Trends Neurosci. 2009 May;32(5):291-301. Epub 2009 Apr 18.

Decision by division: making cortical maps.

Rakic P, Ayoub AE, Breunig JJ, Dominguez MH.

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Department of Neurobiology and Kavli Institute of Neuroscience, Yale University School of Medicine, New Haven, CT 06510, USA. pasko.rakic@yale.edu

Abstract

In the past three decades, mounting evidence has revealed that specification of the basic cortical neuronal classes starts at the time of their final mitotic divisions in the embryonic proliferative zones. This early cell determination continues during the migration of the newborn neurons across the widening cerebral wall, and it is in the cortical plate that they attain their final positions and establish species-specific cytoarchitectonic areas. Here, the development and evolutionary expansion of the neocortex is viewed in the context of the radial unit and protomap hypotheses. A broad spectrum of findings gave insight into the pathogenesis of cortical malformations and the biological bases for the evolution of the modern human neocortex. We examine the history and evidence behind the concept of early specification of neurons and provide the latest compendium of genes and signaling molecules involved in neuronal fate determination and specification.

PMID:: 19380167; [PubMed - indexed for MEDLINE]

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