Holoprosencephaly, also known as hpe, is related to holoprosencephaly 9 and hartsfield syndrome. An important gene associated with Holoprosencephaly is FGFR1 (Fibroblast Growth Factor Receptor 1), and among its related pathways/superpathways are Signal Transduction and Nervous system development. Affiliated tissues include Primitive Streak, brain and pituitary, and related phenotypes are abnormal facial shape and holoprosencephaly