EPG5 and Parkinson disease: In addition, two particularly severely affected siblings (90.1 and 90.2) compound heterozygous for EPG5 variants c.5869+1G>A and p.Trp1989Ter presented with myoclonus from birth, followed by dystonia from four weeks, early‐onset parkinsonism at three months, progressive infantile epileptic encephalopathy, and death in late infancy.