Fidelity in planar cell polarity signalling

Area of Science:

• Developmental Biology
• Cell Biology
• Genetics

Background:

• Drosophila wing hairs exhibit precise distal polarity, forming a near-perfect parallel array.
• This cellular organization is crucial for proper tissue development and function.
• The planar cell polarity (PCP) signaling pathway is known to regulate this process.

Purpose of the Study:

• To elucidate the molecular mechanisms underlying the high fidelity of Drosophila wing hair polarity.
• To investigate the interaction between different tiers of the PCP signaling pathway.

Main Methods:

• Analysis of the roles of the cadherin Fat and the receptor Frizzled in PCP signaling.
• Investigating intercellular feedback loops and signal transduction within wing epithelial cells.

Main Results:

• The study reveals a two-tier PCP mechanism controlling wing hair polarity.
• The Fat cadherin establishes global orientation, while Frizzled mediates local cell-cell alignment via feedback.
• The Frizzled feedback loop can correct errors, ensuring robust and accurate polarity across the tissue.

Conclusions:

• The interaction between Fat and Frizzled pathways ensures highly accurate and robust wing hair polarity.
• This cooperative cell alignment mechanism allows for error correction, leading to virtually error-free arrays.