A multi-cell, multi-scale model of vertebrate segmentation and somite formation

Area of Science:

• Developmental biology
• Evolutionary developmental biology
• Biophysics

Background:

• Somitogenesis, the formation of vertebrate body segments, requires multi-scale biological coordination.
• Current understanding relies on independently studied mechanisms, hindering a holistic view.

Purpose of the Study:

• To test and integrate prevailing hypotheses of somitogenesis.
• To build a comprehensive clock-and-wavefront model for simulating vertebrate segmentation.

Main Methods:

• Developed an integrated model incorporating intracellular segmentation clock, Delta/Notch signaling, FGF8 determination front, and cell sorting.
• Performed 2D simulations with defined initial conditions.

Main Results:

• The model robustly generates spatially and temporally regular somites and realistic morphologies.
• Identified anterior-traveling Lfng stripes as pseudo-waves, not true propagating waves.
• Demonstrated model flexibility in simulating interspecies variation in somite size and Lfng stripe patterns.

Conclusions:

• The integrated model reconciles inconsistencies and identifies gaps in current somitogenesis hypotheses.
• The model provides a framework for understanding the coordination of segmentation mechanisms across scales.
• Novel submodels and extensions were proposed to enhance explanatory power.