What causes ataxia-telangiectasia (A-T)?

Updated: Apr 06, 2020
  • Author: Camila K Janniger, MD; Chief Editor: Dirk M Elston, MD  more...
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The ataxia-telangiectasia gene has been localized to band 11q22-23. The gene, called ATM (ataxia-telangiectasia mutated), is a member of a family of phosphatidylinositol-3-kinase–related genes involved in cell cycle control, intracellular protein transport, and DNA damage response. Little correlation exists between the level of ATM protein and the type of underlying mutation, clinical phenotype, or radiophenotype. The discovery of this gene has also led to phenotypic spectrum expansion. [21]  Also see Laboratory Studies.

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