KIF14 (OMIM ID: 611279) and CEP55 (OMIM ID: 610000), like CIT, are recessively inherited etiologies of microcephaly, whereas variants in PPP1R12A (OMIM ID: 602021) are responsible for a de novo dominant form of a holoprosencephaly spectrum that includes individuals with microcephaly (53–55). The gene discussed is CEP55; the disease is holoprosencephaly.