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Temporal controls over cortical projection neuron fate diversity.

Esther Klingler1

  • 1Department of Basic Neurosciences, University of Geneva, 1 Rue Michel Servet, 1211, Geneva, Switzerland.

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Cortical projection neuron (PN) diversity arises from gene expression timing, not just different genes. These developmental mechanisms shape brain circuits and increase complexity in recent species.

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Area of Science:

  • Neuroscience
  • Developmental Biology
  • Genetics

Background:

  • Cortical projection neurons (PN) are crucial for environmental interaction.
  • PN exhibit heterogeneity in birthdate, layer, molecular identity, connectivity, and function.
  • This diversity is more pronounced in evolutionarily recent species, but its developmental emergence is unclear.

Purpose of the Study:

  • To investigate the mechanisms underlying the emergence of cortical projection neuron (PN) diversity during corticogenesis.
  • To understand how temporal gene expression differences contribute to PN anatomical variability.

Main Methods:

  • Analysis of gene expression patterns during neocortex development.
  • Investigating the role of time-locked gene expression and stochasticity.
  • Comparing transcriptional programs across different PN subtypes and species.

Main Results:

  • PN diversity is influenced by both time-locked determinant gene expression and early stochastic events.
  • Temporal differences in the unfolding of similar transcriptional programs contribute significantly to anatomical variability.
  • These mechanisms explain variations in PN subtypes and across species.

Conclusions:

  • Developmental timing and the sequential activation of transcriptional programs are key drivers of cortical PN diversity.
  • Understanding these mechanisms is crucial for comprehending neocortex evolution and function.
  • The study highlights how subtle temporal differences in gene expression generate significant anatomical and functional diversity.