Polarization and migration in the zebrafish posterior lateral line system

Area of Science:

• Developmental Biology
• Cell Biology
• Computational Biology

Background:

• Collective cell migration is crucial for embryonic development.
• The posterior lateral line primordium (PLLP) in zebrafish exemplifies this process, involving coordinated movement of approximately 100 cells.
• Understanding the underlying molecular and physical mechanisms is key to deciphering developmental processes.

Purpose of the Study:

• To model the collective cell migration of the posterior lateral line primordium (PLLP) in zebrafish embryos.
• To investigate the role of the FGF-Wnt signaling network and cell-cell interactions in guiding PLLP motility.
• To link signaling pathways to cellular behaviors using a 3D simulation framework.

Main Methods:

• Development of a 3D cell-based simulation incorporating realistic cell adhesion, interaction forces, and chemotaxis.
• Modeling of a mutually inhibitory FGF-Wnt signaling network within the PLLP.
• Linking tissue subdivision to receptor-ligand parameters and simulating cell movement up a CXCL12a gradient.

Main Results:

• The model successfully reproduced experimentally observed PLLP motility patterns.
• Leading cells were shown to migrate up a CXCL12a gradient, while trailing cells exhibited chemotaxis towards FGF secreted by leading cells.
• The 3D simulation framework accurately predicted the behavior of both control and mutant phenotypes.

Conclusions:

• The study provides a mechanistic understanding of collective cell migration driven by signaling networks and physical forces.
• The 3D simulation approach is a powerful tool for investigating complex biological processes like embryonic development.
• This work elucidates the interplay between signaling pathways, cell behaviors, and tissue morphogenesis during development.