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D-cbl, a negative regulator of the Egfr pathway, is required for dorsoventral patterning in Drosophila oogenesis.

TitleD-cbl, a negative regulator of the Egfr pathway, is required for dorsoventral patterning in Drosophila oogenesis.
Publication TypeJournal Article
Year of Publication2000
AuthorsPai LM, Barcelo G, Sch├╝pbach T
JournalCell
Volume103
Issue1
Pagination51-61
Date Published2000 Sep 29
ISSN0092-8674
KeywordsAlleles, Animals, Body Patterning, Clone Cells, DNA Mutational Analysis, Drosophila, Drosophila Proteins, Embryonic and Fetal Development, Female, Gene Expression Regulation, Enzymologic, Insect Proteins, Membrane Proteins, Mutation, Nerve Tissue Proteins, Oogenesis, Ovarian Follicle, Ovum, Pregnancy, Protein Tyrosine Phosphatases, Proto-Oncogene Proteins, Proto-Oncogene Proteins c-cbl, Receptor, Epidermal Growth Factor, Signal Transduction, Sulfotransferases, Transforming Growth Factor alpha, Transforming Growth Factors
Abstract

During Drosophila oogenesis, asymmetrically localized Gurken activates the EGF receptor (Egfr) and determines dorsal follicle cell fates. Using a mosaic follicle cell system we have identified a mutation in the D-cbl gene which causes hyperactivation of the Egfr pathway. Cbl proteins are known to downregulate activated receptors. We find that the abnormal Egfr activation is ligand dependent. Our results show that the precise regulation of Egfr activity necessary to establish different follicle cell fates requires two levels of control. The localized ligand Gurken activates Egfr to different levels in different follicle cells. In addition, Egfr activity has to be repressed through the activity of D-cbl to ensure the absence of signaling in the ventral most follicle cells.

Alternate JournalCell


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