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Vangl2 coordinates cell rearrangements during gut elongation
Michael K Dush1, Nanette M Nascone-Yoder1
1Department of Molecular Biomedical Sciences, College of Veterinary Medicine, North Carolina State University, Raleigh, North Carolina.
Summary
Vangl2 protein guides embryonic gut tube elongation by orienting cell polarity and adhesion. Proper Vangl2 distribution is crucial for coordinated cell rearrangements, lumen formation, and digestive epithelial development.
Area of Science:
- Developmental biology
- Cell biology
- Molecular biology
Background:
- Embryonic gut tube elongation is essential for nutrient absorption.
- Radial cell rearrangements in Xenopus endoderm drive gut lengthening, lumen opening, and epithelial morphogenesis.
- Mechanisms coordinating endoderm rearrangements for gut development remain unclear.
Purpose of the Study:
- To investigate the role of Vangl2 in orienting endoderm cell rearrangements during embryonic gut tube elongation.
- To understand how Vangl2 influences cell polarity and adhesion in the developing gut.
- To elucidate the contribution of Vangl2 to digestive epithelial morphogenesis and lumen formation.
Main Methods:
- Depletion of Vangl2 in Xenopus embryos.
- Analysis of cell polarity and cell-cell adhesion markers.
- Microscopy to assess gut morphology and epithelial architecture.
Main Results:
- Vangl2 localizes to the anterior and apical aspects of endoderm cells before gut elongation.
- Vangl2 depletion results in unpolarized cells, reduced cell adhesion, failed rearrangements, and short, occluded guts.
- Ectopic Vangl2 causes abnormal polarity, aberrant adhesion, failed rearrangements, and malformed lumens with irregular epithelial architecture.
Conclusions:
- Asymmetrical Vangl2 enrichment in endoderm cells orients polarity and adhesion.
- This orientation is critical for coordinating radial rearrangements during gut tube elongation.
- Vangl2 plays a key role in digestive epithelial morphogenesis and lumen formation.
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