DNAJA1 Knockout HEK293T Polyclonal Cells are a CRISPR/Cas9-edited cell population harboring targeted disruptions of the DNAJA1 gene. This polyclonal knockout model provides a loss-of-function system to investigate DNAJA1-dependent co-chaperone functions within a widely used human cell background.
The HEK293T cell line is a human embryonic kidney epithelial derivative of HEK293 cells that stably expresses the SV40 large T antigen. This enables high-copy episomal replication of plasmids containing the SV40 origin of replication, making HEK293T a preferred host for transient transfection, recombinant protein overexpression, lentivirus production, and signal transduction assays. Its robust protein expression and rapid growth facilitate biochemical and cell-based studies requiring consistent, scalable culturing.
DNAJA1 encodes a member of the DnaJ/Hsp40 co-chaperone family that directly binds Hsp70 chaperones (HSPA1A/B) and stimulates their ATPase activity. This co-chaperone?CHsp70 partnership drives conformational cycles essential for protein folding, assembly, trafficking, and degradation. DNAJA1 participates in cellular stress responses by facilitating Hsp70-mediated refolding of heat-denatured proteins and by regulating apoptosis through interactions with Bcl-2 family members and NF-??B pathway components. Its activity is transcriptionally upregulated by HSF1 under proteotoxic stress and can be modulated by co-chaperones such as Hsp90, BAG1, and the E3 ubiquitin ligase CHIP (STUB1). Key client proteins include p53 and steroid hormone receptors, whose maturation and stability rely on Hsp70 cycles stimulated by DNAJA1.
Within the HEK293T background, DNAJA1 knockout disrupts a central node of the Hsp70 chaperone network, sensitizing cells to proteotoxic challenges such as heat shock, oxidative stress, and protein misfolding. Given the HEK293T line??s extensive use in recombinant protein expression, loss of DNAJA1 may impair proper folding of overexpressed client proteins and alter stress-induced signaling pathways. This model enables dissection of Hsp70 co-chaperone specificity in a human epithelial system and provides a platform to study how proteostasis imbalance affects cellular viability, apoptosis regulation, and NF-??B-mediated transcriptional programs.
Researchers can employ these knockout cells in functional studies of Hsp70 co-chaperone biology, protein homeostasis, and stress response mechanisms. Typical applications include assessing the impact of DNAJA1 loss on client protein stability via western blotting, measuring HSF1 transcriptional activity with reporter assays, evaluating cell survival under heat shock or proteasome inhibition, and mapping Hsp70?Cco-chaperone complexes by co-immunoprecipitation. Additional readouts such as caspase-3 activation and RT-qPCR for stress-responsive genes (e.g., HSPA1A, DNAJA1) complement the model??s utility in chaperone-targeted drug screening and investigations of cancer cell vulnerability to proteotoxic stress. Furthermore, these cells can be utilized to screen small-molecule modulators of the Hsp70 machinery and to study how DNAJA1 influences the cellular response to chemotherapeutic agents that induce proteotoxic stress. For additional details, please contact Ascent Research.
