Early epithelial signaling center governs tooth budding morphogenesis

Area of Science:

• Developmental biology
• Cell biology
• Organogenesis

Background:

• Signaling centers regulate cell fate and patterning during organogenesis.
• Budding morphogenesis is a key early developmental event, but its cellular mechanisms remain unclear.

Purpose of the Study:

• To investigate the cellular mechanisms of budding morphogenesis using the mouse incisor as a model.
• To identify and characterize the role of signaling centers in early tooth development.

Main Methods:

• Confocal live imaging of mouse incisor explants.
• Analysis of cell proliferation and cell cycle status.
• Investigation of the ectodysplasin/Edar/nuclear factor κB pathway activity.

Main Results:

• A distinct population of nonproliferative epithelial cells forms a signaling center in the early tooth primordium.
• Budding morphogenesis is driven by the proliferation of neighboring cells, not the signaling center.
• The ectodysplasin/Edar/nuclear factor κB pathway is active in the signaling center and influences its size and the overall bud size.

Conclusions:

• The identified signaling center is crucial for initiating and regulating budding morphogenesis in the mouse incisor.
• Signaling center size is functionally linked to organ size.
• The early signaling center is a prerequisite for budding morphogenesis.