Serrate and wingless cooperate to induce vestigial gene expression and wing formation in Drosophila

Serrate and wingless cooperate to induce vestigial gene expression and wing formation in Drosophila Background: The appendages of insects, like the limbs of vertebrates, grow out of the body wall after the establishment of a proximo-distal axis among a group of primordial cells. In Drosophila , the wing develops in the limbless larva from one of the imaginal discs of the thorax, which give rise to the adult epidermis. The earliest identified requirement in wing development is for the induction of vestigial (vg) gene expression at the interface between ventral cells and dorsal cells of the wing disc. It has been proposed that this event requires two reciprocal signals — one from the dorsal to the ventral cells and the other from the ventral to the dorsal cells — which trigger vg expression at the presumptive wing margin and hence initiate the development of the wing tissue. Results We have identified four genes — Serrate (Ser), wingless (wg), Notch and Suppressor of Hairless (Su(H)) — whose activity is required during the second and early third larval instars for the expression of vg . Analysis of the functions and patterns of expression of these genes at the time of the inductive event indicates that the Ser protein acts as a dorsal signal, and the Wg protein as a ventral signal for the induction of vg expression. Furthermore, the expression of both Ser and Wg is sufficient to trigger ectopic wing development in the wing disc and leg discs. The product of the Notch gene, which encodes a receptor, is also required for this event and we suggest that its role is to integrate the inputs of Ser and Wg. Conclusion We show that the induction of vg , which initiates wing development in Drosophila , requires the combined activities of Ser, wg and Notch . Based on the patterns of expression and requirements for Ser and wg in this process, we propose that Ser is a dorsal signal and that Wg is a ventral signal, and that their combination at the dorso-ventral interface activates the Notch receptor and leads to vg expression. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Current Biology Elsevier

Serrate and wingless cooperate to induce vestigial gene expression and wing formation in Drosophila

Current Biology, Volume 5 (12) – Dec 1, 1995

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Publisher
Elsevier
Copyright
Copyright © 1995 Elsevier Science Ltd
ISSN
0960-9822
D.O.I.
10.1016/S0960-9822(95)00281-8
Publisher site
See Article on Publisher Site

Abstract

Background: The appendages of insects, like the limbs of vertebrates, grow out of the body wall after the establishment of a proximo-distal axis among a group of primordial cells. In Drosophila , the wing develops in the limbless larva from one of the imaginal discs of the thorax, which give rise to the adult epidermis. The earliest identified requirement in wing development is for the induction of vestigial (vg) gene expression at the interface between ventral cells and dorsal cells of the wing disc. It has been proposed that this event requires two reciprocal signals — one from the dorsal to the ventral cells and the other from the ventral to the dorsal cells — which trigger vg expression at the presumptive wing margin and hence initiate the development of the wing tissue. Results We have identified four genes — Serrate (Ser), wingless (wg), Notch and Suppressor of Hairless (Su(H)) — whose activity is required during the second and early third larval instars for the expression of vg . Analysis of the functions and patterns of expression of these genes at the time of the inductive event indicates that the Ser protein acts as a dorsal signal, and the Wg protein as a ventral signal for the induction of vg expression. Furthermore, the expression of both Ser and Wg is sufficient to trigger ectopic wing development in the wing disc and leg discs. The product of the Notch gene, which encodes a receptor, is also required for this event and we suggest that its role is to integrate the inputs of Ser and Wg. Conclusion We show that the induction of vg , which initiates wing development in Drosophila , requires the combined activities of Ser, wg and Notch . Based on the patterns of expression and requirements for Ser and wg in this process, we propose that Ser is a dorsal signal and that Wg is a ventral signal, and that their combination at the dorso-ventral interface activates the Notch receptor and leads to vg expression.

Journal

Current BiologyElsevier

Published: Dec 1, 1995

References

  • Imaginal disc development
    Cohen, S
  • Drosophila wingless: a paradigm for the function and mechanism of Wnt signalling
    Siegfried, E; Perrimon, N
  • Interactions of vestigial and scabrous with the Notch locus of Drosophila melanogaster
    Rabinow, L; Birchler, J
  • The genetics of a small autosomal region of Drosophila melanogaster containing the structural gene for Alcohol dehydrogenase. III Hypomorphic and hypermorphic mutations affecting the expression of Hairless
    Ashburner, M

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