Cerebellar Ataxia, Early-Onset, with Retained Tendon Reflexes, also known as harding ataxia, is related to ataxia, early-onset, with oculomotor apraxia and hypoalbuminemia and 3-methylglutaconic aciduria, type iii, and has symptoms including cerebellar ataxia Affiliated tissues include cortex and colon, and related phenotypes are progressive cerebellar ataxia and abnormal pyramidal sign