The HSPA6 Knockout HT29 Polyclonal Cells are a CRISPR/Cas9-edited polyclonal cell population derived from the human colorectal adenocarcinoma HT29 cell line, designed for targeted disruption of the HSPA6 gene. This polyclonal knockout model provides a heterogeneous pool of genome-edited cells harboring diverse loss-of-function mutations, enabling robust functional studies within a cell population context. The polyclonal format reduces clonal artifacts and permits assessment of gene knockout effects across a representative ensemble of edited cells, making it suitable for functional genomics and drug discovery applications.
The parental HT29 cell line is a well-characterized model of human colorectal adenocarcinoma, originally established from a primary tumor of a female patient. These epithelial cells are extensively used in cancer biology to study intestinal tumorigenesis, drug absorption and transport, and chemotherapeutic response. HT29 cells retain features of intestinal epithelium and provide a versatile platform for investigating colorectal cancer pathogenesis and therapeutic interventions.
HSPA6 encodes a stress-inducible member of the HSP70 chaperone family, transcriptionally activated by HSF1 under conditions such as heat stress, oxidative stress, heavy metal exposure, or proteasome inhibition. The protein functions to maintain proteostasis by preventing aggregation of misfolded proteins, refolding damaged polypeptides, and targeting irreversibly misfolded clients for degradation via the ubiquitin-proteasome system. Mechanistically, HSPA6 interacts with HSP40 co-chaperones for substrate recognition, associates with BAG family members including BAG3 to regulate chaperone activity, and cooperates with the E3 ubiquitin ligase CHIP to promote ubiquitination of terminally misfolded substrates. Through these interactions, HSPA6 links the heat shock response and unfolded protein response to cell survival decisions under proteotoxic stress.
In the context of HT29 colorectal cancer cells, HSPA6 knockout offers a valuable tool to dissect the contribution of stress-inducible chaperones to tumor cell biology. Colorectal tumor cells face intrinsic proteotoxic pressure from rapid proliferation and extrinsic stressors in the intestinal microenvironment; thus, this model enables investigation of how loss of HSPA6 affects tumor cell viability, proliferation, and adaptation to therapeutic challenge. It is particularly relevant for exploring mechanisms of chemoresistance, as HSP70 family members often protect cancer cells from drug-induced apoptosis.
Researchers can employ these polyclonal HSPA6 knockout HT29 cells in a variety of assays, including Western blotting and RT-qPCR for stress-induced gene expression, cell viability and colony formation analyses under proteotoxic conditions, proteasome activity measurements, and immunofluorescence detection of protein aggregation. The model is well-suited for drug sensitivity profiling and RNA-sequencing studies to map the stress response transcriptome in the absence of HSPA6. For further information, please contact Ascent Research.
