APTX and Ataxia - oculomotor apraxia type 1: Other relatively common recessive ataxias include ataxia telangiectasia (A-T), ataxia with oculomotor apraxia type 1 (AOA1) and ataxia with oculomotor apraxia type 2 (AOA2), caused by mutations in the ATM-, APTX- and SETX-genes respectively, all of which encode proteins involved in DNA-repair.