The EIF2AK4 Knockout HEK293 Polyclonal Cells are a heterogenous pool of HEK293-derived cells engineered by CRISPR/Cas9-mediated gene disruption at the EIF2AK4 locus, generating a polyclonal knockout model. This product format retains population-level genetic diversity, avoiding clonal selection artifacts. The targeted disruption eliminates functional GCN2 kinase expression, providing a versatile tool to investigate amino acid sensing and the integrated stress response (ISR) without the confounding effects of single-cell-derived clones.
HEK293 cells, derived from human embryonic kidney and transformed with adenovirus 5 DNA, are a well-established epithelial cell line valued for high transfectability and robust recombinant protein expression. Their adherent growth and extensively characterized signaling networks make them a reliable platform for gene knockout studies, particularly for examining stress-responsive pathways such as the ISR.
EIF2AK4 (GCN2) is a serine/threonine kinase that senses amino acid deprivation via uncharged tRNA accumulation. Upon activation, it phosphorylates eIF2?? at Ser51, globally suppressing cap-dependent translation while paradoxically enhancing translation of ATF4. ATF4 transcriptionally upregulates CHOP, GADD34, and amino acid biosynthesis genes such as ASNS. EIF2AK4 function depends on its interaction with GCN1, GCN20, and the ribosome, and is inhibited by IMPACT. Downstream events intersect with mTORC1 signaling and feed-back regulation through PPP1R15A, forming a critical node in nutrient stress adaptation.
In HEK293 cells, EIF2AK4 knockout abolishes eIF2?? phosphorylation during amino acid starvation, preventing ATF4 induction and downstream ISR gene expression. This loss-of-function model uniquely isolates the GCN2 arm of the ISR from other eIF2?? kinases such as PERK. Comparative analyses between wild-type and knockout cultures enable precise dissection of EIF2AK4-dependent signaling pathways, including interactions with mTORC1-mediated nutrient sensing, and facilitate the study of cellular vulnerabilities arising from compromised amino acid homeostasis.
This polyclonal knockout cell population supports diverse experimental approaches: Western blotting for phospho-eIF2?? (Ser51), RT-qPCR for ATF4, CHOP, and ASNS, and ATF4-luciferase reporter assays. Amino acid starvation/recovery protocols, polysome profiling, and RNA-seq permit detailed analysis of translational reprogramming. Applications extend to cancer metabolism, metabolic disorder and neurodegenerative disease research, and chemical screening for ISR modulators. For technical inquiries, please contact Ascent Research.
