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Electroporation of Sliced Human Cortical Organoids for Studies of Gene Function
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Founder cells shape brain evolution.

Jing Liu1, Debra L Silver2

  • 1Department of Molecular Genetics and Microbiology, Duke University Medical Center, Durham, NC 27710, USA.

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Human brain expansion is linked to changes in neuroepithelial progenitor cells. A new study used great ape cerebral organoids to reveal how cell shape transitions drive the development of the human cerebral cortex.

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Area of Science:

  • Evolutionary biology
  • Developmental neuroscience
  • Comparative genomics

Background:

  • The human cerebral cortex is significantly larger and more complex than that of other primates.
  • Understanding the evolutionary mechanisms driving this expansion is a key question in neuroscience.
  • Previous research has explored genetic and cellular factors, but a comprehensive understanding remains elusive.

Purpose of the Study:

  • To investigate the cellular mechanisms underlying the expansion of the human cerebral cortex compared to other great apes.
  • To identify specific cell behaviors and transitions that may have contributed to increased cortical size during human evolution.

Main Methods:

  • Generation of cerebral organoids from pluripotent stem cells across multiple great ape species, including humans.
  • High-resolution live imaging and advanced microscopy techniques to observe progenitor cell behavior in 3D organoid cultures.
  • Quantitative analysis of neuroepithelial progenitor cell shape, division patterns, and spatial organization within developing organoids.

Main Results:

  • Significant differences in neuroepithelial progenitor cell shape dynamics were observed between human and non-human ape organoids.
  • Human progenitors exhibit distinct transitional states, adopting more elongated and apically constricted shapes compared to their ape counterparts.
  • These shape transitions correlate with altered progenitor proliferation rates and potentially influence the expansion of the cortical surface area.

Conclusions:

  • Neuroepithelial progenitor cell shape transitions are a critical factor implicated in the evolutionary expansion of the human cerebral cortex.
  • The study provides a novel cellular mechanism that helps explain the unique development of the human brain.
  • These findings open new avenues for research into the genetic and molecular regulation of cortical development and evolution.