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Patterned Contractile Forces Promote Epidermal Spreading and Regulate Segment Positioning during Drosophila Head

Natalia Dorota Czerniak1, Kai Dierkes1, Arturo D'Angelo1

  • 1Cell and Developmental Biology Programme, Centre for Genomic Regulation (CRG), The Barcelona Institute of Science and Technology, Doctor Aiguader 88, Barcelona 08003, Spain; Universitat Pompeu Fabra (UPF), Barcelona 08003, Spain.

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Epithelial spreading during Drosophila head involution is driven by actomyosin forces at the leading edge and a tension gradient within segments. This mechanism controls tissue movement and positioning for proper organ development.

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Area of Science:

  • Developmental Biology
  • Cell Biology
  • Biophysics

Background:

  • Epithelial spreading is crucial for animal development and wound healing.
  • It involves collective cell migration or actomyosin forces at the leading edge.
  • Drosophila head involution (HI) provides a model for studying epithelial spreading.

Purpose of the Study:

  • To quantitatively analyze tissue spreading during Drosophila head involution.
  • To identify the driving forces behind epidermal movement and segment positioning.
  • To investigate the role of actomyosin tension and signaling pathways in this process.

Main Methods:

  • High-resolution live microscopy
  • Laser microsurgery
  • Genetic perturbations
  • Quantitative analysis of tissue dynamics

Main Results:

  • Epidermal movement is driven by both leading-edge actomyosin cables and circumferential tension gradients within segments.
  • Hedgehog (Hh) signaling modulates the tension gradient, involving polarity genes.
  • Disrupting contractile forces alters segment widths and causes mispositioning.

Conclusions:

  • Patterned circumferential tensions generate propelling forces for epithelial spreading and positioning.
  • This study reveals a mechanism of tensile force regulation in epithelial tissue dynamics.
  • Findings contribute to understanding tissue morphogenesis and development.