A Role for Nr-CAM in the Patterning of Binocular Visual Pathways

Scott E. Williams, Martin Grumet, David R. Colman, Mark Henkemeyer, Carol A. Mason, Takeshi Sakurai

Research output: Contribution to journalArticlepeer-review

68 Scopus citations


Retinal ganglion cell (RGC) axons diverge within the optic chiasm to project to opposite sides of the brain. In mouse, contralateral RGCs are distributed throughout the retina, whereas ipsilateral RGCs are restricted to the ventrotemporal crescent (VTC). While repulsive guidance mechanisms play a major role in the formation of the ipsilateral projection, little is known about the contribution of growth-promoting interactions to the formation of binocular visual projections. Here, we show that the cell adhesion molecule Nr-CAM is expressed by RGCs that project contralaterally and is critical for the guidance of late-born RGCs within the VTC. Blocking Nr-CAM function causes an increase in the size of the ipsilateral projection and reduces neurite outgrowth on chiasm cells in an age- and region-specific manner. Finally, we demonstrate that EphB1/ephrin-B2-mediated repulsion and Nr-CAM-mediated attraction comprise distinct molecular programs that each contributes to the proper formation of binocular visual pathways.

Original languageEnglish (US)
Pages (from-to)535-547
Number of pages13
Issue number4
StatePublished - May 18 2006

All Science Journal Classification (ASJC) codes

  • Neuroscience(all)




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