Modeling of Wnt-mediated tissue patterning in vertebrate embryogenesis.

Area of Science:

• Developmental biology
• Cell biology
• Systems biology

Background:

• Morphogens form concentration gradients crucial for embryonic patterning.
• Mechanisms of morphogen transport in dynamic tissues like the neural plate are not fully understood.

Purpose of the Study:

• To investigate Wnt morphogen transport by cytonemes versus diffusion in zebrafish neural plate patterning.
• To understand how stable cellular patterns emerge in dynamic embryonic environments.

Main Methods:

• Mutually complementary simulations and in vivo experiments.
• Analysis of Wnt transport mechanisms and their impact on cell fate and tissue patterning.
• Investigated concentration-dependent cell migration and apoptosis.

Main Results:

• Cytoneme-mediated Wnt transport establishes distinct Wnt thresholds earlier than diffusion.
• Stochasticity influences single-cell fate acquisition, leading to fluctuating pattern boundaries.
• Stable patterning is achieved through cell sorting and apoptosis, independent of transport.

Conclusions:

• Cytoneme-mediated Wnt transport is a favored mechanism for establishing morphogen gradients in rapidly expanding developmental systems.
• Directed cell sorting complements morphogen transport for robust pattern formation.
• Understanding these mechanisms is key to deciphering embryonic development.