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- W2017144627 abstract "Intestinal biopsy in a boy with gastroenteritis-induced protein-losing enteropathy (PLE) showed loss of heparan sulfate (HS. and syndecan-1 core protein from the basolateral surface of the enterocytes, which improved after PLE subsided. Isoelectric focusing analysis of serum transferrin indicated a congenital disorder of glycosylation (CDG) and subsequent analysis showed three point mutations in the <i>ALG6</i> gene encoding an α1,3-glucosyltransferase needed for the addition of the first glucose to the dolichol-linked oligosaccharide. The maternal mutation, C998T, causing an A333V substitution, has been shown to cause CDG-Ic, whereas the two paternal mutations, T391C (Y131H) and C924A (S308R) have not previously been reported. The mutations were tested for their ability to rescue faulty <i>N</i>-linked glycosylation of carboxypeptidase Y in an <i>ALG6</i>-deficient <i>Saccharomyces cerevisiae</i> strain. Normal human <i>ALG6</i> rescues glycosylation and A333V partially rescues, whereas the combined paternal mutations (Y131H and S308R) are ineffective. Underglycosylation resulting from each of these mutations is much more severe in rapidly dividing yeast. Similarly, incomplete protein glycosylation in the patient is most severe in rapidly dividing enterocytes during gastroenteritis-induced stress. Incomplete <i>N</i>-linked glycosylation of an HS core protein and/or other biosynthetic enzymes may explain the selective localized loss of HS and PLE." @default.
- W2017144627 created "2016-06-24" @default.
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- W2017144627 date "2000-12-01" @default.
- W2017144627 modified "2023-10-17" @default.
- W2017144627 title "Reduced Heparan Sulfate Accumulation in Enterocytes Contributes to Protein-Losing Enteropathy in a Congenital Disorder of Glycosylation" @default.
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- W2017144627 doi "https://doi.org/10.1016/s0002-9440(10)64830-4" @default.
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