Clinical and biochemical presentation of siblings with COG-7 deficiency, a lethal multiple O- and N-glycosylation disorder.
until further notice
SourceJournal of Inherited Metabolic Disease, 28, 5, (2005), pp. 707-14
Article / Letter to editor
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Journal of Inherited Metabolic Disease
SubjectDCN 1: Perception and Action; DCN 2: Functional Neurogenomics; DCN 3: Neuroinformatics; IGMD 4: Glycostation disorders; NCMLS 4: Energy and redox metabolism; UMCN 3.1: Neuromuscular development and genetic disorders; UMCN 5.1: Genetic defects of metabolism
Congenital disorders of glycosylation (CDG) represent a group of inherited multiorgan diseases caused by defects in the biosynthesis of glycoproteins. We report on two dysmorphic siblings with severe liver disease who died at the age of a few weeks. Increased activities of lysosomal enzymes in plasma were found, though total sialic acid in plasma was strongly decreased. Isoelectric focusing of serum sialotransferrins showed a type 2-like CDG pattern. Some of the known CDG subtypes were excluded. O-Glycosylation was investigated by isoelectric focusing of apolipoprotein C-III, which showed increased fractions of hyposialylated isoforms. In a consecutive study a defect in the conserved oligomeric Golgi complex was established at the level of subunit COG-7, leading to disruption of multiple glycosylation functions of the Golgi. This report on patients with a new variant of CDG, due to a multiple Golgi defect, emphasizes in addition to sialotransferrins the importance of analysis of a serum O-linked glycoprotein, e.g. apolipoprotein C-III, in unclassified CDG-X cases.
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