Elsevier

Developmental Biology

Volume 304, Issue 1, 1 April 2007, Pages 22-33
Developmental Biology

N-cadherin mediates cortical organization in the mouse brain

https://doi.org/10.1016/j.ydbio.2006.12.014Get rights and content
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Abstract

The cerebral cortex is a complex laminated structure generated by the sequential migration of developing neurons from the ventricular zone. One of the molecules that may play a role in cortical morphogenesis is N-cadherin since its blocking causes disruption of the ordered arrangement of cells in other neural tissues, such as the neural retina. Here, we show that when the N-cadherin gene had been conditionally deleted in the mouse cerebral cortex, the intra-cortical structures were nearly completely randomized; e.g., mitotic cells and postmitotic cells were scattered throughout the cortex without any order. These defects seemed to mainly originate from the disruption of the adherens junctions (AJs) localized in the apical end of neuroepithelial cells, where N-cadherin is normally most highly concentrated. In the absence of N-cadherin, neuroepithelial or radial glial cells could not expand their bodies or processes to span the distance between the ventricular and pial surfaces and therefore terminated them in the middle zone of the cortex. These results demonstrate that N-cadherin is essential for maintaining the normal architecture of neuroepithelial or radial glial cells and that their disruption randomizes the internal structures of the cortex.

Keywords

Adherens junction
N-cadherin
D6-Cre
Cerebral cortex
Hippocampus
Radial glial cells
Neuroepithelial cells

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