Identification of FGF-dependent genes in the Drosophila tracheal system.
The embryonic development of the tracheal system of the fruit fly Drosophila provides a paradigm for genetic studies of branching morphogenesis. Efforts of many laboratories have identified Branchless (Bnl, a fibroblast growth factor homologue) and Breathless (Btl, the receptor homologue) as crucial factors at many stages of tracheal system development. The downstream targets of the Bnl/Btl signalling cascade, however, remain mostly unknown. Misexpression of the bnl gene results in specific tracheal phenotypes that lead to larval death. We characterised the transcriptional profiles of targeted over-expression of bnl in the embryonic trachea and of loss-of-function bnl(P1) mutant embryos. Gene expression data was mapped to high-throughput in situ hybridisation based ImaGO-annotation. Thus, we identified and confirmed by quantitative PCR 13 Bnl-dependent genes that are expressed in cells within and outside of the tracheal system.
Stahl
Markus
M
Department of Molecular Developmental Biology, Max Planck Institute for Biophysical Chemistry, Am Fassberg 11, Göttingen 37077, Germany.
Schuh
Reinhard
R
Adryan
Boris
B
D000595:Amino Acid Sequence; D000818:Animals; D030801:Animals, Genetically Modified; D001483:Base Sequence; D017931:DNA Primers / Q000235:genetics; D029721:Drosophila Proteins / Q000235:genetics*; D004331:Drosophila melanogaster / Q000196:embryology* / Q000235:genetics* / Q000378:metabolism; D005346:Fibroblast Growth Factors / Q000235:genetics*; D018507:Gene Expression Regulation, Developmental; D017344:Genes, Insect; D017403:In Situ Hybridization; D008969:Molecular Sequence Data; D009154:Mutation; D010641:Phenotype; D011505:Protein-Tyrosine Kinases / Q000235:genetics*; D017468:Receptors, Fibroblast Growth Factor / Q000235:genetics*; D017386:Sequence Homology, Amino Acid; D015398:Signal Transduction; D014132:Trachea / Q000196:embryology / Q000378:metabolism
D017931:DNA Primers; D029721:Drosophila Proteins; D017468:Receptors, Fibroblast Growth Factor; C102644:bnl protein, Drosophila; D005346:Fibroblast Growth Factors; C102301:BTL protein, Drosophila; D011505:Protein-Tyrosine Kinases