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Area of Science:

  • Developmental Biology
  • Cell Biology
  • Biophysics

Background:

  • Epithelial tissue flows are crucial for embryonic development and morphogenesis.
  • The mechanical properties of embryonic epithelial tissues and the factors governing them are not fully understood.
  • Actomyosin contractility influences cell and cytoskeletal network mechanics, but its in vivo role in embryonic tissue dynamics is unclear.

Purpose of the Study:

  • To investigate how actomyosin-dependent tensions influence the mechanical properties and flow dynamics of embryonic epithelial tissues.
  • To dissect the role of cell-generated tensions in regulating tissue mechanics during embryonic development.

Main Methods:

  • Utilized optogenetic tools for precise spatiotemporal manipulation of actomyosin contractility in the Drosophila germband epithelium.
  • Quantified changes in tissue mechanical properties, cell rearrangements, and tissue-level flows in response to altered actomyosin activity.

Main Results:

  • Optogenetic manipulation of actomyosin contractility significantly altered the solid-fluid mechanical properties of the germband epithelium.
  • Increased actomyosin activation led to higher overall tension but decreased tension anisotropy, resulting in more solid-like tissue properties and reduced flow.
  • Decreased actomyosin activity reduced both tension level and anisotropy, leading to more solid-like properties than wild-type but less so than activation.

Conclusions:

  • Epithelial tissue flow during embryogenesis is controlled by actomyosin-dependent regulation of tissue mechanical properties.
  • Tissue mechanics are modulated by tension levels and anisotropy: isotropic tension promotes solid-like behavior, while anisotropic tension promotes fluidization.
  • Coordinated regulation of actomyosin activity is essential for rapid tissue remodeling during embryonic development.