The DNAJC5 Knockout HT29 Polyclonal Cells consist of a CRISPR/Cas9-edited polyclonal knockout cell population with targeted disruption of the DNAJC5 gene in the HT29 human colorectal adenocarcinoma cell line. This heterogeneous pool provides a loss-of-function model suitable for studying DNAJC5-dependent processes without clonal selection biases. Polyclonal populations capture a range of knockout efficiencies, reflecting physiological variability and enhancing experimental robustness. This genetic tool is ideal for functional genomics and drug discovery studies where gene-dependency phenotypes are assessed.
HT29 cells derive from a colorectal adenocarcinoma of a 44-year-old female and serve as a well-characterized model for intestinal epithelial biology. These cells can differentiate into enterocyte-like phenotypes, exhibiting mucin expression and tight junction formation, making them useful for secretion and stress studies. Their transformed nature retains oncogenic signaling features relevant to cancer research. Consequently, HT29 cells offer a relevant substrate for investigating gene contributions to colorectal cancer progression and cellular homeostasis.
DNAJC5 encodes cysteine string protein alpha (CSP??), a synaptic vesicle-associated cochaperone activated by HSF1 under stress. CSP?? recruits HSC70 to SNARE complexes, directly interacting with SNAP-25 and syntaxin to regulate SNARE assembly and disassembly, thus facilitating exocytosis. CSP?? also acts as a holdase, preventing aggregation of misfolded proteins and protecting cells from proteotoxic stress. Its interactions with synaptotagmin and the co-chaperone SGT underscore its central role in chaperone-mediated protein quality control.
In HT29 cells, DNAJC5 knockout allows exploration of non-neuronal CSP?? functions, including protein secretion and stress resilience. The CSP??-HSC70 chaperone axis may buffer proteotoxic stress in rapidly dividing cancer cells, and its loss could disrupt secretory competence and aggregation management. This model thus provides insights into how colorectal adenocarcinoma cells cope with protein misfolding, potentially revealing therapeutic vulnerabilities linked to proteostasis. Elucidating these roles could inform therapeutic strategies targeting tumor-specific proteostatic dependencies.
Applications include protein secretion studies using secretion assays and immunofluorescence, stress response profiling with agents like thapsigargin, and protein aggregation modeling. Verification of knockout via western blotting and RT-qPCR, combined with cell viability assays under proteotoxic challenge, enables functional dissection of the CSP??-mediated network. This polyclonal knockout pool is a versatile tool for chaperone biology and cancer research. For further details, contact Ascent Research.
