Patrilocal* cell-cell interactions: sevenless captures its bride

Area of Science:

• Developmental biology
• Cell signaling
• Neuroscience

Background:

• R7 neuron development in Drosophila's compound eye is crucial for visual processing.
• This development relies on cell-cell communication between R8 photoreceptor and R7 precursor cells.
• Key signaling molecules involved are the sevenless (sev) receptor tyrosine kinase and its ligand, bride of sevenless (boss).

Purpose of the Study:

• To investigate the molecular mechanisms underlying R7 neuron induction.
• To understand the role of the sevenless/bride of sevenless signaling pathway.
• To explore the unusual nature of the boss protein as a receptor tyrosine kinase ligand and its internalization.

Main Methods:

• Utilized genetic analysis in Drosophila melanogaster.
• Investigated protein-protein interactions using cell biology techniques.
• Examined the localization and internalization of signaling proteins.

Main Results:

• Confirmed that sevenless (sev) on R7 precursor cells and bride of sevenless (boss) on R8 neurons mediate R7 development.
• Demonstrated the unusual structure of boss, a transmembrane protein with a large extracellular domain acting as a ligand.
• Observed the intriguing internalization of the boss protein into the R7 cell post-sev interaction.

Conclusions:

• The sev-boss pathway is essential for R7 neuron specification in Drosophila.
• The boss protein's unique structure and internalization represent a novel mode of receptor tyrosine kinase ligand action.
• Further research into boss internalization may reveal new insights into cell signaling and developmental processes.