Neurodevelopmental disorders related to protein phosphatase 2A (PP2A) have been recently renamed as Houge-Janssens syndrome and they are caused by heterozygous, de novo pathogenic genetic variants in the PPP2R5D, PPP2R1A or PPP2CA genes. The syndrome is characterized by features such as intellectual disability, autism, developmental delay, seizures or brain abnormalities, among others.