Pontocerebellar Hypoplasia, Hypotonia, and Respiratory Insufficiency Syndrome, Neonatal Lethal, is also known as phrinl syndrome. An important gene associated with Pontocerebellar Hypoplasia, Hypotonia, and Respiratory Insufficiency Syndrome, Neonatal Lethal is ATAD3A (ATPase Family AAA Domain Containing 3A). Affiliated tissues include brain and skeletal muscle, and related phenotypes are spasticity and hypotonia