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  • Title: Planar polarity and actin dynamics in the epidermis of Drosophila.
    Author: Kaltschmidt JA, Lawrence N, Morel V, Balayo T, Fernández BG, Pelissier A, Jacinto A, Martinez Arias A.
    Journal: Nat Cell Biol; 2002 Dec; 4(12):937-44. PubMed ID: 12447392.
    Abstract:
    Dorsal closure is a morphogenetic process involving the coordinated convergence of two epithelial sheets to enclose the Drosophila melanogaster embryo. Specialized populations of cells at the edges of each epithelial sheet, the dorsal-most epidermal cells, emit actin-based processes that are essential for the proper enclosure of the embryo. Here we show that actin dynamics at the leading edge is preceded by a planar polarization of the dorsal-most epidermal cells associated with a reorganization of the cytoskeleton. An important consequence of this planar polarization is the formation of actin-nucleating centres at the leading edge, which are important in the dynamics of actin. We show that Wingless (Wg) signalling and Jun amino-terminal kinase (JNK) signalling have overlapping but different roles in these events.
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