Skip to main content
Article thumbnail
Location of Repository

Identification of Receptor-Tyrosine-Kinase-Signaling Target Genes Reveals Receptor-Specific Activities and Pathway Branchpoints During Drosophila Development

By John R. Leatherbarrow and Marc S. Halfon


Receptor tyrosine kinases (RTKs) are an important family of signaling molecules with the unusual property that they are able to transduce their signals using the same downstream pathways. This has led to an unresolved debate as to whether individual receptors are interchangeable, or if each receptor can mediate specific downstream responses. To address this question, we have conducted a screen to identify target genes whose expression is differentially modulated by RTKs and their downstream pathway components. Using whole-mount in situ hybridization in Drosophila embryos exposed to constitutively active RTK pathway signaling, along with quantitative RT–PCR, we found that a significant fraction of target genes respond differentially in a spatial and/or quantitative manner. This includes differential responses to EGF receptor vs. fibroblast growth factor receptor signaling as well as to more downstream components such as Ras1 and pointed. We show that not only genes but also individual alternative transcripts can respond differently to signaling, and we present evidence that the differential responses can be mediated at the transcriptional level. Our results demonstrate that different RTKs can elicit distinct transcriptional responses, and the target genes obtained from our screen provide a valuable resource for further exploration of the mechanisms underlying this signaling specificity

Topics: Investigations
Publisher: Genetics Society of America
OAI identifier:
Provided by: PubMed Central
Download PDF:
Sorry, we are unable to provide the full text but you may find it at the following location(s):
  • http://www.pubmedcentral.nih.g... (external link)
  • Suggested articles

    To submit an update or takedown request for this paper, please submit an Update/Correction/Removal Request.