TGF-β signaling controls neural crest developmental plasticity via SMAD2/3

Area of Science:

• Developmental Biology
• Stem Cell Biology
• Genetics

Background:

• Neural crest cells are highly plastic stem cells originating from ectoderm.
• Cranial neural crest cells can differentiate into mesodermal derivatives, challenging germ layer theory.
• The molecular mechanisms regulating neural crest developmental potential are not fully understood.

Purpose of the Study:

• To investigate the role of transforming growth factor β (TGF-β) signaling in neural crest development.
• To elucidate how TGF-β signaling influences neural crest axial identity and skeletal differentiation.
• To develop an improved protocol for generating human cranial neural crest cells.

Main Methods:

• Utilized chicken embryos as an in vivo model system.
• Analyzed SMAD2/3-mediated TGF-β signaling pathways.
• Investigated gene regulatory circuits controlling skeletal differentiation.
• Examined the interplay between TGF-β and WNT signaling.

Main Results:

• TGF-β signaling enhances neural crest developmental potential in chicken embryos.
• TGF-β signaling modulates neural crest axial identity and controls skeletal differentiation gene circuits.
• Cooperation between TGF-β and WNT signaling activates cranial-specific cis-regulatory elements.
• Activation of TGF-β signaling reprogrammed trunk neural crest cells to an anterior identity.

Conclusions:

• TGF-β signaling is crucial for the specification of cranial neural crest cells.
• TGF-β signaling endows neural crest cells with the potential to form the craniofacial skeleton.
• This study provides an improved protocol for generating human cranial neural crest cells.