A disorder characterized onset at birth of profound encephalopathy with hypotonia, Respiratory insufficiency central hypoventilation, a persistent suppression burst pattern of EEG background, and recurrent bouts of myoclonus that are not accompanied by epileptic discharges on electroencephalography. Evolution to pharmacoresistant seizures is common and continued profound global developmental delay. [ https://clinicalgenome.org/affiliation/40005/ ]