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Migration and function of glia in the developing Drosophila eye
1Laboratory of Developmental Neurogenetics, Rockefeller University, New York, NY 10021, USA.
Development (Cambridge, England)
|July 7, 1999
Summary
Retinal basal glia (RBG) are crucial for guiding photoreceptor axons into the optic stalk in Drosophila. These glial cells are attracted to the eye disc via chemotaxis, not axon contact, and guide axons through local interactions.
Area of Science:
- Neuroscience
- Developmental Biology
- Cell Biology
Background:
- Glial cells are known to play roles in axon tract formation across species.
- The specific function of glial cells in axon guidance is context-dependent.
- Retinal basal glia (RBG) in Drosophila were previously thought to migrate along photoreceptor axons, limiting their role in guidance.
Purpose of the Study:
- To investigate the role of retinal basal glia (RBG) in Drosophila photoreceptor axon guidance.
- To determine the mechanism by which RBG migrate into the eye disc.
- To elucidate the specific function of RBG in directing photoreceptor axons towards the optic stalk.
Main Methods:
- Genetic manipulation to alter glial cell presence and photoreceptor axon formation.
- Microscopy to observe glial cell migration and axon pathfinding.
- Analysis of axon entry into the optic stalk in wild-type and mutant conditions.
Main Results:
- RBG migrate into the eye disc independently of photoreceptor axons, suggesting chemotactic attraction.
- In the absence of RBG, photoreceptor axons grow but fail to enter the optic stalk.
- A small number of RBG near the optic stalk entry are sufficient to guide axons.
Conclusions:
- RBG are essential for photoreceptor axon guidance into the optic stalk, not for axonal outgrowth.
- Glial cell migration into the eye disc is likely mediated by chemotaxis.
- RBG guide photoreceptor axons through localized interactions at the optic stalk entry point.