SoxNeuro and shavenbaby act cooperatively to shape denticles in the embryonic epidermis of Drosophila

Author:

Rizzo Nicholas P.1,Bejsovec Amy1

Affiliation:

1. Department of Biology, Duke University, Durham, NC 27708, USA

Abstract

During development, extracellular signals are integrated by cells to induce the transcriptional circuitry that controls morphogenesis. In the fly epidermis, Wingless (Wg)/Wnt signaling directs cells to produce either a distinctly-shaped denticle or no denticle, resulting in a segmental pattern of denticle belts separated by smooth, or "naked", cuticle. Naked cuticle results from Wg repression of shavenbaby (svb), which encodes a transcription factor required for denticle construction. We have discovered that although the svb promoter responds differentially to altered Wg levels, Svb alone cannot produce the morphological diversity of denticles found in wild-type belts. Instead, a second Wg-responsive transcription factor, SoxNeuro (SoxN), cooperates with Svb to shape the denticles. Co-expressing ectopic SoxN with svb rescued diverse denticle morphologies. Conversely, removing SoxN activity eliminated the residual denticles found in svb mutant embryos. Furthermore, several known Svb target genes are also activated by SoxN, and we have discovered two novel target genes of SoxN that are expressed in denticle-producing cells and that are regulated independently of Svb. Thus we conclude that proper denticle morphogenesis requires transcriptional regulation by both SoxN and Svb.

Funder

Office of Extramural Research, National Institutes of Health

Publisher

The Company of Biologists

Subject

Developmental Biology,Molecular Biology

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