WntD is a feedback inhibitor of Dorsal/NF-kappa B in Drosophila development and immunity

M D Gordon, M S Dionne, D S Schneider, R Nusse

Research output: Contribution to journalArticlepeer-review

131 Citations (Scopus)

Abstract

Regulating the nuclear factor-kappa B (NF-kappa B) family of transcription factors is of critical importance to animals, with consequences of misregulation that include cancer, chronic inflammatory diseases and developmental defects(1). Studies in Drosophila melanogaster have proved fruitful in determining the signals used to control NF-kappa B proteins, beginning with the discovery that the Toll/NF-kappa B pathway, in addition to patterning the dorsal - ventral axis of the fly embryo, defines a major component of the innate immune response in both Drosophila and mammals(2,3). Here, we characterize the Drosophila wntD (Wnt inhibitor of Dorsal) gene. We show that WntD acts as a feedback inhibitor of the NF-kappa B homologue Dorsal during both embryonic patterning and the innate immune response to infection. wntD expression is under the control of Toll/Dorsal signalling, and increased levels of WntD block Dorsal nuclear accumulation, even in the absence of the I kappa B homologue Cactus. The WntD signal is independent of the common Wnt signalling component Armadillo (beta-catenin). By engineering a gene knockout, we show that wntD loss-of-function mutants have immune defects and exhibit increased levels of Toll/Dorsal signalling. Furthermore, the wntD mutant phenotype is suppressed by loss of zygotic dorsal. These results describe the first secreted feedback antagonist of Toll signalling, and demonstrate a novel Wnt activity in the fly
Original languageEnglish
Pages (from-to)746 - 749
Number of pages4
JournalNATURE
Volume437
Issue number7059
DOIs
Publication statusPublished - 29 Sept 2005

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