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Fallet‐Bianco, Catherine
American journal of medical genetics. Part C, Seminars in medical genetics, June 2018, 2018-06-00, 20180601, Volume: 178, Issue: 2Journal Article
Holoprosencephaly (HPE) is a primary disorder of neural induction and patterning of the rostral neural tube resulting in noncleavage of the forebrain with failure to form two separate distinct hemispheres. The spectrum of HPE is very broad and encompasses various neuropathological phenotypes of different severity. The recent literature has demonstrated that the phenotypic variability of HPE ranges from aprosencephaly–atelencephaly, at the most severe end, to milder forms such as the “middle interhemispheric variant” of HPE at the less severe end of the spectrum. Between them, different intermediate forms demonstrate a continuum in a wide phenotypic spectrum rather than well‐defined categories. Although the term “HPE” suggests a disorder affecting only the prosencephalon, other brain structures are involved, underlining the complexity of the malformation. Because of close spatiotemporal interactions and common signaling pathways contributing to the development of both brain and face, concomitant facial and ocular anomalies are associated with brain malformation. In this review, the characteristic neuropathological features of the various forms of HPE are described as well as their associated brain, face, and ocular malformations, to delineate the different phenotypes.
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