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My watch list my.bionity.com   Login     Back to List |HomeEncyclopediaOrganic_acidemia Organic acidemia Organic acidemia, also called organic aciduria, is a term used to classify a group of metabolic disorders which disrupt normal amino acid metabolism, particularly branched-chain amino acids, causing a buildup of acids which are usually not present.[1] The four main types of organic acidemia are: methylmalonic acidemia, propionic acidemia, isovaleric acidemia, and maple syrup urine disease.[1] Contents 1 Terminology 2 Diagnosis and Symptoms 3 Cause 4 Treatment 5 References Terminology Organic acids refer to the amino acids and certain odd-chained fatty acids which are affected by these disorders. The branched-chain amino acids include isoleucine, leucine and valine.[1] Diagnosis and Symptoms Organic acidemias are usually always diagnosed in infancy, characterized by urinary excretion of abnormal amounts or types of organic acids. The diagnosis is usually made by detecting an abnormal pattern of organic acids in a urine sample by gas chromatography - mass spectrometry. In some conditions, the urine is always abnormal, in others the characteristic substances are only present intermittently. Many of the organic acidemias are detectable by newborn screening with tandem mass spectrometry.[2] These disorders vary in their prognosis, from manageable to fatal, and usually affect more than one organ system, especially the central nervous system. Neurological damage and developmental delay are common factors in diagnosis, with associated symptoms ranging from poor feeding to slow growth, lethargy, vomiting, dehydration, malnutrition, hypoglycemia, hypotonia, metabolic acidosis, ketoacidosis, hyperammonemia, and if left untreated, death. Cause Most of the organic acidemias result from defective autosomal genes for various enzymes important to amino acid metabolism. Neurological and physiological harm is caused by this impaired ability to synthesize a key enzy