Cited by 80Chromosomal and Genetic VariationsNeuroinflammation and Neurodegeneration MechanismsEpigenetics and DNA Methylation

Activation of endogenous retroviruses during brain development causes an inflammatory response

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Jönsson, Marie E, Garza, Raquel, Sharma, Yogita, Petri, Rebecca, Södersten, Erik, Johansson, Jenny G, Johansson, Pia A, Atacho, Diahann AM +8 more·2021·The EMBO Journal

Abstract

Endogenous retroviruses (ERVs) make up a large fraction of mammalian genomes and are thought to contribute to human disease, including brain disorders. In the brain, aberrant activation of ERVs is a potential trigger for an inflammatory response, but mechanistic insight into this phenomenon remains lacking. Using CRISPR/Cas9-based gene disruption of the epigenetic co-repressor protein Trim28, we found a dynamic H3K9me3-dependent regulation of ERVs in proliferating neural progenitor cells (NPCs), but not in adult neurons. In vivo deletion of Trim28 in cortical NPCs during mouse brain development resulted in viable offspring expressing high levels of ERVs in excitatory neurons in the adult brain. Neuronal ERV expression was linked to activated microglia and the presence of ERV-derived proteins in aggregate-like structures. This study demonstrates that brain development is a critical period for the silencing of ERVs and provides causal in vivo evidence demonstrating that transcriptional activation of ERV in neurons results in an inflammatory response.

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Crossref · 10.15252/embj.2020106423

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  • Retrotransposon-encoded products, including viral-like proteins, double-stranded RNAs, and extrachromosomal circular DNAs, can be potent activators of the innate immune system.

    “Retrotransposon-encoded products, including viral-like proteins, double-stranded RNAs, and extrachromosomal circular DNAs, can also be potent activators of the innate immune system.”

    From The Role of Retrotransposons and Endogenous Retroviruses in Age-Dependent Neurodegenerative Disorders (2024) · cites this paper as Jönsson et al. 2021

    The Results section (“ERV-derived proteins are found in areas of microglia activation”; page unavailable) says ERV-derived double-stranded RNA can activate innate immunity. The Discussion (page unavailable) proposes ERV-derived proteins as a possible cause of inflammation, but does not establish that mechanism; our copy does not address extrachromosomal circular DNA as an immune activator. (LLM, conf=0.87)

    Experimental — accuracy not yet measured
  • Cellular products generated over the life cycle of retrotransposon activation are subject to cellular detection and clearance through the innate immune system.

    “Cellular products that are generated over the life cycle of retrotransposon activation are subject to cellular detection and clearance through the innate immune system”

    From The Role of Retrotransposons and Endogenous Retroviruses in Age-Dependent Neurodegenerative Disorders (2024) · cites this paper as Jönsson et al. 2021

    The Results section ('ERV-derived proteins are found in areas of microglia activation'; page not provided) says ERV-derived nucleic acids can activate innate immune detection. It does not establish that retrotransposon products generally undergo immune clearance; in the studied neural cells, the authors found no detectable interferon response despite ERV activation. (LLM, conf=0.85)

    Experimental — accuracy not yet measured

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Authors
Jönsson, M. E., Garza, R., Sharma, Y., Petri, R., Södersten, E., Johansson, J. G., Johansson, P. A., Atacho, D. A., Pircs, K., Madsen, S., Yudovich, D., Ramakrishnan, R., Holmberg, J., Larsson, J., Jern, P., & Jakobsson, J.
Affiliations
  • Lund University (SE)
  • Karolinska Institutet (SE)
  • Uppsala University (SE)
Corresponding author
Jakobsson, Johan
Venue
The EMBO Journal
Published
2021-03-01
Volume
40
Issue
9
Pages
e106423-e106423
ISSN
  • 0261-4189 (ISSN-L)
  • 1460-2075
OpenAlex
W3135617942
Cited by
80
References
87
Citations by year
2026: 10 · 2025: 23 · 2024: 15 · 2023: 13 · 2022: 11 · 2021: 7 · 2020: 1
FWCI
6.91
Type
journal article
Language
en
Open access
Locations
  • The EMBO Journal (publishedVersion, other-oa)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • KTH Publication Database DiVA (KTH Royal Institute of Technology) (submittedVersion, other-oa)
  • Lund University Publications (Lund University) (submittedVersion)
Funders
  • Vetenskapsrådet (2018‐02694, 2018‐03017)
  • Hjärnfonden (FO2019‐0098)
  • Cancerfonden (190326)
  • Barncancerfonden (PR2017‐0053)
  • Svenska Forskningsrådet Formas (2018‐01008)
Topics
  • Life Sciences › Agricultural and Biological Sciences › Plant Science › Chromosomal and Genetic Variations
  • Life Sciences › Neuroscience › Neurology › Neuroinflammation and Neurodegeneration Mechanisms
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Epigenetics and DNA Methylation
Keywords
endogenous retroviruses, brain development, TRIM28, H3K9me3, neural progenitor cells, microglial activation, neuroinflammation, excitatory neurons, CRISPR/Cas9 gene disruption, cortical development
MeSH terms
Tripartite Motif-Containing Protein 28, Animals, Brain, Cells, Cultured, Encephalitis, Gene Expression Regulation, Histones, Transcriptional Activation, Gene Deletion, Endogenous Retroviruses, Epigenesis, Genetic, Mice, CRISPR-Cas Systems

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