Cited by 253HIV Research and TreatmentT-cell and Retrovirus StudiesHIV/AIDS drug development and treatment

Defective HIV-1 proviruses produce viral proteins

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Imamichi, Hiromi, Smith, Mindy, Adelsberger, Joseph W., Izumi, Taisuke, Scrimieri, Francesca, Sherman, Brad T., Rehm, Catherine A., Imamichi, Tomozumi +4 more·2020·Proceedings of the National Academy of Sciences

Abstract

HIV-1 proviruses persist in the CD4 + T cells of HIV-infected individuals despite years of combination antiretroviral therapy (cART) with suppression of HIV-1 RNA levels <40 copies/mL. Greater than 95% of these proviruses detected in circulating peripheral blood mononuclear cells (PBMCs) are referred to as “defective” by virtue of having large internal deletions and lethal genetic mutations. As these defective proviruses are unable to encode intact and replication-competent viruses, they have long been thought of as biologically irrelevant “graveyard” of viruses with little significance to HIV-1 pathogenesis. Contrary to this notion, we have recently demonstrated that these defective proviruses are not silent, are capable of transcribing novel unspliced forms of HIV-RNA transcripts with competent open reading frames (ORFs), and can be found in the peripheral blood CD4 + T cells of patients at all stages of HIV-1 infection. In the present study, by an approach of combining serial dilutions of CD4 + T cells and T cell–cloning technologies, we are able to demonstrate that defective proviruses that persist in HIV-infected individuals during suppressive cART are translationally competent and produce the HIV-1 Gag and Nef proteins. The HIV-RNA transcripts expressed from these defective proviruses may trigger an element of innate immunity. Likewise, the viral proteins coded in the defective proviruses may form extracellular virus-like particles and may trigger immune responses. The persistent production of HIV-1 proteins in the absence of viral replication helps explain persistent immune activation despite HIV-1 levels below detection, and also presents new challenges to HIV-1 eradication.

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Crossref · 10.1073/pnas.1917876117

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  • A multitude of studies showed that defective HIV-1 genomes inside cells may still produce individual viral transcripts or proteins, which could be mistaken as indicators of a functional reservoir of infectious virus.

    “Conversely, a multitude of studies showed that defective HIV-1 genomes inside cells may still produce individual viral transcripts or proteins, 33-35,55 which could be mistaken as indicators of a functional reservoir of infectious virus.”

    From Revealing viral and cellular dynamics of HIV-1 at the single-cell level during early treatment periods (2023) · cites this paper as [35]

    The Abstract and Discussion report that defective, replication-incompetent HIV-1 proviruses can produce viral transcripts and proteins. Our copy does not address whether those products have been, or could be, mistaken for indicators of an infectious viral reservoir; that part of the claim is an inference rather than a point the paper makes. (LLM, conf=0.83)

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Authors
Imamichi, H., Smith, M., Adelsberger, J. W., Izumi, T., Scrimieri, F., Sherman, B. T., Rehm, C. A., Imamichi, T., Pau, A., Catalfamo, M., Fauci, A. S., & Lane, H. C.
Affiliations
  • National Institutes of Health (US)
  • Frederick National Laboratory for Cancer Research (US)
  • Department of Microbiology and Immunology, Georgetown University School of Medicine, Washington, DC 20057
Corresponding author
  • Fauci, Anthony S.
  • Lane, H. Clifford
Venue
Proceedings of the National Academy of Sciences
Published
2020-02-06
Volume
117
Issue
7
Pages
3704-3710
ISSN
  • 0027-8424 (ISSN-L)
  • 1091-6490
OpenAlex
W3005267901
Cited by
251
References
46
Citations by year
2026: 38 · 2025: 41 · 2024: 40 · 2023: 41 · 2022: 33 · 2021: 38 · 2020: 19
FWCI
17.40
Type
journal article
Language
en
Open access
Locations
  • Proceedings of the National Academy of Sciences (publishedVersion, cc-by-nc-nd)
  • PubMed Central (publishedVersion, cc-by-nc-nd)
  • PubMed (publishedVersion)
Funders
Division of Intramural Research, National Institute of Allergy and Infectious Diseases (N/A)
Topics
  • Life Sciences › Immunology and Microbiology › Virology › HIV Research and Treatment
  • Life Sciences › Immunology and Microbiology › Immunology › T-cell and Retrovirus Studies
  • Health Sciences › Medicine › Infectious Diseases › HIV/AIDS drug development and treatment
Keywords
HIV-1 Gag protein, HIV-1 Nef, CD4+ T cells, highly active antiretroviral therapy, viral persistence, open reading frames, virus-like particles, innate immunity, persistent immune activation, HIV-1 eradication
MeSH terms
Humans, Leukocytes, Mononuclear, Male, Middle Aged, Proviruses, Viral Proteins, CD4-Positive T-Lymphocytes, HIV-1, HIV Infections

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