Innate immune DNA-sensing receptor

Innate immune DNA-sensing receptors are a diverse group of pattern recognition receptors (PRRs) that detect double-stranded DNA (dsDNA) in the cytosol or endosomes, where it is typically absent under healthy conditions (NIH, Frontiers in Immunology). This sensing mechanism is a critical component of the host defense system, allowing for the detection of DNA-containing pathogens like viruses and bacteria, as well as damaged self-DNA released during cell stress or death (Frontiers in Immunology, ScienceDaily). Key members of this group include the cytosolic sensor cyclic GMP-AMP synthase (cGAS), the endosomal Toll-like receptor 9 (TLR9), and the inflammasome-forming sensor absent in melanoma 2 (AIM2) (NIH). Upon activation, these receptors trigger signaling cascades—most notably the cGAS-STING pathway—that lead to the production of type I interferons and pro-inflammatory cytokines (ScienceDaily, NIH). Dysregulation of these pathways is linked to various pathologies, including autoimmune diseases like systemic lupus erythematosus and certain cancers (NIH, Frontiers in Immunology). Consequently, these receptors are major therapeutic targets; agonists are being developed for cancer immunotherapy to stimulate anti-tumor immunity, while antagonists and inhibitors are being investigated for treating chronic inflammatory and autoimmune conditions (NIH, Frontiers in Immunology).

Other names

Innate immune DNA-sensing receptorsDNA sensorsCytosolic DNA sensorsEndosomal DNA sensorsNucleic acid sensorsDNA-sensing pattern recognition receptors

Agonism of DNA sensors (e.g., TLR9) to stimulate anti-tumor immunity and antiviral responses; antagonism or inhibition (e.g., cGAS inhibitors) to suppress pathological inflammation and autoimmunity (NIH, Frontiers in Immunology).