| Phenotype details |
see paper; ..., 5y9m-delayed motor milestones, hypotonia (infancy), 18m-sit, 3y- wakl; profound speech delay, no expressive language, cannot perform activities daily living; no regression; 8m-GTC seizures, no tatus epilepticus; generalized hypotonia, preserved reflexes, no weakness, no spasticity, no dystonia, no ataxia; gait broad-based, frequent falls; no cranial nerve abnormalities, no sensory deficits, no dysmorphic features; 4y-MRI brain faint white matter signal alterations, incomplete myelination, non-specific bilateral thalamic signal abnormalities |