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The fu gene discriminates between pathways to control dpp expression in Drosophila imaginal discs
journal contribution
posted on 2023-06-07, 22:39 authored by Ernesto Sánchez-Herrero, Juan Pablo Couso, Javier Capdevila, Isabel GuerreroThe genes decapentaplegic (dpp) and wingless (wg), which encode secreted factors of the TGF-ß and Wnt families, respectively, are required for the proper development of the imaginai discs. The expression of these genes must be finely regulated since their ectopic expression induces overgrowth and pattern alterations in wings and legs. Genes like patched (ptc) and costal-2 (cos-2), and the gene encoding the catalytic subunit of the protein kinase A gene (pkA) are required to restrict dpp and wg expression in their proper positions. We show here that some mutations in the cubitus interrupts (ci) gene also show ectopic dpp expression in the wing disc. We have also analyzed the functional hierarchy between these genes and the gene fused (FU), in the activation of dpp by the hedgehog (hh) signal. fu is required to transmit the hh signal in imaginai discs, since fu mutations rescue the phenotype due to the ectopic hh expression or to the lack of ptc activity. fu is also required for the activation of engrailed (en) caused when hh is ectopically activated in the wing disc. By contrast, fu mutations do not rescue the phenotypic consequences of the abnormal ci, cos-2 or pkA activity. Although fu, cos-2 and ci probably form part of the same pathway that controls dpp expression, pkA probably controls dpp transcription by a different pathway.
History
Publication status
- Published
Journal
Mechanisms of DevelopmentISSN
09254773Publisher
Mechanisms of DevelopmentExternal DOI
Issue
2Volume
55Page range
159-170ISBN
0265-9247Department affiliated with
- Clinical and Experimental Medicine Publications
Notes
Describes the roles of the fused kinase in hedhehog signallingFull text available
- No
Peer reviewed?
- Yes