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The force-sensitive protein Ajuba regulates cell adhesion during epithelial morphogenesis.

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The LIM-domain protein Ajuba stabilizes cell adhesion under tension during tissue development. This tension-sensitive recruitment is crucial for maintaining epithelial integrity and cell rearrangement in response to mechanical forces.

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Area of Science:

  • Cell Biology
  • Developmental Biology
  • Biophysics

Background:

  • Epithelial tissues remodel through cell reorganization driven by mechanical forces.
  • Maintaining cell adhesion under tension is critical during tissue morphogenesis but poorly understood.

Purpose of the Study:

  • To investigate the mechanisms regulating cell adhesion dynamics under mechanical tension during epithelial morphogenesis.
  • To identify proteins involved in sensing and responding to tension at adherens junctions.

Main Methods:

  • Utilized *Drosophila melanogaster* as a model organism for studying epithelial morphogenesis.
  • Investigated the localization and function of the LIM-domain protein Ajuba at adherens junctions.
  • Analyzed tension-dependent recruitment and stabilization roles of Ajuba using live imaging and genetic manipulation.

Main Results:

  • Ajuba is recruited to adherens junctions in a tension-dependent manner during axis elongation.
  • Force-sensitive localization of Ajuba requires its N-terminal and LIM domains.
  • Ajuba stabilizes adherens junctions under high tension and is essential for maintaining cell adhesion during cell rearrangement and epithelial closure.

Conclusions:

  • Ajuba plays a critical role in regulating cell adhesion in response to mechanical forces during epithelial morphogenesis.
  • Ajuba acts as a key mediator linking mechanical tension to the stabilization of cell-cell junctions.
  • Understanding Ajuba's function provides insights into tissue development and integrity maintenance.