Ppp2r1a-Related Neurodevelopmental Disorder, also known as ppp2r1a-related neurodevelopmental disorders, is related to hypotonia and cerebellar atrophy, developmental delay, and seizures. An important gene associated with Ppp2r1a-Related Neurodevelopmental Disorder is PPP2R1A (Protein Phosphatase 2 Scaffold Subunit Aalpha). Affiliated tissues include brain.