Expression analysis of candidate genes regulating successional tooth formation in the human embryo

Human dental development is characterized by formation of primary teeth, which are subsequently replaced by the secondary dentition. The secondary dentition consists of incisors, canines, and premolars, which are derived from the successional dental lamina of the corresponding primary tooth germs; a...

Full description

Saved in:

Bibliographic Details
Published in:	Frontiers in physiology Vol. 5; p. 445
Main Authors:	Olley, Ryan C, Olley, Ryan, Xavier, Guilherme M, Seppala, Maisa, Volponi, Ana A, Geoghegan, Fin, Sharpe, Paul T, Cobourne, Martyn T
Format:	Journal Article
Language:	English
Published:	Switzerland Frontiers Media S.A 21-11-2014
Subjects:	GAS1 Gene Expression Human tooth development Physiology RUNX2 SPROUTY2 three-dimensional reconstruction SPROUTY2 successional dental lamina primary dental lamina GAS1 human tooth development RUNX2 gene expression three-dimensional reconstruction
Online Access:	Get full text
Tags:	Add Tag No Tags, Be the first to tag this record!

Description
Summary:	Human dental development is characterized by formation of primary teeth, which are subsequently replaced by the secondary dentition. The secondary dentition consists of incisors, canines, and premolars, which are derived from the successional dental lamina of the corresponding primary tooth germs; and molar teeth, which develop as a continuation of the dental lamina. Currently, very little is known about the molecular regulation of human successional tooth formation. Here, we have investigated expression of three candidate regulators for human successional tooth formation; the Fibroblast Growth Factor-antagonist SPROUTY2, the Hedgehog co-receptor GAS1 and the RUNT-related transcription factor RUNX2. At around 8 weeks of development, only SPROUTY2 showed strong expression in both epithelium and mesenchyme of the early bud. During the cap stage between 12-14 weeks, SPROUTY2 predominated in the dental papilla and inner enamel epithelium of the developing tooth. No specific expression was seen in the successional dental lamina. GAS1 was expressed in dental papilla and follicle, and associated with mesenchyme adjacent to the primary dental lamina during the late cap stage. In addition, GAS1 was identifiable in mesenchyme adjacent to the successional lamina, particularly in the developing primary first molar. For RUNX2, expression predominated in the dental papilla and follicle. Localized expression was seen in mesenchyme adjacent to the primary dental lamina at the late cap stage; but surprisingly, not in the early successional lamina at these stages. These findings confirm that SPROUTY2, GAS1, and RUNX2 are all expressed during early human tooth development. The domains of GAS1 and RUNX2 are consistent with a role influencing function of the primary dental lamina but only GAS1 transcripts were identifiable in the successional lamina at these early stages of development.
Bibliography:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 Reviewed by: Amel Gritli-Linde, University of Gothenburg, Sweden; Siew-Ging Gong, University of Toronto, Canada; Claudio Cantù, University of Zurich, Switzerland Edited by: Thimios Mitsiadis, University of Zurich, Switzerland This article was submitted to Craniofacial Biology, a section of the journal Frontiers in Physiology.
ISSN:	1664-042X 1664-042X
DOI:	10.3389/fphys.2014.00445