The IRF5 Knockout HAP1 Polyclonal Cells are a CRISPR/Cas9-edited polyclonal knockout cell population designed to disrupt the IRF5 gene in the near-haploid HAP1 cell line. This loss-of-function model is generated by CRISPR/Cas9-mediated targeted disruption of IRF5, resulting in a heterogeneous pool of edited cells with abrogated IRF5 expression. The polyclonal nature preserves the diversity of editing events while providing a reliable tool for studying IRF5-dependent cellular processes.
The HAP1 cell line is a near-haploid chronic myeloid leukemia cell line originally derived from KBM-7. Its near-haploid karyotype, with a single copy of most chromosomes, significantly simplifies genetic manipulation and functional genomics studies. This unique ploidy reduces the complexity associated with heterozygous mutations and facilitates unambiguous genotype-phenotype correlations, making HAP1 cells a preferred host for high-throughput screening, drug discovery, and targeted gene knockout experiments.
IRF5 is a pivotal transcription factor in the innate immune system, operating downstream of pattern recognition receptors such as Toll-like receptors (TLRs) and RIG-I-like receptors (RLRs). Upon activation, upstream kinases TBK1 and IKK?? phosphorylate IRF5, triggering its nuclear translocation and assembly with co-activators like CBP/p300. Within the nucleus, IRF5 cooperates with IRF3, IRF7, and NF-??B to drive the transcription of type I interferons (IFN??, IFN??) and pro-inflammatory cytokines (TNF??, IL-6, IL-12), as well as interferon-stimulated genes (ISG15, OAS1, CXCL10). Key upstream signaling adaptors include MyD88, IRAK1/4, TRAF6, and TAK1, which link receptor activation to IRF5 phosphorylation.
In the HAP1 cellular context, disruption of IRF5 provides a powerful model to dissect its specific contribution to innate immune signaling without the confounding effects of variable gene copy number. The polyclonal knockout population allows researchers to assess the overall functional impact of IRF5 loss while mitigating clonal artifacts. Given the near-haploid background, the IRF5 knockout more directly reveals downstream effects, facilitating clearer elucidation of pathway crosstalk, feedback regulation, and effector functions in a simplified genetic environment.
This product is ideally suited for a broad range of investigations, including the study of TLR and RLR signal transduction, regulation of pro-inflammatory cytokine production, and the molecular mechanisms underlying autoimmune diseases such as systemic lupus erythematosus, rheumatoid arthritis, and inflammatory bowel disease. Typical assays include western blotting for IRF5 and phospho-IRF5, RT-qPCR analysis of IFN??/?? and cytokine mRNAs, immunofluorescence to monitor IRF5 nuclear translocation, and flow cytometry for intracellular cytokine staining. Additional techniques such as dual-luciferase reporter assays for the IFN?? promoter, co-immunoprecipitation of IRF5 interactors, ELISA for secreted cytokines, and ChIP-qPCR for target promoter binding further extend the utility. For more information, please contact Ascent Research.
