In the Drosophila leg disc, wingless (wg) and decapentaplegic (dpp) are expressed in a ventral-anterior and dorsal-anterior stripe of cells, respectively. This pattern of expression is essential for proper limb development. While the Hedgehog (Hh) pathway regulates dpp and wg expression in the anterior-posterior (A/P) axis, mechanisms specifying their expression in the dorsal-ventral (D/V) axis are not well understood. We present evidence that slimb mutant clones in the disc deregulate wg and dpp expression in the D/V axis. This suggests for the first time that their expression in the D/V axis is actively regulated during imaginal disc development. Furthermore, slimb is unique in that it also deregulates wg and dpp in the A/P axis. The misexpression phenotypes of slimb- clones indicate that the regulation of wg and dpp expression is coordinated in both axes, and that slimb plays an essential role in integrating A/P and D/V signals for proper patterning during development. Our genetic analysis further reveals that slimb intersects the A/P pathway upstream of smoothened (smo).
slimb coordinates wg and dpp expression in the dorsal-ventral and anterior-posterior axes during limb development
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N.A. Theodosiou, S. Zhang, W.Y. Wang, T. Xu; slimb coordinates wg and dpp expression in the dorsal-ventral and anterior-posterior axes during limb development. Development 1 September 1998; 125 (17): 3411–3416. doi: https://doi.org/10.1242/dev.125.17.3411
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