BZW1 Knockout A-549 Polyclonal Cells are a CRISPR/Cas9-edited polyclonal knockout cell population derived from human A-549 lung adenocarcinoma cells. This product features CRISPR/Cas9-mediated disruption of the BZW1 gene, creating a heterogeneous loss-of-function model without clonal isolation. The polyclonal format enables robust analysis of BZW1-dependent phenotypes while minimizing clone-specific artifacts.
The parental A-549 cell line is a well-characterized model of lung adenocarcinoma, derived from type II pneumocytes. It is widely utilized to study epithelial cancer cell biology, including stress adaptation and therapeutic resistance. This background provides a relevant context for investigating BZW1??s role in translational control under pathophysiological conditions.
BZW1 is a translation initiation factor that promotes reinitiation on uORF-containing mRNAs, most notably enhancing ATF4 translation during stress. Its activity is linked to the integrated stress response: upstream signals such as amino acid deprivation and ER stress activate GCN2 kinase, leading to eIF2?? phosphorylation and selective translation of stress-induced transcripts. BZW1 interacts with the eIF3 complex, eIF2, the 40S ribosomal subunit, and eIF4G, facilitating ribosomal reinitiation downstream of ATF4??s uORFs. Consequently, BZW1 modulates expression of ATF4 targets including CHOP and GADD34, integrating mTORC1 and eIF2?? signaling pathways.
In A-549 lung cancer cells, BZW1-mediated translational control is implicated in adaptive responses to nutrient deprivation and proteotoxic stress. Disrupting BZW1 allows investigation of how uORF-driven expression of ATF4 and its downstream effectors contributes to tumor cell viability, proliferation, and drug sensitivity. This model enables dissection of the interplay between mTOR signaling, translational reprogramming, and stress-induced gene expression in an epithelial tumor context.
Key applications include western blotting for BZW1 and ATF4, RT?qPCR analysis of ATF4 and CHOP transcripts, and luciferase reporter assays with uORF constructs to quantify translational readthrough. Polysome profiling and ribosome profiling can map translational changes, while co?immunoprecipitation confirms BZW1?eIF3 interactions. Cell viability assays under ER stress or nutrient limitation further elucidate BZW1??s functional role. This polyclonal knockout product supports translational regulation research, cancer stress biology, and targeted drug discovery. For more information, please contact Ascent Research.
