Dynamic EGFR-Ras signalling in Drosophila leg development

Dev Dyn. 2005 Aug;233(4):1496-508. doi: 10.1002/dvdy.20452.

Abstract

In Drosophila, as in many other animals, EGFR-Ras signalling has multiple developmental roles from oogenesis to differentiation. In leg development, in particular, it has been described to be responsible for the establishment of distal leg fates in a graded manner. Here, we investigate the patterns of expression of activators of EGFR-Ras signalling, as well as some of the effectors, in order to better understand the patterning of the distal leg, and to investigate further roles of this signalling pathway. These patterns, together with genetic data obtained by different mutant conditions for EGFR-Ras members and transgene expression, suggest two rounds of signalling in leg development. Early, the EGFR ligand Vein is the main player in distal leg patterning, possibly supported later by another ligand activated by Rhomboid. Later, in a second wave of signalling when all the proximal-distal leg fates have been specified, domains of EGFR/Ras activation appear inside each leg segment to regulate Notch-mediated joint development, and also some organs such as tendons and sensory organs. This second wave relies on a ligand activated by Rhomboid.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Body Patterning / physiology
  • DNA-Binding Proteins / biosynthesis
  • DNA-Binding Proteins / genetics
  • Drosophila / growth & development*
  • Drosophila Proteins / biosynthesis
  • Drosophila Proteins / genetics
  • Epidermal Growth Factor / biosynthesis
  • Epidermal Growth Factor / genetics
  • ErbB Receptors / physiology*
  • Extremities / growth & development*
  • Membrane Proteins / biosynthesis
  • Membrane Proteins / genetics
  • Mitogen-Activated Protein Kinases / biosynthesis
  • Mitogen-Activated Protein Kinases / genetics
  • Nerve Tissue Proteins / biosynthesis
  • Nerve Tissue Proteins / genetics
  • Neuregulins / biosynthesis
  • Neuregulins / genetics
  • Proto-Oncogene Proteins / biosynthesis
  • Proto-Oncogene Proteins / genetics
  • Pupa / growth & development
  • Signal Transduction / physiology*
  • Transcription Factors / biosynthesis
  • Transcription Factors / genetics
  • ras Proteins / physiology*

Substances

  • DNA-Binding Proteins
  • Drosophila Proteins
  • Membrane Proteins
  • Nerve Tissue Proteins
  • Neuregulins
  • Proto-Oncogene Proteins
  • Rho protein, Drosophila
  • Transcription Factors
  • pnt protein, Drosophila
  • spi protein, Drosophila
  • vn protein, Drosophila
  • Epidermal Growth Factor
  • ErbB Receptors
  • Mitogen-Activated Protein Kinases
  • ras Proteins