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A congenital disorder of glycosylation (previously called carbohydrate-deficient glycoprotein syndrome) is one of several rare inborn errors of metabolism in which glycosylation of a variety of tissue proteins and/or lipids is deficient or defective.
2-methylbutyryl-coenzyme A dehydrogenase deficiency, 3-alpha-hydroxyacyl-CoA dehydrogenase deficiency, 3-Methylcrotonyl-CoA carboxylase deficiency, ACAD9 deficiency, Alpers' syndrome, Carbohydrate-deficient glycoprotein syndrome type 1b, Carnitine palmitoyltransferase I deficiency, Carnitine-acylcarnitine translocase deficiency, Cleft lip ...
[1] [3] [2] Other causes of hypoglycemia include severe illness, sepsis, kidney failure, liver disease, hormone deficiency, tumors such as insulinomas or non-B cell tumors, inborn errors of metabolism, and several medications. [1] [3] [2] Low blood sugar may occur in otherwise healthy newborns who have not eaten for a few hours. [8]
The two organs most commonly affected are the liver and the skeletal muscle. Glycogen storage diseases that affect the liver typically cause hepatomegaly and hypoglycemia; those that affect skeletal muscle cause exercise intolerance, progressive weakness and cramping. [1] Glucose-6-phosphate isomerase deficiency affects step 2 of glycolysis.
Traditionally the inherited metabolic diseases were classified as disorders of carbohydrate metabolism, amino acid metabolism, organic acid metabolism, or lysosomal storage diseases. [4] In recent decades, hundreds of new inherited disorders of metabolism have been discovered and the categories have proliferated.
Inherited metabolic disorders are one cause of metabolic disorders, and occur when a defective gene causes an enzyme deficiency. [6] These diseases, of which there are many subtypes, are known as inborn errors of metabolism. [7] Metabolic diseases can also occur when the liver or pancreas do not function properly. [3]
A glycogen storage disease (GSD, also glycogenosis and dextrinosis) is a metabolic disorder caused by a deficiency of an enzyme or transport protein affecting glycogen synthesis, glycogen breakdown, or glucose breakdown, typically in muscles and/or liver cells. [1] GSD has two classes of cause: genetic and environmental.
GSD Ia is caused by a deficiency in the enzyme glucose-6-phosphatase; GSD Ib, a deficiency in the transport protein glucose-6-phosphate translocase. Because glycogenolysis is the principal metabolic mechanism by which the liver supplies glucose to the body during fasting , both deficiencies cause severe hypoglycemia and, over time, excess ...