The EIF2AK4 Knockout HeLa Polyclonal Cells are a CRISPR/Cas9-edited polyclonal knockout cell population designed for loss-of-function studies of the EIF2AK4 gene in a human cervical epithelial context. This product provides a heterogeneous pool of HeLa cells carrying targeted disruption of the EIF2AK4 locus, enabling researchers to investigate the functional consequences of EIF2AK4 ablation in a polyclonal setting without the isolation of single-cell clones.
The parental HeLa cell line is an HPV18-positive cervical adenocarcinoma line with an aneuploid karyotype and integrated HPV18 sequences. As one of the most widely used human cell models, HeLa cells are extensively employed in cancer biology, signal transduction, and cellular stress research. Their robust proliferation and well-characterized molecular landscape render them an ideal host for exploring kinase signaling and translational control mechanisms.
EIF2AK4 (GCN2) is a stress kinase that senses amino acid deficiency via uncharged tRNAs binding to its histidyl-tRNA synthetase-like domain, with participation of GCN1 and GCN20. Upon activation, GCN2 phosphorylates eIF2?? (EIF2S1) at Ser51, suppressing general translation while promoting ATF4 translation. ATF4 then drives transcription of genes such as CHOP (DDIT3), ASNS, SESN2, and ULK1, thereby coordinating the integrated stress response (ISR). The pathway modulates amino acid metabolism, redox balance, and autophagy. GCN2 interacts with the ribosome, IMPACT, and mTORC1, integrating nutrient and stress signals.
In HeLa cells, EIF2AK4-mediated amino acid surveillance is particularly relevant given the metabolic demands of transformed cervical epithelial cells. Cancer cells frequently encounter nutrient-limited microenvironments, and the ISR supports adaptation and survival. Disruption of EIF2AK4 in this polyclonal HeLa population allows investigators to dissect how loss of GCN2 function alters stress signaling, translation, and cell viability under amino acid deprivation. The polyclonal nature mitigates the risk of clonal artifacts while providing a robust model for target validation and pathway analysis.
Typical experiments include immunoblotting for phospho-eIF2??, ATF4, and CHOP; RT-qPCR of ATF4 targets (ASNS, SESN2); amino acid deprivation viability assays; polysome profiling; ATF4 reporter assays; immunofluorescence; and co-immunoprecipitation. The polyclonal knockout population is valuable for investigating the ISR, cancer adaptation to amino acid scarcity, translational control, autophagy, and drug resistance. For additional information, contact Ascent Research.
