The EIF2A Knockout HEK293T Polyclonal Cells are a CRISPR/Cas9-engineered polyclonal knockout population of HEK293T cells with targeted disruption of the EIF2A gene. EIF2A encodes the ?? subunit of eukaryotic initiation factor 2 (eIF2??), a central regulator of translation initiation. This loss-of-function model enables investigation of the integrated stress response (ISR) and translational control without clonal selection artifacts, providing a robust tool for diverse experimental workflows.
HEK293T cells are an epithelial line derived from human embryonic kidney 293 cells, transformed with adenovirus 5 DNA and expressing the SV40 large T-antigen. Renowned for high transfectability, efficient recombinant protein production, and permissiveness to many viruses, HEK293T is a workhorse in molecular and cellular biology. Its well-characterized translational machinery makes it an ideal host for studying the mechanisms of protein synthesis regulation.
eIF2?? is essential for delivering initiator methionyl-tRNA to the 40S ribosomal subunit as part of the eIF2-GTP-Met-tRNAi ternary complex. Under stress??including amino acid deprivation, ER stress, heme deficiency, and viral double-stranded RNA??kinases EIF2AK1 (HRI), EIF2AK2 (PKR), EIF2AK3 (PERK), and EIF2AK4 (GCN2) phosphorylate eIF2?? at Ser51. This modification inhibits the guanine nucleotide exchange factor eIF2B, attenuating global translation while selectively promoting expression of stress-responsive genes such as ATF4, CHOP (DDIT3), and GADD34 (PPP1R15A). eIF2?? thus orchestrates a switch from housekeeping protein synthesis to adaptive gene expression.
Ablation of EIF2A in HEK293T cells eliminates this critical regulatory node, allowing direct assessment of eIF2??-dependent and -independent pathways. The knockout pool is especially valuable for studying viral subversion of host translation, as many viruses target the eIF2?? pathway to suppress innate immunity. Moreover, it facilitates discrimination between signaling downstream of the four eIF2?? kinases and enables characterization of stress granule dynamics, a process intimately linked to eIF2?? function.
These polyclonal knockout cells are suited for techniques including Western blotting for phospho-eIF2?? and ATF4, RT-qPCR for CHOP and GADD34, dual-luciferase uORF reporter assays, polysome profiling, and immunofluorescence microscopy of stress granules. Research applications encompass screening for ISR modulators, investigating translation mechanisms in cancer and neurodegeneration, studying viral replication, and analyzing metabolic and anemia-related pathways. For further details, contact Ascent Research.
