Encyclopedia
Costeff syndrome is an inherited condition characterized by vision loss, delayed development, and movement problems. Vision loss is primarily caused by degeneration (atrophy) of the optic nerves, which carry information from the eyes to the brain. This optic nerve atrophy often begins in infancy or early childhood and results in vision impairment that worsens over time. Some affected individuals have rapid and involuntary eye movements (nystagmus) or eyes that do not look in the same direction (strabismus).
- genetic conditions
1. Introduction
Development of motor skills, such as walking, is often delayed in people with Costeff syndrome. Affected individuals may also have speech difficulties (dysarthria). While some people with Costeff syndrome have mild to moderate intellectual disability, many have normal intelligence.
Movement problems in people with Costeff syndrome develop in late childhood and include muscle stiffness (spasticity), impaired muscle coordination (ataxia), and involuntary jerking movements (choreiform movements). As a result of these movement difficulties, individuals with Costeff syndrome may require wheelchair assistance.
Costeff syndrome is associated with increased levels of a substance called 3-methylglutaconic acid in the urine (3-methylglutaconic aciduria). The amount of this substance does not appear to influence the signs and symptoms of the condition. Costeff syndrome is one of a group of metabolic disorders that can be diagnosed by the presence of 3-methylglutaconic aciduria. People with Costeff syndrome also have high levels of another acid called 3-methylglutaric acid in their urine.
2. Frequency
Costeff syndrome affects an estimated 1 in 10,000 individuals in the Iraqi Jewish population, in which at least 40 cases have been described. Outside this population, only a few affected individuals have been identified.
3. Causes
Mutations in a gene called OPA3 cause Costeff syndrome. The OPA3 gene provides instructions for making a protein whose exact function is unknown. The OPA3 protein is found in structures called mitochondria, which are the energy-producing centers of cells. It is thought to play a role in the organization of the shape and structure of mitochondria and in controlled cell death (apoptosis).
OPA3 gene mutations that result in Costeff syndrome lead to a loss of OPA3 protein function. Cells without any functional OPA3 protein have abnormally shaped mitochondria. These cells likely have reduced energy production and die prematurely, decreasing energy availability in the body's tissues. Cells in the eyes and brain have high energy demands, and it is likely that they are particularly vulnerable to cell death due to dysfunctional mitochondria and reduced energy production.
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
- 3-methylglutaconic aciduria type 3
- 3-methylglutaconic aciduria type III
- autosomal recessive OPA3
- autosomal recessive optic atrophy 3
- Costeff optic atrophy syndrome
- infantile optic atrophy with chorea and spastic paraplegia
- Iraqi Jewish optic atrophy plus
- MGA, type III
- MGA3
- OPA3 defect
- optic atrophy plus syndrome
This entry is adapted from the peer-reviewed paper https://medlineplus.gov/genetics/condition/costeff-syndrome
References
- Anikster Y, Kleta R, Shaag A, Gahl WA, Elpeleg O. Type III 3-methylglutaconic aciduria (optic atrophy plus syndrome, or Costeff optic atrophy syndrome):identification of the OPA3 gene and its founder mutation in Iraqi Jews. Am J Hum Genet. 2001 Dec;69(6):1218-24.
- Elpeleg ON, Costeff H, Joseph A, Shental Y, Weitz R, Gibson KM.3-Methylglutaconic aciduria in the Iraqi-Jewish 'optic atrophy plus' (Costeff)syndrome. Dev Med Child Neurol. 1994 Feb;36(2):167-72.
- Huizing M, Dorward H, Ly L, Klootwijk E, Kleta R, Skovby F, Pei W, Feldman B, Gahl WA, Anikster Y. OPA3, mutated in 3-methylglutaconic aciduria type III,encodes two transcripts targeted primarily to mitochondria. Mol Genet Metab. 2010Jun;100(2):149-54. doi: 10.1016/j.ymgme.2010.03.005.
- Sofer S, Schweiger A, Blumkin L, Yahalom G, Anikster Y, Lev D, Ben-Zeev B,Lerman-Sagie T, Hassin-Baer S. The neuropsychological profile of patients with3-methylglutaconic aciduria type III, Costeff syndrome. Am J Med Genet BNeuropsychiatr Genet. 2015 Apr;168B(3):197-203. doi: 10.1002/ajmg.b.32296.
- Wortmann SB, Duran M, Anikster Y, Barth PG, Sperl W, Zschocke J, Morava E,Wevers RA. Inborn errors of metabolism with 3-methylglutaconic aciduria asdiscriminative feature: proper classification and nomenclature. J Inherit MetabDis. 2013 Nov;36(6):923-8. doi: 10.1007/s10545-012-9580-0.Review.
- Yahalom G, Anikster Y, Huna-Baron R, Hoffmann C, Blumkin L, Lev D, Tsabari R, Nitsan Z, Lerman SF, Ben-Zeev B, Pode-Shakked B, Sofer S, Schweiger A,Lerman-Sagie T, Hassin-Baer S. Costeff syndrome: clinical features and naturalhistory. J Neurol. 2014 Dec;261(12):2275-82. doi: 10.1007/s00415-014-7481-x.
