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XB-ART-12646
Mech Dev July 1, 1999; 85 (1-2): 123-31.

Antagonist activity of DWnt-4 and wingless in the Drosophila embryonic ventral ectoderm and in heterologous Xenopus assays.

Gieseler K , Graba Y , Mariol MC , Wilder EL , Martinez-Arias A , Lemaire P , Pradel J .


Abstract
Wnt genes encode secreted signalling molecules involved in a number of basic developmental processes. In Drosophila, wingless and DWnt-4 are two physically clustered Wnt genes, which are transcribed in overlapping patterns during embryogenesis and, in several instances, are controlled by the same regulatory molecules. To address the question of the functional relationship of wingless and DWnt-4, we analysed how embryonic cells respond when they are exposed, simultaneously or not, to the encoded Wnt signals. We show that DWnt-4 has the capacity to antagonise Wingless signalling both in the Drosophila ventral epidermis and in a heterologous system, the Xenopus embryo. We provide evidence that DWnt-4 inhibits the Wingless/Wnt-1 signalling pathway upstream of the activation of transcriptional targets. This is the first report that antagonising Wnt signals exist in Drosophila.

PubMed ID: 10415353
Article link: Mech Dev
Grant support: [+]

Species referenced: Xenopus
Genes referenced: chdh chrd.1 gsc otx2 wnt4


Article Images: [+] show captions