Nature Cell Biology 8, 594 - 600 (2006)
Published online: 30 April 2006; | doi:10.1038/ncb1412
The NuMA-related Mud protein binds Pins and regulates spindle orientation in Drosophila neuroblastsKarsten H. Siller, Clemens Cabernard
& Chris Q. Doe
Institute of Molecular Biology, Institute of Neuroscience, Howard Hughes Medical Institute, University of Oregon, Eugene, OR 97403, USA.
Correspondence should be addressed to Chris Q. Doe cdoe@uoregon.edu PinsMudNuMALin-5aPKCPar6Par3G iMirandaProsperoAsymmetric cell division generates cell diversity during development1,
2 and regulates stem-cell self-renewal in Drosophila and mammals3,
4. In Drosophila, neuroblasts align their spindle with a cortical Partner of Inscuteable (Pins)–Gi crescent to divide asymmetrically, but the link between cortical polarity and the mitotic spindle is poorly understood. Here, we show that Pins directly binds, and coimmunoprecipitates with, the NuMA-related Mushroom body defect (Mud) protein. Pins recruits Mud to the neuroblast apical cortex, and Mud is also strongly localized to centrosome/spindle poles, in a similar way to NuMA. In mud mutants, cortical polarity is normal, but the metaphase spindle frequently fails to align with the cortical polarity axis. When spindle orientation is orthogonal to cell polarity, symmetric division occurs. We propose that Mud is a functional orthologue of mammalian NuMA and Caenorhabditis elegans Lin-5, and that Mud coordinates spindle orientation with cortical polarity to promote asymmetric cell division.
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