Cited by 1,752interferon and immune responsesImmune Response and InflammationDNA Repair Mechanisms

cGAS surveillance of micronuclei links genome instability to innate immunity

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Mackenzie, Karen J., Carroll, Paula, Martin, Carol-Anne, Murina, Olga, Fluteau, Adeline, Simpson, Daniel J., Olova, Nelly, Sutcliffe, Hannah +9 more·2017·Nature

Abstract

DNA is strictly compartmentalized within the nucleus to prevent autoimmunity; despite this, cyclic GMP-AMP synthase (cGAS), a cytosolic sensor of double-stranded DNA, is activated in autoinflammatory disorders and by DNA damage. Precisely how cellular DNA gains access to the cytoplasm remains to be determined. Here, we report that cGAS localizes to micronuclei arising from genome instability in a mouse model of monogenic autoinflammation, after exogenous DNA damage and spontaneously in human cancer cells. Such micronuclei occur after mis-segregation of DNA during cell division and consist of chromatin surrounded by its own nuclear membrane. Breakdown of the micronuclear envelope, a process associated with chromothripsis, leads to rapid accumulation of cGAS, providing a mechanism by which self-DNA becomes exposed to the cytosol. cGAS is activated by chromatin, and consistent with a mitotic origin, micronuclei formation and the proinflammatory response following DNA damage are cell-cycle dependent. By combining live-cell laser microdissection with single cell transcriptomics, we establish that interferon-stimulated gene expression is induced in micronucleated cells. We therefore conclude that micronuclei represent an important source of immunostimulatory DNA. As micronuclei formed from lagging chromosomes also activate this pathway, recognition of micronuclei by cGAS may act as a cell-intrinsic immune surveillance mechanism that detects a range of neoplasia-inducing processes.

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Crossref · 10.1038/nature23449

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  • Intrinsic self-dsDNA released into the cytosol from nucleus or mitochondrion due to cellular or mitochondrial stress can bind to cGAS and activate the cGAS-STING pathway.

    “Besides the exogenous dsDNA released by virus or bacterial, intrinsic self-dsDNA released into the cytosol from nucleus or mitochondrion due to cellular or mitochondrial stress can also bind to cGAS and activate cGAS-STING pathway.400,401”

    From Role of neuroinflammation in neurodegeneration development (2023) · cites this paper as [400]

    The paper’s Abstract reports that breakdown of micronuclear envelopes exposes nuclear self-DNA to cGAS, which activates signaling through STING. It notes that mitochondrial DNA is normally compartmentalized, but does not establish that mitochondrial stress releases it into the cytosol or activates this pathway. (LLM, conf=0.88)

    Experimental — accuracy not yet measured
  • cGAS localizes to approximately half of all micronuclei.

    “We found a striking localization of cGAS to approximately half of all micronuclei as previously observed22,23.”

    From Chromosomal instability drives metastasis through a cytosolic DNA response (2018) · cites this paper as [23]

    The paper reports that cGAS localizes to micronuclei, but its quantified result is 83.3 ± 1.4% GFP-cGAS-positive micronuclei in RNase H2-deficient mouse fibroblasts (Abstract, Fig. 1d), not approximately half. It also describes localization in other settings without establishing a proportion for all micronuclei. (LLM, conf=0.88)

    Experimental — accuracy not yet measured
  • Type I IFN is produced by cancer cells undergoing ICD via TLR3 detection of endogenous dsRNA or cGAS detection of dsDNA.

    “Type I IFN is produced by cancer cells succumbing to ICD by a mechanism involving the detection of endogenous dsRNA by TLR3 [873], or double-stranded DNA (dsDNA) by cGAS [854, 905, 906].”
  • Cancer cells escaping mitotic catastrophe promote type I IFN secretion after cGAS detection of cytosolic dsDNA, potentially leading to immune elimination.

    “Moreover, recent data indicate that cancer cells escaping mitotic catastrophe efficiently promote the secretion of type I IFN following the detection of cytosolic dsDNA by cGAS, potentially resulting in their elimination by immunological mechanisms [905, 906].”
  • Such inhibition could also weaken immune surveillance and tumor suppression that begin with MN.

    “this strategy may also impair signaling of MN-initiated cell-intrinsic immune surveillance and tumor suppression (Harding et al., 2017; Mackenzie et al., 2017)”

    From Cytoplasmic DNA: sources, sensing, and role in aging and disease (2021) · cites this paper as Mackenzie et al., 2017

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Authors
Mackenzie, K. J., Carroll, P., Martin, C.-A., Murina, O., Fluteau, A., Simpson, D. J., Olova, N., Sutcliffe, H., Rainger, J. K., Leitch, A., Osborn, R. T., Wheeler, A. P., Nowotny, M., Gilbert, N., Chandra, T., Reijns, M. A. M., & Jackson, A. P.
Affiliations
  • Institute of Genetics and Cancer (GB)
  • International Institute of Molecular and Cell Biology (PL)
Corresponding author
  • Reijns, Martin A. M.
  • Jackson, Andrew P.
Venue
Nature
Published
2017-07-24
Volume
548
Issue
7668
Pages
461-465
ISSN
  • 0028-0836 (ISSN-L)
  • 1476-4687
OpenAlex
W2738136165
Cited by
1,752
References
56
Citations by year
2026: 208 · 2025: 196 · 2024: 225 · 2023: 233 · 2022: 216 · 2021: 231 · 2020: 193 · 2019: 125 · 2018: 99 · 2017: 26
FWCI
54.28
Type
journal article
Language
en
Open access
Locations
  • Nature (publishedVersion)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (acceptedVersion)
  • RePEc: Research Papers in Economics (submittedVersion)
  • Edinburgh Research Explorer (University of Edinburgh) (submittedVersion, other-oa)
Funders
  • Howard Hughes Medical Institute
  • Wellcome Trust
  • Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung (158709)
  • Medical Research Council (1805075, MR/K01563X/1, MC_PC_15075)
Topics
  • Life Sciences › Immunology and Microbiology › Immunology › interferon and immune responses
  • Life Sciences › Immunology and Microbiology › Immunology › Immune Response and Inflammation
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › DNA Repair Mechanisms
Keywords
cGAS, micronuclei, genomic instability, innate immunity, cytosolic DNA sensing, autoinflammation, chromothripsis, DNA damage, interferon-stimulated genes, cancer, mitosis, lagging chromosomes, immunostimulatory DNA
MeSH terms
Chromothripsis, Cyclic Guanosine Monophosphate-Adenosine Monophosphate Synthase, Animals, Cell Cycle, Chromatin, Cytoplasm, DNA, DNA Damage, Female, Humans, Immunity, Innate, Inflammation, Lasers, Male, Mitosis, Nuclear Envelope, Nucleotidyltransferases, Microdissection, Genomic Instability, Cell Line, Tumor, Micronuclei, Chromosome-Defective, Mice, Single-Cell Analysis, Transcriptome

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