Sfrp5 coordinates foregut specification and morphogenesis by antagonizing both canonical and noncanonical Wnt11...

Area of Science:

• Developmental Biology
• Molecular Biology
• Cell Biology

Background:

• Organogenesis involves intricate coordination of cell identity and tissue morphogenesis.
• Mechanisms governing these processes, particularly in early organ development, remain incompletely understood.

Purpose of the Study:

• To elucidate the roles of Wnt11 and secreted frizzled-related protein 5 (Sfrp5) in Xenopus foregut development.
• To investigate how these factors coordinate cell fate and tissue morphogenesis.

Main Methods:

• Depletion of Sfrp5 in Xenopus embryos.
• Analysis of gene expression patterns in the developing foregut.
• Assessment of cell adhesion and epithelial polarization.
• Investigation of Wnt/beta-catenin and Wnt/Planar Cell Polarity (PCP) signaling pathways.

Main Results:

• Sfrp5 depletion led to reduced foregut gene expression and underdeveloped liver and pancreatic buds.
• Ventral foregut cells exhibited loss of adhesion and failed to form a polarized epithelium.
• Cell fate and epithelial defects were attributed to dysregulated Wnt/beta-catenin and Wnt/PCP signaling mediated by Wnt11.
• Sfrp5 was shown to locally inhibit Wnt11, preserving foregut identity and enabling epithelial formation.

Conclusions:

• Wnt11 and Sfrp5 interaction is a novel mechanism coordinating canonical and noncanonical Wnt signaling in organogenesis.
• This mechanism is critical for maintaining early foregut cell identity and facilitating epithelial development.
• Findings have potential implications for understanding organ development and cancer biology.