The cell morphogenesis gene SPIRRIG in Arabidopsis encodes a WD/BEACH domain protein |
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Authors: | Rainer Saedler,Marc Jakoby,Birger Marin,Elena Galiana-Jaime, Martin Hü lskamp |
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Affiliation: | University of Cologne, Botanical Institute, Gyrhofstr. 15, 50931 Cologne, Germany |
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Abstract: | WD40/BEACH domain proteins have been implicated in membrane trafficking and membrane composition events in Dictyostelium and Drosophila . In this paper, we show that the Arabidopsis SPIRRIG ( SPI ) gene encodes a WD40/BEACH domain protein. The cellular analysis revealed fragmented vacuoles in root hairs similar to those found in the corresponding Dictyostelium mutants, suggesting a related cellular function. The phenotypic analysis revealed that spi mutants share all phenotypic aspects of mutants in the actin polymerization-regulating ARP2/3 pathway, including distorted trichomes, less lobing of epidermal pavement cells, disconnected epidermal cells on various organs, and shorter root hairs. This complete phenotypic overlap suggests that this WD40/BEACH domain protein and the actin-regulating ARP2/3 pathway are involved in similar growth processes. |
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Keywords: | SPIRRIG WD40/BEACH domain morphogenesis Arabidopsis actin trichomes |
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