Tbr2-positive intermediate (basal) neuronal progenitors safeguard cerebral cortex expansion by controlling amplification of pallial glutamatergic neurons and attraction of subpallial GABAergic interneurons

Alessandro Sessa, Chai An Mao, Gaia Colasante, Alessandro Nini, William H. Klein, Vania Broccoli

Research output: Contribution to journalArticle

Abstract

Little is known about how, during its formidable expansion in development and evolution, the cerebral cortex is able tomaintain the correct balance between excitatory and inhibitory neurons. In fact, while the former are born within the cortical primordium, the latter originate outward in the ventral pallium. Therefore, it remains to be addressed how these two neuronal populations might coordinate their relative amounts in order to build a functional cortical network. Here, we show that Tbr2-positive cortical intermediate (basal) neuronal progenitors (INPs) dictate the migratory route and control the amount of subpallial GABAergic interneurons in the subventricular zone (SVZ) through a non-cell-autonomous mechanism. In fact, Tbr2 interneuron attractive activity is moderated by Cxcl12 chemokine signaling, whose forced expression in the Tbr2 mutants can rescue, to some extent, SVZ cell migration. We thus propose that INPs are able to control simultaneously the increase of glutamatergic and GABAergic neuronal pools, thereby creating a simple way to intrinsically balance their relative accumulation.

Original languageEnglish
Pages (from-to)1816-1826
Number of pages11
JournalGenes and Development
Volume24
Issue number16
DOIs
Publication statusPublished - Aug 15 2010

Keywords

  • Basal progenitors
  • Cell migration
  • Cerebral cortex
  • Intermediate neural progenitors
  • Interneurons
  • Neurogenesis

ASJC Scopus subject areas

  • Genetics
  • Developmental Biology
  • Medicine(all)

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