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Articles

The first retinal axon growth in the mouse optic chiasm: axon patterning and the cellular environment

RC Marcus and CA Mason
Journal of Neuroscience 1 October 1995, 15 (10) 6389-6402; DOI: https://doi.org/10.1523/JNEUROSCI.15-10-06389.1995
RC Marcus
Department of Pathology, College of Physicians and Surgeons, Columbia University, New York, New York 10032, USA.
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CA Mason
Department of Pathology, College of Physicians and Surgeons, Columbia University, New York, New York 10032, USA.
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Abstract

The retinofugal pathway is a useful model for axon guidance because fibers from each eye project to targets on both sides of the brain. Studies using static and real time analyses in mice at E15-17 demonstrated that uncrossed axons from ventrotemporal retina diverge from crossed axons in the optic chiasm, where specialized resident cells may direct divergence. Other studies, however, suggest that pioneering uncrossed retinal axons derive from a different retinal region, take a different course, and enter the ipsilateral optic tract independent of fiber-fiber interactions. We examine these differences by dye-labeling the earliest optic axons and immunocytochemically identifying cells in their path. The first optic axons arising from dorsocentral retina, enter the diencephalon at E12.5. All axons initially grow caudally, lateral to a radial glial palisade. In contrast to later growing axons, early uncrossed axons enter the ipsilateral optic tract directly. Crossed axons enter the glial palisade and course medially, then anteriorly, in a pathway corresponding to the border of an early neuronal population that expresses SSEA-1, CD44, and beta-tubulin. Axon patterning occurs independent of fiber-fiber interactions from both eyes, as the first uncrossed axons enter the optic tract before crossed ones from opposite eye. These analysis, in conjunction with our previous studies during the principal period of retinal axon growth in the diencephalon, suggest that the adult visual projection arises from age-dependent variations in the types and relative contribution of cues along the path through the emerging optic chiasm.

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The Journal of Neuroscience: 15 (10)
Journal of Neuroscience
Vol. 15, Issue 10
1 Oct 1995
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The first retinal axon growth in the mouse optic chiasm: axon patterning and the cellular environment
RC Marcus, CA Mason
Journal of Neuroscience 1 October 1995, 15 (10) 6389-6402; DOI: 10.1523/JNEUROSCI.15-10-06389.1995

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The first retinal axon growth in the mouse optic chiasm: axon patterning and the cellular environment
RC Marcus, CA Mason
Journal of Neuroscience 1 October 1995, 15 (10) 6389-6402; DOI: 10.1523/JNEUROSCI.15-10-06389.1995
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