The neural crest is a uniquely vertebrate cell type that is thought to have played an important role in vertebrate evolution by forming peripheral ganglia and jaws, thus facilitating predation and expansion of the brain. We recently identified a ?cranial-specific? neural crest transcriptional subcircuit in jawed vertebrates (gnathostomes) that imbues this neural crest population with the unique ability, absent from trunk neural crest, to form craniofacial cartilage that is critical for jaw formation. Here, we propose to examine whether homologous genes are expressed in the cranial premigratory neural crest of lamprey, a jawless basal vertebrate (agnathan). Our preliminary results suggest that many of these genes are ?missing? from the lamprey's premigratory cranial neural crest, thus challenging the hypothesis that invention of neural crest in vertebrates gave rise to a ?New Head?. Accordingly, we hypothesize that there was progressive expansion of neural crest derivatives during the course of vertebrate evolution. This likely occurred by addition of new enhancer elements into the premigratory neural crest that conferred novel developmental potential onto this cell population. As case in point, lamprey lack a vagal neural crest that in gnathostomes forms the enteric nervous system. To test this hypothesis, we will perform lineage analysis, analyze transcription factors and regulatory regions of selected genes across agnathan and gnathostomes. We will identify putative enhancers, dissect their regulatory inputs, and test the ability of these regions to drive reporter expression in lamprey as well as cross-species, in the zebrafish. The results promise to elucidate how new cell types arose during vertebrate evolution under the umbrella of the neural crest.
In all vertebrate embryos, the neural crest gives rise to the sensory, autonomic and enteric nervous system, craniofacial skeleton and melanocytes of the skin. Not only does the neural crest have the capacity to form an amazing number of embryonic cell types, but also neural crest stem cells persist in adult tissue. For example, a population of these cells, called Schwann cell precursors, have been found closely associated with peripheral nerves and are present throughout the body, where they have been shown to differentiate into various derivatives including neurons, glia and pigment cells. Because neural crest cells are involved in a variety of birth defects such as Hirschsprung's disease, cleft palate and various types of cancers, like neuroblastoma, melanoma and pheochromocytoma, the results of this proposal regarding neural crest cell diversification across vertebrates will provide important understanding of the normal development of these cells that can later lead to disease states.
