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Cerebral Cortex Advance Access published online on April 20, 2005
Cerebral Cortex, doi:10.1093/cercor/bhi092
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© The Author 2005. Published by Oxford University Press. All rights reserved. For permissions, please e-mail: journals.permissions@oupjournals.org

Article

Role of the Protomap and Target-derived Signals in the Development of Intrahemispheric Connections

Wanzhu Bai 1, Mami Ishida 2, Masaru Okabe 3, and Yasuyoshi Arimatsu 2*

1 Mitsubishi Kagaku Institute of Life Sciences, 11 Minamiooya, Machida, Tokyo 194-8511, Japan; Present address: Laboratory for Neural Architecture, RIKEN Brain Science Institute, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
2 Mitsubishi Kagaku Institute of Life Sciences, 11 Minamiooya, Machida, Tokyo 194-8511, Japan
3 Genome Information Research Center, Osaka University, 3-1 Yamadaoka, Suita, Osaka 565-0871, Japan

* To whom correspondence should be addressed.
Yasuyoshi Arimatsu, E-mail: Ispr{at}libra.Is.m-kagaku.co.jp


  Abstract

Mechanisms intrinsic to the early cerebral cortex have been implicated in the establishment of cortical area identity. However, the extent to which the cortical protomap contributes to the formation of highly complex intrahemispheric connections remains obscure. Mechanisms by which postmitotic neurons establish correct corticocortical connections later in corticogenesis also remain to be elucidated. Here, we used a new transplantation method, employing donor tissue harvested from enhanced green fluorescent protein-expressing rats, to show that cortical progenitors are regionally specified for connectional potential and that this controls the development of specific intrahemispheric projections. The acquisition of connectional capacity relies on positional cues within the cortical primordium, but is independent of thalamic inputs. In addition, since cortical neurons developing in organotypic slice culture extended axons more prominently into their normal cortical target tissues than into non-target tissues, we suggest that cortical neurons respond to specific signals derived from their cortical targets.

Keywords: cortical specification; corticocortical connections; latexin; neuronal birth; rat; transplantation.
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