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Lmo4 and Clim1 progressively delineate cortical projection neuron subtypes during development.

Eiman Azim1, Sara J Shnider, Gustav Y Cederquist

  • 1MGH-HMS Center for Nervous System Repair, Departments of Neurosurgery and Neurology, Program in Neuroscience, Harvard Medical School, Boston, MA 02114, USA.

Cerebral Cortex (New York, N.Y. : 1991)
|April 16, 2009
PubMed
Summary

Molecular identity in the developing cerebral cortex is progressively resolved after neuronal birth. Genes like Lmo4 and Clim1 initially expressed in both callosal projection neurons (CPN) and subcerebral projection neurons (subcerebral PN) become segregated during differentiation.

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Area of Science:

  • Neuroscience
  • Developmental Biology
  • Molecular Biology

Background:

  • Neuronal subtype diversity in the cerebral cortex is crucial for brain function.
  • Early neuronal fate decisions are influenced by molecular signals.
  • Understanding the precise execution of developmental programs during postmitotic differentiation is key.

Purpose of the Study:

  • To investigate the molecular mechanisms underlying the progressive resolution of identity in distinct neuronal subtypes.
  • To determine how and when callosal projection neurons (CPN) and subcerebral projection neurons (subcerebral PN) achieve their unique molecular identities.
  • To explore potential shared evolutionary origins between layer V CPN and subcerebral PN.

Main Methods:

  • Analysis of gene expression patterns during postmitotic differentiation.
  • Focus on LIM-homeodomain-related genes Lmo4 and Clim1 in layer V neocortical neurons.
  • Comparative study of CPN and subcerebral PN molecular identity.

Main Results:

  • CPN and subcerebral PN in layer V initially share expression of Lmo4 and Clim1.
  • Expression of Lmo4 and Clim1 becomes progressively segregated into distinct neuronal subtypes during mid to late differentiation.
  • This indicates a gradual resolution of molecular identity rather than an immediate post-mitotic determination.

Conclusions:

  • Neuronal subtype identity is progressively resolved during postmitotic differentiation.
  • The shared initial expression of Lmo4 and Clim1 suggests similarities and possible shared evolutionary origins between layer V CPN and subcerebral PN.
  • This study provides insights into the dynamic process of neuronal subtype specification in the developing cerebral cortex.