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Geniculocortical input drives genetic distinctions between primary and higher-order visual areas
Shen-Ju Chou1, Zoila Babot, Axel Leingärtner
1Molecular Neurobiology Laboratory, The Salk Institute for Biological Studies, La Jolla, CA, USA.
Science (New York, N.Y.)
|June 8, 2013
Summary
Transcription factors specify the early visual cortex. Thalamocortical axons then refine these areas, distinguishing higher-order visual regions from V1 and enabling specific functions.
Area of Science:
- Neuroscience
- Developmental Biology
- Cortical Development
Background:
- Neocortical area patterning is understood for primary visual areas (V1) via progenitor transcription factors.
- Mechanisms distinguishing higher-order visual areas (V(HO)) from V1 remain unclear.
Purpose of the Study:
- To investigate the role of thalamocortical axon (TCA) input in differentiating V1 and V(HO).
- To elucidate the multistage process of visual cortical area patterning.
Main Methods:
- Genetically deleted geniculocortical TCAs in vivo.
- Analyzed patterned gene expression differences between V1 and V(HO).
Main Results:
- Geniculocortical TCA input is required for distinguishing V1 and V(HO).
- TCA input drives patterned gene expression across all layers.
- This input is crucial for establishing area-specific functional properties.
Conclusions:
- Visual cortical area patterning involves a two-stage process.
- Initial specification by progenitor transcription factors creates an occipital field.
- Subsequent differentiation into V1 and V(HO) requires TCA input for genetic and functional specialization.
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