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Updated: Feb 10, 2026
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In utero Electroporation followed by Primary Neuronal Culture for Studying Gene Function in Subset of Cortical Neurons
Published on: October 8, 2010
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Differential gene regulatory plasticity between upper and lower layer cortical excitatory neurons
Lingling Yang1, Liuzeng Chen2, Chunlin Cai3
1Department of Histology and Embryology, School of Basic Medical Sciences, Anhui Medical University, Anhui 230022, China.
Molecular and Cellular Neurosciences
|May 27, 2018
Summary
Activity-dependent gene regulation in the neocortex is specific to upper layer (UL) neurons, not lower layer (LL) neurons. This difference is attributed to epigenetic modifications, impacting neocortical development.
Area of Science:
- Neuroscience
- Developmental Biology
- Epigenetics
Background:
- Neocortical projection neurons are divided into upper layer (UL) and lower layer (LL) subtypes.
- Thalamic afferent activity influences layer-specific gene expression crucial for neocortical development.
Purpose of the Study:
- To investigate the layer-specific regulation of gene expression by afferent activity in the neocortex.
- To explore the role of epigenetic modifications in differential gene regulation between UL and LL neurons.
Main Methods:
- In vivo experiments to assess gene expression in the absence of afferent activity.
- Transcriptional assays to evaluate gene promoter binding and activity.
- Chromatin analysis to identify heterochromatin markers in different neuronal layers.
Main Results:
- Immediate early genes (EGR1, c-FOS) were downregulated in all cortical layers without afferent activity.
- EGR1 and c-FOS can bind to promoters of UL- and LL-specific genes.
- LL neurons exhibit higher levels of heterochromatin markers (H3K9m3, H4K20m3) than UL neurons.
Conclusions:
- Activity-dependent gene regulation in the neocortex is primarily confined to UL neurons.
- Differential epigenetic modifications, specifically heterochromatin formation in LL neurons, underlie this layer-specific sensitivity to activity.
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