Segment-specific adhesion as a driver of convergent extension

Area of Science:

• Developmental biology
• Computational modeling
• Cell biology

Background:

• Convergent extension shapes the embryonic body axis through multiscale cellular and tissue interactions.
• Maintaining pre-existing tissue patterns during convergent extension remains poorly understood.
• Some evidence suggests tissue patterns may actively drive convergent extension.

Purpose of the Study:

• To investigate how pre-existing tissue patterns are maintained during convergent extension.
• To explore the role of cell adhesion in preserving segmental patterns.
• To determine if differential cell adhesion can drive convergent extension.

Main Methods:

• A 2D Cellular Potts Model (CPM) was used to simulate prepatterned embryonic tissue.
• Simulations analyzed the impact of segment-specific cell adhesion on tissue patterning and extension.
• Model was extended to explore variations in tissue constraints and patterning.

Main Results:

• Convergent extension typically disrupts pre-existing segmental patterns.
• Preferential adhesion between cells of the same segment type preserves pattern integrity without hindering extension.
• Segment-specific adhesion alone is sufficient to drive convergent extension.
• Persistence of motion enhances convergent extension.
• Differential adhesion effects were confirmed in tissues with directional constraints and opposing adhesive gradients.

Conclusions:

• Differential cell adhesion is a key mechanism for maintaining tissue patterns during convergent extension.
• Segment-specific adhesion can actively drive convergent extension, a novel finding.
• Computational models are valuable for understanding complex developmental processes like convergent extension.