The EIF2AK4 Knockout Huh-7 Polyclonal Cells represent a CRISPR/Cas9-edited polyclonal cell population derived from the Huh-7 hepatocellular carcinoma cell line, engineered to disrupt expression of the EIF2AK4 gene. This knockout model abrogates the function of GCN2 (general control nonderepressible 2), a key stress-responsive kinase that serves as the primary sensor of amino acid deprivation in mammalian cells. The polyclonal format offers a heterogeneous pool of gene-edited cells, enabling robust population-level analyses of EIF2AK4-dependent phenotypes without clonal bias. This product is intended for advanced biomedical research applications investigating the integrated stress response (ISR), amino acid sensing, and their roles in liver cancer biology.
The parental Huh-7 cell line is a well-differentiated, adherent epithelial line originally established from a hepatocellular carcinoma of a 57-year-old Japanese male. Widely utilized as a model system for hepatocyte function and liver cancer, Huh-7 cells are permissive to hepatitis C virus (HCV) replication and are extensively employed in studies of hepatocellular carcinoma (HCC) pathogenesis, viral hepatitis, and hepatic drug metabolism. Their epithelial morphology and stable growth characteristics make them suitable for a range of functional assays following gene editing, including stress-response experiments, viability assessments, and signaling pathway interrogation.
EIF2AK4 encodes GCN2, a kinase that mediates the integrated stress response. Under amino acid starvation, uncharged tRNAs bind GCN2, triggering autophosphorylation and activation. Active GCN2 phosphorylates eIF2??, attenuating global translation while selectively increasing ATF4 translation. ATF4 induces stress-responsive genes such as CHOP, GADD34, and ASNS. GCN2 activity is regulated by UV radiation, proteasome inhibition, and ribosome stalling, and interacts with GCN1, the eIF2 complex, and IMPACT. This kinase interfaces with mTOR and MAPK pathways.
In the context of hepatocellular carcinoma, the GCN2?CeIF2???CATF4 axis holds particular significance. Liver tumors frequently encounter microenvironmental stresses including nutrient limitation and hypoxia, conditions that trigger adaptive responses potentially exploited by cancer cells for survival and growth. Disruption of EIF2AK4 in Huh-7 cells allows researchers to dissect the contribution of GCN2-dependent signaling to HCC cell viability under amino acid deprivation, to the development of cancer cachexia, and to the cellular response to viral infection. The Huh-7 background provides a clinically relevant platform for probing the intersection of tumor metabolism, stress adaptation, and liver-specific pathology.
This knockout cell population is a versatile tool for studying the integrated stress response. Typical applications include amino acid withdrawal time-courses, western blotting for phospho-eIF2??, ATF4, and CHOP, and RT-qPCR of ATF4 targets. Polysome profiling and metabolic labeling quantify translation changes, while cell viability assays under stress conditions validate GCN2 as a therapeutic target in HCC. The cells are also suitable for investigating stress granule dynamics. For further information, contact Ascent Research.
