Propionic acidemia
Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-in-Chief:
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Overview
Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-in-Chief:
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Overview
Propionic acidemia, also known as propionic aciduria, propionyl-CoA carboxylase deficiency and ketotic glycinemia,[1] is an autosomal recessive[2] metabolic disorder, classified as a branched-chain organic acidemia.[3]
The disorder presents in the early neonatal period with progressive encephalopathy. Death can occur quickly, due to secondary hyperammonemia, infection, cardiomyopathy, or basal ganglial stroke.[4]
Propionic acidemia is a rare disorder that is inherited from both parents. Being autosomal recessive, neither parent shows symptoms, but both carry a defective gene responsible for this disease. It takes two faulty genes to cause PA, so there is a 1 in 4 chance for these parents to have a child with PA.
Historical Perspective
Classification
Pathophysiology
Causes
Differentiating Propionic acidemia from Other Diseases
Epidemiology and Demographics
Risk Factors
Screening
Natural History, Complications, and Prognosis
Diagnosis
Diagnostic Criteria
History and Symptoms
Physical Examination
Laboratory Findings
Imaging Findings
Other Diagnostic Studies
Treatment
Medical Therapy
Surgery
Prevention
References
- ↑ Online Mendelian Inheritance in Man (OMIM) 606054
- ↑ Ravn K; Chloupkova M; Christensen E; Brandt NJ; Simonsen H; Kraus JP; Nielsen IM; Skovby F; Schwartz M (July 2000). “High incidence of propionic acidemia in greenland is due to a prevalent mutation, 1540insCCC, in the gene for the beta-subunit of propionyl CoA carboxylase”. American Journal of Human Genetics. 67 (1): 203–206. doi:10.1086/302971. PMC 1287078. PMID 10820128.
- ↑ Deodato F, Boenzi S, Santorelli FM, Dionisi-Vici C (2006). “Methylmalonic and propionic aciduria”. Am J Med Genet C Semin Med Genet. 142 (2): 104–112. doi:10.1002/ajmg.c.30090. PMID 16602092.
- ↑ Hamilton RL, Haas RH, Nyhan WC, Powell HC, Grafe MR (1995). “Neuropathology of propionic acidemia: a report of two patients with basal ganglia lesions”. Journal of Child Neurology. 10 (1): 25–30. doi:10.1177/088307389501000107. PMID 7769173.
Historical Perspective
Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-in-Chief:
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Overview
Historical Perspective
References
Classification
Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-in-Chief:
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Overview
Classification
References
Pathophysiology
Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-in-Chief:
Overview
Propionic acidemia, also known as propionic aciduria, propionyl-CoA carboxylase deficiency and ketotic glycinemia,[1] is an autosomal recessive[2] metabolic disorder, classified as a branched-chain organic acidemia.[3]
The disorder presents in the early neonatal period with progressive encephalopathy. Death can occur quickly, due to secondary hyperammonemia, infection, cardiomyopathy, or basal ganglial stroke.[4]
Propionic acidemia is a rare disorder that is inherited from both parents. Being autosomal recessive, neither parent shows symptoms, but both carry a defective gene responsible for this disease. It takes two faulty genes to cause PA, so there is a 1 in 4 chance for these parents to have a child with PA.
Pathophysiology
In healthy individuals, the enzyme propionyl CoA carboxylase converts propionyl CoA to methylmalonyl CoA. This is one step in the process of converting certain amino acids and fats into sugar for energy. Individuals with PA cannot perform this conversion because the enzyme propionyl CoA carboxylase is nonfunctional. The essential amino acids isoleucine, valine, threonine, and methionine, as well as odd-chain fatty acids, are simply converted to propionyl CoA, before the process stops, leading to a buildup of propionyl CoA. Instead of being converted to methylmalonyl CoA, propionyl CoA is then converted into propionic acid, which builds up in the bloodstream. This in turn causes an accumulation of dangerous acids and toxins, which can cause damage to the organs.
In many cases, PA can damage the brain, heart, and liver, cause seizures, and delays to normal development like walking and talking. During times of illness the affected person may need to be hospitalized to prevent breakdown of proteins within the body. Each meal presents a challenge to those with PA. If not constantly monitored, the effects would be devastating. Dietary needs must be closely managed by a metabolic geneticist or metabolic dietician.
Mutations in both copies of the PCCA or PCCB genes cause propionic acidemia.[5] These genes are responsible for the formation of the enzyme propionyl-CoA carboxylase (EC 6.4.1.3), referred to as PCC.
PCC is required for the normal breakdown of the essential amino acids valine, isoleucine, threonine, and methionine, as well as certain odd-chained fatty-acids. Mutations in the PCCA or PCCB genes disrupt the function of the enzyme, preventing these acids from being metabolized. As a result, propionyl-CoA, propionic acid, ketones, ammonia, and other toxic compounds accumulate in the blood, causing the signs and symptoms of propionic acidemia.
