Cited by 279Genetic Neurodegenerative DiseasesNeuroinflammation and Neurodegeneration MechanismsMitochondrial Function and Pathology

Cell Type-Specific Transcriptomics Reveals that Mutant Huntingtin Leads to Mitochondrial RNA Release and Neuronal Innate Immune Activation

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Lee, Hyeseung, Fenster, Robert J., Pineda, S. Sebastian, Gibbs, Whitney S., Mohammadi, Shahin, Davila-Velderrain, Jose, Garcia, Francisco J., Therrien, Martine +7 more·2020·Neuron

Abstract

The mechanisms by which mutant huntingtin (mHTT) leads to neuronal cell death in Huntington's disease (HD) are not fully understood. To gain new molecular insights, we used single nuclear RNA sequencing (snRNA-seq) and translating ribosome affinity purification (TRAP) to conduct transcriptomic analyses of caudate/putamen (striatal) cell type-specific gene expression changes in human HD and mouse models of HD. In striatal spiny projection neurons, the most vulnerable cell type in HD, we observe a release of mitochondrial RNA (mtRNA) (a potent mitochondrial-derived innate immunogen) and a concomitant upregulation of innate immune signaling in spiny projection neurons. Further, we observe that the released mtRNAs can directly bind to the innate immune sensor protein kinase R (PKR). We highlight the importance of studying cell type-specific gene expression dysregulation in HD pathogenesis and reveal that the activation of innate immune signaling in the most vulnerable HD neurons provides a novel framework to understand the basis of mHTT toxicity and raises new therapeutic opportunities.

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  • HTT gene mutations trigger a cascade of molecular events, including transcriptional dysregulation, impaired protein homoeostasis, and disrupted intracellular transport.

    “HTT gene mutations trigger a cascade of molecular events, including transcriptional dysregulation, impaired protein homoeostasis, and disrupted intracellular transport.200”

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Research works printed but not linked: 2

  1. Mohammadi S, Davila-Velderrain J, and Kellis M (2019). Multi-resolution single-cell state characterization via joint archetypal/network analysis. bioRxiv.
  2. Seabold JS, and Perktold J (2010). Statsmodels: Econometric and Statistical Modeling with Python. Paper presented at: Python in Science Conference (Austin, Texas).

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Authors
Lee, H., Fenster, R. J., Pineda, S. S., Gibbs, W. S., Mohammadi, S., Davila-Velderrain, J., Garcia, F. J., Therrien, M., Novis, H. S., Gao, F., Wilkinson, H., Vogt, T., Kellis, M., LaVoie, M. J., & Heiman, M.
Affiliations
  • Broad Institute (US)
  • Brigham and Women's Hospital (US)
  • California Institute of Technology (US)
  • CHDI Foundation (US)
Corresponding author
Heiman, Myriam
Venue
Neuron
Publisher
Elsevier BV
Published
2020-09
Volume
107
Issue
5
Pages
891-908.e8
ISSN
0896-6273 (ISSN-L)
OpenAlex
W3042822579
Cited by
279
References
96
Citations by year
2026: 40 · 2025: 45 · 2024: 60 · 2023: 47 · 2022: 49 · 2021: 31 · 2020: 6 · 2012: 1
FWCI
15.23
Type
journal article
Language
en
Open access
Locations
  • Neuron (publishedVersion)
  • PubMed (publishedVersion)
  • PubMed Central (acceptedVersion)
  • CaltechAUTHORS (California Institute of Technology) (submittedVersion)
  • DSpace@MIT (Massachusetts Institute of Technology) (submittedVersion, cc-by-nc-nd)
Funders
  • JPB Foundation
  • National Institutes of Health
  • CHDI Foundation
Topics
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Genetic Neurodegenerative Diseases
  • Life Sciences › Neuroscience › Neurology › Neuroinflammation and Neurodegeneration Mechanisms
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Mitochondrial Function and Pathology
Keywords
Huntington's disease, mutant huntingtin, PKR, medium spiny neurons, striatum, neuronal cell death, cell type-specific gene expression, innate immune signaling, neuroinflammation
MeSH terms
Huntingtin Protein, RNA, Mitochondrial, Animals, Humans, Huntington Disease, Immunity, Innate, Mutation, Neurons, Mice, Transcriptome

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