack of validated biomarkers pose a substantial challenge for determining prognosis and monitoring disease progression and responses to new therapies. We report an improved method of automated robotic hydrophilic interaction ultra-performance liquid chromatography N-glycan analysis for the measurement of IgG N-glycan galactose incorporation ratios applied to the monitoring of adult patients with classical galactosaemia. We analysed 40 affected adult patients and 81 matched healthy controls. Significant differences were noted between the G0/G1 and G0/G2 incorporation ratios between galactosaemia patients and controls (p < 0.001 and <0.01, respectively). Our data indicate that the use of IgG N-glycosylation galactose incorporation analysis may be now applicable for monitoring patient dietary compliance, determining prognosis and the evaluation of potential new therapies.

Competing interests: None declared

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Abbreviations

G0:

Agalactosylated

G1:

Monogalactosylated

G2:

Digalactosylated

Gal-1-P:

Galactose-1-phosphate

GALT:

Galactose-1-phosphate uridyltransferase

HILIC-UPLC:

Hydrophilic interaction ultra-performance liquid chromatography

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Acknowledgements

Funding for these studies was granted by the Irish Medical Research Charities Group (CFFH/TSCUH)/Health Research Board (No 2) was supported by the EU FP7 Research Framework Program ‘HighGlycan’ (Grant Reference No. 278535).

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Correspondence to Eileen P. Treacy .

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Communicated by: Jaak Jaeken

Appendices

Synopsis

The use of IgG N-glycosylation galactose incorporation analysis by HILIC-UPLC analysis can be applied for monitoring of optimum metabolic control for individuals with classical galactosaemia.

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Conflict of Interest

The authors, Henning Stockmann, Karen P. Coss, M. Estela Rubio-Gozalbo, Ina Knerr, Maria Fitzgibbon, Ashwini Maratha, James Wilson, Pauline Rudd and Eileen P. Treacy, declare that they have no conflict of interest.

All procedures regarding the galactosaemia patient studies and sampling were followed in accordance with the ethical standards of the responsible committee on human experimentation (institutional and national) and with the Helsinki Declaration of 1975, as revised in 2000. Informed consent was obtained from all patients for being included in the study.

All authors listed above have been involved in the conception or design of this study and in drafting/revising the submitted article. Henning Stockmann and Karen Coss were involved in the direct planning and conduct of the study and experiments. The other authors were involved in interpreting the results, drafting and revising the manuscript.

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Stockmann, H. et al. (2015). IgG N-Glycosylation Galactose Incorporation Ratios for the Monitoring of Classical Galactosaemia. In: Morava, E., Baumgartner, M., Patterson, M., Rahman, S., Zschocke, J., Peters, V. (eds) JIMD Reports, Volume 27. JIMD Reports, vol 27. Springer, Berlin, Heidelberg. https://doi.org/10.1007/8904_2015_490

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  • DOI: https://doi.org/10.1007/8904_2015_490

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  • Print ISBN: 978-3-662-50408-6

  • Online ISBN: 978-3-662-50409-3

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