Ataxia-Oculomotor Apraxia 4, also known as ataxia-oculomotor apraxia type 4, is related to hypercholesterolemia, familial, 1 and glioma susceptibility 1. An important gene associated with Ataxia-Oculomotor Apraxia 4 is PNKP (Polynucleotide Kinase 3'-Phosphatase). Affiliated tissues include eye, and related phenotypes are ataxia and cognitive impairment