title: Eyeless collaborates with Hedgehog and Decapentaplegic signaling in Drosophila eye induction.
abstract: eyeless (ey) is a key regulator of the eye development pathway in Drosophila. Ectopic expression of ey can induce the expression of several eye-specification genes (eya, so, and dac) and induce eye formation in multiple locations on the body. However, ey does not induce eye formation everywhere where it is ectopically expressed, suggesting that EY needs to collaborate with additional factors for eye induction. We examined ectopic eye induction by EY in the wing disc and found that eye induction was spatially restricted to the posterior compartment and the anterior-posterior (A/P) compartmental border, suggesting a requirement for both HH and DPP signaling. Although EY in the anterior compartment induced dpp and dac, these were not sufficient for eye induction. Coexpression experiments show that EY needs to collaborate with high level of HH and DPP to induce ectopic eye formation. Ectopic eye formation also requires the activation of an eye-specific enhancer of the endogenous hh gene.
authors.affiliation: Institute of Molecular Biology, Academia Sinica, Nankang, Taipei 11529, Taiwan, Republic of China.
authors.forename: Madhuri
authors.initials: M
authors.lastname: Kango-Singh
authors.forename: Amit
authors.initials: A
authors.lastname: Singh
authors.forename: Y
authors.initials: Y
authors.lastname: Henry Sun
mesh_terms: D000818:Animals; D030801:Animals, Genetically Modified; D004268:DNA-Binding Proteins / Q000235:genetics / Q000502:physiology*; D004330:Drosophila / Q000235:genetics / Q000254:growth & development* / Q000502:physiology*; D029721:Drosophila Proteins / Q000235:genetics / Q000502:physiology*; D004742:Enhancer Elements, Genetic; D005123:Eye / Q000254:growth & development*; D018507:Gene Expression Regulation, Developmental; D017344:Genes, Insect; D053823:Hedgehog Proteins; D009928:Organ Specificity; D015398:Signal Transduction; D014921:Wings, Animal / Q000254:growth & development
chemical_list: D004268:DNA-Binding Proteins; D029721:Drosophila Proteins; D053823:Hedgehog Proteins; C064196:dpp protein, Drosophila; C113278:ey protein, Drosophila; C077245:hh protein, Drosophila