| Phenotype details |
delayed motor milestones; severe neurodevelopmental impairment; tetraparesis; epilepsy; axial hypotonia; normal deep tendon reflexes; myoclonus; tremor hands/jaws; abnormal hand movements; abnormal plantar reflexes; autistic behaviour; MRI brain hypomyelination, cortical gyral semplification, cerebellar atrophy, hypoplasia/agenesis corpus callosum; microcephaly, coarse face, high forehead, high temporal/frontal hairline, bitemporal narrowing, no palpebral ptosis, full cheeks, thick protruding lips, no macroglossia, thin sparse brittle hair, sparse eyebrows, sparse eyelashes, yellowish skin, no keratosis pilaris; normal vision; no strabismus; scoliosis or kyphoscoliosis; no pectus carinatum; normal extension elbow/knees; tapered fingers; pes planus; dysphagia |