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In Drosophila, the dorsal-ventral polarity of the egg chamber depends on the localization of the oocyte nucleus and the gurken RNA to the dorsal-anterior corner of the oocyte. Gurken protein presumably acts as a ligand for the Drosophila EGF receptor (torpedo/DER) expressed in the somatic follicle cells surrounding the oocyte. cornichon is a gene required(More)
Cell-cell interactions in the Drosophila ovary play a crucial role in the establishment of dorsoventral polarity of both the egg shell and the future embryo. Torpedo/DER (top/DER), a homolog of the vertebrate epidermal growth factor receptor, is required for this signaling process in the somatic cells of the ovary. In contrast, gurken (grk), which also(More)
The establishment of anterior-posterior and dorsal-ventral polarity of the Drosophila egg and embryo depends on the function of the genes gurken, cornichon and Egfr (Drosophila epidermal growth factor receptor homolog). These genes encode components of a signal transduction pathway that transmits information between the germline cells and the somatic(More)
The Drosophila gene gurken participates in a signaling process that occurs between the germ line and the somatic cells (follicle cells) of the ovary. This process is required for correct patterning of the dorsoventral axis of both the egg and the embryo. gurken produces a spatially localized transcript which encodes a TGF-alpha-like molecule(More)
Three Drosophila genes homologous to the Ha-ras probe were isolated and mapped to positions 85D, 64B, and 62B on chromosome 3. Two of these genes (termed Dras 1 and Dras 2) were sequenced. In the case of Dras 1, which contains multiple introns, a cDNA clone was isolated and sequenced. In the case of Dras2, the nucleotide sequence fo the genomic clone was(More)
By differential hybridization, we identified a number of genes in Saccharomyces cerevisiae that are activated by addition of cyclic AMP (cAMP) to cAMP-depleted cells. A majority, but not all, of these genes encode ribosomal proteins. While expression of these genes is also induced by addition of the appropriate nutrient to cells starved for a nitrogen(More)
During oogenesis in Drosophila, mRNAs encoding determinants required for the polarization of egg and embryo become localized in the oocyte in a spatially restricted manner. The TGF-alpha like signaling molecule Gurken has a central role in the polarization of both body axes and the corresponding mRNA displays a unique localization pattern, accumulating(More)
spoonbill is a Drosophila female-sterile mutation, which interferes with normal egg patterning during oogenesis. Previous analyzes linked the mutation to a number of seemingly unrelated pathways, including GRK/EGFR and DPP, two major pathways essential for Drosophila and vertebrate development. Further work suggested that spoonbill may also function in(More)
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