The IRF3 Knockout A-549 Polyclonal Cells are a CRISPR/Cas9-edited polyclonal cell population designed for loss-of-function studies of IRF3. Using CRISPR/Cas9-mediated gene disruption, the IRF3 locus is targeted to ablate functional protein expression across a polyclonal pool, avoiding the need for single-cell cloning. This format provides a versatile resource for investigating innate immune signaling and antiviral responses.
The A-549 cell line originates from human lung adenocarcinoma and is characterized by an epithelial phenotype. These cells serve as a classical model of alveolar type II epithelium, widely used in cancer research and viral infection studies due to their susceptibility to respiratory pathogens. The A-549 background enables dissection of lung epithelial-intrinsic immune mechanisms within a malignant context.
IRF3 is a pivotal transcription factor in innate immunity, activated by TBK1 and IKK?? downstream of pattern recognition receptors such as RIG-I, MDA5, and cGAS-STING. Phosphorylated IRF3 dimerizes, enters the nucleus, and induces type I interferons (IFNA, IFNB) and interferon-stimulated genes (e.g., CXCL10, ISG15). It cooperates with IRF7, NF-??B, and CBP/p300 to orchestrate transcriptional responses from the RIG-I-like receptor, cGAS-STING, and Toll-like receptor pathways, serving as a master regulator of antiviral and inflammatory gene expression.
In A-549 lung epithelial cells, IRF3 knockout enables dissection of the interferon response axis central to antiviral defense and tumor immunobiology. This model is particularly suited to studying how malignant lung epithelial cells evade innate immunity, the role of IRF3 in cytokine storm pathogenesis, and the interplay between oncogenic signaling and interferon production. It offers a robust system for exploring the dual functions of IRF3 in cancer and infection.
The polyclonal knockout cells are amenable to diverse assays, including western blotting for IRF3 and its phosphorylated forms, RT-qPCR for IFNB and ISGs, luciferase reporter assays for promoter activity, immunofluorescence for nuclear translocation, and viral challenge experiments. Additional applications include co-culture with immune cells, drug screening for STING or TLR agonists, and transcriptomic profiling of IRF3-dependent gene networks. For inquiries, please contact Ascent Research.
