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The control of neuronal identity in the developing cerebral cortex
1Department of Biological Sciences, Stanford University, California 94305.
Current Opinion in Neurobiology
|February 1, 1992
Summary
Cortical neuron development involves progressive cell fate restriction. Positional cues, not birth date, determine area-specific identity in the developing cerebral cortex.
Area of Science:
- Neuroscience
- Developmental Biology
- Cell Biology
Background:
- Cerebral cortical development involves progressive restriction of cell fates.
- Cortical precursors are multipotent, generating progeny in diverse cortical areas and layers.
Purpose of the Study:
- To investigate the progressive restriction of cell fates during cerebral cortical development.
- To understand the roles of lineage, birth date, and positional cues in determining neuronal identity.
Main Methods:
- Cell lineage tracing experiments.
- Neuronal transplantation studies.
- Analysis of neuronal birth dates and laminar positions.
Main Results:
- Cortical precursors demonstrate multipotency, with progeny found in different cortical areas and layers.
- Young neurons commit early to laminar positions, correlated with their birth date.
- Neurons in distinct neocortical areas maintain equipotentiality, indicating positional cues dictate area-specific identity.
Conclusions:
- Neuronal cell fate in the cerebral cortex is progressively restricted during development.
- Positional cues are critical for establishing area-specific neuronal identity, overriding early laminar commitment.
- Understanding these developmental mechanisms is key to neurobiology.