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Lef1 may contribute to agenesis of the third molars in mice

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DOI: 10.4236/ojst.2013.35047    3,197 Downloads   4,523 Views  

ABSTRACT

Tooth agenesis is the most common developmental anomaly of the human dentition. Epilepsy-like disorder (EL) mice, which have a 100% incidence of agenesis of the third molars, may be a good model for the genetic study of human tooth agenesis. Our previous congenic breeding strategy using EL mice confined a major locus for agenesis of M3, designated am3, within an approximately 1 Mega base pair (Mbp) interval on chromosome 3, which contains five known genes; Lef1, Hadh, Cyp2u1, Sgms2 and Papss1. The aim of this study was to identify the strongest candidate for am3 among the five genes using real-time PCR analysis. The tooth germs of M3 in the bud stage of EL and control mice were dissected out, and total RNA was extracted. In real-time PCR analysis, a significantly low level of expression of Lef1, which is one of the essential transcription factors for early tooth development, was observed in M3 of EL mice. In addition, a significantly low level of expression of Fgf4, which is a direct transcriptional target for LEF1 in early tooth development, was observed in M3 of EL mice. Our results suggest that the cause of M3 agenesis of EL mice may be a low level of Lef1 expression in M3 in the bud stage of EL mice.

Conflicts of Interest

The authors declare no conflicts of interest.

Cite this paper

Shimizu, T. , Ichinosawa, T. , Kiguchi, Y. , Ishida, F. and Maeda, T. (2013) Lef1 may contribute to agenesis of the third molars in mice. Open Journal of Stomatology, 3, 281-286. doi: 10.4236/ojst.2013.35047.

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