Holoprosencephaly 3, also known as hpe3, is related to holoprosencephaly 1 and holoprosencephaly. An important gene associated with Holoprosencephaly 3 is SHH (Sonic Hedgehog Signaling Molecule), and among its related pathways/superpathways are Signaling by Hedgehog and Wnt / Hedgehog / Notch. Affiliated tissues include brain and liver, and related phenotypes are intellectual disability and global developmental delay