SCALLOPED interacts with YORKIE, the nuclear effector of the hippo tumor-suppressor pathway in Drosophila.
In Drosophila, SCALLOPED (SD) belongs to a family of evolutionarily conserved proteins characterized by the presence of a TEA/ATTS DNA-binding domain [1, 2]. SD physically interacts with the product of the vestigial (vg) gene, where the dimer functions as a master gene controlling wing formation [3, 4]. The VG-SD dimer activates the transcription of several specific wing genes, including sd and vg themselves [5, 6]. The dimer drives cell-cycle progression by inducing expression of the dE2F1 transcription factor [7], which regulates genes involved in DNA replication and cell-cycle progression. Recently, YORKIE (YKI) was identified as a transcriptional coactivator that is the downstream effector of the Hippo signaling pathway, which controls cell proliferation and apoptosis in Drosophila[8]. We identified SD as a partner for YKI. We show that interaction between YKI and SD increases SD transcriptional activity both ex vivo in Drosophila S2 cells and in vivo in Drosophila wing discs and promotes YKI nuclear localization. We also show that YKI overexpression induces vg and dE2F1 expression and that proliferation induced by YKI or by a dominant-negative form of FAT in wing disc is significantly reduced in a sd hypomorphic mutant context. Contrary to YKI, SD is not required in all imaginal tissues. This indicates that YKI-SD interaction acts in a tissue-specific fashion and that other YKI partners must exist.
Goulev
Youlian
Y
Department of Developmental Biology, Unité Mixte de Recherche 7592, Université Paris 7 Denis-Diderot, Tour 43 2, Place Jussieu, F-75251 Paris Cedex 05, France.
Fauny
Jean Daniel
JD
Gonzalez-Marti
Beatriz
B
Flagiello
Domenico
D
Silber
Joël
J
Zider
Alain
A
D000818:Animals; D049109:Cell Proliferation; D004330:Drosophila / Q000254:growth & development / Q000378:metabolism*; D029721:Drosophila Proteins / Q000378:metabolism*; D006367:HeLa Cells; D006801:Humans; D047908:Intracellular Signaling Peptides and Proteins / Q000378:metabolism*; D009024:Morphogenesis / Q000502:physiology; D009687:Nuclear Proteins / Q000378:metabolism*; D011494:Protein Kinases / Q000378:metabolism; D017346:Protein Serine-Threonine Kinases / Q000378:metabolism*; D015398:Signal Transduction / Q000502:physiology; D015534:Trans-Activators / Q000378:metabolism*; D014157:Transcription Factors / Q000378:metabolism*; D025521:Tumor Suppressor Proteins / Q000378:metabolism; D014921:Wings, Animal / Q000254:growth & development*; D000091102:YAP-Signaling Proteins; D000099317:Hippo Kinases
D029721:Drosophila Proteins; D047908:Intracellular Signaling Peptides and Proteins; D009687:Nuclear Proteins; D011494:Protein Kinases; D017346:Protein Serine-Threonine Kinases; D015534:Trans-Activators; D014157:Transcription Factors; D025521:Tumor Suppressor Proteins; D000091102:YAP-Signaling Proteins; C496298:E2f1 protein, Drosophila; C499633:Mats protein, Drosophila; C503814:Yki protein, Drosophila; C087984:sd protein, Drosophila; C095064:vg protein, Drosophila; C093503:wts protein, Drosophila; C499474:hpo protein, Drosophila; D000099317:Hippo Kinases