Regulation of furrow progression in the Drosophila eye by cAMP-dependent protein kinase A

David I. Strutt, Volker Wiersdorff, Marek Mlodzik

Research output: Contribution to journalArticlepeer-review

120 Scopus citations

Abstract

THE earliest physical sign of differentiation in the Drosophila retina is the passage of the morphogenetic furrow across the epithelium of the eye disc1, 2. Secreted factors encoded by hedgehog (hh)3–7 and decapentaplegic (dpp)8–10 have been implicated in propagation of the furrow11, 12 and the subsequent initiation of photoreceptor differentiation. The morphogenetic furrow initiates at the posterior edge of the third larval instar eye imaginal disc. Its continued progression towards the anterior is believed to depend upon secretion of Hh protein by the differentiating clusters of photoreceptors that emerge posterior to the moving furrow11, 12. This progression is marked by the initiation of expression of the transforming growth factor-β homologue Dpp in cells entering the furrow anteriorly, and loss of dpp expression in cells emerging posteriorly16, 17. Although the transmembrane protein encoded by the patched gene has been genetically implicated as the Hh receptor12, 18–20, the intercellular signalling pathways involved in these inductive processes remain uncharacterized. Here we show that the catalytic subunit of cyclic AMP-dependent protein kinase A (Pka-C1)13–15 is required for the correct spatial regulation of dpp expression during eye development. Loss of Pka-C1 function is sufficient to produce an ectopic morphogenetic wave marked by premature ectopic photoreceptor differentiation and non-autonomous propagation of dpp expression. Our results indicate that Pka-C1 lies in a signalling pathway that controls the orderly temporal progression of differentiation across the eye imaginal disc.

Original languageEnglish
Pages (from-to)705-709
Number of pages5
JournalNature
Volume373
Issue number6516
DOIs
StatePublished - 23 Feb 1995
Externally publishedYes

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