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Inherited metabolic disorders of glycoconjugate metabolism include congenital disorders of glycosylation (CDG) - disorders in biosynthesis of glycoconjugates; and some of the lysosomal storage diseases (LSD) - disorders of their degradation. This review summarizes the brief characteristics of metabolic pathways of synthesis and catabolism of glycoconjugates as well as the latest update of relevant enzymatic defects discovered in population. Every year the number of known subtypes of these disorders dramatically increases as a result of high-throughput analytical infrastructure applied. However, due to the broad spectrum of unspecific clinical symptoms, many patients remain undiagnosed or have wrong diagnosis with ineffective treatment. Thus, disorders of glycoconjugate metabolism should be considered and ruled out in any unexplained syndrome. The collaboration between scientists and physicians plays an important role in the progress of such personalized diagnostics, that is essential mainly for rare diseases. [ABSTRACT FROM AUTHOR]