Patient 33, who was hemizygous for a pathogenic FOXP3 variant, also had an atypical clinical course for IPEX syndrome (Immune dysregulation, Polyendocrinopathy, Enteropathy, X‐linked), and did not have any of the classical features of this condition31 other than diabetes, although it is possible that these would have developed if the child had survived. Here, FOXP3 is linked to diabetes mellitus.