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Embryonic holoprosencephaly: pathology and phenotypic variability.

Shigehito Yamada1

  • 1Congenital Anomaly Research Center, Kyoto University Graduate School of Medicine, Kyoto 606-8501, Japan. shyamada@cac.med.kyoto-u.ac.jp

Congenital Anomalies
|November 14, 2006
PubMed
Summary

Holoprosencephaly (HPE) is a major brain anomaly resulting from incomplete prosencephalon cleavage. This study examines over 200 HPE embryos, detailing facial and brain abnormalities and their developmental variations.

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Area of Science:

  • Developmental biology
  • Embryology
  • Neuroscience

Background:

  • Holoprosencephaly (HPE) is a significant congenital brain anomaly.
  • It arises from the failure of the forebrain (prosencephalon) to divide properly during early embryonic development.
  • Understanding HPE is crucial for insights into craniofacial development.

Purpose of the Study:

  • To analyze the pathology and phenotypic variability of Holoprosencephaly (HPE) in human embryos.
  • To correlate embryonic HPE classifications with postnatal cases.
  • To discuss embryopathological aspects of HPE development.

Main Methods:

  • Gross and histological observation of over 200 Holoprosencephaly (HPE) cases from the Kyoto Collection of Human Embryos.
  • Classification of facial anomalies based on Carnegie stages (CS).
  • Review of recent molecular mechanisms and genetic findings in HPE.

Main Results:

  • Facial anomalies in HPE embryos after CS 18 align with classical classifications (cyclopia, ethmocephaly, etc.).
  • HPE embryos at CS 13-17 exhibit distinct facial features compared to older embryos.
  • Pathology and phenotypic variability were analyzed from an embryopathological perspective.

Conclusions:

  • Embryopathological analysis reveals distinct facial phenotypes in early HPE development.
  • HPE research, including genetic studies, offers insights into normal and abnormal craniofacial development.
  • The study highlights the importance of embryological stage in HPE manifestation.