Notch pathway regulation of neural crest cell development in vivo

Area of Science:

• Developmental Biology
• Cell Signaling

Background:

• Neural crest cells (NCCs) are a transient embryonic population that gives rise to diverse cell types.
• Notch signaling is a conserved cell-cell communication pathway critical for development.

Purpose of the Study:

• To investigate the in vivo function of Notch signaling in murine neural crest-derived cell lineages.

Main Methods:

• Conditional gain-of-function (Wnt1Cre;Rosa(Notch)) and loss-of-function (Wnt1Cre;RBP-J(f/f)) models were used in mice.
• Analysis focused on craniofacial, cardiac, and trunk development, as well as neurogenesis and gliogenesis in dorsal root ganglia.

Main Results:

• Both gain and loss of Notch signaling led to craniofacial and cardiac abnormalities, including malformations in outflow tracts.
• Impaired smooth muscle cell differentiation was observed in pharyngeal NCC derivatives.
• Altered neurogenesis and gliogenesis occurred in dorsal root ganglia, with opposite effects in gain- versus loss-of-function models.

Conclusions:

• Appropriate Notch signaling levels are essential for NCC migration, proliferation, and differentiation.
• These findings have critical implications for understanding craniofacial, cardiac, and neurogenic development and associated diseases.