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Reelin expression during embryonic brain development in lacertilian lizards
A M Goffinet1, I Bar, B Bernier
1Neurobiology Unit, University of Namur School of Medicine, B-5000 Namur, Belgium. Andre.Goffinet@fundp.ac.be
The Journal of Comparative Neurology
|October 26, 1999
Summary
Reelin expression in lizard brains reveals conserved developmental patterns and unique cortical features, suggesting its crucial role in brain evolution.
Area of Science:
- Neuroscience
- Developmental Biology
- Evolutionary Biology
Background:
- Reelin is a crucial signaling molecule in neuronal development.
- Understanding reelin's role across species provides insights into brain evolution.
Purpose of the Study:
- To investigate reelin mRNA and protein expression during embryonic brain development in lacertilian lizards.
- To compare reelin expression patterns in lizards with those in other vertebrates, particularly mammals.
Main Methods:
- Radioactive in situ hybridization to detect reelin mRNA.
- Immunohistochemistry to visualize reelin protein localization.
Main Results:
- High reelin expression was observed in the olfactory bulb, lateral cortex, marginal zone, and subplate neurons.
- Distinct reelin expression patterns were noted in the dorsal ventricular ridge, diencephalon, tectum, and cerebellum.
- Lizard cortical reelin expression, including in subplate neurons, differs from mammals, suggesting evolutionary convergence.
Conclusions:
- Reelin expression patterns in lizards show both conserved and divergent features compared to mammals.
- The unique reelin expression in lizard cortical development may contribute to evolutionary convergence in brain structure.
- The reelin signaling pathway likely played a significant role in the evolution of the cortex.