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Genetics Home Reference: your guide to understanding genetic conditions     A service of the U.S. National Library of Medicine®


Reviewed May 2015

What is the official name of the ACADS gene?

The official name of this gene is “acyl-CoA dehydrogenase, C-2 to C-3 short chain.”

ACADS is the gene's official symbol. The ACADS gene is also known by other names, listed below.

What is the normal function of the ACADS gene?

The ACADS gene provides instructions for making an enzyme called short-chain acyl-CoA dehydrogenase (SCAD). This enzyme functions within mitochondria, the energy-producing centers within cells. SCAD is essential for fatty acid oxidation, which is the multistep process that breaks down (metabolizes) fats and converts them to energy.

SCAD is required to metabolize a group of fats called short-chain fatty acids. These fatty acids are found in some foods and are also produced when larger fatty acids are metabolized. Fatty acids are a major source of energy for the heart and muscles. During periods without food (fasting), fatty acids are also an important energy source for the liver and other tissues.

How are changes in the ACADS gene related to health conditions?

short-chain acyl-CoA dehydrogenase deficiency - caused by mutations in the ACADS gene

More than 55 mutations in the ACADS gene have been found to cause short-chain acyl-CoA dehydrogenase (SCAD) deficiency. Almost all of these mutations change single protein building blocks (amino acids) in the SCAD enzyme. These mutations prevent the enzyme from properly metabolizing short-chain fatty acids. As a result, these fats are not converted into energy, which can lead to the characteristic signs and symptoms of this disorder, including lack of energy (lethargy), low blood sugar (hypoglycemia), poor muscle tone (hypotonia), and weakness.

Researchers have also identified two common variations (polymorphisms) in the ACADS gene that each change one amino acid in the SCAD enzyme. Unlike other changes in the ACADS gene, these polymorphisms do not cause SCAD deficiency but may increase a person's risk of developing this disorder. One of these polymorphisms replaces the amino acid arginine with the amino acid tryptophan at protein position 147 (written as Arg147Trp or R147W). The other polymorphism switches the amino acid glycine with the amino acid serine at protein position 185 (written as Gly185Ser or G185S). Other genetic and environmental factors likely influence the risk of developing SCAD deficiency when a person carries either of these polymorphisms.

Where is the ACADS gene located?

Cytogenetic Location: 12q24.31

Molecular Location on chromosome 12: base pairs 120,725,738 to 120,740,008

(Homo sapiens Annotation Release 107, GRCh38.p2) (NCBI (

The ACADS gene is located on the long (q) arm of chromosome 12 at position 24.31.

The ACADS gene is located on the long (q) arm of chromosome 12 at position 24.31.

More precisely, the ACADS gene is located from base pair 120,725,738 to base pair 120,740,008 on chromosome 12.

See How do geneticists indicate the location of a gene? ( in the Handbook.

Where can I find additional information about ACADS?

You and your healthcare professional may find the following resources about ACADS helpful.

You may also be interested in these resources, which are designed for genetics professionals and researchers.

What other names do people use for the ACADS gene or gene products?

  • ACAD3
  • acyl-Coenzyme A dehydrogenase, C-2 to C-3 short chain precursor
  • Butyryl-CoA dehydrogenase
  • Butyryl dehydrogenase
  • SCAD
  • Unsaturated acyl-CoA reductase

See How are genetic conditions and genes named? ( in the Handbook.

What glossary definitions help with understanding ACADS?

acids ; amino acid ; arginine ; CoA ; coenzyme A ; deficiency ; dehydrogenase ; enzyme ; fasting ; fatty acids ; gene ; glycine ; hypoglycemia ; hypotonia ; lethargy ; mitochondria ; muscle tone ; oxidation ; polymorphism ; precursor ; protein ; serine ; tryptophan

You may find definitions for these and many other terms in the Genetics Home Reference Glossary.


