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Research Articles, Development/Plasticity/Repair

A Unique “Reversed” Migration of Neurons in the Developing Claustrum

Kota Oshima, Satoshi Yoshinaga, Ayako Kitazawa, Yuki Hirota, Kazunori Nakajima and Ken-ichiro Kubo
Journal of Neuroscience 1 February 2023, 43 (5) 693-708; DOI: https://doi.org/10.1523/JNEUROSCI.0704-22.2022
Kota Oshima
1Department of Anatomy, Keio University School of Medicine, Tokyo, 160-8582, Japan
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Satoshi Yoshinaga
1Department of Anatomy, Keio University School of Medicine, Tokyo, 160-8582, Japan
2Department of Anatomy, The Jikei University School of Medicine, Tokyo, 105-8461, Japan
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Ayako Kitazawa
1Department of Anatomy, Keio University School of Medicine, Tokyo, 160-8582, Japan
2Department of Anatomy, The Jikei University School of Medicine, Tokyo, 105-8461, Japan
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Yuki Hirota
1Department of Anatomy, Keio University School of Medicine, Tokyo, 160-8582, Japan
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Kazunori Nakajima
1Department of Anatomy, Keio University School of Medicine, Tokyo, 160-8582, Japan
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Ken-ichiro Kubo
1Department of Anatomy, Keio University School of Medicine, Tokyo, 160-8582, Japan
2Department of Anatomy, The Jikei University School of Medicine, Tokyo, 105-8461, Japan
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Abstract

The claustrum (CLA) is a cluster of neurons located between the insular cortex and striatum. Many studies have shown that the CLA plays an important role in higher brain function. Additionally, growing evidence suggests that CLA dysfunction is associated with neuropsychological symptoms. However, how the CLA is formed during development is not fully understood. In the present study, we analyzed the development of the CLA, especially focusing on the migration profiles of CLA neurons in mice of both sexes. First, we showed that CLA neurons were generated between embryonic day (E) 10.5 and E12.5, but mostly at E11.5. Next, we labeled CLA neurons born at E11.5 using the FlashTag technology and revealed that most neurons reached the brain surface by E13.5 but were distributed deep in the CLA 1 d later at E14.5. Time-lapse imaging of GFP-labeled cells revealed that some CLA neurons first migrated radially outward and then changed their direction inward after reaching the surface. Moreover, we demonstrated that Reelin signal is necessary for the appropriate distribution of CLA neurons. The switch from outward to “reversed” migration of developing CLA neurons is distinct from other migration modes, in which neurons typically migrate in a certain direction, which is simply outward or inward. Future elucidation of the characteristics and precise molecular mechanisms of CLA development may provide insights into the unique cognitive functions of the CLA.

SIGNIFICANCE STATEMENT The claustrum (CLA) plays an important role in higher brain function, and its dysfunction is associated with neuropsychological symptoms. Although psychiatric disorders are increasingly being understood as disorders of neurodevelopment, little is known about CLA development, including its neuronal migration profiles and underlying molecular mechanisms. Here, we investigated the migration profiles of CLA neurons during development and found that they migrated radially outward and then inward after reaching the surface. This switch in the migratory direction from outward to inward may be one of the brain's fundamental mechanisms of nuclear formation. Our findings enable us to investigate the relationship between CLA maldevelopment and dysfunction, which may facilitate understanding of the pathogenesis of some psychiatric disorders.

  • claustrum
  • development
  • migration
  • neuron.

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The Journal of Neuroscience: 43 (5)
Journal of Neuroscience
Vol. 43, Issue 5
1 Feb 2023
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A Unique “Reversed” Migration of Neurons in the Developing Claustrum
Kota Oshima, Satoshi Yoshinaga, Ayako Kitazawa, Yuki Hirota, Kazunori Nakajima, Ken-ichiro Kubo
Journal of Neuroscience 1 February 2023, 43 (5) 693-708; DOI: 10.1523/JNEUROSCI.0704-22.2022

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A Unique “Reversed” Migration of Neurons in the Developing Claustrum
Kota Oshima, Satoshi Yoshinaga, Ayako Kitazawa, Yuki Hirota, Kazunori Nakajima, Ken-ichiro Kubo
Journal of Neuroscience 1 February 2023, 43 (5) 693-708; DOI: 10.1523/JNEUROSCI.0704-22.2022
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Keywords

  • claustrum
  • development
  • migration
  • neuron.

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