Clathrin adaptor AP-1 and Stratum act in parallel pathways to control Notch activation in Drosophila Sensory Organ Precursor Cells - Université de Rennes Accéder directement au contenu
Pré-Publication, Document De Travail Année : 2021

Clathrin adaptor AP-1 and Stratum act in parallel pathways to control Notch activation in Drosophila Sensory Organ Precursor Cells

Résumé

Drosophila sensory organ precursors divide asymmetrically to generate pIIa/pIIb cells whose identity relies on the differential activation of Notch at cytokinesis. While Notch is present apically and basally relative to the midbody at the pIIa-pIIb interface, only the basal pool of Notch is reported to contribute to Notch activation in the pIIa cell. Correct intra-lineage signalling requires appropriate apico-basal targeting of Notch, its ligand Delta and its trafficking partner Sanpodo. We previously reported that AP-1 and Stratum regulate the intracellular trafficking of Notch and Sanpodo from the trans -Golgi network to the basolateral membrane. Loss of AP-1 or Stratum caused mild Notch gain-of-function phenotypes. Here, we report that the concomitant loss of AP-1 and Stratum results in a much more penetrant Notch gain-of-function phenotype indicating that AP-1 and Strat control two parallel pathways. While unequal partitioning of cell fate determinants and cell polarity were unaffected, Numb-mediated symmetry breaking is impaired. We further observed increased amounts of signaling competent Notch as well as Delta and Sanpodo at the apical pIIa-pIIb interface and the loss of the basal pool of Notch. We propose that AP-1 and Stratum operate in two parallel pathways to ensure the correct apico-basal localization of Notch controlling where receptor activation takes place.
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Dates et versions

hal-03093034 , version 1 (03-01-2021)

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Karen Bellec, Mathieu Pinot, Isabelle Gicquel, Roland Le Borgne. Clathrin adaptor AP-1 and Stratum act in parallel pathways to control Notch activation in Drosophila Sensory Organ Precursor Cells. 2021. ⟨hal-03093034⟩
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