| Phenotype details |
see paper; ..., profound developmental delay, intellectual disability, non-syndromic epileptic encephalopathy, early brain atrophy, no speech, bedridden, no sleep disturbance, age at regression 1y4m, no Rett-like features, spasticity quadriparesis, hypotonia, no extrapyramidal signs, optic disc atrophy, no microcephaly, 14m-epilepsy, MRI brain atrophy, no myelination delay, 3y-no iron deposition T2WI |