The EIF2AK1 Knockout Raji Polyclonal Cells are a CRISPR/Cas9-edited polyclonal knockout population of Raji B-lymphoblastoid cells with disrupted EIF2AK1 (HRI) expression. This mixed knockout pool offers a convenient loss-of-function model for studying EIF2AK1 function without requiring clonal isolation. The polyclonal format preserves population-level heterogeneity while enabling robust target gene disruption, suitable for bulk functional assays in B-cell malignancy research.
Raji cells, an EBV-positive Burkitt??s lymphoma-derived B-lymphoblastoid line with mutant p53, are widely used to model B-cell lymphomagenesis and viral oncogenesis. Their high proliferation rates and altered apoptotic signaling make them a valuable host for investigating stress-responsive pathways that intersect with lymphomagenesis.
EIF2AK1 encodes the heme-regulated inhibitor kinase (HRI), a stress-activated serine/threonine kinase that phosphorylates EIF2S1 (eIF2??) in response to heme deficiency, oxidative stress, heat shock, and nitric oxide. This phosphorylation inhibits global translation while promoting ATF4 translation, which induces stress-responsive genes such as DDIT3, ATF3, and PPP1R15A. EIF2AK1 activity is suppressed by heme binding and modulated by interactions with Hsp90 and hemoproteins like cytochrome P450; downstream, it converges on the EIF2B complex to control translation initiation.
In the Raji lymphoma model, EIF2AK1-dependent stress signaling contributes to adaptive survival, proliferation, and drug sensitivity. The EBV-positive, p53-deficient background may heighten reliance on the integrated stress response, making EIF2AK1 a critical node for studying how malignant B cells manage proteotoxic and metabolic stress. Disruption of EIF2AK1 in this polyclonal population allows interrogation of ATF4/DDIT3-mediated transcriptional programs and their roles in apoptosis and therapeutic resistance.
Key applications include assessing the role of EIF2AK1 in B-cell lymphoma survival under pharmacological stress, translational profiling via RNA-seq, and drug sensitivity screening. Typical assays include Western blotting for phospho-eIF2?? and ATF4, RT-qPCR for ATF4 and DDIT3, flow cytometry for apoptosis (Annexin V), and cell viability assays (MTT/XTT). Metabolic analysis with Seahorse and co-immunoprecipitation of eIF2 complex components further support mechanistic studies. These polyclonal knockout cells provide a versatile tool for dissecting the eIF2?? kinase arm of the integrated stress response. For additional information, please contact Ascent Research.
