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Cadherin expression in the somatosensory cortex: evidence for a combinatorial molecular code at the single-cell level
K Krishna-K1, N Hertel, C Redies
1University of Jena School of Medicine, Teichgraben 7, D-07743 Jena, Germany.
Neuroscience
|December 7, 2010
Summary
Cadherin genes in mouse brains exhibit layer-specific expression patterns. Combinatorial expression of multiple cadherins in single neurons suggests a role in specifying neuronal complexity.
Area of Science:
- Neuroscience
- Molecular Biology
- Genetics
Background:
- Cadherin superfamily genes are crucial for vertebrate brain development and function.
- Understanding cadherin expression is key to deciphering neuronal diversity.
Purpose of the Study:
- To map the in situ expression patterns of specific cadherins and delta-protocadherins in the adult mouse primary somatosensory cortex.
- To investigate the combinatorial expression of these genes in individual neurons.
Main Methods:
- In situ hybridization to map gene expression.
- Tyramide-based double-fluorescence in situ hybridization (FISH) to analyze co-expression in single neurons.
Main Results:
- All studied cadherins (5 classic, 8 delta-protocadherins) displayed layer-specific expression in the primary somatosensory cortex.
- Some cadherins marked specific cell subsets, while others were broadly expressed across layers.
- Most neurons co-expressed multiple cadherins in various combinations, forming a complex combinatorial code.
Conclusions:
- The combinatorial expression of cadherin genes provides a molecular mechanism for specifying the vast diversity of cortical neurons.
- This cadherin code likely contributes to the intricate organization and function of the cerebral cortex.
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