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Interferon lambda 4 expression is suppressed by the host during viral infection.

MeeAe Hong1, Johannes Schwerk1, Chrissie Lim1

  • 1Department of Immunology, University of Washington, Seattle, WA 98109.

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Summary

Humans suppress the expression of interferon lambda 4 (IFNλ4), a recently discovered antiviral protein. This suppression occurs through multiple mechanisms, limiting functional IFNλ4 and suggesting reliance on other interferon lambda family members for immune responses.

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Area of Science:

  • Immunology
  • Virology
  • Molecular Biology

Background:

  • Interferon (IFN) lambdas are key antiviral proteins, particularly in liver and mucosal infections.
  • While IFNλ1, IFNλ2, and IFNλ3 possess antiviral properties, the recently identified IFNL4 gene's role in hepatitis C virus (HCV) infection is detrimental, though the mechanism remains unclear.
  • A notable feature of human IFNL4 is a genetic variant causing a premature stop codon.

Purpose of the Study:

  • To conduct a molecular and biochemical characterization of IFNλ4.
  • To elucidate the role and regulatory mechanisms of IFNλ4 expression.
  • To understand why IFNL4 expression is detrimental to HCV infection.

Main Methods:

  • Molecular and biochemical characterization of IFNλ4.
  • Analysis of splice variants and protein isoforms.
  • Investigation of mRNA translation efficiency, including polyribosome loading and polyadenylation signals.

Main Results:

  • IFNλ4 demonstrates antiviral activity comparable to IFNλ3 without adverse effects on other antiviral IFN activities or cell viability.
  • Humans employ multiple strategies to restrict functional IFNλ4 expression, utilizing noncoding splice variants and nonfunctional protein isoforms.
  • Protein-coding IFNL4 mRNA exhibits poor translation efficiency due to lack of polyribosome loading and a weak polyadenylation signal.

Conclusions:

  • Human cells actively suppress the expression of functional IFNλ4.
  • The observed suppression mechanisms suggest that the immune system relies on other interferon lambda family members for effective antiviral defense.
  • Understanding IFNλ4 regulation provides insight into host-virus interactions and immune evasion strategies.