The EIF2AK4 Knockout HEK293T Polyclonal Cells are a CRISPR/Cas9-edited polyclonal knockout cell population that enables functional loss of the EIF2AK4 gene. This knockout model disrupts the expression of GCN2, the stress-responsive kinase encoded by EIF2AK4, providing a versatile tool for elucidating amino acid sensing and integrated stress response mechanisms. As a heterogeneous pool of edited cells, this product avoids clonal selection artifacts while maintaining robust gene inactivation suitable for pathway analysis and phenotypic studies.
HEK293T cells are human embryonic kidney epithelial cells stably expressing the SV40 large T antigen, which facilitates high-level episomal replication of transfected plasmids. These cells are widely employed for their high transfection efficiency and robust protein expression, making them ideal for mechanistic studies of intracellular signaling. In the context of knockout models, HEK293T provides a well-characterized and experimentally tractable background for dissecting the functions of stress-responsive kinases in a renal epithelial cell environment.
EIF2AK4 encodes GCN2, a kinase that is activated by uncharged tRNAs during amino acid deprivation. Activated GCN2 interacts with the ribosome-associated scaffold GCN1 and phosphorylates eIF2?? at Ser51, leading to global translation attenuation and selective upregulation of ATF4. ATF4 transcriptionally induces genes such as CHOP and GADD34, which mediate adaptive and apoptotic responses through the integrated stress response. GCN2 signaling is integrated with mTOR and autophagy pathways, with ATF4 driving expression of autophagy-related genes. Key regulators include the inhibitor IMPACT and eIF2?? phosphatase complexes, which temper the response.
Knockout of EIF2AK4 in HEK293T cells removes a central node of amino acid sensing, permitting investigation of GCN2-dependent signaling in renal epithelial physiology. The high transfectability of this host line supports complementation assays with wild-type or mutant GCN2 constructs, enabling structure-function analyses. The polyclonal format avoids clonal biases and is suited for stable pool generation for phenotypic screening or for studying stress response resiliency in a mixed population context.
Typical applications include amino acid starvation experiments with western blot analysis of phospho-eIF2?? and GCN2, RT-qPCR for ATF4 and CHOP, and functional assays such as puromycin incorporation for protein synthesis rates and autophagy flux monitoring via LC3-II turnover. This model is valuable for research into cancer cell metabolism, drug resistance, neurodegenerative diseases, and pulmonary vascular disorders like pulmonary arterial hypertension, where the integrated stress response is implicated. For inquiries, please contact Ascent Research.
