Holoprosencephaly 5, also known as hpe5, is related to huntington disease-like 1 and spinocerebellar ataxia 31. An important gene associated with Holoprosencephaly 5 is ZIC2 (Zic Family Member 2), and among its related pathways/superpathways is Ciliopathies. Affiliated tissues include brain, and related phenotypes are lateral ventricle dilatation and syntelencephaly