KANK1 and Pitt-Hopkins syndrome: Using a curated list of 484 genes directly implicated in ID (ID Project, University of Colorado Denver) we found two genes: KN Motif And Ankyrin Repeat Domains 1 (KANK1), associated with cerebral palsy [40], and Transcription factor 4 (TCF4), associated with Pitt-Hopkins Syndrome [41].