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- W2024578750 abstract "Organisers control the patterning and growth of many tissues and organs. Correctly regulating the size of these organisers is crucial for proper differentiation to occur. Organiser activity in the epithelium of the Drosophila ovarian follicle resides in a pair of cells called polar cells. It is known that these two cells are selected from a cluster of equivalent cells. However, the mechanisms responsible for this selection are still unclear. Here, we present evidence that the selection of the two cells is not random but, by contrast, depends on an atypical two-step Notch-dependant mechanism. We show that this sequential process begins when one cell becomes refractory to Notch activation and is selected as the initial polar cell. This cell then produces a Delta signal that induces a high level of Notch activation in one other cell within the cluster. This Notch activity prevents elimination by apoptosis, allowing its selection as the second polar cell. Therefore, the mechanism used to select precisely two cells from among an equivalence group involves an inductive Delta signal that originates from one cell, itself unable to respond to Notch activation, and results in one other cell being selected to adopt the same fate. Given its properties, this two-step Notch-dependent mechanism represents a novel aspect of Notch action." @default.
- W2024578750 created "2016-06-24" @default.
- W2024578750 creator A5012529768 @default.
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- W2024578750 date "2010-08-15" @default.
- W2024578750 modified "2023-10-18" @default.
- W2024578750 title "A two-step Notch-dependant mechanism controls the selection of the polar cell pair in<i>Drosophila</i>oogenesis" @default.
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- W2024578750 doi "https://doi.org/10.1242/dev.052183" @default.
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