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Cell interactions and patterned intercalations shape and link epithelial tubes in C. elegans.

Jeffrey P Rasmussen1, Jessica L Feldman, Sowmya Somashekar Reddy

  • 1Fred Hutchinson Cancer Research Center, Seattle, Washington, United States of America ; Howard Hughes Medical Institute, Chevy Chase, Maryland, United States of America ; Molecular and Cellular Biology Program, University of Washington, Seattle, Washington, United States of America.

Plos Genetics
|September 17, 2013
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Summary
This summary is machine-generated.

This study reveals how the nematode C. elegans forms its digestive tract tubes. It highlights the roles of cell polarity, cell intercalation, and specific genes in connecting these tubes correctly.

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Area of Science:

  • Developmental Biology
  • Cell Biology
  • Genetics

Background:

  • Polarized epithelial tubes form essential organ systems in animals.
  • Complex organs require coordinated tube formation and connection with shared polarity.
  • The Caenorhabditis elegans digestive tract offers a simplified model for studying epithelial tube development.

Purpose of the Study:

  • To investigate the cellular and molecular mechanisms of epithelial tube formation and connection in the C. elegans digestive tract.
  • To understand how separate tubes achieve common polarity for seamless integration.

Main Methods:

  • Live imaging of developing C. elegans embryos.
  • 3D reconstructions of cell development.
  • Analysis of cell polarity cues, including laminin distribution.
  • Investigating the roles of transcription factors DIE-1 and EGL-43/EVI1.
  • Examining the involvement of the Notch signaling pathway.

Main Results:

  • Valve cells acquire apicobasal polarity, influenced by adjacent intestinal cells restricting laminin.
  • Pharyngeal and valve cells use actin-rich lamellipodia for exploration and cell intercalation.
  • Valve tube formation involves specific cell embedding and symmetrical organization around a central axis.
  • DIE-1 and EGL-43/EVI1 regulate cell intercalation and fates during valve development.
  • The Notch pathway is crucial for defining the boundary between pharyngeal and valve tubes.

Conclusions:

  • The study elucidates key steps in C. elegans digestive tract tube formation, including polarity establishment and cell rearrangement.
  • It identifies critical molecular players like laminin, DIE-1, EGL-43/EVI1, and the Notch pathway in this process.
  • Findings provide insights into fundamental principles of epithelial tube morphogenesis relevant to broader developmental biology.