Cited by 100interferon and immune responsesImmune Response and InflammationDNA and Nucleic Acid Chemistry

Molecular and Structural Basis of DNA Sensors in Antiviral Innate Immunity

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Zahid, Ayesha, Ismail, Hazrat, Li, Bofeng, Jin, Tengchuan·2020·Frontiers in Immunology

Abstract

DNA viruses are a source of great morbidity and mortality throughout the world by causing many diseases; thus, we need substantial knowledge regarding viral pathogenesis and the host’s antiviral immune responses to devise better preventive and therapeutic strategies. The innate immune system utilizes numerous germ-line encoded receptors called pattern-recognition receptors (PRRs) to detect various pathogen-associated molecular patterns (PAMPs) such as viral nucleic acids, ultimately resulting in antiviral immune responses in the form of proinflammatory cytokines and type I interferons. The immune-stimulatory role of DNA is known for a long time; however, DNA sensing ability of the innate immune system was unraveled only recently. At present, multiple DNA sensors have been proposed, and most of them use STING as a key adaptor protein to exert antiviral immune responses. In this review, we aim to provide molecular and structural underpinnings on endosomal DNA sensor Toll-like receptor 9 (TLR9) and multiple cytosolic DNA sensors including cyclic GMP-AMP synthase (cGAS), interferon-gamma inducible 16 (IFI16), absent in melanoma 2 (AIM2), and DNA-dependent activator of IRFs (DAI) to provide new insights on their signaling mechanisms and physiological relevance. We have also addressed less well-understood DNA sensors such as DEAD-box helicase DDX41, RNA polymerase III (RNA pol III), DNA-dependent protein kinase (DNA-PK), and meiotic recombination 11 homolog A (MRE11). By comprehensive understanding of molecular and structural aspects of DNA-sensing antiviral innate immune signaling pathways, potential new targets for viral and autoimmune diseases can be identified.

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Crossref · 10.3389/fimmu.2020.613039

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  • Multiple DNA sensors have been described, including cGAS, AIM2, IFI16, and TLR9.

    “Multiple sensors have been described, depending on their subcellular localization, their specificity towards nucleic acids, as well as their associated adaptor protein, including cGAS, AIM2, IFI16, and TLR9 [78] (Figure 3).”
  • IFI16 is predominantly nuclear with smaller quantities in cytoplasm, recognizes dsDNA, is linked with STING adaptor, and is involved in inflammasome formation.

    “Interferon (IFN)-γ inducible protein 16 (IFI16) is another DNA sensor from the same family as AIM2, which can be found predominantly in the nucleus, with smaller quantities in the cytoplasm.Also capable of recognizing dsDNA, IFI16 is linked with STING adaptor and is involved in inflammasome formation [78,81].”
  • TLR9 is the only DNA sensor expressed in the endosome and the only one experimentally proven to trigger rAAV-associated immunity.

    “Finally, toll-like receptor (TLR)-9, member of the wellstudied TLR sub-family of PRRs, is the only DNA sensor expressed in the endosome and the only one, to date, experimentally proven to trigger rAAV-associated immunity.”

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Authors
Zahid, A., Ismail, H., Li, B., & Jin, T.
Affiliations
University of Science and Technology of China (CN)
Corresponding author
  • Li, Bofeng
  • Jin, Tengchuan
Venue
Frontiers in Immunology
Published
2020-11-30
Volume
11
Pages
613039-613039
ISSN
1664-3224 (ISSN-L)
OpenAlex
W3108522903
Cited by
100
References
171
Citations by year
2026: 10 · 2025: 24 · 2024: 15 · 2023: 25 · 2022: 15 · 2021: 11
FWCI
1.24
Type
journal article
Language
en
Open access
Locations
  • Frontiers in Immunology (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
Funders
  • National Natural Science Foundation of China (31971129, U1732109, 31870731)
  • Chinese Academy of Sciences (XDB29030104, 31971129, 31870731)
  • Chinese Government Scholarship
  • Fundamental Research Funds for the Central Universities
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 and Nucleic Acid Chemistry
Keywords
DNA sensing, antiviral innate immunity, pattern recognition receptors, TLR9, STING, cGAS, IFI16, AIM2, DAI, DDX41, RNA polymerase III, DNA-dependent protein kinase, MRE11, type I interferon, inflammatory cytokines, DNA viruses, viral pathogenesis, autoimmune disease
MeSH terms
Animals, Antiviral Agents, DNA Viruses, DNA, Viral, Humans, Immunity, Innate, Signal Transduction, Toll-Like Receptor 9

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