Mar 7, 2013

Sox2 marks epithelial competence to generate teeth in mammals and reptiles

Development
E JuuriI Thesleff

Abstract

Tooth renewal is initiated from epithelium associated with existing teeth. The development of new teeth requires dental epithelial cells that have competence for tooth formation, but specific marker genes for these cells have not been identified. Here, we analyzed expression patterns of the transcription factor Sox2 in two different modes of successional tooth formation: tooth replacement and serial addition of primary teeth. We observed specific Sox2 expression in the dental lamina that gives rise to successional teeth in mammals with one round of tooth replacement as well as in reptiles with continuous tooth replacement. Sox2 was also expressed in the dental lamina during serial addition of mammalian molars, and genetic lineage tracing indicated that Sox2(+) cells of the first molar give rise to the epithelial cell lineages of the second and third molars. Moreover, conditional deletion of Sox2 resulted in hyperplastic epithelium in the forming posterior molars. Our results indicate that the Sox2(+) dental epithelium has competence for successional tooth formation and that Sox2 regulates the progenitor state of dental epithelial cells. The findings imply that the function of Sox2 has been conserved during evolution and that to...Continue Reading

  • References25
  • Citations78

Mentioned in this Paper

Tooth, Supernumerary
Blade - plant part
Squamous Transitional Epithelial Cell Count
Gene Deletion Abnormality
Epithelium
Subintima
Deletion Mutation
Molar Tooth
Founder Mice, Transgenic
Epithelial Cell Count (Procedure)

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