Neurodevelopmental Disorder with Hypotonia, Stereotypic Hand Movements, and Impaired Language, also known as chromosome 5q14.3 deletion syndrome, is related to chromosome 5q14.3 deletion syndrome, distal and 5q14.3 microdeletion syndrome, and has symptoms including seizures An important gene associated with Neurodevelopmental Disorder with Hypotonia, Stereotypic Hand Movements, and Impaired Language is MEF2C (Myocyte Enhancer Factor 2C), and among its related pathways/superpathways are Protein ubiquitination and Ubiquitination Cascade. Affiliated tissues include eye and brain, and related phenotypes are epileptic encephalopathy and abnormal periventricular white matter morphology