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Significance Capicua (Cic) is a conserved transcriptional repressor involved in receptor tyrosine kinase (RTK)-dependent gene regulation. Cic controls numerous physiological and pathological processes in flies and mammals, but whether all Cic functions are connected to RTK signaling remains unclear. Here, we show that Cic represses Toll/IL-1 signaling targets inDrosophila embryos independently of RTK control. In this context, Cic functions via suboptimal DNA sites that it cannot recognize on its own. Instead, Cic binding requires the Dorsal/NF-kB protein, which enters the nucleus following Toll activation and binds next to the Cic sites. Thus, Cic exerts more diverse mechanisms of control than previously realized, raising the possibility that RTK-independent mechanisms and/or suboptimal DNA binding may also underlie Cic function in other contexts.

Capicua controls Toll/IL-1 signaling targets independently of RTK regulation