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Related Experiment Videos

The little R cell that could.

Raghavendra Nagaraj1, Utpal Banerjee

  • 1Department of Molecular, Cell and Developmental Biology and Molecular Biology Institute, University of California, Los Angeles, CA 90095, USA.

The International Journal of Developmental Biology
|November 24, 2004
PubMed
Summary

Drosophila eye development uses inter-cellular signaling to specify cell fates. Receptor tyrosine kinase (RTK) and Notch pathways combine and interact to generate cell diversity.

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Area of Science:

  • Developmental Biology
  • Cell Signaling
  • Genetics

Background:

  • Drosophila eye development serves as a model for studying inter-cellular signaling in cell fate specification.
  • The Sevenless gene, a receptor tyrosine kinase (RTK), is crucial for specifying the UV-sensitive R7 cell fate.
  • The Ras/Raf/MAPK pathway operates downstream of Sevenless in R7 cell fate determination.

Purpose of the Study:

  • To review the genetic strategies used to elucidate the Sevenless pathway and its link to the Ras/Raf/MAPK cascade.
  • To discuss the roles of Epidermal Growth Factor Receptor (EGFR) and Notch signaling in cell fate specification during eye development.
  • To explore how these pathways interact synergistically or antagonistically to generate cell fate diversity.

Main Methods:

  • Review of genetic screens and analyses in Drosophila eye development.
  • Examination of inter-cellular signaling pathways, including RTKs (Sevenless, EGFR) and Notch.
  • Analysis of pathway interactions, such as sequential regulation and combinatorial control of gene expression.

Main Results:

  • Elucidation of the Sevenless pathway, connecting RTK signaling to the Ras/Raf/MAPK cascade.
  • Demonstration of EGFR and Notch signaling pathways functioning antagonistically or synergistically in cell fate specification.
  • Identification of EGFR-mediated regulation of the Delta ligand, linking RTK and Notch pathways sequentially.
  • Evidence for combinatorial pathway action on enhancer elements controlling target gene expression.

Conclusions:

  • Elegant genetic strategies have revealed key signaling pathways governing Drosophila eye development.
  • Receptor tyrosine kinase and Notch signaling pathways are utilized iteratively and combinatorially.
  • These complex signaling interactions generate the necessary diversity for specifying unique cell fates in the developing eye.

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