Deficiencies in subunits of the Conserved Oligomeric Golgi (COG) complex define a novel group of Congenital Disorders of Glycosylation.
Processing of the glycan structures on glycoproteins by different glycosylation enzymes depends on, among other, the non-uniform distribution of these enzymes within the Golgi stacks. This compartmentalization is achieved by a balance between anterograde and retrograde vesicular trafficking. If the balance is disturbed, the glycosylation machinery is mislocalized, which can cause Congenital Disorders of Glycosylation type II (CDG-II), as illustrated by the identification of congenital defects in the Conserved Oligomeric Golgi (COG) complex in humans. We collected findings from different COG deficient cell types, such as CHO, yeast and human fibroblasts to hypothesize about structure and function of the COG complex, and compared the phenotypes and genotypes of the patients known with a COG deficiency. Among 35 CDG-II patients we found 5 patients with a COG defect. COG defects are a novel group of CDG-II with deficient N- as well as O-glycosylation.
Zeevaert
Renate
R
Center for Human Genetics, University Hospital Gasthuisberg, Herestraat 49, B3000 Leuven, Belgium.
Foulquier
François
F
Jaeken
Jaak
J
Matthijs
Gert
G
D033942:Adaptor Proteins, Vesicular Transport / Q000737:chemistry / Q000172:deficiency* / Q000235:genetics; D000818:Animals; D002239:Carbohydrate Metabolism, Inborn Errors / Q000209:etiology* / Q000235:genetics; D005838:Genotype; D006031:Glycosylation; D006801:Humans; D008954:Models, Biological; D010641:Phenotype; D021122:Protein Subunits / Q000172:deficiency / Q000235:genetics
D033942:Adaptor Proteins, Vesicular Transport; C486489:COG1 protein, human; C512294:COG7 protein, human; C522290:COG8 protein, human; D021122:Protein Subunits