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Open Access Highly Accessed Research article

Reelin expression during embryonic development of the pig brain

Karsten B Nielsen1*, Annette Søndergaard1, Marianne G Johansen1, Kirsten Schauser2, Morten Vejlsted2, Anders L Nielsen1, Arne L Jørgensen1 and Ida E Holm3

Author Affiliations

1 Institute of Human Genetics, University of Aarhus, Bartholin Building 1240, Wilhelm Meyers Allé, 8000 Aarhus C, Denmark

2 University of Copenhagen, IBHV, Groennegaardsvej 7, 1870 Frederiksberg C, Denmark

3 Department of Pathology, Aalborg Hospital, Aarhus University Hospital, Aalborg, Denmark

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BMC Neuroscience 2010, 11:75  doi:10.1186/1471-2202-11-75

Published: 15 June 2010

Abstract

Background

Reelin is an extracellular glycoprotein of crucial importance in the developmental organisation of neurons in the mammalian cerebral cortex and other laminated brain regions. The pig possesses a gyrencephalic brain that bears resemblance to the human brain. In order to establish an animal model for neuronal migration disorders in the pig, we have studied the expression pattern and structure of Reelin during pig brain development.

Results

We determined the sequence of pig Reelin mRNA and protein and identified a high degree of homology to human Reelin. A peak in Reelin mRNA and protein expression is present during the period of major neurogenesis and neuronal migration. This resembles observations for human brain development. Immunohistochemical analysis showed the highest expression of Reelin in the Cajal-Reztius cells of the marginal zone, in resemblance with observations for the developing brain in humans and other mammalian species.

Conclusions

We conclude that the pig might serve as an alternative animal model to study Reelin functions and that manipulation of the pig Reelin could allow the establishment of an animal model for human neuronal migration disorders.