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Research Articles, Cellular/Molecular

Lunatic Fringe-GFP Marks Lamina-Specific Astrocytes That Regulate Sensory Processing

Ekin Su Akdemir, Junsung Woo, Navish A. Bosquez Huerta, Brittney Lozzi, Andrew K. Groves, Akdes Serin Harmanci and Benjamin Deneen
Journal of Neuroscience 26 January 2022, 42 (4) 567-580; DOI: https://doi.org/10.1523/JNEUROSCI.1392-21.2021
Ekin Su Akdemir
1Program in Developmental Biology, Baylor College of Medicine, Houston, Texas 77030
2Center for Cell and Gene Therapy, Baylor College of Medicine, Houston, Texas 77030
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Junsung Woo
2Center for Cell and Gene Therapy, Baylor College of Medicine, Houston, Texas 77030
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Navish A. Bosquez Huerta
1Program in Developmental Biology, Baylor College of Medicine, Houston, Texas 77030
2Center for Cell and Gene Therapy, Baylor College of Medicine, Houston, Texas 77030
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  • ORCID record for Navish A. Bosquez Huerta
Brittney Lozzi
2Center for Cell and Gene Therapy, Baylor College of Medicine, Houston, Texas 77030
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Andrew K. Groves
1Program in Developmental Biology, Baylor College of Medicine, Houston, Texas 77030
3Department of Neuroscience, Baylor College of Medicine, Houston, Texas 77030
4Department of Human and Molecular Genetics, Baylor College of Medicine, Houston, Texas 77030
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Akdes Serin Harmanci
5Department of Neurosurgery, Baylor College of Medicine, Houston, Texas 77030
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Benjamin Deneen
1Program in Developmental Biology, Baylor College of Medicine, Houston, Texas 77030
2Center for Cell and Gene Therapy, Baylor College of Medicine, Houston, Texas 77030
3Department of Neuroscience, Baylor College of Medicine, Houston, Texas 77030
5Department of Neurosurgery, Baylor College of Medicine, Houston, Texas 77030
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Abstract

Astrocytes are the most abundant glial cell in the brain and perform a wide range of tasks that support neuronal function and circuit activities. There is emerging evidence that astrocytes exhibit molecular and cellular heterogeneity; however, whether distinct subpopulations perform these diverse roles remains poorly defined. Here we show that the Lunatic Fringe-GFP (Lfng-GFP) bacteria artificial chromosome mouse line from both sexes specifically labels astrocyte populations within lamina III and IV of the dorsal spinal cord. Transcriptional profiling of Lfng-GFP+ astrocytes revealed unique molecular profiles, featuring an enriched expression of Notch- and Wnt- pathway components. Leveraging CRE-DOG viral tools, we ablated Lfng-GFP+ astrocytes, which decreased neuronal activity in lamina III and IV and impaired mechanosensation associated with light touch. Together, our findings identify Lfng-GFP+ astrocytes as a unique subpopulation that occupies a distinct anatomic location in the spinal cord and directly contributes to neuronal function and sensory responses.

SIGNIFICANCE STATEMENT Astrocytes are the most abundant glial cell in the CNS, and their interactions with neurons are essential for brain function. However, understanding the functional diversity of astrocytes has been hindered because of the lack of reporters that mark subpopulations and genetic tools for accessing them. We discovered that the Lfng-GFP reporter mouse labels a laminae-specific subpopulation of astrocytes in the dorsal spinal cord and that ablation of these astrocytes reduces glutamatergic synapses. Further analysis revealed that these astrocytes have a role in maintaining sensory-processing circuity related to light touch.

  • astrocyte
  • circuit activities
  • glia
  • sensory processing
  • spinal cord

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The Journal of Neuroscience: 42 (4)
Journal of Neuroscience
Vol. 42, Issue 4
26 Jan 2022
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Lunatic Fringe-GFP Marks Lamina-Specific Astrocytes That Regulate Sensory Processing
Ekin Su Akdemir, Junsung Woo, Navish A. Bosquez Huerta, Brittney Lozzi, Andrew K. Groves, Akdes Serin Harmanci, Benjamin Deneen
Journal of Neuroscience 26 January 2022, 42 (4) 567-580; DOI: 10.1523/JNEUROSCI.1392-21.2021

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Lunatic Fringe-GFP Marks Lamina-Specific Astrocytes That Regulate Sensory Processing
Ekin Su Akdemir, Junsung Woo, Navish A. Bosquez Huerta, Brittney Lozzi, Andrew K. Groves, Akdes Serin Harmanci, Benjamin Deneen
Journal of Neuroscience 26 January 2022, 42 (4) 567-580; DOI: 10.1523/JNEUROSCI.1392-21.2021
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Keywords

  • astrocyte
  • circuit activities
  • glia
  • sensory processing
  • spinal cord

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