title: Transient expression of the bHLH factor neurogenin-2 marks a subpopulation of neural crest cells biased for a sensory but not a neuronal fate.
abstract: Lineage-tracing experiments have indicated that some premigratory neural crest cells (NCCs) are pleuripotent, generating sensory and sympathetic neurons and their associated glia. Using an inducible Cre recombinase-based fate mapping system, we have permanently marked a subpopulation of NCCs that expresses Ngn2, a bHLH transcription factor required for sensory neurogenesis, and compared its fate to the bulk NCC population marked by expression of Wnt1. Ngn2(+) progenitors were four times more likely than Wnt1(+) NCCs to contribute to sensory rather than sympathetic ganglia. Within dorsal root ganglia, however, both Ngn2- and Wnt1-expressing cells were equally likely to generate neurons or glia. These data suggest that Ngn2 marks an NCC subpopulation with a predictable fate bias, early in migration. Taken together with previous work, these data suggest that NCCs become restricted to sensory or autonomic sublineages before becoming committed to neuronal or glial fates.
authors.affiliation: Division of Biology 216-76, Howard Hughes Medical Institute, California Institute of Technology, Pasadena, CA 91125, USA.
authors.forename: Mariela
authors.initials: M
authors.lastname: Zirlinger
authors.forename: Liching
authors.initials: L
authors.lastname: Lo
authors.forename: Jill
authors.initials: J
authors.lastname: McMahon
authors.forename: Andrew P
authors.initials: AP
authors.lastname: McMahon
authors.forename: David J
authors.initials: DJ
authors.lastname: Anderson
mesh_terms: D000818:Animals; D051792:Basic Helix-Loop-Helix Proteins; D002454:Cell Differentiation / Q000502:physiology*; D018507:Gene Expression Regulation, Developmental; D018257:Helix-Loop-Helix Motifs; D051379:Mice; D008810:Mice, Inbred C57BL; D009419:Nerve Tissue Proteins / Q000235:genetics*; D009432:Neural Crest / Q000166:cytology / Q000502:physiology*; D009474:Neurons / Q000166:cytology / Q000502:physiology*; D014157:Transcription Factors / Q000235:genetics
chemical_list: D051792:Basic Helix-Loop-Helix Proteins; D009419:Nerve Tissue Proteins; D014157:Transcription Factors; C102938:Neurog2 protein, mouse