| EOA | early onset ataxia |
| EOAD+ | early onset ataxia with dystonic comorbidity |
| EOAD− | early onset ataxia without dystonic comorbidity |
| TCA | tricarboxylic acid cycle |
| AOA | adult onset ataxia |
| AOAD+ | adult onset ataxia with dystonic comorbidity |
| SCA | spino-cerebellar ataxia |