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Journal Article
Research Support, Non-U.S. Gov't
Repulsive guidance molecule plays multiple roles in neuronal differentiation and axon guidance.
Journal of Neuroscience 2006 May 32
Repulsive guidance molecule (RGM) is a membrane-bound protein originally isolated as a guidance molecule for retinal axons. Three RGM isoforms (RGMa-RGMc) exist in vertebrates. We showed previously that RGMa is a cell-survival factor in the neuroepithelium of chick embryos that suppresses the proapoptotic activity of its receptor neogenin. In the present study, we performed gain- and loss-of-function analysis of RGMa in chick embryos to further investigate RGMa function. We found that RGMa overexpression promotes neuronal differentiation, whereas RGMa small interference RNA represses it. Similar experiments conducted at later developmental stages using retroviral vectors reveal that perturbation of RGMa expression disturbs the retinotectal projection. Our work provides the first evidence for a role for RGMs in axon guidance in vivo. In addition, these results suggest that RGMa exerts multiple functions during neural development.
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