| Phenotype details |
see paper; ..., no microcephaly; no short stature; walking not yet achieved; intellectual disability; developmental delay; speech not yet achieved; intractable tonic seizures; hypotonia; Rett-like features (repetitive hand movements), decreased limb and hand movement during early adolescence; cortical visual impairment; normal hearing; midface retrusion, a flat nasal bridge, telecanthus (increased inner eyelids distance), upturned upper lip, low-set ear; dysphagia, G-tube; no autism spectrum disorder, inappropriate laughter, self-stimulatory behavior; sleep pattern impairment; scoliosis, decreased since middle childhood; MRI brain cerebral, cerebellar atrophy, thin corpus callosum; Early childhood: frequent high-voltage slow wave bursts in the bilateral central regions awake, early adolescence: independent spikes in the bilateral frontal region during sleep |