title: Interferon lambda 4 signals via the IFNλ receptor to regulate antiviral activity against HCV and coronaviruses.
abstract: The IFNL4 gene is a recently discovered type III interferon, which in a significant fraction of the human population harbours a frameshift mutation abolishing the IFNλ4 ORF. The expression of IFNλ4 is correlated with both poor spontaneous clearance of hepatitis C virus (HCV) and poor response to treatment with type I interferon. Here, we show that the IFNL4 gene encodes an active type III interferon, named IFNλ4, which signals through the IFNλR1 and IL-10R2 receptor chains. Recombinant IFNλ4 is antiviral against both HCV and coronaviruses at levels comparable to IFNλ3. However, the secretion of IFNλ4 is impaired compared to that of IFNλ3, and this impairment is not due to a weak signal peptide, which was previously believed. We found that IFNλ4 gets N-linked glycosylated and that this glycosylation is required for secretion. Nevertheless, this glycosylation is not required for activity. Together, these findings result in the paradox that IFNλ4 is strongly antiviral but a disadvantage during HCV infection.
authors.affiliation: Department of Molecular Biology and Genetics, Aarhus University, Aarhus, Denmark.
authors.forename: Ole J
authors.initials: OJ
authors.lastname: Hamming
authors.forename: Ewa
authors.initials: E
authors.lastname: Terczyńska-Dyla
authors.forename: Gabrielle
authors.initials: G
authors.lastname: Vieyres
authors.forename: Ronald
authors.initials: R
authors.lastname: Dijkman
authors.forename: Sanne E
authors.initials: SE
authors.lastname: Jørgensen
authors.forename: Hashaam
authors.initials: H
authors.lastname: Akhtar
authors.forename: Piotr
authors.initials: P
authors.lastname: Siupka
authors.forename: Thomas
authors.initials: T
authors.lastname: Pietschmann
authors.forename: Volker
authors.initials: V
authors.lastname: Thiel
authors.forename: Rune
authors.initials: R
authors.lastname: Hartmann
mesh_terms: D000595:Amino Acid Sequence; D000998:Antiviral Agents / Q000494:pharmacology*; D015153:Blotting, Western; D049109:Cell Proliferation; D002478:Cells, Cultured; D003332:Coronaviridae / Q000472:pathogenicity; D003333:Coronaviridae Infections / Q000378:metabolism / Q000517:prevention & control* / Q000821:virology; D006031:Glycosylation; D016174:Hepacivirus / Q000472:pathogenicity; D006526:Hepatitis C / Q000378:metabolism / Q000517:prevention & control* / Q000821:virology; D006801:Humans; D007124:Immunoenzyme Techniques; D007371:Interferon-gamma / Q000378:metabolism; D007378:Interleukins / Q000737:chemistry / Q000235:genetics / Q000378:metabolism*; D008969:Molecular Sequence Data; D011487:Protein Conformation; D021382:Protein Sorting Signals / Q000502:physiology; D012333:RNA, Messenger / Q000235:genetics; D060888:Real-Time Polymerase Chain Reaction; D017471:Receptors, Interferon / Q000235:genetics / Q000378:metabolism*; D018123:Receptors, Interleukin / Q000235:genetics / Q000378:metabolism*; D012137:Respiratory System / Q000166:cytology / Q000378:metabolism; D020133:Reverse Transcriptase Polymerase Chain Reaction; D017386:Sequence Homology, Amino Acid; D014779:Virus Replication; D000096743:Interferon gamma Receptor; D000095022:Interferon Lambda
chemical_list: D000998:Antiviral Agents; D007371:Interferon-gamma; D007378:Interleukins; D021382:Protein Sorting Signals; D012333:RNA, Messenger; D017471:Receptors, Interferon; D018123:Receptors, Interleukin; D000096743:Interferon gamma Receptor; C579163:IFNL4 protein, human; D000095022:Interferon Lambda