AP4E1 and Intellectual disability: It is worth noting that 18 genes (e.g., AP4E1, FSHR, and COL11A2) are related to the terms of “short stature” and “body height.” Mutations in the AP4E1 gene are associated with neurodevelopmental disorders in humans, which are characterized by intellectual disability, global developmental delay, and short stature (Jamra et al., 2011; Moreno-De-Luca et al., 2011).