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Related Concept Videos

Gastrulation01:56

Gastrulation

Gastrulation establishes the three primary tissues of an embryo: the ectoderm, mesoderm, and endoderm. This developmental process relies on a series of intricate cellular movements, which in humans transforms a flat, “bilaminar disc” composed of two cell sheets into a three-tiered structure. In the resulting embryo, the endoderm serves as the bottom layer, and stacked directly above it is the intermediate mesoderm, and then the uppermost ectoderm. Respectively, these tissue strata will form...

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Assessing Signaling Properties of Ectodermal Epithelia During Craniofacial Development
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Published on: March 24, 2011

Large-scale clonal analysis reveals unexpected complexity in surface ectoderm morphogenesis.

Anne-Cécile Petit1, Jean-François Nicolas

  • 1Unité de Biologie Moléculaire du Développement, Institut Pasteur, Paris, France.

Plos One
|February 7, 2009
PubMed
Summary

Mouse embryo surface ectoderm (SE) development involves organized founder cells that establish head, trunk, and tail regions. These cells exhibit distinct behaviors, revealing spatial and temporal organization crucial for body plan formation.

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Area of Science:

  • Developmental Biology
  • Morphogenesis
  • Embryogenesis

Background:

  • Understanding embryonic development and morphogenetic processes is crucial for interpreting complex molecular data.
  • In vivo analysis of mouse embryo cell behavior is challenging due to in utero development and limitations in long-term culture.

Purpose of the Study:

  • To perform a large-scale clonal analysis of mouse embryo surface ectoderm (SE) during gastrulation and body plan establishment.
  • To elucidate the spatial and temporal organization of SE formation and precursor cell behaviors.

Main Methods:

  • Improved and combined two genetic methods for clonal analysis to enable large-scale production of labeled clones.
  • Conducted clonal analysis of surface ectoderm (SE) covering gastrulation and body plan establishment phases.

Main Results:

  • SE formation begins with a dorso-ventrally organized pool of founder cells at early gastrulation.
  • This pool is subsequently regionalized antero-posteriorly into head, trunk, and tail precursor pools.
  • Each precursor pool utilizes unique cell rearrangement and proliferation strategies for elongation, following a common clonal strategy of antero-posterior axis precursor arrangement.

Conclusions:

  • Morphogenetic processes are organized temporally and spatially within a posterior embryonic zone critical for elongation.
  • Surface ectoderm precursors are not equivalent, exhibiting diverse behaviors despite a common clonal origin and strategy.
  • Founder cells contributing exclusively to head and tail formation were identified, offering insights into bilaterian axial tissue origins.