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Related Experiment Videos

Dynamic morphogenetic events characterize the mouse visceral endoderm.

Jaime A Rivera-Pérez1, Jesse Mager, Terry Magnuson

  • 1Department of Genetics, University of North Carolina, 103 Mason Farm Road, Chapel Hill, NC 27599-7264, USA.

Developmental Biology
|September 23, 2003
PubMed
Summary

The visceral endoderm, specifically Hex-expressing cells, forms a distinct thickening (VET) crucial for patterning the rostral neural structures in developing mouse embryos. This VET region acts as an early landmark for the anterior-posterior axis.

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Area of Science:

  • Developmental Biology
  • Embryology
  • Neuroscience

Background:

  • The extraembryonic endoderm is implicated in vertebrate rostral neural development.
  • Neural inductive signals in mice are hypothesized to originate from Hex-expressing visceral endoderm.

Purpose of the Study:

  • To conduct a morphological and lineage analysis of visceral endoderm cells during pre- and post-primitive streak stages.
  • To investigate the role of Hex-expressing cells in early mouse embryonic development and axis formation.

Main Methods:

  • Morphological analysis of visceral endoderm cells.
  • Lineage tracing using intracellular labeling.
  • Staging of mouse embryos based on morphological landmarks.

Main Results:

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  • Hex-expressing cells form a tall, columnar epithelial thickening (VET) overlying the epiblast.
  • The VET is positioned to define the anterior-posterior axis of the epiblast.
  • VET cells exhibit an anterior and anterolateral shift, forming a crescent by early gastrulation.
  • VET descendants are found along the embryonic/extraembryonic boundary by headfold stages.

Conclusions:

  • The VET region and its Hex-expressing cells serve as crucial morphological landmarks for staging mouse embryos.
  • The positioning and migration of VET cells suggest a conserved mechanism for rostral neurectoderm patterning across amniotes.