The DNAJC5 Knockout NCI-H1299 Polyclonal Cells are a CRISPR/Cas9-edited polyclonal knockout population of NCI-H1299 human lung adenocarcinoma epithelial cells. In this model, the DNAJC5 gene has been disrupted via CRISPR/Cas9-mediated gene editing, resulting in a heterogeneous pool of cells with loss-of-function mutations in the endogenous DNAJC5 locus. This polyclonal format provides a broad representation of knockout alleles, enabling robust analysis of gene function without clonal isolation artifacts. The targeted disruption eliminates expression of the DNAJC5-encoded protein, cysteine string protein alpha (CSP??), a key co-chaperone involved in SNARE complex regulation.
NCI-H1299 is a widely used non-small cell lung cancer model derived from the lymph node metastasis of a male patient’s lung adenocarcinoma. These p53-null epithelial cells are instrumental in cancer biology studies, offering a reproducible platform for investigating tumor signaling, drug sensitivity, and metastatic mechanisms. Their genetic homogeneity and well-characterized phenotype facilitate accurate interpretation of gene knockout effects in a clinically relevant cancer context.
DNAJC5 encodes CSP??, a presynaptic co-chaperone that recruits Hsc70 and SGT to the SNARE complex, promoting the folding and assembly of SNARE proteins SNAP-25, syntaxin-1, and VAMP2. This activity is essential for synaptic vesicle exocytosis and regulated secretion. Upstream, CSP?? expression is stimulated by neuronal depolarization and Ca2+ influx via CREB. The CSP??-Hsc70-SGT axis therefore constitutes a critical chaperone network maintaining SNARE complex integrity. Its dysfunction is linked to neurodegenerative disorders, including neuronal ceroid lipofuscinosis (CLN4) and Parkinson??s disease.
In NCI-H1299 cells, loss of CSP?? permits dissection of its non-neuronal roles in secretory pathways and protein quality control. CSP?? may influence cancer cell secretion of growth factors and exosomes, impacting tumor microenvironment communication. Additionally, CSP????s involvement in chaperone-mediated autophagy suggests that its knockout could alter stress responses and proteostasis in p53-null lung adenocarcinoma, providing insights into cancer cell survival and metastasis.
Researchers can employ western blotting to verify CSP?? knockdown and monitor SNARE/chaperone levels, co-immunoprecipitation to analyze Hsc70-CSP?? interactions, immunofluorescence for CSP?? localization, and functional assays for secretion and autophagy flux analysis. These readouts enable investigations of chaperone-mediated quality control, SNARE assembly, neurodegenerative disease modeling in non-neuronal cells, and secretion pathways in lung cancer. For more information, please contact Ascent Research.
