Evolution of vertebrates as viewed from the crest

Area of Science:

• Evolutionary developmental biology
• Comparative genomics
• Cellular and molecular biology

Background:

• The origin of vertebrates coincided with the emergence of neural crest cells.
• Neural crest cells originate in the central nervous system and migrate to various locations.
• These cells differentiate into a wide array of derivatives, crucial for vertebrate development.

Purpose of the Study:

• To elucidate the evolutionary origins of the neural crest cell specification program.
• To understand how neural crest cells acquired multipotency and migratory capabilities.
• To analyze the gene regulatory network of neural crest cells as a model for vertebrate evolution.

Main Methods:

• Coupling morphological data from vertebrates and other chordates.
• Integrating gene regulatory information across species.
• Analyzing the topology of the neural crest gene regulatory network.

Main Results:

• The neural-crest-specification program likely enabled neural plate border cells to gain multipotency and migratory traits.
• The gene regulatory network provides a framework for understanding neural crest evolution.
• Insights into the elaboration of neural crest derivatives were gained.

Conclusions:

• The addition of the neural crest specification program was a key event in vertebrate evolution.
• The neural crest gene regulatory network serves as a valuable model for studying evolutionary processes.
• Further analysis of this network can illuminate the diversification of neural crest derivatives.