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Propionic acidemia is an inherited disorder in which the body is unable to process certain parts of proteins and lipids (fats) properly. It is classified as an organic acid disorder, which is a condition that leads to an abnormal buildup of particular acids known as organic acids. Abnormal levels of organic acids in the blood (organic acidemia), urine (organic aciduria), and tissues can be toxic and can cause serious health problems.

genetic conditions
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1. Introduction

In most cases, the features of propionic acidemia become apparent within a few days after birth. The initial symptoms include poor feeding, vomiting, loss of appetite, weak muscle tone (hypotonia), and lack of energy (lethargy). These symptoms sometimes progress to more serious medical problems, including heart abnormalities, seizures, coma, and possibly death.

Less commonly, the signs and symptoms of propionic acidemia appear during childhood and may come and go over time. Some affected children experience intellectual disability or delayed development. In children with this later-onset form of the condition, episodes of more serious health problems can be triggered by prolonged periods without food (fasting), fever, or infections.

2. Frequency

Propionic acidemia affects about 1 in 100,000 people in the United States. The condition appears to be more common in several populations worldwide, including the Inuit population of Greenland, some Amish communities, and Saudi Arabians.

3. Causes

Mutations in the PCCA and PCCB genes cause propionic acidemia. These genes provide instructions for making two parts (subunits) of an enzyme called propionyl-CoA carboxylase, which plays a role in the normal breakdown of proteins. Specifically, this enzyme helps process several amino acids, which are the building blocks of proteins. Propionyl-CoA carboxylase also helps break down certain types of fat and cholesterol in the body. Mutations in the PCCA or PCCB gene disrupt the function of the enzyme and prevent the normal breakdown of these molecules. As a result, a substance called propionyl-CoA and other potentially harmful compounds can build up to toxic levels in the body. This buildup damages the brain and nervous system, causing the serious health problems associated with propionic acidemia.

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

  • hyperglycinemia with ketoacidosis and leukopenia
  • ketotic glycinemia
  • ketotic hyperglycinemia
  • PCC deficiency
  • PROP
  • propionicacidemia
  • propionyl-CoA carboxylase deficiency

References

  1. Aldubayan SH, Rodan LH, Berry GT, Levy HL. Acute Illness Protocol for Organic Acidemias: Methylmalonic Acidemia and Propionic Acidemia. Pediatr Emerg Care.2017 Feb;33(2):142-146. doi: 10.1097/PEC.0000000000001028.
  2. Baumgartner D, Scholl-Bürgi S, Sass JO, Sperl W, Schweigmann U, Stein JI,Karall D. Prolonged QTc intervals and decreased left ventricular contractility inpatients with propionic acidemia. J Pediatr. 2007 Feb;150(2):192-7, 197.e1.
  3. Baumgartner MR, Hörster F, Dionisi-Vici C, Haliloglu G, Karall D, Chapman KA, Huemer M, Hochuli M, Assoun M, Ballhausen D, Burlina A, Fowler B, Grünert SC,Grünewald S, Honzik T, Merinero B, Pérez-Cerdá C, Scholl-Bürgi S, Skovby F,Wijburg F, MacDonald A, Martinelli D, Sass JO, Valayannopoulos V, Chakrapani A.Proposed guidelines for the diagnosis and management of methylmalonic andpropionic acidemia. Orphanet J Rare Dis. 2014 Sep 2;9:130. doi:10.1186/s13023-014-0130-8. Review.
  4. Fraser JL, Venditti CP. Methylmalonic and propionic acidemias: clinicalmanagement update. Curr Opin Pediatr. 2016 Dec;28(6):682-693. Review.
  5. Grünert SC, Müllerleile S, De Silva L, Barth M, Walter M, Walter K, MeissnerT, Lindner M, Ensenauer R, Santer R, Bodamer OA, Baumgartner MR, Brunner-KrainzM, Karall D, Haase C, Knerr I, Marquardt T, Hennermann JB, Steinfeld R, Beblo S, Koch HG, Konstantopoulou V, Scholl-Bürgi S, van Teeffelen-Heithoff A, Suormala T,Sperl W, Kraus JP, Superti-Furga A, Schwab KO, Sass JO. Propionic acidemia:clinical course and outcome in 55 pediatric and adolescent patients. Orphanet JRare Dis. 2013 Jan 10;8:6. doi: 10.1186/1750-1172-8-6.
  6. Pena L, Franks J, Chapman KA, Gropman A, Ah Mew N, Chakrapani A, Island E,MacLeod E, Matern D, Smith B, Stagni K, Sutton VR, Ueda K, Urv T, Venditti C,Enns GM, Summar ML. Natural history of propionic acidemia. Mol Genet Metab. 2012 Jan;105(1):5-9. doi: 10.1016/j.ymgme.2011.09.022.
  7. Schreiber J, Chapman KA, Summar ML, Ah Mew N, Sutton VR, MacLeod E, Stagni K, Ueda K, Franks J, Island E, Matern D, Peña L, Smith B, Urv T, Venditti C,Chakarapani A, Gropman AL. Neurologic considerations in propionic acidemia. MolGenet Metab. 2012 Jan;105(1):10-5. doi: 10.1016/j.ymgme.2011.10.003.
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Entry Collection: MedlinePlus
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Update Time: 24 Dec 2020
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    Xu, R. Propionic Acidemia. Encyclopedia. Available online: https://encyclopedia.pub/entry/5492 (accessed on 29 September 2022).
    Xu R. Propionic Acidemia. Encyclopedia. Available at: https://encyclopedia.pub/entry/5492. Accessed September 29, 2022.
    Xu, Rita. "Propionic Acidemia," Encyclopedia, https://encyclopedia.pub/entry/5492 (accessed September 29, 2022).
    Xu, R. (2020, December 24). Propionic Acidemia. In Encyclopedia. https://encyclopedia.pub/entry/5492
    Xu, Rita. ''Propionic Acidemia.'' Encyclopedia. Web. 24 December, 2020.
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