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Glycobiology, 2000, Vol. 10, No. 12 1277-1281
© 2000 Oxford University Press

Defect in N-glycosylation of proteins is tissue-dependent in Congenital Disorders of Glycosylation Ia

Thierry Dupré1,2, Anne Barnier2, Pascale de Lonlay3, Valérie Cormier-Daire4, Geneviève Durand2,6, Patrice Codogno5 and Nathalie Seta2,7

2Biochimie A, Hôpital Bichat, 75877 Paris cedex 18, France, 3Service de Pédiatrie et maladies métaboliques, 4Service de Génétique Médicale, INSERM U393, Hôpital Necker, 75743 Paris cedex 15, France, 5INSERM U504, 94807 Villejuif cedex, France, 6Faculté de Pharmacie, Université Paris XI, 92260 Châtenay-Malabry cedex, France, and 7Faculté de Pharmacie, Université Paris V, 75270 Paris cedex 06, France

The biochemical hallmark of Congenital Disorders of Glycosylation (CDG) including type Ia is a defective N-glycosylation of serum glycoproteins. Hypoglycosylated forms of {alpha}1-antitrypsin have been detected by Western blot in serum from CDG Ia patients. In contrast we were not able to detect hypoglycosylation in {alpha}1-antitrypsin synthesized by fibroblasts, keratinocytes, enterocytes, and leukocytes. Similarly no hypoglycosylation was detectable in a membrane-associated N-linked glycoprotein, the facilitative glucose transporter GLUT-1 and also in serum immunoglobulin G isolated from sera of CDG Ia patients. We conclude that the phenotypic expression of CDG Ia is tissue-dependent.

1 To whom correspondence should be addressed at: Laboratoire de Biochimie A Hôpital Bichat–Claude Bernard, 46 rue H. Huchard, 75877 Paris cédex 18, France


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