The DNAJB14 Knockout A-549 Polyclonal Cells product is a CRISPR/Cas9-edited polyclonal knockout cell population derived from the A-549 human lung adenocarcinoma cell line. In this model, the DNAJB14 gene has been disrupted using CRISPR/Cas9 ribonucleoprotein complexes to generate a loss-of-function pool of cells. As a polyclonal population, it captures the diversity of editing outcomes, enabling robust functional studies without the clonal selection bottlenecks that can introduce unintended biases. Researchers may use this tool to dissect the role of DNAJB14 in cellular proteostasis and stress response pathways.
The parental A-549 cell line is an established in vitro model of lung adenocarcinoma, characterized by a KRAS gain-of-function mutation and wild-type p53 status. These cells are widely employed in oncology research for studying tumor cell biology, drug resistance, and signaling networks. The epithelial origin and adherent growth properties make A-549 cells amenable to a broad range of experimental manipulations, including CRISPR-based genome editing and high-content screening assays.
DNAJB14 encodes a J-domain-containing Hsp40 co-chaperone that partners with Hsp70 family members, such as HSPA1A and HSPA8, to facilitate ATP-dependent protein folding and refolding of misfolded substrates. It operates downstream of the HSF1 transcription factor and the unfolded protein response sensors ATF6, IRE1, and PERK. DNAJB14 interacts with Hsp70, Hsp90, and BAG co-chaperones to deliver client proteins for refolding or degradation. Knockout disrupts this proteostasis machinery, leading to misfolded protein accumulation and sensitization to proteotoxic stress.
In the KRAS-mutant A-549 background, loss of DNAJB14 is predicted to heighten dependency on compensatory quality control pathways, providing a valuable system to investigate how cancer cells cope with increased protein folding demands. This model enables the study of stress response networks such as the heat shock response and ER stress under conditions of impaired co-chaperone function. It is particularly useful for exploring mechanisms of drug sensitivity to proteasome inhibitors or Hsp90 inhibitors, as DNAJB14-deficient cells may exhibit altered thresholds for apoptosis induction.
Typical techniques include Western blot/RT-qPCR for expression analysis, flow cytometry for apoptosis quantification under heat shock or drug treatment, proteasome activity assays, immunoprecipitation for Hsp70-substrate interactions, and protein aggregation assays. Heat shock survival assays further assess stress resilience. This polyclonal knockout tool is suited for cancer biology and proteostasis research. For lot-specific editing efficiency or technical support, please contact Ascent Research.
