title: Cell type-specific responses to wingless, hedgehog and decapentaplegic are essential for patterning early eye-antenna disc in Drosophila.
abstract: The Drosophila eye-antenna imaginal disc (ead) is a flattened sac of two-layered epithelia, from which most head structures are derived. Secreted morphogens like Wingless (Wg), Hedgehog (Hh), and Decapentaplegic (Dpp) are important for early patterning of ead, but the underlying mechanisms are still largely unknown. To understand how these morphogens function in the ead of early larval stages, we used wg-LacZ and dpp-Gal4 markers for the examination of wild-type and mutant eads. We found that the ead immediately after hatching was crescent-shaped with the Bolwig's nerve at the ventral edge, suggesting that it consists of dorsal domain. In a subsequent step, transcriptional induction of dpp in the cells along the Bolwig's nerve was followed by rapid growth of the ventral domain. Both Wg and Hh were required for the formation of the ventral domain. Wg was crucial for the growth of the entire ead, but Hh was essential for cell division only in the dorsal domain. In the ventral domain, Hh regulated dpp transcription. Based on these data, we propose that signaling among distinct groups of cells expressing Wg, Dpp, or Hh in the ead of the first-instar larvae are critical for coordinated growth and patterning of ead.
authors: Department of Biological Sciences, Korea Advanced Institute of Science and Technology, 291 Daehak-ro, Yuseong-gu, Daejeon, Korea.
authors: Jong-Hoon
authors: JH
authors: Won
authors: Orkhon
authors: O
authors: Tsogtbaatar
authors: Department of Biological Sciences, Korea Advanced Institute of Science and Technology, 291 Daehak-ro, Yuseong-gu, Daejeon, Korea.
authors: Orkhon
authors: O
authors: Tsogtbartarr
authors: Department of Biological Sciences, Korea Advanced Institute of Science and Technology, 291 Daehak-ro, Yuseong-gu, Daejeon, Korea.
authors: Wonseok
authors: W
authors: Son
authors: Department of Biology, Center for Tissue Regeneration and Engineering at Dayton (TREND), University of Dayton, 300 College Park, Dayton, Ohio 45469-2320, United States of America.
authors: Amit
authors: A
authors: Singh
authors: Department of Biological Sciences, Korea Advanced Institute of Science and Technology, 291 Daehak-ro, Yuseong-gu, Daejeon, Korea.
authors: Kwang-Wook
authors: KW
authors: Choi
authors: Department of Biological Sciences, Korea Advanced Institute of Science and Technology, 291 Daehak-ro, Yuseong-gu, Daejeon, Korea.
authors: Kyung-Ok
authors: KO
authors: Cho
mesh_terms: D000818:Animals; D019521:Body Patterning / Q000502:physiology*; D029721:Drosophila Proteins / Q000378:metabolism*; D004331:Drosophila melanogaster / Q000196:embryology / Q000235:genetics / Q000254:growth & development*; D005123:Eye / Q000196:embryology / Q000254:growth & development* / Q000378:metabolism; D005260:Female; D018507:Gene Expression Regulation, Developmental; D053823:Hedgehog Proteins / Q000378:metabolism*; D007124:Immunoenzyme Techniques; D008297:Male; D009024:Morphogenesis; D009154:Mutation / Q000235:genetics; D015398:Signal Transduction; D051155:Wnt1 Protein / Q000378:metabolism*
chemical_list: D029721:Drosophila Proteins; D053823:Hedgehog Proteins; D051155:Wnt1 Protein; C064196:dpp protein, Drosophila; C074622:wg protein, Drosophila; C077245:hh protein, Drosophila