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Anterior-Posterior Guidance of Commissural Axons by Wnt-Frizzled Signaling
Anna I. Lyuksyutova,2Chin-Chun Lu,1Nancy Milanesio,1Leslie A. King,2Nini Guo,4Yanshu Wang,4Jeremy Nathans,4Marc Tessier-Lavigne,5*Yimin Zou1,2,3
Commissural neurons in the mammalian dorsal spinal cord sendaxons ventrally toward the floor plate, where they cross themidline and turn anteriorly toward the brain; a gradient ofchemoattractant(s) inside the spinal cord controls this turning.In rodents, several Wnt proteins stimulate the extension ofcommissural axons after midline crossing (postcrossing). Wefound that Wnt4 messenger RNA is expressed in a decreasing anterior-to-posteriorgradient in the floor plate, and that a directed source of Wnt4protein attracted postcrossing commissural axons. Commissuralaxons in mice lacking the Wnt receptor Frizzled3 displayed anterior-posteriorguidance defects after midline crossing. Thus, Wnt-Frizzledsignaling guides commissural axons along the anterior-posterioraxis of the spinal cord.
1 Department of Neurobiology, Pharmacology and Physiology, University of Chicago, Chicago, IL 60637, USA. 2 Committee on Developmental Biology, University of Chicago, Chicago, IL 60637, USA. 3 Committee on Neurobiology, University of Chicago, Chicago, IL 60637, USA. 4 Departments of Molecular Biology and Ophthalmology, Howard Hughes Medical Institute, Johns Hopkins Medical School, Baltimore, MD 21205, USA. 5 Department of Biological Sciences, Howard Hughes Medical Institute, Stanford University, Stanford, CA94305, USA.
* Present address: Genentech Inc., South San Francisco, CA94080,USA.
To whom correspondence should be addressed. E-mail: yzou{at}bsd.uchicago.edu
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