Notch controls cell adhesion in the Drosophila eye

Area of Science:

• Developmental Biology
• Cell Biology
• Genetics

Background:

• Notch signaling's role in cell adhesion is suggested but mechanistically unclear.
• Epithelial remodeling in the Drosophila eye involves primary pigment cells (PPCs) enwrapping cone cells.

Purpose of the Study:

• To elucidate the mechanism by which Notch signaling influences cell adhesion during Drosophila eye development.
• To investigate Notch's role in the epithelial remodeling process involving PPCs and cone cells.

Main Methods:

• Analysis of gene expression (Delta, Notch, hibris, sns, rst) in developing Drosophila eyes.
• Manipulation of Notch signaling and adhesion molecule expression in specific cell types.
• Observation of cellular morphology and cell-cell interactions.

Main Results:

• Notch activation in PPC precursors is induced by Delta in cone cells, promoting enwrapping.
• Notch signaling differentially regulates the expression of adhesion molecules hibris (hbs), sns, and rst.
• Loss or misexpression of hbs, sns, or rst disrupts PPC enwrapping and cell shape.

Conclusions:

• Notch signaling is crucial for instructing PPCs to enwrap cone cells in the Drosophila eye.
• Notch controls epithelial remodeling by modulating the expression and function of specific adhesion molecules.
• This study reveals a novel mechanism of Notch-mediated cell adhesion and tissue patterning.