The Wolf-Hirschhorn syndrome is a rare genetic disorder caused by a microdeletion in the chromosomal region 4p16.3. Typical symptoms are a distinct facial morphology, intellectual disability, psychiatric disorders, seizures, and heart defects. The chromosomal position chr4:1,552,030-2,091,303 (GCRh37) was taken from Kirov et al. 2014 and literature cited there (10.1016/j.biopsych.2013.07.022).