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doi: 10.1242/10.1242/dev.00213
1 Neurobiotechnology Center and Department of Neuroscience, Ohio State
University, 105 Rightmire Hall, 1060 Carmack Road, Columbus, OH 43210,
USA
2 Department of Pathology, Centre Medical Universitaire 1, Rue Michel-Servet,
1211 Geneva 4, Switzerland
* Author for correspondence (e-mail: henion.1{at}osu.edu)
Accepted 8 October 2002
Clonal and lineage analyses have demonstrated that although some neural crest cells have the ability to generate multiple cell types and display self-renewal ability, other crest cells generate a single or limited repertoire of cell types. However, it is not yet clear when, and in what order, crest cells become specified to adopt a particular fate. We report that the receptor tyrosine kinases TrkC and C-Kit are expressed by distinct neural crest subpopulations in vitro. We then analyzed the lineages of individual receptor-expressing crest cells and found that TrkC-expressing cells that have just emerged from the neural tube give rise to clones containing neurons or glial cells, or both, but never produce melanocytes. A short time later, TrkC-expressing cells only generate pure neuronal clones. By contrast, from their earliest appearance in neural tube outgrowths, C-Kit-expressing cells invariably give rise to clones containing only melanocytes. Our results directly demonstrate that distinct neurogenic and melanogenic sublineages diverge before or soon after crest cells emerge from the neural tube, that fate-restricted precursors are present in nascent neural crest populations and that these sublineages can be distinguished by their cell type-specific expression of receptor tyrosine kinases.
Key words: Neural crest, Clonal analysis, Lineage, TrkC, C-Kit, Neurogenic, Melanogenic, Quail
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