Pitx2-Sox2-Lef1 interactions specify progenitor oral/dental epithelial cell signaling centers.
Development
; 147(11)2020 06 04.
Article
em En
| MEDLINE
| ID: mdl-32439755
ABSTRACT
Epithelial signaling centers control epithelial invagination and organ development, but how these centers are specified remains unclear. We report that Pitx2 (the first transcriptional marker for tooth development) controls the embryonic formation and patterning of epithelial signaling centers during incisor development. We demonstrate using Krt14Cre /Pitx2flox/flox (Pitx2cKO ) and Rosa26CreERT/Pitx2flox/flox mice that loss of Pitx2 delays epithelial invagination, and decreases progenitor cell proliferation and dental epithelium cell differentiation. Developmentally, Pitx2 regulates formation of the Sox2+ labial cervical loop (LaCL) stem cell niche in concert with two signaling centers the initiation knot and enamel knot. The loss of Pitx2 disrupted the patterning of these two signaling centers, resulting in tooth arrest at E14.5. Mechanistically, Pitx2 transcriptional activity and DNA binding is inhibited by Sox2, and this interaction controls gene expression in specific Sox2 and Pitx2 co-expression progenitor cell domains. We demonstrate new transcriptional mechanisms regulating signaling centers by Pitx2, Sox2, Lef1 and Irx1.
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Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Fatores de Transcrição
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Transdução de Sinais
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Proteínas de Homeodomínio
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Células Epiteliais
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Fator 1 de Ligação ao Facilitador Linfoide
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Fatores de Transcrição SOXB1
Limite:
Animals
Idioma:
En
Ano de publicação:
2020
Tipo de documento:
Article