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    Neuron. 2006 Jan 5;49(1):55-66.

    Doublecortin-like kinase functions with doublecortin to mediate fiber tract decussation and neuronal migration.

    Koizumi H, Tanaka T, Gleeson JG.

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    Neurogenetics Laboratory, Department of Neurosciences, University of California, San Diego, La Jolla, California 93093, USA.

    Abstract

    The potential role of doublecortin (Dcx), encoding a microtubule-associated protein, in brain development has remained controversial. Humans with mutations show profound alterations in cortical lamination, whereas in mouse, RNAi-mediated knockdown but not germline knockout shows abnormal positioning of cortical neurons. Here, we report that the doublecortin-like kinase (Dclk) gene functions in a partially redundant pathway with Dcx in the formation of axonal projections across the midline and migration of cortical neurons. Dosage-dependent genetic effects were observed in both interhemispheric connectivity and migration of cortically and subcortically derived neurons. Surprisingly, RNAi-mediated knockdown of either gene results in similar migration defects. These results indicate the Dcx microtubule-associated protein family is required for proper neuronal migration and axonal wiring.

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    PMID:
    16387639
    [PubMed - indexed for MEDLINE]

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