The IMPACT Knouckout Jurkat Polyclonal Cells constitute a CRISPR/Cas9-edited polyclonal knockout cell population in which the IMPACT gene has been disrupted to create a loss-of-function model within the Jurkat T lymphoblastoid cell line. This product provides researchers with a versatile tool to dissect IMPACT-dependent translational regulation and its integration with stress signaling pathways.
The host Jurkat cell line, specifically clone E6-1, is an immortalized human T lymphocyte line established from the peripheral blood of a 14-year-old male with acute T cell leukemia. Jurkat cells are extensively employed as a model system for investigating T cell receptor signaling, apoptosis mechanisms, and leukemogenesis, owing to their robust proliferative capacity and well-characterized signaling networks.
IMPACT functions as a translational regulator that inhibits GCN2 kinase activity, thereby restricting phosphorylation of the ?? subunit of eukaryotic initiation factor 2 (eIF2??) and suppressing the integrated stress response (ISR). IMPACT interacts with GCN1, GCN2, and RACK1 under basal conditions, preventing unconstrained GCN2 activation. Upon IMPACT disruption, GCN2-mediated eIF2?? phosphorylation is derepressed, leading to enhanced translation of ATF4, a transcription factor that orchestrates ISR target gene expression. This signaling axis intersects with mTORC1-mediated translational control through shared downstream effectors such as S6K and 4E-BP1, linking amino acid sensing and growth factor signaling to global protein synthesis rates.
In Jurkat cells, IMPACT knockout is expected to unleash GCN2 activity, resulting in constitutive or sensitized eIF2?? phosphorylation and downstream ATF4-CHOP pathway engagement. This dysregulation of the ISR can compromise T cell proliferation, survival, and activation under nutrient deprivation or other stress conditions. Consequently, the model offers a physiologically relevant platform to explore how translational control mechanisms contribute to leukemic cell fitness, stress adaptation, and immune cell dysfunction.
Researchers can utilize this polyclonal knockout population to examine translational reprogramming during T cell activation, employing techniques such as phospho-eIF2?? immunoblotting, RT-qPCR for ATF4 and CHOP, and flow cytometry-based cell cycle and apoptosis analyses. The model is amenable to amino acid deprivation studies and high-throughput screening campaigns designed to identify ISR modulators. Transcriptomic profiling via RNA-seq further enables comprehensive assessment of gene expression changes downstream of IMPACT loss. For additional product information and technical support, please contact Ascent Research.
