Ataxia-telangiectasia (A-T) is a rare hereditary disorder characterized by progressive cerebellar ataxia, conjunctival telangiectasias, recurrent sinopulmonary infections, radiosensitivity, and a predisposition to malignancy. It is the most common cause of progressive cerebellar ataxia in childhood. The prevalence is estimated to be 1 in 40,000–1 in 100,000 live births.
Synonyms and Related Disorders
Louis–Bar syndrome
Genetics/Basic Defects
- 1.
Inheritance
- a.
Autosomal recessive
- b.
Genetic heterogeneity in at least five complementation groups (A–E)
- a.
- 2.
Cause
- a.
Mutations in the ataxia-telangiectasia mutated gene (ATM) which is mapped to 11q22.3
- b.
Affected individuals completely lack functional ATM protein
- c.
A high prevalence of specific ATM mutations in certain ethnic groups (Amish, Mennonite, Costa Rican, Polish, British, Italian, Turkish, Iranian, Israeli) with a founder effect, resulting in a small number of mutations that accounts for the majority of disease-causing mutant alleles
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- a.
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References
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(2012). Ataxia-Telangiectasia. In: Chen, H. (eds) Atlas of Genetic Diagnosis and Counseling. Springer, New York, NY. https://doi.org/10.1007/978-1-4614-1037-9_18
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DOI: https://doi.org/10.1007/978-1-4614-1037-9_18
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