| Phenotype details |
see paper; ..., no facial dysmorphism; no axial hypotonia; no speech delay; 10y-lost ambulation; 7y-regression onset; dystonia; ataxia; spastic tetraparesis, dysarthria, nystagmus, ophthalmoplegia, dysphagia, myoclonic jerk; no seizure; EEG normal; atrophy |