Laminin is required to orient epithelial polarity in the C. elegans pharynx

Development. 2012 Jun;139(11):2050-60. doi: 10.1242/dev.078360. Epub 2012 Apr 25.


The development of many animal organs involves a mesenchymal to epithelial transition, in which cells develop and coordinate polarity through largely unknown mechanisms. The C. elegans pharynx, which is an epithelial tube in which cells polarize around a central lumen, provides a simple system with which to understand the coordination of epithelial polarity. We show that cell fate regulators cause pharyngeal precursor cells to group into a bilaterally symmetric, rectangular array of cells called the double plate. The double plate cells polarize with apical localization of the PAR-3 protein complex, then undergo apical constriction to form a cylindrical cyst. We show that laminin, but not other basement membrane components, orients the polarity of the double plate cells. Our results provide in vivo evidence that laminin has an early role in cell polarity that can be distinguished from its later role in basement membrane integrity.

Publication types

  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Caenorhabditis elegans / embryology*
  • Caenorhabditis elegans Proteins / metabolism*
  • Cell Polarity / physiology*
  • Epithelial Cells / physiology*
  • Fluorescent Antibody Technique
  • Laminin / metabolism
  • Laminin / physiology*
  • Microscopy, Confocal
  • Pharynx / cytology
  • Pharynx / embryology*
  • Protein-Serine-Threonine Kinases


  • Caenorhabditis elegans Proteins
  • Laminin
  • PAR-3 protein, C elegans
  • Protein-Serine-Threonine Kinases