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This study presents a new theory explaining how single-layer tissues in early embryos form complex shapes. It models tissue deformation using fluid dynamics and cell mechanics, successfully reproducing key developmental events.

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Area of Science:

  • Developmental Biology
  • Biophysics
  • Theoretical Biology

Background:

  • Early embryonic development involves significant tissue shape changes (morphogenesis) driven by epithelial cell dynamics.
  • Understanding the physical principles governing these shape changes is crucial for comprehending organismal anatomy formation.

Purpose of the Study:

  • To develop a covariant active-hydrodynamic theory for monolayer morphogenesis.
  • To explain how tissue-scale deformations emerge from cell-level mechanics and fluid interactions.

Main Methods:

  • Formulated a theoretical framework balancing fluid dynamics (low-Reynolds number embedding fluid) with cell-autonomous stresses.
  • Incorporated apical contractile stresses and elastic responses under constant cell volume constraints.
  • Analyzed hydrodynamic instabilities, including passive buckling and active deformation.

Main Results:

  • The theory describes cell shape changes like 'squamous to columnar' and 'regular-prism to truncated-pyramid'.
  • These deformations qualitatively replicate in vivo observations of mesoderm and posterior midgut invaginations during gastrulation.
  • The model successfully reproduces key developmental events in Drosophila melanogaster.

Conclusions:

  • The active-hydrodynamic theory provides a unified framework for understanding monolayer morphogenesis.
  • The model highlights the interplay between cell mechanics and the surrounding fluid environment in driving tissue deformation.
  • This work offers insights into the physical basis of early embryonic anatomical development.