BZW1 Knockout HEK293T Polyclonal Cells are a CRISPR/Cas9-edited polyclonal knockout cell population designed to disrupt the BZW1 gene in the human HEK293T host cell background. This loss-of-function model provides a robust tool for dissecting the molecular mechanisms of translation reinitiation and the integrated stress response. The polyclonal nature of the edited population preserves cellular heterogeneity while eliminating functional BZW1 expression, enabling physiologically relevant studies of stress signaling without the clonal biases inherent in monoclonal lines. The product is supplied as a ready-to-use polyclonal pool, suitable for a wide array of downstream functional and biochemical assays.
HEK293T cells are a widely utilized human embryonic kidney epithelial cell line derivative of the parental HEK293 line. They stably express both the SV40 large T antigen and the adenovirus E1A gene, rendering them highly permissive for plasmid transfection and efficient viral vector production. These features have established HEK293T as a principal workhorse in molecular biology, protein expression, lentiviral packaging, and signal transduction studies. Their robust growth characteristics and genetic tractability make them an ideal host for CRISPR/Cas9-mediated gene disruption, facilitating the investigation of gene function in a well-characterized, physiologically relevant cellular context.
BZW1 encodes a translation reinitiation factor that mimics eIF5 and promotes the synthesis of ATF4 by facilitating reinitiation on mRNAs containing upstream open reading frames (uORFs) during cellular stress. Under conditions that induce eIF2?? phosphorylation??such as ER stress or amino acid deprivation??upstream kinases including PERK, GCN2, PKR, and HRI activate the integrated stress response. BZW1 interacts with the eIF2 complex, eIF3 complex, and the 40S ribosomal subunit to enable ribosomes to resume scanning and reinitiate translation at the ATF4 main open reading frame after translating inhibitory uORFs. Consequently, BZW1 acts as a key mediator downstream of eIF2?? phosphorylation, driving the expression of ATF4 and its transcriptional targets, including CHOP (DDIT3), GADD34 (PPP1R15A), and ASNS. By disrupting BZW1, this knockout model impairs ATF4 induction and attenuates the integrated stress response, providing a clean genetic background to dissect uORF-mediated translational control.
In the HEK293T context, BZW1 knockout is particularly informative given the cell line’s widespread use in studying translational regulation and stress signaling pathways. The robust transfection efficiency and rapid growth of HEK293T cells allow for facile reconstitution experiments, CRISPR-based screens, and biochemical analyses that would be challenging in primary or less tractable systems. Loss of BZW1 in this model enables the direct assessment of alternative reinitiation mechanisms and the contribution of other eIF5-mimic proteins, while also serving as a stringent platform for validating BZW1-specific phenotypes in cancer and neurodegenerative disease research. The polyclonal format further mimics endogenous variability, enhancing the translational relevance of stress response modulation studies.
This knockout cell product is ideally suited for a variety of advanced research applications, including the investigation of integrated stress response dynamics, uORF-dependent translational control, and the validation of pharmacological modulators targeting the PERK/eIF2??/ATF4 axis. Representative assays include Western blotting for ATF4 and CHOP following induction of ER stress with tunicamycin or thapsigargin, polysome profiling to assess ribosome distribution, dual-luciferase uORF reporter assays, transcriptomic profiling via RNA-seq, and ribosome footprinting by ribosome profiling. Cell viability and apoptosis assays under stress conditions can further elucidate the functional consequences of BZW1 loss. For additional technical details, validation data, or ordering information, please contact Ascent Research.
