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Xu, R. Medium-Chain Acyl-CoA Dehydrogenase Deficiency. Encyclopedia. Available online: (accessed on 23 April 2024).
Xu R. Medium-Chain Acyl-CoA Dehydrogenase Deficiency. Encyclopedia. Available at: Accessed April 23, 2024.
Xu, Rita. "Medium-Chain Acyl-CoA Dehydrogenase Deficiency" Encyclopedia, (accessed April 23, 2024).
Xu, R. (2020, December 22). Medium-Chain Acyl-CoA Dehydrogenase Deficiency. In Encyclopedia.
Xu, Rita. "Medium-Chain Acyl-CoA Dehydrogenase Deficiency." Encyclopedia. Web. 22 December, 2020.
Medium-Chain Acyl-CoA Dehydrogenase Deficiency

Medium-chain acyl-CoA dehydrogenase (MCAD) deficiency is a condition that prevents the body from converting certain fats to energy, particularly during periods without food (fasting).

genetic conditions

1. Introduction

Signs and symptoms of MCAD deficiency typically appear during infancy or early childhood and can include vomiting, lack of energy (lethargy), and low blood sugar (hypoglycemia). In rare cases, symptoms of this disorder are not recognized early in life, and the condition is not diagnosed until adulthood. People with MCAD deficiency are at risk of serious complications such as seizures, breathing difficulties, liver problems, brain damage, coma, and sudden death.

Problems related to MCAD deficiency can be triggered by periods of fasting or by illnesses such as viral infections. This disorder is sometimes mistaken for Reye syndrome, a severe disorder that may develop in children while they appear to be recovering from viral infections such as chicken pox or flu. Most cases of Reye syndrome are associated with the use of aspirin during these viral infections.

2. Frequency

In the United States, the estimated incidence of MCAD deficiency is 1 in 17,000 people. The condition is more common in people of northern European ancestry than in other ethnic groups.

3. Causes

Mutations in the ACADM gene cause MCAD deficiency. This gene provides instructions for making an enzyme called medium-chain acyl-CoA dehydrogenase, which is required to break down (metabolize) a group of fats called medium-chain fatty acids. These fatty acids are found in foods and the body's fat tissues. Fatty acids are a major source of energy for the heart and muscles. During periods of fasting, fatty acids are also an important energy source for the liver and other tissues.

Mutations in the ACADM gene lead to a shortage (deficiency) of the MCAD enzyme within cells. Without sufficient amounts of this enzyme, medium-chain fatty acids are not metabolized properly. As a result, these fats are not converted to energy, which can lead to the characteristic signs and symptoms of this disorder such as lethargy and hypoglycemia. Medium-chain fatty acids or partially metabolized fatty acids may also build up in tissues and damage the liver and brain. This abnormal buildup causes the other signs and symptoms of MCAD deficiency.

4. Inheritance

This condition is inherited in an autosomal recessive pattern, which means both copies of the gene in each cell have mutations. The parents of an individual with an autosomal recessive condition each carry one copy of the mutated gene, but they typically do not show signs and symptoms of the condition.

5. Other Names for This Condition

  • ACADM deficiency
  • MCAD deficiency
  • MCADH deficiency
  • medium chain acyl-CoA dehydrogenase deficiency
  • medium-chain acyl-coenzyme A dehydrogenase deficiency


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  5. Joy P, Black C, Rocca A, Haas M, Wilcken B. Neuropsychological functioning in children with medium chain acyl coenzyme a dehydrogenase deficiency (MCADD): the impact of early diagnosis and screening on outcome. Child Neuropsychol. 2009Jan;15(1):8-20. doi: 10.1080/09297040701864570.
  6. Lang TF. Adult presentations of medium-chain acyl-CoA dehydrogenase deficiency(MCADD). J Inherit Metab Dis. 2009 Dec;32(6):675-683. doi:10.1007/s10545-009-1202-0.
  7. Merritt JL 2nd, Chang IJ. Medium-Chain Acyl-Coenzyme A DehydrogenaseDeficiency. 2000 Apr 20 [updated 2019 Jun 27]. In: Adam MP, Ardinger HH, PagonRA, Wallace SE, Bean LJH, Stephens K, Amemiya A, editors. GeneReviews®[Internet]. Seattle (WA): University of Washington, Seattle; 1993-2020. Availablefrom
  8. Touw CM, Smit GP, de Vries M, de Klerk JB, Bosch AM, Visser G, Mulder MF,Rubio-Gozalbo ME, Elvers B, Niezen-Koning KE, Wanders RJ, Waterham HR, Reijngoud DJ, Derks TG. Risk stratification by residual enzyme activity after newbornscreening for medium-chain acyl-CoA dehyrogenase deficiency: data from a cohortstudy. Orphanet J Rare Dis. 2012 May 25;7:30. doi: 10.1186/1750-1172-7-30.
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Update Date: 23 Dec 2020