Exploiting Drosophila melanogaster Wing Imaginal Disc Eversion to Screen for New EMT Effectors

Area of Science:

• Developmental biology
• Cell biology
• Genetics

Background:

• A partial epithelial-mesenchymal transition (pEMT) is crucial during Drosophila melanogaster metamorphosis.
• This process occurs in the peripodial epithelium of wing imaginal discs.
• Disruption of pEMT leads to severe developmental defects, including internalized wings and thoracic tissue loss.

Purpose of the Study:

• To establish and utilize genetic screening methods to identify genes regulating the pEMT in Drosophila.
• To investigate the genetic interactions (enhancers and suppressors) involved in pEMT regulation.
• To develop and apply in vivo and ex vivo methods for analyzing pEMT dynamics and cellular behaviors.

Main Methods:

• Utilized peripodial GAL4 drivers, GAL80ts temporal control, and UAS RNAi transgenes for genetic screening.
• Employed dominant modifier tests to identify genetic enhancers and suppressors of pEMT.
• Visualized peripodial cells in vivo during pupal eversion using live markers.
• Analyzed pEMT ex vivo by culturing dissected wing discs with ecdysone to induce eversion and allow drug treatments.

Main Results:

• Established a genetic screen to identify genes critical for pEMT during Drosophila metamorphosis.
• Identified genetic modifiers that enhance or suppress pEMT-related phenotypes.
• Developed robust in vivo and ex vivo assays for detailed cellular and molecular analysis of pEMT.

Conclusions:

• The study provides a framework for discovering novel genes and pathways regulating epithelial-mesenchymal transition in development.
• The developed methodologies allow for precise temporal and spatial control and analysis of pEMT.
• This research facilitates a deeper understanding of the cellular mechanisms underlying morphogenesis and tissue remodeling.