TY - CHAP M1 - Book, Section TI - Congenital Disorders of Protein Glycosylation A1 - Jaeken, Jaak A2 - Kline, Mark W. Y1 - 2018 N1 - T2 - Rudolph's Pediatrics, 23e AB - Glycosylation is an important posttranslational protein modification occurring in the cytoplasm, the endoplasmic reticulum, and the Golgi apparatus. A rapidly growing family of genetic diseases is due to defects in protein and lipid glycosylation (congenital disorders of glycosylation [CDG]). Most CDGs are severe, multisystem diseases with prominent neurologic involvement. Nearly 100 CDGs have been identified. This chapter is limited to the protein glycosylation defects (some 80 disorders). Twenty-five CDGs are due to an N-glycosylation defect (Table 158-1). Twenty disorders have been identified in O-glycosylation, including some long-known diseases such as hereditary multiple exostoses (Table 158-2). Thirty-four disorders have a combined N- and O-glycosylation defect, including dolichol metabolism defects (Table 158-3). Important tools in the diagnosis are serum transferrin (Tf) isoelectric focusing (IEF), serum apolipoprotein C-III (apo C-III) isoelectrofocusing, protein-linked glycan analysis, and genetic analysis. In this text, we use the nomenclature introduced in 2009, namely the official gene symbol (not in italics) followed by “-CDG.” SN - PB - McGraw-Hill Education CY - New York, NY Y2 - 2024/04/20 UR - accesspediatrics.mhmedical.com/content.aspx?aid=1182929762 ER -