Spaetzle regulates the shape of the Dorsal gradient in the Drosophila embryo.
Dorsal-ventral polarity of the Drosophila embryo is established by a nuclear gradient of Dorsal protein, generated by successive gurken-Egfr and spaetzle-Toll signaling. Overexpression of extracellular Spaetzle dramatically reshapes the Dorsal gradient: the normal single peak is broadened and then refined to two distinct peaks of nuclear Dorsal, to produce two ... ventral furrows. This partial axis duplication, which mimics the ventralized phenotype caused by reduced gurken-Egfr signaling, arises from events in the perivitelline fluid of the embryo and occurs at the level of Spaetzle processing or Toll activation. The production of two Dorsal peaks is addressed by a model that invokes action of a diffusible inhibitor, which is proposed to normally regulate the slope of the Dorsal gradient.
Mesh Terms:
Animals, Body Patterning, Drosophila Proteins, Drosophila melanogaster, Female, Gene Expression Regulation, Developmental, Gene Expression Regulation, Enzymologic, Insect Proteins, Membrane Glycoproteins, Oogenesis, Receptor, Epidermal Growth Factor, Receptors, Cell Surface, Signal Transduction, Sulfotransferases, Toll-Like Receptors, Transforming Growth Factor alpha, Transforming Growth Factors
Animals, Body Patterning, Drosophila Proteins, Drosophila melanogaster, Female, Gene Expression Regulation, Developmental, Gene Expression Regulation, Enzymologic, Insect Proteins, Membrane Glycoproteins, Oogenesis, Receptor, Epidermal Growth Factor, Receptors, Cell Surface, Signal Transduction, Sulfotransferases, Toll-Like Receptors, Transforming Growth Factor alpha, Transforming Growth Factors
Development
Date: Jun. 01, 2001
PubMed ID: 11493550
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