Abstract
Signaling from the endothelin-A (Ednra) receptor is responsible for initiating multiple signaling pathways within neural crest cells (NCCs). Loss of this initiation is presumably the basis for the craniofacial defects observed in Ednra−/− embryos. However, it is not known whether continued Ednra signaling in NCC derivatives is required for subsequent development of the lower jaw. To address this question, mice containing loxP recombination sequences flanking a portion of the Ednra gene were bred with transgenic mice that express Cre recombinase under control of a Dlx5/6 enhancer element. We find that while Ednra gene inactivation within the mandibular arch of these Ednra conditional knockout embryos is detectable by embryonic day (E) 10.5, mandibular arch-specific gene expression is normal, as is overall mandible development. These results suggest that while Ednra receptor signaling is crucial for early NCC patterning, subsequent Ednra signaling is not essential for mandible bone development.
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Acknowledgements
The authors would like to thank Shelley Dixon and Tinisha Taylor for technical assistance. M.Y. is an investigator of the Howard Hughes Medical Institute. R.M.K is a trainee in the Medical Scientist Training Program at the University of Texas Southwestern Medical Center at Dallas. D.E.C. is a recipient of a Career Development Award from the NIDCR/NIH.
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This work was supported in part by grants from the National Institutes of Health and the American Heart Association to D.E.C.
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Ruest, LB., Kedzierski, R., Yanagisawa, M. et al. Deletion of the endothelin-A receptor gene within the developing mandible. Cell Tissue Res 319, 447–453 (2005). https://doi.org/10.1007/s00441-004-0988-1
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DOI: https://doi.org/10.1007/s00441-004-0988-1