Protein-coding gene in the species Homo sapiens
Interferon lambda 4 (gene symbol: IFNL4) is one of the most recently discovered human genes and the newest addition to the interferon lambda protein family. This gene encodes the IFNL4 protein, which is involved in immune response to viral infection.
IFNL4 is similar to three neighboring genes (IFNL1, IFNL2 and IFNL3) in that proteins encoded by these genes bind to a shared co-receptor complex. Formation of this complex leads to activation of the JAK-STAT signalling pathway and upregulation of numerous interferon-stimulated genes. Genetics variants within or near this gene have been linked to clearance of hepatitis C virus (HCV) infection and other phenotypes.