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Retinal Ganglion Cell Axon Wiring Establishing the Binocular Circuit
Carol Mason1,2,3,4, Nefeli Slavi4
1Department of Pathology and Cell Biology, Columbia University, New York, NY 10027, USA;
Annual Review of Vision Science
|May 13, 2020
Summary
Retinal ganglion cell (RGC) axons navigate the brain for binocular vision. This review details molecular guidance mechanisms and RGC neurogenesis, using the albino visual system as a model for axon projection. Understanding RGCs aids vision restoration.
Area of Science:
- Neuroscience
- Developmental Biology
- Ophthalmology
Background:
- Binocular vision relies on precise retinal ganglion cell (RGC) axon projections to specific brain targets.
- RGC axons either cross to the opposite brain side (decussate) or stay on the same side (ipsilateral).
- Molecular mechanisms governing this crucial axon guidance are complex and not fully understood.
Purpose of the Study:
- To review the molecular mechanisms controlling RGC axon decussation at the optic chiasm.
- To describe axon organization within the optic tract.
- To explore the role of RGC neurogenesis in establishing ipsilateral and contralateral identities.
Main Methods:
- Review of existing literature on RGC axon guidance.
- Focus on molecular signaling pathways at the optic chiasm.
- Comparative analysis using the albino visual system model.
Main Results:
- Detailed description of molecular mechanisms for RGC axon guidance and decussation.
- Explanation of how RGC neurogenesis timing and location influence axon projection.
- The albino visual system serves as a valuable model due to altered RGC projections and neurogenesis linked to melanogenesis defects.
Conclusions:
- Understanding RGC axon guidance is key to binocular vision.
- Knowledge of RGC specification into subtypes can improve stem cell differentiation for vision repair.
- Targeted RGC differentiation could enhance axon regeneration and visual center targeting.
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