The EIF2A Knockout Raji Polyclonal Cells constitute a CRISPR/Cas9-edited polyclonal knockout cell population derived from the Raji human B lymphocyte cell line, with disruption of the EIF2A gene. This polyclonal format provides a heterogeneous pool of edited cells, enabling population-level loss-of-function studies while minimizing clonal artifacts. It serves as a versatile model for investigating the role of EIF2A in stress-responsive translation within a B-cell context.
Raji cells are an EBV-positive Burkitt’s lymphoma-derived B lymphocyte line that retains key immune functions such as antibody production and antigen presentation. This suspension cell line is widely used to study adaptive immunity, lymphomagenesis, and stress signaling. The EBV-positive background also allows exploration of viral interactions with host translational control mechanisms.
EIF2A functions as an alternative translation initiation factor that recruits Met-tRNAi to the 40S ribosomal subunit in a GTP-dependent manner, primarily under conditions that inhibit canonical eIF2 via phosphorylation of eIF2??. Upstream stress sensors, including PERK, GCN2, HRI, and PKR, activate this pathway in response to ER stress, amino acid scarcity, heme deficiency, and viral insults. EIF2A interacts with eIF5B to facilitate 40S loading onto IRES-containing mRNAs, driving synthesis of stress-responsive proteins. This non-canonical initiation integrates with the integrated stress response and intersects with mTOR signaling, thereby modulating translational reprogramming during cellular adaptation.
In Raji B cells, EIF2A knockout disables a critical stress-resilient translation mechanism, potentially sensitizing cells to stresses that induce eIF2?? phosphorylation. Given the high protein synthesis demands for immunoglobulin production and the oncogenic context of Burkitt’s lymphoma, this model illuminates how loss of alternative initiation impacts cell survival, stress adaptation, and malignant phenotypes. It also permits dissection of translational control in EBV-driven lymphomagenesis.
Typical applications include polysome profiling to evaluate global translation, puromycin incorporation for protein synthesis rates, and dual-luciferase reporters to quantify IRES-mediated initiation. Western blotting of phospho-eIF2?? monitors canonical stress pathway activation, while flow cytometry assays detect apoptosis under stress conditions. Ribosome footprinting can map translatome changes. These approaches support drug screening for translation-targeting therapies and mechanistic studies of non-canonical initiation in B-cell lymphoma. For inquiries, please contact Ascent Research.
