Synergistic signaling by two BMP ligands through the SAX and TKV receptors controls wing growth and patterning in Drosophila

Theodor E. Haerry, Ongkar Khalsa, Michael B O'Connor, Kristi A. Wharton

Research output: Contribution to journalArticlepeer-review

179 Scopus citations

Abstract

In Drosophila wing discs, a morphogen gradient of DPP has been proposed to determine the transcriptional response thresholds of the downstream genes sal and omb. We present evidence that the concentration of the type I receptor TKV must be low to allow long-range DPP diffusion. Low TKV receptor concentrations result, however, in low signaling activity. To enhance signaling at low DPP concentrations, we find that a second ligand, GBB, augments DPP/TKV activity. GBB signals primarily through the type I receptor SAX, which synergistically enhances TKV signaling and is required for proper OMB expression. We show that OMB expression in wing discs requires synergistic signaling by multiple ligands and receptors to overcome the limitations imposed on DPP morphogen function by receptor concentration levels.

Original languageEnglish (US)
Pages (from-to)3977-3987
Number of pages11
JournalDevelopment
Volume125
Issue number20
StatePublished - 1998

Keywords

  • Activated receptor
  • BMP
  • Dominant negative receptor
  • Morphogen

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