Fast screening of N-glycosylation disorders by sialotransferrin profiling with capillary zone electrophoresis

Kingma, H. A., van der Sluijs, F. H. & Heiner-Fokkema, M. R., Nov-2018, In : Annals of Clinical Biochemistry. 55, 6, p. 693-701 9 p.

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Background Congenital disorders of glycosylation (CDG) are a growing group of rare genetic disorders. The most frequently used screening method is sialotransferrin profiling using isoelectric focusing (IEF). Capillary zone electrophoresis (CZE) may be a simple and fast alternative. We investigated the Capillarys CDT assay (Sebia, France) to screen for N-glycosylation disorders, using IEF as gold standard.

Methods Intra- and inter-assay precision were established, and analyses in heparin-anticoagulated plasma and serum were compared. Accuracy was assessed by comparing IEF and CZE profiles of 153 samples, including 49 normal, 53 CDG type I, 2 CDG type II, 1 combined CDG type I and type II and 48 samples with a Tf-polymorphism. Neuraminidase-treated plasma was analysed to discriminate CDG and Tf-polymorphisms using samples of 52 subjects (25 had a confirmed Tf-polymorphism). Age-dependent reference values were established using profiles of 312 samples.

Results Heparin-plasma is as suitable as serum for CDG screening with the Capillarys CDT assay. The precision of the method is high, with a limit of quantification (LOQ) of 0.5%. All profiles, including CDG and Tf-polymorphisms, were correctly identified with CZE. Forty-nine of 52 neuraminidase-treated samples correctly identified the presence/absence of a Tf-polymorphism. Interferences in 3/52 samples hampered interpretation. Sialo-Tf profiles were dependent of age, in particular in the first three months of age.

Conclusions CZE analysis with the Capillarys CDT kit (Sebia) is a fast and reliable method for screening of N-glycosylation defects. Tf-polymorphisms could be excluded after overnight incubation with neuraminidase.

Original languageEnglish
Pages (from-to)693-701
Number of pages9
JournalAnnals of Clinical Biochemistry
Issue number6
Publication statusPublished - Nov-2018


  • Congenital disorders of glycosylation, sialotransferrin, transferrin polymorphisms, neuraminidase, capillary zone electrophoresis, DEFICIENT GLYCOPROTEIN SYNDROME, CONGENITAL DISORDERS, TRANSFERRIN ISOFORMS, SERUM TRANSFERRIN, DIAGNOSIS, ASSAY, CDT

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