Related Experiment Videos
Ephrin-As and neural activity are required for eye-specific patterning during retinogeniculate mapping
Cory Pfeiffenberger1, Tyler Cutforth, Georgia Woods
1Department of Molecular, Cellular, and Developmental Biology, University of California at Santa Cruz, Santa Cruz, California 95064, USA.
Nature Neuroscience
|July 19, 2005
Summary
Ephrin-A proteins and neural activity are crucial for forming eye-specific layers in the brain. Disrupting either leads to abnormal retinal projection patterns in the dorsal lateral geniculate nucleus.
Area of Science:
- Neuroscience
- Developmental Biology
- Visual System Research
Background:
- Retinal ganglion cells (RGCs) project to the dorsal lateral geniculate nucleus (dLGN) in mammals.
- These projections initially intermingle before segregating into eye-specific layers within the dLGN.
Purpose of the Study:
- To investigate the roles of ephrin-A proteins and correlated neural activity in the patterning of eye-specific RGC layers in the dLGN.
- To understand how these factors interact to control retinogeniculate layer formation.
Main Methods:
- Analysis of mice deficient in ephrin-A2, ephrin-A3, and ephrin-A5.
- Assessment of mice lacking correlated retinal activity.
- Inhibition of correlated neural activity in ephrin mutant mice.
Main Results:
- Mice lacking specific ephrin-A proteins showed disrupted shapes and locations of eye-specific layers, despite successful segregation.
- Mice lacking correlated retinal activity failed to segregate eye-specific inputs.
- Inhibiting correlated neural activity in ephrin mutants resulted in overlapping projections in incorrect dLGN regions.
Conclusions:
- Ephrin-A proteins and correlated neural activity are essential and cooperative factors in patterning eye-specific retinogeniculate layers.
- Both molecular cues (ephrin-As) and neural activity are required for precise layer formation and targeting within the dLGN.