The EIF2A Knockout K-562 Polyclonal Cells product provides a CRISPR/Cas9-edited polyclonal knockout cell population generated from the K-562 host cell line by disruption of the EIF2A gene. This gene encodes the alpha subunit of eukaryotic initiation factor 2 (eIF2??), a central regulator of protein synthesis and the integrated stress response (ISR). The polyclonal population offers a heterogeneous pool of loss-of-function alleles, enabling robust functional genomics studies without clonal bias. It is designed for researchers requiring a versatile knockout model in a well-characterized hematopoietic cell background.
K-562 cells are a human chronic myeloid leukemia (CML) lymphoblast line established from a patient in blast crisis. They harbor the Philadelphia chromosome, producing the BCR-ABL1 fusion oncoprotein with constitutive tyrosine kinase activity. K-562 cells exhibit an undifferentiated blast phenotype and serve as a widely used model for studying CML biology, apoptosis, differentiation, and drug resistance. Their rapid growth and suspension culture facilitate high-throughput screening and biochemical assays, making them an ideal host for gene-edited models.
EIF2A encodes the regulatory ?? subunit of the eIF2 heterotrimeric complex, which delivers initiator methionyl-tRNA to the ribosome. Under diverse stresses??such as ER stress, amino acid deprivation, or viral infection??upstream kinases including EIF2AK3 (PERK), EIF2AK2 (PKR), EIF2AK1 (HRI), and EIF2AK4 (GCN2) phosphorylate eIF2?? at serine 51. This phosphorylation inhibits the guanine nucleotide exchange factor eIF2B, reducing global translation initiation while paradoxically enhancing translation of ATF4. ATF4 then transcriptionally activates downstream effectors like CHOP (DDIT3), GADD34 (PPP1R15A), and BiP (HSPA5), which mediate adaptive recovery or apoptosis. eIF2?? also interacts with eIF2??, eIF2??, GCN1, and ribosomal subunits, positioning it as a critical node within the ISR, unfolded protein response (UPR), and mTOR signaling networks.
In the BCR-ABL1-driven K-562 leukemia model, the ISR is often rewired to support survival and drug resistance. Disruption of EIF2A abrogates eIF2?? function, uncoupling the stress-kinase sensing from downstream ATF4-mediated transcription. This knockout model enables dissection of how chronic myeloid leukemia cells depend on translational reprogramming for proliferation and evasion of apoptosis under stress conditions, such as ER stress induced by chemotherapeutics. It provides a powerful tool for investigating the therapeutic potential of targeting the ISR in hematological malignancies.
Researchers can employ this polyclonal knockout population in a range of experimental workflows, including western blotting for phospho-eIF2?? and total eIF2??, RT-qPCR quantitation of ATF4 and CHOP mRNA, ATF4-luciferase reporter assays, polysome profiling to assess translation status, and cell viability or apoptosis assays following treatment with ER stress inducers like tunicamycin or thapsigargin. The model is well-suited for functional genomics screens, drug sensitivity/resistance profiling, and investigation of translational control mechanisms in cancer. For detailed technical specifications, validation data, and ordering information, please contact Ascent Research.
