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

Methylmalonic acidemia

Reviewed July 2011

What is methylmalonic acidemia?

Methylmalonic acidemia is an inherited disorder in which the body is unable to process certain proteins and fats (lipids) properly. The effects of methylmalonic acidemia, which usually appear in early infancy, vary from mild to life-threatening. Affected infants can experience vomiting, dehydration, weak muscle tone (hypotonia), developmental delay, excessive tiredness (lethargy), an enlarged liver (hepatomegaly), and failure to gain weight and grow at the expected rate (failure to thrive). Long-term complications can include feeding problems, intellectual disability, chronic kidney disease, and inflammation of the pancreas (pancreatitis). Without treatment, this disorder can lead to coma and death in some cases.

How common is methylmalonic acidemia?

This condition occurs in an estimated 1 in 50,000 to 100,000 people.

What genes are related to methylmalonic acidemia?

Mutations in the MUT, MMAA, MMAB, MMADHC, and MCEE genes cause methylmalonic acidemia. The long term effects of methylmalonic acidemia depend on which gene is mutated and the severity of the mutation.

About 60 percent of methylmalonic acidemia cases are caused by mutations in the MUT gene. This gene provides instructions for making an enzyme called methylmalonyl CoA mutase. This enzyme works with vitamin B12 (also called cobalamin) to break down several protein building blocks (amino acids), certain lipids, and cholesterol. Mutations in the MUT gene alter the enzyme's structure or reduce the amount of the enzyme, which prevents these molecules from being broken down properly. As a result, a substance called methylmalonyl CoA and other potentially toxic compounds can accumulate in the body's organs and tissues, causing the signs and symptoms of methylmalonic acidemia.

Mutations in the MUT gene that prevent the production of any functional enzyme result in a form of the condition designated mut0. Mut0 is the most severe form of methylmalonic acidemia and has the poorest outcome. Mutations that change the structure of methylmalonyl CoA mutase but do not eliminate its activity cause a form of the condition designated mut-. The mut- form is typically less severe, with more variable symptoms than the mut0 form.

Some cases of methylmalonic acidemia are caused by mutations in the MMAA, MMAB, or MMADHC gene. Proteins produced from the MMAA, MMAB, and MMADHC genes are needed for the proper function of methylmalonyl CoA mutase. Mutations that affect proteins produced from these three genes can impair the activity of methylmalonyl CoA mutase, leading to methylmalonic acidemia.

A few other cases of methylmalonic acidemia are caused by mutations in the MCEE gene. This gene provides instructions for producing an enzyme called methylmalonyl CoA epimerase. Like methylmalonyl CoA mutase, this enzyme also plays a role in the breakdown of amino acids, certain lipids, and cholesterol. Disruption in the function of methylmalonyl CoA epimerase leads to a mild form of methylmalonic acidemia.

It is likely that mutations in other, unidentified genes also cause methylmalonic acidemia.

Related Gene(s)

Changes in these genes are associated with methylmalonic acidemia.

  • MCEE
  • MMAA
  • MMAB
  • MUT

How do people inherit methylmalonic acidemia?

This condition is inherited in an autosomal recessive pattern, which means both copies of the MUT, MMAA, MMAB, MMADHC, or MCEE gene in each cell have mutations. Most often, the parents of an individual with an autosomal recessive condition are carriers of one copy of the mutated gene but do not show signs and symptoms of the condition.

Where can I find information about diagnosis or management of methylmalonic acidemia?

These resources address the diagnosis or management of methylmalonic acidemia and may include treatment providers.

  • Baby's First Test: Methylmalonic Acidemia (Cobalamin Disorders) (
  • Baby's First Test: Methylmalonic Acidemia (Methymalonyl-CoA Mutase Deficiency) (
  • Gene Review: Isolated Methylmalonic Acidemia (
  • Gene Review: Organic Acidemias Overview (
  • Genetic Testing Registry: Methylmalonic acidemia (
  • Genetic Testing Registry: Methylmalonic acidemia with homocystinuria cblD (
  • Genetic Testing Registry: Methylmalonic aciduria cblA type (
  • Genetic Testing Registry: Methylmalonic aciduria cblB type (
  • Genetic Testing Registry: Methylmalonic aciduria due to methylmalonyl-CoA mutase deficiency (
  • Genetic Testing Registry: Methylmalonyl-CoA epimerase deficiency (
  • MedlinePlus Encyclopedia: Methylmalonic acid (
  • MedlinePlus Encyclopedia: Methylmalonic acidemia (
  • New England Consortium of Metabolic Programs (

You might also find information on the diagnosis or management of methylmalonic acidemia in Educational resources and Patient support.

