Serrate signals through Notch to establish a Wingless-dependent organizer at the dorsal/ventral compartment boundary of the Drosophila wing

Development ◽  
1995 ◽  
Vol 121 (12) ◽  
pp. 4215-4225 ◽  
Author(s):  
F.J. Diaz-Benjumea ◽  
S.M. Cohen
Keyword(s):  
Notch Ligand ◽  
Drosophila Wing ◽  
Compartment Boundary ◽  
Anterior Posterior

Growth and patterning of the Drosophila wing is controlled by organizing centers located at the anterior-posterior and dorsal-ventral compartment boundaries. Interaction between cells in adjacent compartments establish the organizer. We report here that Serrate and Notch mediate the interaction between dorsal and ventral cells to direct localized expression of Wingless at the D/V boundary. Serrate serves as a spatially localized ligand which directs Wg expression through activation of Notch. Ligand independent activation of Notch is sufficient to direct Wg expression, which in turn mediates the organizing activity of the D/V boundary.

Nubbin encodes a POU-domain protein required for proximal-distal patterning in the Drosophila wing

Development ◽  
1995 ◽  
Vol 121 (2) ◽  
pp. 589-599 ◽  
Author(s):  
M. Ng ◽  
F.J. Diaz-Benjumea ◽  
S.M. Cohen
Keyword(s):  
Growth Control ◽  
Normal Growth ◽  
Control Center ◽  
Genetic Mosaics ◽  
Drosophila Wing ◽  
Pou Domain ◽  
Compartment Boundary ◽  
Wing Structures ◽  
Wing Imaginal Discs ◽  
Anterior Posterior

The nubbin gene is required for normal growth and patterning of the wing in Drosophila. We report here that nubbin encodes a member of the POU family of transcription factors. Regulatory mutants which selectively remove nubbin expression from wing imaginal discs lead to loss of wing structures. Although nubbin is expressed throughout the wing primordium, analysis of genetic mosaics suggests a localized requirement for nubbin activity in the wing hinge. These observations suggest the existence of a novel proximal-distal growth control center in the wing hinge, which is required in addition to the well characterized anterior-posterior and dorsal-ventral compartment boundary organizing centers.

Role of knot (kn) in Wing Patterning in Drosophila

Genetics ◽  
1997 ◽  
Vol 147 (3) ◽  
pp. 1203-1212 ◽  
Author(s):  
Katerina Nestoras ◽  
Helena Lee ◽  
Jym Mohler
Keyword(s):  
Hedgehog Signaling ◽  
Imaginal Disc ◽  
Hedgehog Signaling Pathway ◽  
Posterior Compartment ◽  
Drosophila Wing ◽  
Compartment Boundary ◽  
Hh Signaling ◽  
Embryonic Segmentation ◽  
Anterior Posterior

We have undertaken a genetic analysis of new strong alleles of knot (kn). The original kn1 mutation causes an alteration of wing patterning similar to that associated with mutations of fused (fu), an apparent fusion of veins 3 and 4 in the wing. However, unlike fu, strong kn mutations do not affect embryonic segmentation and indicate that kn is not a component of a general Hh (Hedgehog)-signaling pathway. Instead we find that kn has a specific role in those cells of the wing imaginal disc that are subject to ptc-mediated Hh-signaling. Our results suggest a model for patterning the medial portion of the Drosophila wing, whereby the separation of veins 3 and 4 is maintained by kn activation in the intervening region in response to Hh-signaling across the adjacent anterior-posterior compartment boundary.

groucho and hedgehog regulate engrailed expression in the anterior compartment of the Drosophila wing

Development ◽  
1995 ◽  
Vol 121 (10) ◽  
pp. 3467-3476 ◽  
Author(s):  
J.F. de Celis ◽  
M. Ruiz-Gomez
Keyword(s):  
Cell Growth ◽  
Normal Growth ◽  
Wing Disc ◽  
Anterior Compartment ◽  
Drosophila Wing ◽  
Compartment Boundary ◽  
Ectopic Activation ◽  
Selector Genes ◽  
Dorsoventral Boundary ◽  
Anterior Posterior

Drosophila imaginal discs are divided into units called compartments. Cells belonging to the same compartment are related by lineage and express a characteristic set of ‘selector genes’. The borders between compartments act as organizing centres that influence cell growth within compartments. Thus, in the cells immediately anterior to the anterior-posterior compartment boundary the presence of the hedgehog product causes expression of decapentaplegic, which, in turn, influences the growth and patterning of the wing disc. The normal growth of the disc requires that posterior-specific genes, such as hedgehog and engrailed are not expressed in cells of the anterior compartment. Here we show that hedgehog can activate engrailed in the anterior compartment and that both hedgehog and engrailed are specifically repressed in anterior cells by the activity of the neurogenic gene groucho. In groucho mutant discs, hedgehog and engrailed are expressed at the dorsoventral boundary of the anterior compartment, leading to the ectopic activation of decapentaplegic and patched and to a localised increase in cell growth associated with pattern duplications. The presence of engrailed in the anterior compartment causes the transformation of anterior into posterior structures.

