Mondo Description A rare, genetic, syndromic intellectual disability characterized by usually profound intellectual disability with absent speech, severe infantile hypotonia with decreased or absent reflexes, markedly slow motor development (with no progress beyond the ability to sit independently), early-onset epilepsy, strabismus and post-natal onset of progressive brain atrophy (incl. loss of brain volume, ex vacuo ventriculomegaly, dysgenesis of corpus callosum, white matter abnormalities ranging from non-specific changes to leukodystrophy). Swallowing difficulties, respiratory insufficiency, osteoporosis and variable craniofacial dysmorphisms (incl. plagio/brachicephaly, bitemporal narrowing, high-arched eyebrows, high nasal bridge, anteverted nares, high palate, tented upper lip) may constitute additional clinical features.

Uniprot Description An autosomal recessive neurodevelopmental disorder characterized by profound developmental disability, intellectual disability and severe hypotonia. Many patients have seizures, and show brain atrophy, dysgenesis of the corpus callosum and white-matter changes on neuroimaging. Non-specific facial dysmorphism is noted in some individuals.