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Related Experiment Video

Updated: Oct 26, 2025

Differentiation of Mouse Embryonic Stem Cells into Cortical Interneuron Precursors
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Cell-Type-Specific Gene Expression in Developing Mouse Neocortex: Intermediate Progenitors Implicated in Axon

Francesco Bedogni1, Robert F Hevner2

  • 1School of Biosciences, Cardiff University, Cardiff, United Kingdom.

Frontiers in Molecular Neuroscience
|July 29, 2021
PubMed
Summary
This summary is machine-generated.

Intermediate progenitors (IPs) play a crucial role in brain development by molecularly priming new projection neurons (PNs) for axon formation and function. This study reveals IPs

Keywords:
Wnt-PCPcortical developmentepithelial-mesenchymal transitionintermediate progenitorsplanar cell polarityradial gliatouch-and-go

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Area of Science:

  • Neuroscience
  • Developmental Biology
  • Genetics

Background:

  • Projection neurons (PNs) in the cerebral cortex originate from intermediate progenitors (IPs), which develop from radial glial progenitors (RGPs).
  • Understanding the molecular mechanisms governing IP development is crucial for deciphering neocortex formation.

Purpose of the Study:

  • To profile the transcriptome of intermediate progenitors (IPs) in the embryonic mouse neocortex.
  • To identify genes and pathways critical for IP function and their role in generating projection neurons (PNs).

Main Methods:

  • Utilized transgenic Tbr2-GFP mice for cell identification.
  • Employed cell sorting and microarray analysis to profile IP transcriptomes.
  • Integrated transcriptomic data with in situ hybridization for cell-type specific gene identification.

Main Results:

  • Identified 419 RGP-selective transcripts involved in signaling, proliferation, and cell junctions.
  • Discovered 136 IP-selective genes related to axon genesis, cell polarity, and excitability.
  • Found IPs express dependence receptors, suggesting a role in competitive cell survival.

Conclusions:

  • IPs are pivotal in patterning neuronal polarization and axon differentiation before cell division.
  • IPs actively prepare nascent PNs for axogenesis, guidance, and excitability.
  • IPs contribute quantitatively to neurogenesis and qualitatively to PN maturation.