Smoothened-mediated Hedgehog signalling is required for the maintenance of the anterior-posterior lineage restriction in the developing wing of Drosophila

Development ◽  
1997 ◽  
Vol 124 (20) ◽  
pp. 4053-4063 ◽  
Author(s):  
S.S. Blair ◽  
A. Ralston
Keyword(s):  
Gene Expression ◽  
Cellular Mechanisms ◽  
Hedgehog Signalling ◽  
Compartment Boundary ◽  
Complex Process ◽  
Normal Site ◽  
Selector Genes ◽  
Signalling Models ◽  
To Receive ◽  
Anterior Posterior

It is thought that the posterior expression of the ‘selector’ genes engrailed and invected control the subdivision of the growing wing imaginal disc of Drosophila into anterior and posterior lineage compartments. At present, the cellular mechanisms by which separate lineage compartments are maintained are not known. Most models have assumed that the presence or absence of selector gene expression autonomously drives the expression of compartment-specific adhesion or recognition molecules that inhibit intermixing between compartments. However, our present understanding of Hedgehog signalling from posterior to anterior cells raises some interesting alternative models based on a cell's response to signalling. We show here that anterior cells that lack smoothened, and thus the ability to receive the Hedgehog signal, no longer obey a lineage restriction in the normal position of the anterior-posterior boundary. Rather these clones extend into anatomically posterior territory, without any changes in engrailed/invected gene expression. We have also examined clones lacking both en and inv; these too show complex behaviors near the normal site of the compartment boundary, and do not always cross entirely into anatomically anterior territory. Our results suggest that compartmentalization is a complex process involving intercompartmental signalling; models based on changes in affinity or growth will be discussed.

Interactions among Delta, Serrate and Fringe modulate Notch activity during Drosophila wing development

Development ◽  
1998 ◽  
Vol 125 (15) ◽  
pp. 2951-2962 ◽  
Author(s):  
T. Klein ◽  
A.M. Arias
Keyword(s):  
Notch Signalling ◽  
Dominant Negative ◽  
Wing Development ◽  
Notch Signalling Pathway ◽  
Notch Ligand ◽  
Drosophila Wing ◽  
Signalling Molecule ◽  
Dorsoventral Boundary ◽  
Notch Ligands ◽  
Specific Nuclear Protein

The Notch signalling pathway plays an important role during the development of the wing primordium, especially of the wing blade and margin. In these processes, the activity of Notch is controlled by the activity of the dorsal specific nuclear protein Apterous, which regulates the expression of the Notch ligand, Serrate, and the Fringe signalling molecule. The other Notch ligand, Delta, also plays a role in the development and patterning of the wing. It has been proposed that Fringe modulates the ability of Serrate and Delta to signal through Notch and thereby restricts Notch signalling to the dorsoventral boundary of the developing wing blade. Here we report the results of experiments aimed at establishing the relationships between Fringe, Serrate and Delta during wing development. We find that Serrate is not required for the initiation of wing development but rather for the expansion and early patterning of the wing primordium. We provide evidence that, at the onset of wing development, Delta is under the control of apterous and might be the Notch ligand in this process. In addition, we find that Fringe function requires Su(H). Our results suggest that Notch signalling during wing development relies on careful balances between positive and dominant negative interactions between Notch ligands, some of which are mediated by Fringe.

Expression and function of decapentaplegic and thick veins during the differentiation of the veins in the Drosophila wing

Development ◽  
1997 ◽  
Vol 124 (5) ◽  
pp. 1007-1018 ◽  
Author(s):  
J.F. Celis de
Keyword(s):  
Imaginal Disc ◽  
Signal Transduction Pathways ◽  
Pupal Development ◽  
Transmembrane Receptors ◽  
Notch Ligand ◽  
Regulatory Interactions ◽  
Drosophila Wing ◽  
Signalling Molecule ◽  
And Function

The differentiation of the veins in the Drosophila wing involves the coordinate activities of several signal transduction pathways, including those mediated by the transmembrane receptors Torpedo and Notch. In this report, the role of the signalling molecule Decapentaplegic during vein differentiation has been analysed. It is shown that decapentaplegic is expressed in the pupal veins under the control of genes that establish vein territories in the imaginal disc. Decapentaplegic, acting through its receptor Thick veins, activates vein differentiation and restricts expression of both veinlet and the Notch-ligand Delta to the developing veins. Genetic combinations between mutations that increase or reduce Notch, veinlet and decapentaplegic activities suggest that the maintenance of the vein differentiation state during pupal development involves cross-regulatory interactions between these pathways.

Control of growth and patterning of the Drosophila wing imaginal disc by EGFR-mediated signaling

Development ◽  
2002 ◽  
Vol 129 (6) ◽  
pp. 1369-1376 ◽  
Author(s):  
Myriam Zecca ◽  
Gary Struhl
Keyword(s):  
Gene Expression ◽  
Imaginal Disc ◽  
Ectopic Expression ◽  
Growth Factor Receptor ◽  
Wing Disc ◽  
Wing Imaginal Disc ◽  
Egfr Signaling ◽  
Drosophila Wing ◽  
Compartment Boundary ◽  
Egfr Ligand

The subdivision of the Drosophila wing imaginal disc into dorsoventral (DV) compartments and limb-body wall (wing-notum) primordia depends on Epidermal Growth Factor Receptor (EGFR) signaling, which heritably activates apterous (ap) in D compartment cells and maintains Iroquois Complex (Iro-C) gene expression in prospective notum cells. We examine the source, identity and mode of action of the EGFR ligand(s) that specify these subdivisions. Of the three known ligands for the Drosophila EGFR, only Vein (Vn), but not Spitz or Gurken, is required for wing disc development. We show that Vn activity is required specifically in the dorsoproximal region of the wing disc for ap and Iro-C gene expression. However, ectopic expression of Vn in other locations does not reorganize ap or Iro-C gene expression. Hence, Vn appears to play a permissive rather than an instructive role in organizing the DV and wing-notum segregations, implying the existance of other localized factors that control where Vn-EGFR signaling is effective. After ap is heritably activated, the level of EGFR activity declines in D compartment cells as they proliferate and move ventrally, away from the source of the instructive ligand. We present evidence that this reduction is necessary for D and V compartment cells to interact along the compartment boundary to induce signals, like Wingless (Wg), which organize the subsequent growth and differentiation of the wing primordium.

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