Mass spectrometry for congenital disorders of glycosylation, CDG

Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
Yoshinao Wada

Abstract

Congenital disorders of glycosylation (CDG) constitute a group of diseases affecting N-linked glycosylation pathways. The classical type of CDG, now called CDG-I, results from deficiencies in the early glycosylation pathway for biosynthesis of lipid-linked oligosaccharide and its transfer to proteins in endoplasmic reticulum, while the CDG-II diseases are caused by defects in the subsequent processing steps. Mass spectrometry (MS) produced a milestone in CDG research, by localizing the CDG-I defect to the early glycosylation pathway in 1992. Currently, MS of transferrin, either by electrospray ionization or matrix-assisted laser desorption/ionization, plays the central role in laboratory screening of CDG-I. On the other hand, the glycopeptide analysis recently developed for site-specific glycans of glycoproteins allows detailed glycan analysis in a high throughput manner and will solve problems in CDG-II diagnosis. These techniques will facilitate studying CDG, a field now expanding to O-linked glycosylation and to acquired as well as inherited conditions that can affect protein glycosylation.

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Citations

Mar 25, 2011·Journal of Inherited Metabolic Disease·Mailys GuillardDirk J Lefeber
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