The EIF2AK4 Knockout Raji Polyclonal Cells represent a CRISPR/Cas9-edited polyclonal knockout cell population derived from the human Raji B-lymphocyte line. In this product, the gene encoding EIF2AK4 (also known as GCN2) has been disrupted via CRISPR/Cas9-mediated gene targeting, yielding a heterogeneous mixture of cells with loss-of-function mutations in EIF2AK4. This polyclonal format provides a robust model for studying the integrated stress response without the clonal bias inherent in single-cell-derived lines.
The Raji host cell line is an Epstein-Barr virus (EBV)-positive B lymphoblast line originally established from a Burkitt’s lymphoma patient. Raji cells retain many characteristics of malignant B cells and have been widely employed as a model for B-cell lymphoma research, including studies of EBV-driven oncogenesis, B-cell receptor signaling, and apoptosis regulation. Their robust growth in suspension culture and well-characterized signaling networks make them a versatile platform for CRISPR-based functional genomics.
EIF2AK4 encodes the serine/threonine kinase GCN2, a key sensor of amino acid deprivation. Under nutrient stress, uncharged tRNAs accumulate and bind to the histidyl-tRNA synthetase-like domain of GCN2, activating the kinase. GCN2 then phosphorylates the alpha subunit of eukaryotic initiation factor 2 (eIF2??) at Ser51, leading to global translational attenuation while selectively enhancing the translation of ATF4. The resulting ATF4-dependent transcriptional program upregulates targets such as CHOP (DDIT3), GADD34, and amino acid biosynthesis enzymes, as well as autophagy-related genes, to restore amino acid homeostasis. GCN2 activity is further modulated by interacting partners including GCN1, IMPACT, and TRB3, and signals through the integrated stress response (ISR) pathway, which intersects with mTORC1/S6K signaling.
In the context of Raji B-cell lymphoma, EIF2AK4 knockout provides a powerful tool to dissect how the ISR contributes to lymphomagenesis and treatment resistance. Burkitt’s lymphoma cells often face metabolic stress due to rapid proliferation, and GCN2-mediated stress adaptation may support their survival under nutrient-poor conditions within the tumor microenvironment. Furthermore, EBV infection can manipulate host stress pathways, making this model valuable for investigating virus?Chost interactions that alter amino acid sensing and translation control. Disruption of EIF2AK4 may sensitize cells to certain chemotherapies or targeted agents, offering insights into drug resistance mechanisms.
This polyclonal knockout product is suitable for a wide array of experimental applications. Researchers can employ Western blotting and phospho-signaling analysis to assess eIF2?? phosphorylation and ATF4 induction in response to amino acid starvation. RT-qPCR or RNA-seq can profile transcriptional changes downstream of GCN2. Flow cytometry?Cbased assays can evaluate apoptosis, proliferation, or stress responses. Co-immunoprecipitation studies can probe interactions between GCN2 and its binding partners, while drug sensitivity assays can test the role of EIF2AK4 in chemotherapy efficacy. Overall, these cells enable detailed mechanistic studies of metabolic adaptation and stress signaling in B-cell lymphoma. For additional information, please contact Ascent Research.
