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Mol Genet Metab. 2008 Dec;95(4):195-200. doi: 10.1016/j.ymgme.2008.09.007. Epub 2008 Nov 5.

Short-chain acyl-coenzyme A dehydrogenase deficiency.

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  • 1Division of Human and Molecular Genetics, Children's Hospital of Philadelphia, Abramson Research Center, Room 1002, 3615 Civic Center Boulevard, Philadelphia, PA 19104, USA.


Short-chain acyl-CoA dehydrogenase deficiency (SCADD) is a disorder of mitochondrial fatty acid oxidation that leads to the accumulation of butyrylcarnitine and ethylmalonic acid in blood and urine. Originally described with a relatively severe phenotype, most patients are now diagnosed through newborn screening by tandem mass spectrometry and remain asymptomatic. Molecular analysis of affected individuals has identified a preponderance of private inactivating point mutations and one common one present in high frequency in individuals of Ashkenazi Jewish ancestry. In addition, two polymorphic variants have been identified that have little affect on enzyme kinetics but impair folding and stability. Individuals homozygous for one of these variants or compound heterozygous for one of each often show an increased level of ethylmalonic acid excretion that appears not to be clinically significant. The combination of asymptomatic affected newborns and the frequent variants can cause much confusion in evaluating and treating individuals with SCADD. The long-term consequences and the need for chronic therapy remain current topics of contention and investigation.

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