Neurodevelopmental Disorder with Hypotonia and Variable Intellectual and Behavioral Abnormalities, is also known as nedhib. An important gene associated with Neurodevelopmental Disorder with Hypotonia and Variable Intellectual and Behavioral Abnormalities is POLR2A (RNA Polymerase II Subunit A). Affiliated tissues include brain and globus pallidus, and related phenotypes are generalized hypotonia and strabismus