References
- ↑ Online Mendelian Inheritance in Man (OMIM) 606054
- ↑ Ravn K; Chloupkova M; Christensen E; Brandt NJ; Simonsen H; Kraus JP; Nielsen IM; Skovby F; Schwartz M (July 2000). “High incidence of propionic acidemia in greenland is due to a prevalent mutation, 1540insCCC, in the gene for the beta-subunit of propionyl CoA carboxylase”. American Journal of Human Genetics. 67 (1): 203–206. doi:10.1086/302971. PMC 1287078. PMID 10820128.
- ↑ Deodato F, Boenzi S, Santorelli FM, Dionisi-Vici C (2006). “Methylmalonic and propionic aciduria”. Am J Med Genet C Semin Med Genet. 142 (2): 104–112. doi:10.1002/ajmg.c.30090. PMID 16602092.
- ↑ Hamilton RL, Haas RH, Nyhan WC, Powell HC, Grafe MR (1995). “Neuropathology of propionic acidemia: a report of two patients with basal ganglia lesions”. Journal of Child Neurology. 10 (1): 25–30. doi:10.1177/088307389501000107. PMID 7769173.
- ↑ http://mayoresearch.mayo.edu/mayo/research/barry_lab/ropionic-Aciademia.cfm
Barry Lab – Vector and Virus Engineering. Gene therapy for Propionic Acidemia
Causes
Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-in-Chief:
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Overview
Causes
References
Differentiating Propionic acidemia from other Diseases
Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-in-Chief:
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Overview
Differential Diagnosis
References
Epidemiology and Demographics
Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-in-Chief:
Overview
Propionic acidemia, also known as propionic aciduria, propionyl-CoA carboxylase deficiency and ketotic glycinemia,[1] is an autosomal recessive[2] metabolic disorder, classified as a branched-chain organic acidemia.[3] The disorder presents in the early neonatal period with progressive encephalopathy. Death can occur quickly, due to secondary hyperammonemia, infection, cardiomyopathy, or basal ganglial stroke.[4] Propionic acidemia is a rare disorder that is inherited from both parents. Being autosomal recessive, neither parent shows symptoms, but both carry a defective gene responsible for this disease. It takes two faulty genes to cause PA, so there is a 1 in 4 chance for these parents to have a child with PA.
Epidemiology and Demographics
Propionic acidemia is inherited in an autosomal recessive pattern and is found in about 1 in 35,000[5] live births in the United States. The condition appears to be more common in Saudi Arabia,[6] with a frequency of about 1 in 3,000.[5] The condition also appears to be common in Amish, Mennonite and other populations where inbreeding is common.[7]
References
- ↑ Online Mendelian Inheritance in Man (OMIM) 606054
- ↑ Ravn K; Chloupkova M; Christensen E; Brandt NJ; Simonsen H; Kraus JP; Nielsen IM; Skovby F; Schwartz M (July 2000). “High incidence of propionic acidemia in greenland is due to a prevalent mutation, 1540insCCC, in the gene for the beta-subunit of propionyl CoA carboxylase”. American Journal of Human Genetics. 67 (1): 203–206. doi:10.1086/302971. PMC 1287078. PMID 10820128.
- ↑ Deodato F, Boenzi S, Santorelli FM, Dionisi-Vici C (2006). “Methylmalonic and propionic aciduria”. Am J Med Genet C Semin Med Genet. 142 (2): 104–112. doi:10.1002/ajmg.c.30090. PMID 16602092.
- ↑ Hamilton RL, Haas RH, Nyhan WC, Powell HC, Grafe MR (1995). “Neuropathology of propionic acidemia: a report of two patients with basal ganglia lesions”. Journal of Child Neurology. 10 (1): 25–30. doi:10.1177/088307389501000107. PMID 7769173.
- ↑ 5.0 5.1 http://mayoresearch.mayo.edu/mayo/research/barry_lab/ropionic-Aciademia.cfm
Barry Lab – Vector and Virus Engineering. Gene therapy for Propionic Acidemia - ↑ Al-Odaib AN, Abu-Amaro KK, Ozand PT, Al-Hellani AM (2003). “A new era for preventive genetic programs in the Arabian Peninsula”. Saudi Medical Journal. 24 (11): 1168–1175. PMID 14647548.
- ↑ Kidd JR, Wolf B, Hsia E, Kidd KK (1980). “Genetics of propionic acidemia in a Mennonite-Amish kindred”. Am J Hum Genet. 32 (2): 236–245. PMC 1686010. PMID 7386459.
Risk Factors
Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-in-Chief:
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Overview
Risk Factors
References
Screening
Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-in-Chief:
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Overview
Screening
References
Natural History, Complications and Prognosis
Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-in-Chief:
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Overview
Natural History
Complications
Prognosis
References
Diagnosis
Diagnosis
History and Symptoms | Physical Examination | Laboratory Findings | Electrocardiogram | X Ray | CT | MRI | Echocardiography or Ultrasound | Other Imaging Findings | Other Diagnostic Studies
Treatment
Treatment
Medical Therapy | Surgery | Primary Prevention | Secondary Prevention | Cost-Effectiveness of Therapy | Future or Investigational Therapies
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