  • Gregersen N, Andresen BS, Corydon MJ, Corydon TJ, Olsen RK, Bolund L, Bross P. Mutation analysis in mitochondrial fatty acid oxidation defects: Exemplified by acyl-CoA dehydrogenase deficiencies, with special focus on genotype-phenotype relationship. Hum Mutat. 2001 Sep;18(3):169-89. Review. (
  • Jethva R, Bennett MJ, Vockley J. Short-chain acyl-coenzyme A dehydrogenase deficiency. Mol Genet Metab. 2008 Dec;95(4):195-200. doi: 10.1016/j.ymgme.2008.09.007. Epub 2008 Nov 5. Review. (
  • Kim SH, Park HD, Sohn YB, Park SW, Cho SY, Ji S, Kim SJ, Choi EW, Kim CH, Ko AR, Yeau S, Paik KH, Jin DK. Mutations of ACADS gene associated with short-chain acyl-coenzyme A dehydrogenase deficiency. Ann Clin Lab Sci. 2011 Fall;41(1):84-8. (
  • Nagan N, Kruckeberg KE, Tauscher AL, Bailey KS, Rinaldo P, Matern D. The frequency of short-chain acyl-CoA dehydrogenase gene variants in the US population and correlation with the C(4)-acylcarnitine concentration in newborn blood spots. Mol Genet Metab. 2003 Apr;78(4):239-46. (
  • NCBI Gene (
  • Pedersen CB, Kølvraa S, Kølvraa A, Stenbroen V, Kjeldsen M, Ensenauer R, Tein I, Matern D, Rinaldo P, Vianey-Saban C, Ribes A, Lehnert W, Christensen E, Corydon TJ, Andresen BS, Vang S, Bolund L, Vockley J, Bross P, Gregersen N. The ACADS gene variation spectrum in 114 patients with short-chain acyl-CoA dehydrogenase (SCAD) deficiency is dominated by missense variations leading to protein misfolding at the cellular level. Hum Genet. 2008 Aug;124(1):43-56. doi: 10.1007/s00439-008-0521-9. Epub 2008 Jun 4. (
  • Schmidt SP, Corydon TJ, Pedersen CB, Bross P, Gregersen N. Misfolding of short-chain acyl-CoA dehydrogenase leads to mitochondrial fission and oxidative stress. Mol Genet Metab. 2010 Jun;100(2):155-62. doi: 10.1016/j.ymgme.2010.03.009. Epub 2010 Mar 19. (
  • Schmidt SP, Corydon TJ, Pedersen CB, Vang S, Palmfeldt J, Stenbroen V, Wanders RJ, Ruiter JP, Gregersen N. Toxic response caused by a misfolding variant of the mitochondrial protein short-chain acyl-CoA dehydrogenase. J Inherit Metab Dis. 2011 Apr;34(2):465-75. doi: 10.1007/s10545-010-9255-7. Epub 2010 Dec 18. (
  • Shirao K, Okada S, Tajima G, Tsumura M, Hara K, Yasunaga S, Ohtsubo M, Hata I, Sakura N, Shigematsu Y, Takihara Y, Kobayashi M. Molecular pathogenesis of a novel mutation, G108D, in short-chain acyl-CoA dehydrogenase identified in subjects with short-chain acyl-CoA dehydrogenase deficiency. Hum Genet. 2010 Jun;127(6):619-28. doi: 10.1007/s00439-010-0822-7. Epub 2010 Apr 8. Review. (
  • van Maldegem BT, Waterham HR, Duran M, van der Vlies M, van Woerden CS, Bobu LL, Wanders RJ, Wijburg FA. The 625G>A SCAD gene variant is common but not associated with increased C4-carnitine in newborn blood spots. J Inherit Metab Dis. 2005;28(4):557-62. (
  • Young SP, Matern D, Gregersen N, Stevens RD, Bali D, Liu HM, Koeberl DD, Millington DS. A comparison of in vitro acylcarnitine profiling methods for the diagnosis of classical and variant short chain acyl-CoA dehydrogenase deficiency. Clin Chim Acta. 2003 Nov;337(1-2):103-13. (


The resources on this site should not be used as a substitute for professional medical care or advice. Users seeking information about a personal genetic disease, syndrome, or condition should consult with a qualified healthcare professional. See How can I find a genetics professional in my area? ( in the Handbook.

Reviewed: May 2015
Published: February 8, 2016