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Science 307 (5711): 929-932

Copyright © 2005 by the American Association for the Advancement of Science

Mammalian SAD Kinases Are Required for Neuronal Polarization

Masashi Kishi,1* Y. Albert Pan,1,2* Justin Gage Crump,3{dagger} Joshua R. Sanes1,2{ddagger}

Abstract: Electrical activity in neurons is generally initiated in dendritic processes then propagated along axons to synapses, where it is passed to other neurons. Major structural features of neurons—their dendrites and axons—are thus related to their fundamental functions: the receipt and transmission of information. The acquisition of these distinct properties by dendrites and axons, called polarization, is a critical step in neuronal differentiation. We show here that SAD-A and SAD-B, mammalian orthologs of a kinase needed for presynaptic differentiation in Caenorhabditis elegans, are required for neuronal polarization. These kinases will provide entry points for unraveling signaling mechanisms that polarize neurons.

1 Department of Anatomy and Neurobiology, Washington University Medical School, St. Louis, MO 63110, USA.
2 Department of Molecular and Cellular Biology, Harvard University, Cambridge, MA 02138, USA.
3 Department of Anatomy, University of California, San Francisco, CA 94143, USA.

* These authors contributed equally to this work.

{dagger} Present address: Institute of Neuroscience, University of Oregon, Eugene, OR 97403, USA.

{ddagger} To whom correspondence should be addressed. E-mail: sanesj{at}

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