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  • Title: A novel disorder of N-glycosylation due to phosphomannose isomerase deficiency.
    Author: de Koning TJ, Dorland L, van Diggelen OP, Boonman AM, de Jong GJ, van Noort WL, De Schryver J, Duran M, van den Berg IE, Gerwig GJ, Berger R, Poll-The BT.
    Journal: Biochem Biophys Res Commun; 1998 Apr 07; 245(1):38-42. PubMed ID: 9535779.
    Abstract:
    Three siblings suffered from an unusual disorder of cyclic vomiting and congenital hepatic fibrosis. Serum transferrin isoelectric focusing showed increased asialo- and disialotransferrin isoforms as seen in the carbohydrate-deficient glycoprotein (CDG) syndrome type I. Phosphomannomutase, which is deficient in most patients with type I CDG syndrome, was found to be normal in all three patients. Structural analysis of serum transferrin revealed nonglycosylated, hypoglycosylated, and normoglycosylated transferrin molecules. These findings suggested a defect in the early glycosylation pathway. Phosphomannose isomerase was found to be deficient and the defect was present in leucocytes, fibroblasts, and liver tissue. Phosphomannose isomerase deficiency appears to be a novel glycosylation disorder, which is biochemically indistinguishable from CDG syndrome type I. However, the clinical presentation is entirely different.
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