Holoprosencephaly 4, also known as hpe4, is related to corpus callosum lipoma and cerebral hemisphere lipoma. An important gene associated with Holoprosencephaly 4 is TGIF1 (TGFB Induced Factor Homeobox 1), and among its related pathways/superpathways are Signaling by TGFB family members and Mesodermal commitment pathway. Affiliated tissues include brain, and related phenotypes are ptosis and depressed nasal bridge