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Temporal Differences in Interneuron Invasion of Neocortex and Piriform Cortex during Mouse Cortical Development.

Hsiang-Wei Hsing1, Zi-Hui Zhuang1, Zhen-Xian Niou1

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Summary

Inhibitory interneurons (INs) invade the piriform cortex (PCx) earlier than the neocortex (NCx) during development. PCx projection neurons appear to regulate this distinct IN distribution pattern.

Keywords:
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Area of Science:

  • Neuroscience
  • Developmental Biology
  • Cortical Development

Background:

  • A balance between neural excitation and inhibition is crucial for brain function.
  • Inhibitory interneurons (INs) originate in the ventral telencephalon and migrate to integrate with dorsal telencephalon-derived excitatory neurons.
  • Previous research indicates INs migrate tangentially into the neocortex (NCx) and invade the cortical plate late in corticogenesis.

Purpose of the Study:

  • To investigate the developmental integration of inhibitory interneurons (INs) into the developing mouse cortex.
  • To compare the distribution and maturation timing of INs in the piriform cortex (PCx) versus the neocortex (NCx).
  • To explore the role of projection neuron properties in regulating IN distribution patterns.

Main Methods:

  • Comparative analysis of IN distribution patterns in developing mouse PCx and NCx.
  • Investigation of CXCR4 expression in INs from PCx and NCx.
  • Analysis of IN distribution in Lhx2 conditional knockout (cKO) mice, creating an ectopic PCx (ePCx) in the lateral NCx.

Main Results:

  • INs exhibit different distribution patterns in the developing PCx compared to the NCx.
  • INs invade and mature earlier in the PCx than in the NCx, potentially due to lower CXCR4 expression in PCx INs.
  • PCx-specific IN distribution patterns were observed in the ePCx of Lhx2 cKO mice, indicating regulation by projection neuron properties.

Conclusions:

  • The timing of IN invasion into the developing PCx is distinct from that of the NCx.
  • Projection neurons play a role in instructing PCx-specific IN distribution patterns.
  • These findings highlight differential developmental mechanisms governing interneuron integration in distinct cortical areas.