Neurodevelopmental Disorder with Dysmorphic Features, Spasticity, and Brain Abnormalities, is also known as glycosylphosphatidylinositol biosynthesis defect 9. An important gene associated with Neurodevelopmental Disorder with Dysmorphic Features, Spasticity, and Brain Abnormalities is PGAP1 (Post-GPI Attachment To Proteins Inositol Deacylase 1). Affiliated tissues include brain and skeletal muscle, and related phenotypes are spasticity and hyperreflexia