General information about the diagnosis ( and management ( of genetic conditions is available in the Handbook. Read more about genetic testing (, particularly the difference between clinical tests and research tests (

To locate a healthcare provider, see How can I find a genetics professional in my area? ( in the Handbook.

Where can I find additional information about methylmalonic acidemia?

You may find the following resources about methylmalonic acidemia helpful. These materials are written for the general public.

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

What other names do people use for methylmalonic acidemia?

  • isolated methylmalonic acidemia
  • methylmalonic aciduria
  • MMA

For more information about naming genetic conditions, see the Genetics Home Reference Condition Naming Guidelines ( and How are genetic conditions and genes named? ( in the Handbook.

What if I still have specific questions about methylmalonic acidemia?

Ask the Genetic and Rare Diseases Information Center (

What glossary definitions help with understanding methylmalonic acidemia?

acids ; aciduria ; amino acid ; autosomal ; autosomal recessive ; breakdown ; cell ; cholesterol ; chronic ; CoA ; cobalamin ; coma ; deficiency ; dehydration ; developmental delay ; disability ; enzyme ; failure to thrive ; gene ; hypotonia ; inflammation ; inherited ; kidney ; lethargy ; metabolism ; muscle tone ; mutation ; newborn screening ; pancreas ; pancreatitis ; protein ; recessive ; screening ; toxic ; vitamin B12

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


  • Coelho D, Suormala T, Stucki M, Lerner-Ellis JP, Rosenblatt DS, Newbold RF, Baumgartner MR, Fowler B. Gene identification for the cblD defect of vitamin B12 metabolism. N Engl J Med. 2008 Apr 3;358(14):1454-64. doi: 10.1056/NEJMoa072200. (
  • Deodato F, Boenzi S, Santorelli FM, Dionisi-Vici C. Methylmalonic and propionic aciduria. Am J Med Genet C Semin Med Genet. 2006 May 15;142C(2):104-12. Review. (
  • Fowler B, Leonard JV, Baumgartner MR. Causes of and diagnostic approach to methylmalonic acidurias. J Inherit Metab Dis. 2008 Jun;31(3):350-60. doi: 10.1007/s10545-008-0839-4. Epub 2008 Jun 19. Review. (
  • Gene Review: Isolated Methylmalonic Acidemia (
  • Hörster F, Baumgartner MR, Viardot C, Suormala T, Burgard P, Fowler B, Hoffmann GF, Garbade SF, Kölker S, Baumgartner ER. Long-term outcome in methylmalonic acidurias is influenced by the underlying defect (mut0, mut-, cblA, cblB). Pediatr Res. 2007 Aug;62(2):225-30. (
  • Hörster F, Hoffmann GF. Pathophysiology, diagnosis, and treatment of methylmalonic aciduria-recent advances and new challenges. Pediatr Nephrol. 2004 Oct;19(10):1071-4. Epub 2004 Aug 4. Review. (
  • Miousse IR, Watkins D, Coelho D, Rupar T, Crombez EA, Vilain E, Bernstein JA, Cowan T, Lee-Messer C, Enns GM, Fowler B, Rosenblatt DS. Clinical and molecular heterogeneity in patients with the cblD inborn error of cobalamin metabolism. J Pediatr. 2009 Apr;154(4):551-6. doi: 10.1016/j.jpeds.2008.10.043. Epub 2008 Dec 5. (
  • Ogier de Baulny H, Saudubray JM. Branched-chain organic acidurias. Semin Neonatol. 2002 Feb;7(1):65-74. Review. (
  • Tanpaiboon P. Methylmalonic acidemia (MMA). Mol Genet Metab. 2005 May;85(1):2-6. Review. (


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: July 2011
Published: February 1, 2016