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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.
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High-affinity CD16A polymorphism associated with reduced risk ofsevere COVID-19.

Anita E Qualls1, Tasha Tsao1, Irene Lui2

  • 1Department of Microbiology and Immunology, UCSF, San Francisco, California, USA.

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The high-affinity CD16AV176 gene variant enhances natural killer cell responses against SARS-CoV-2, reducing severe COVID-19. This genetic factor lowers the risk of intensive care unit admission and mechanical ventilation in patients.

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COVID-19Cellular immune responseImmunologyInnate immunityNK cells

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Area of Science:

  • Immunology
  • Genetics
  • Virology

Background:

  • Natural killer (NK) cells and CD16A receptors are crucial for antiviral immunity via antibody-dependent cellular cytotoxicity (ADCC).
  • The specific role of NK cell-mediated ADCC in SARS-CoV-2 infection and its impact on COVID-19 severity remain incompletely understood.
  • The CD16A V176 polymorphism, a high-affinity variant, was hypothesized to influence COVID-19 outcomes.

Purpose of the Study:

  • To investigate the functional differences between CD16AV176 and CD16AF176 alleles in vitro.
  • To determine the clinical relevance of the CD16AV176 polymorphism in a large cohort of hospitalized COVID-19 patients.
  • To explore the association between CD16A genotypes and disease severity, viral load, and inflammatory profiles.

Main Methods:

  • An in vitro reporter system was used to compare the activation potency and sensitivity of CD16AV176 and CD16AF176 alleles.
  • Clinical data, including ICU admission and mechanical ventilation, were analyzed from 1,027 hospitalized COVID-19 patients in the IMPACC cohort.
  • Transcriptomic, proteomic, and viral load data were assessed in relation to CD16A genotypes.

Main Results:

  • The CD16AV176 allele demonstrated significantly higher potency and sensitivity as an activator compared to CD16AF176.
  • Patients with the CD16AV176 allele showed a reduced risk of ICU admission, mechanical ventilation, and severe COVID-19.
  • While lower anti-SARS-CoV-2 IgG titers correlated with CD16AV176, no differences in viral load were observed; however, homozygous CD16AV176 individuals exhibited lower inflammatory mediator levels.

Conclusions:

  • The high-affinity CD16AV176 polymorphism is associated with a protective effect against severe COVID-19.
  • Enhanced NK cell-mediated responses due to CD16AV176 may limit severe respiratory complications.
  • This genetic factor offers insights for developing host-directed therapeutic strategies for COVID-19.