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• W1968659811 startingPage "709" @default.
• W1968659811 abstract "Defects in the epidermal growth factor receptor (EGFR) pathway can lead to aggressive tumor formation. Activation of this pathway during normal development produces multiple outcomes at the cellular level, leading to cellular differentiation and cell cycle activation. To elucidate the downstream events induced by this pathway, we used genome-wide cDNA microarray technology to identify potential EGFR targets in Drosophila oogenesis. We focused on genes for which the transcriptional responses due to EGFR pathway activation and inactivation were in opposite directions, as this is expected for genes that are directly regulated by the pathway in this tissue type. We perturbed the EGFR pathway in epithelial follicle cells using seven different genetic backgrounds. To activate the pathway, we overexpressed an activated form of the EGFR (UAS-caEGFR), and an activated form of the signal transducer Raf (UAS-caRaf); we also over- or ectopically expressed the downstream homeobox transcription factor Mirror (UAS-mirr) and the ligand-activating serine protease Rhomboid (UAS-rho). To reduce pathway activity we used loss-of-function mutations in the ligand (gurken) and receptor (torpedo). From microarrays containing 6,255 genes, we found 454 genes that responded in an opposite manner in gain-of-function and loss-of-function conditions among which are many Wingless signaling pathway components. Further analysis of two such components, sugarless and pangolin, revealed a function for these genes in late follicle cell patterning. Of interest, components of other signaling pathways were also enriched in the EGFR target group, suggesting that one reason for the pleiotropic effects seen with EGFR activity in cancer progression and development may be its ability to regulate many other signaling pathways." @default.
• W1968659811 created "2016-06-24" @default.
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• W1968659811 date "2005-02-09" @default.
• W1968659811 modified "2023-10-01" @default.
• W1968659811 title "Genome wide analysis of transcript levels after perturbation of the EGFR pathway in the<i>Drosophila</i>ovary" @default.
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• W1968659811 doi "https://doi.org/10.1002/dvdy.20318" @default.
• W1968659811 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/15704171" @default.
• W1968659811 hasPublicationYear "2005" @default.
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