A MAPK docking site is critical for downregulation of Capicua by Torso and EGFR RTK signaling

Sergio Astigarraga, Rona Grossman, Julieta Díaz-Delfín, Carme Caelles, Ze'ev Paroush, Gerardo Jiménez*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

108 Scopus citations

Abstract

Early Drosophila development requires two receptor tyrosine kinase (RTK) pathways: the Torso and the Epidermal growth factor receptor (EGFR) pathways, which regulate terminal and dorsal-ventral patterning, respectively. Previous studies have shown that these pathways, either directly or indirectly, lead to post-transcriptional downregulation of the Capicua repressor in the early embryo and in the ovary. Here, we show that both regulatory effects are direct and depend on a MAPK docking site in Capicua that physically interacts with the MAPK Rolled. Capicua derivatives lacking this docking site cause dominant phenotypes similar to those resulting from loss of Torso and EGFR activities. Such phenotypes arise from inappropriate repression of genes normally expressed in response to Torso and EGFR signaling. Our results are consistent with a model whereby Capicua is the main nuclear effector of the Torso pathway, but only one of different effectors responding to EGFR signaling. Finally, we describe differences in the modes of Capicua downregulation by Torso and EGFR signaling, raising the possibility that such differences contribute to the tissue specificity of both signals.

Original languageAmerican English
Pages (from-to)668-677
Number of pages10
JournalEMBO Journal
Volume26
Issue number3
DOIs
StatePublished - 7 Feb 2007

Keywords

  • Capicua
  • Drosophila
  • Oogenesis
  • RTK signaling
  • Terminal patterning

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