Ataxia Telangiectasia (A-T, OMIM #208900) is a rare multi-organ, monogenetic, autosomal recessive disorder with an incidence of 1 in 40,000–100,000 life births1, caused by mutations in the ataxia telangiectasia mutated (ATM) gene2. Here, ATM is linked to ataxia telangiectasia.