| Phenotype details |
normal pregnancy and delivery; normal developmental milestones; walks with mild support; 34y-insidious illness, progressive limb incoordination, abnormal gait; 35y-dysarthria, staccato speech; no peripheral nerve affection, no sensory system affection, no sphincteric disturbance, no cognitive deterioration, no cranial nerve involvement; limb ataxia, wide base staggering gait, normal sensation, flexor planter response, normal tendon jerks, normal superficial reflexes |