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Possible Answers:
STING.
Last seen on: Washington Post Crossword Thursday, May 18, 2023
Random information on the term “STING”:
The cGAS–STING pathway is a component of the innate immune system that functions to detect the presence of cytosolic DNA and, in response, trigger expression of inflammatory genes that can lead to senescence or to the activation of defense mechanisms. DNA is normally found in the nucleus of the cell. Localization of DNA to the cytosol is associated with tumorigenesis, viral infection, and invasion by some intracellular bacteria. The cGAS – STING pathway acts to detect cytosolic DNA and induce an immune response.
Upon binding DNA, the protein cyclic GMP-AMP Synthase (cGAS) triggers reaction of GTP and ATP to form cyclic GMP-AMP (cGAMP). cGAMP binds to Stimulator of Interferon Genes (STING) which triggers phosphorylation of IRF3 via TBK1. IRF3 can then go to the nucleus to trigger transcription of inflammatory genes. This pathway plays a critical role in mediating immune defense against double-stranded DNA viruses.
The innate immune system relies on germline encoded pattern recognition receptors (PRRs) to recognize distinct pathogen-associated molecular patterns (PAMPs). Upon recognition of a PAMP, PRRs generate signal cascades leading to transcription of genes associated with the immune response. Because all pathogens utilize nucleic acid to propagate, DNA and RNA can be recognized by PRRs to trigger immune activation. In normal cells, DNA is confined to the nucleus or mitochondria. The presence of DNA in the cytosol is indicative of cellular damage or infection and leads to activation of genes associated with the immune response. One way cytosolic DNA is sensed is via the cGAS/STING pathway, specifically by the cyclic-GMP-AMP synthase (cGAS). Upon DNA recognition, cGAS dimerizes and stimulates the formation of cyclic-GMP-AMP (cGAMP). cGAMP then binds directly to stimulator of interferon genes (STING) which triggers phosphorylation/activation of the transcription factor IRF3 via TBK1. IRF3 is able to enter the nucleus to promote transcription of inflammatory genes, such as IFN-β.