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Interferons (IFNs, / ˌ ɪ n t ər ˈ f ɪər ɒ n / IN-tər-FEER-on [1]) are a group of signaling proteins [2] made and released by host cells in response to the presence of several viruses. In a typical scenario, a virus-infected cell will release interferons causing nearby cells to heighten their anti-viral defenses.
The type-I interferons (IFN) are cytokines which play essential roles in inflammation, immunoregulation, tumor cells recognition, and T-cell responses. In the human genome, a cluster of thirteen functional IFN genes is located at the 9p21.3 cytoband over approximately 400 kb including coding genes for IFNα (IFNA1, IFNA2, IFNA4, IFNA5, IFNA6, IFNA7, IFNA8, IFNA10, IFNA13, IFNA14, IFNA16 ...
Interferon-alpha, an interferon type I, was identified in 1957 as a protein that interfered with viral replication. [5] The activity of interferon-gamma (the sole member of the interferon type II class) was described in 1965; this was the first identified lymphocyte-derived mediator. [6]
Interferon gamma (IFNG or IFN-γ) is a dimerized soluble cytokine that is the only member of the type II class of interferons. [5] The existence of this interferon, which early in its history was known as immune interferon, was described by E. F. Wheelock as a product of human leukocytes stimulated with phytohemagglutinin, and by others as a product of antigen-stimulated lymphocytes. [6]
Viral interference is considered the most common outcome of coinfection, or the simultaneous infection of a host by two or more distinct viruses. [5] The primary form of viral interference is known as superinfection exclusion, in which the initial infection stimulates a resistance to subsequent infection by related viruses.
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3440 15965 Ensembl ENSG00000188379 ENSMUSG00000078354 UniProt P01563 P01573 RefSeq (mRNA) NM_000605 NM_010503 RefSeq (protein) NP_000596 NP_034633 Location (UCSC) Chr 9: 21.38 – 21.39 Mb Chr 4: 88.6 – 88.6 Mb PubMed search Wikidata View/Edit Human View/Edit Mouse Interferon alpha-2 is a protein that in humans is encoded by the IFNA2 gene. Protein family Human interferon alpha-2 (IFNα2) is ...