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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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Imaging and Analysis of Tissue Orientation and Growth Dynamics in the Developing Drosophila Epithelia During Pupal Stages
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Three-dimensional epithelial morphogenesis in the developing Drosophila egg.

Miriam Osterfield1, Xinxin Du, Trudi Schüpbach

  • 1Lewis-Sigler Institute for Integrative Genomics, Princeton, NJ 08544, USA.

Developmental Cell
|March 2, 2013
PubMed
Summary
This summary is machine-generated.

Drosophila melanogaster eggshell appendage development reveals how 2D cell sheets form 3D tubes. This process involves tissue bending and cell intercalation driven by apical line tensions, as confirmed by computational modeling.

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Area of Science:

  • Developmental Biology
  • Cell Biology
  • Biophysics

Background:

  • The formation of complex 3D structures from 2D cell sheets is a fundamental process in developmental biology.
  • Drosophila melanogaster eggshell respiratory appendages serve as a model system for studying morphogenesis.
  • Understanding the cellular mechanisms driving tissue shaping is crucial for developmental studies.

Purpose of the Study:

  • To investigate the cellular and mechanical processes underlying the morphogenesis of Drosophila melanogaster eggshell appendages.
  • To elucidate the role of cell-cell interactions and tissue mechanics in transforming a 2D primordium into a 3D tubular structure.

Main Methods:

  • Live imaging and 3D image reconstruction of Drosophila melanogaster eggshell appendage development.
  • Analysis of cell type distribution, myosin, and Bazooka localization.
  • Computational modeling to simulate tissue deformation and cell rearrangement.

Main Results:

  • The transformation of the 2D appendage primordium into a 3D tube involves out-of-plane bending and spatially ordered cell intercalation.
  • Complementary distributions of myosin and Bazooka suggest a pattern of line tensions along apical cell-cell edges.
  • Computational models successfully replicate observed tissue deformation and cell rearrangement patterns.

Conclusions:

  • A 2D pattern of apical line tensions is sufficient to drive the observed 3D morphogenesis of Drosophila eggshell appendages.
  • The study provides a mechanistic explanation for tissue deformation and cell rearrangements during tube formation.
  • This work offers insights into the biophysical principles governing epithelial morphogenesis.