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ISGs are genes whose expression can be stimulated by interferon, but may also be stimulated by other pathways. [1] Interferons are a type of protein called a cytokine, which is produced in response to infection. [9] When released, they signal to infected cells and other nearby cells that a pathogen is present. [9]
Interferome is an online bioinformatics database of interferon-regulated genes (IRGs). [1] These Interferon Regulated Genes are also known as Interferon Stimulated Genes (ISGs). The database contains information on type I (IFN alpha, beta), type II (IFN gamma) and type III (IFN lambda) regulated genes and is regularly updated.
The gene encoding IFNα2, the IFNA2 gene, is clustered with all other type I IFN genes on chromosome 9 [8] and as all type I IFN genes, it is devoid of intron. [9] The open reading frame (coding sequence) of IFNA2 codes for a pre-protein of 188 amino acids with a 23 amino acid signal peptide allowing secretion of the mature protein. The mature ...
The type I IFNs bind type I IFN receptors on the surface of the cell that produced them, and also other cell types that express the receptor, to activate JAK-STAT (Janus kinase/signal transducers and activators of transcription) signaling. This leads to the induction of hundreds of interferon stimulated genes (ISGs) that amplify the IFN ...
This induces hundreds of interferon-stimulated genes to be expressed. This leads to antiviral protein production, such as protein kinase R, which inhibits viral protein synthesis, or the 2′,5′-oligoadenylate synthetase family, which degrades viral RNA. [27] Some viruses evade this by producing molecules that interfere with IFN production.
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]
Upon infection, STING from infected cells can sense the presence of nucleic acids from intracellular pathogens, and then induce interferon β and more than 10 forms of interferon α production. Type I interferon produced by infected cells can find and bind to Interferon-alpha/beta receptor of nearby cells to protect cells from local infection.
It took another fifteen to twenty years, using somatic cell genetics, to show that the interferon action gene and interferon gene reside in different human chromosomes. [71] [72] [73] The purification of human beta interferon did not occur until 1977. Y.H. Tan and his co-workers purified and produced biologically active, radio-labeled human ...