PMID: 14578315Oct 28, 2003

Apolipoprotein C-III isofocusing in the diagnosis of genetic defects in O-glycan biosynthesis

Clinical Chemistry
Suzan WopereisRon A Wevers

Abstract

Defects in the biosynthesis of N-glycans may be found by isoelectric focusing (IEF) of plasma transferrin. No test is available to demonstrate O-glycan biosynthesis defects. We used isoforms of apolipoprotein C-III (apoC-III) as a marker for the biosynthesis of core 1 mucin type O-glycans. Plasma samples from patients with primary defects and secondary alterations in N-glycan biosynthesis were studied by apoC-III isofocusing. Age-related reference values for apoC-III were determined. Plasma samples from patients with the primary congenital disorders of glycosylation (CDG) types Ia-Ic, Ie, If, IIa, and IId all showed a normal apoC-III isofocusing profile. Plasma from two patients with CDG type IIx were tested: one showed a normal apoC-III distribution, whereas the other showed a hypoglycosylation profile. In plasma from patients with hemolytic uremic syndrome (HUS), a hypoglycosylation profile was obtained. IEF of apoC-III is a rapid and simple technique that may be used as a screening assay for abnormalities in core 1 mucin type O-glycans. Evidence that a patient in this study has a primary genetic defect affecting both N- and O-glycosylation provides the first example of an inborn error of metabolism affecting the biosynthesis...Continue Reading

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Related Concepts

Teens
Age Factors
Apoproteins C
Carbohydrate Metabolism, Inborn Errors
Protein Glycosylation
Isoelectric Focusing
Polysaccharides
Protein Isoforms
Apolipoprotein C-III-1

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