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Related Concept Videos

Immune Response Against Viral Pathogens01:29

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The immune system's response to viral infections is a complex and coordinated process involving natural killer (NK) cells, T cell-mediated responses, and antibody-mediated responses.
NK Cells
NK cells are a crucial part of our innate immune system, acting as the first line of defense against viral infections. These cells can recognize and kill infected cells without prior exposure to the virus, effectively slowing down the spread of infection. Additionally, NK cells produce proinflammatory...
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Robust Virus-Specific Adaptive Immunity in COVID-19 Patients with SARS-CoV-2 Δ382 Variant Infection.

Siew-Wai Fong1, Nicholas Kim-Wah Yeo1, Yi-Hao Chan1

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The SARS-CoV-2 ORF8 deletion (Δ382) variant enhances adaptive immunity, promoting robust T cell and antibody responses. This finding offers insights into host-pathogen interactions and potential therapeutic targets for COVID-19.

Keywords:
Adaptive immune responseAntibody responseCD4+ T cell responseCD8+ T cell responseCOVID-19ORF8SARS-CoV-2Transcriptome

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Area of Science:

  • Virology
  • Immunology
  • Genetics

Background:

  • Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) variants of concern (VOCs) often possess ORF8 mutations.
  • A specific 382-nucleotide deletion (Δ382) in ORF7b/ORF8 regions is linked to milder COVID-19 disease and reduced inflammation.
  • The precise impact of the Δ382 deletion on host immunity against SARS-CoV-2 remains unclear.

Purpose of the Study:

  • To investigate the host immune response differences between wildtype and Δ382 SARS-CoV-2 infections.
  • To elucidate the transcriptomic profiles associated with the Δ382 variant.
  • To identify potential therapeutic targets related to ORF8-host interactions.

Main Methods:

  • Whole blood RNA-sequencing was employed to analyze transcriptomic profiles.
  • Immune signatures were compared between patients infected with wildtype and Δ382 SARS-CoV-2.
  • Gene expression patterns were correlated with cytokine levels.

Main Results:

  • Patients with Δ382 SARS-CoV-2 exhibited an enhanced adaptive immune response.
  • Increased T cell functionality and SARS-CoV-2-specific T cell immunity were observed.
  • A more rapid antibody response and upregulated eukaryotic initiation factor 2 signaling were noted in Δ382 infections.
  • Genes associated with eukaryotic initiation factor 2 signaling correlated with T cell and pro-inflammatory cytokines.

Conclusions:

  • The Δ382 deletion in SARS-CoV-2 ORF8 is associated with a heightened adaptive immune response.
  • ORF8 interactions play a significant role in modulating host immunity during SARS-CoV-2 infection.
  • Targeting ORF8 interactions presents a promising therapeutic strategy against SARS-CoV-2.