title: Genetic interaction screens identify a role for hedgehog signaling in Drosophila border cell migration.
abstract: BACKGROUND
  Cell motility is essential for embryonic development and physiological processes such as the immune response, but also contributes to pathological conditions such as tumor progression and inflammation. However, our understanding of the mechanisms underlying migratory processes is incomplete. Drosophila border cells provide a powerful genetic model to identify the roles of genes that contribute to cell migration.
  
  
  RESULTS
  Members of the Hedgehog signaling pathway were uncovered in two independent screens for interactions with the small GTPase Rac and the polarity protein Par-1 in border cell migration. Consistent with a role in migration, multiple Hh signaling components were enriched in the migratory border cells. Interference with Hh signaling by several different methods resulted in incomplete cell migration. Moreover, the polarized distribution of E-Cadherin and a marker of tyrosine kinase activity were altered when Hh signaling was disrupted. Conservation of Hh-Rac and Hh-Par-1 signaling was illustrated in the wing, in which Hh-dependent phenotypes were enhanced by loss of Rac or par-1.
  
  
  CONCLUSIONS
  We identified a pathway by which Hh signaling connects to Rac and Par-1 in cell migration. These results further highlight the importance of modifier screens in the identification of new genes that function in developmental pathways.
authors: Division of Cell Biology and Biophysics, School of Biological Sciences, University of Missouri-Kansas City, Kansas City, Missouri 64110, USA.
authors: Erika R
authors: ER
authors: Geisbrecht
authors: Ketki
authors: K
authors: Sawant
authors: Ying
authors: Y
authors: Su
authors: Ze Cindy
authors: ZC
authors: Liu
authors: Debra L
authors: DL
authors: Silver
authors: Ashley
authors: A
authors: Burtscher
authors: Xuejiao
authors: X
authors: Wang
authors: Alan Jian
authors: AJ
authors: Zhu
authors: Jocelyn A
authors: JA
authors: McDonald
mesh_terms: D000818:Animals; D030801:Animals, Genetically Modified; D002465:Cell Movement / Q000235:genetics*; D029721:Drosophila Proteins / Q000235:genetics / Q000378:metabolism / Q000502:physiology*; D004331:Drosophila melanogaster / Q000196:embryology* / Q000235:genetics / Q000378:metabolism / Q000502:physiology; D004843:Epistasis, Genetic / Q000502:physiology; D005260:Female; D020869:Gene Expression Profiling / Q000379:methods; D018507:Gene Expression Regulation, Developmental; D053263:Gene Regulatory Networks / Q000235:genetics; D053823:Hedgehog Proteins / Q000235:genetics / Q000378:metabolism / Q000502:physiology*; D008297:Male; D009024:Morphogenesis / Q000235:genetics / Q000502:physiology; D009866:Oogenesis / Q000235:genetics / Q000502:physiology; D010053:Ovary / Q000166:cytology* / Q000196:embryology; D015398:Signal Transduction / Q000235:genetics / Q000502:physiology
chemical_list: D029721:Drosophila Proteins; D053823:Hedgehog Proteins; C077245:hh protein, Drosophila