The DNAJC5 Knockout A-549 Polyclonal Cells represent a CRISPR/Cas9-edited polyclonal cell population derived from the human A-549 lung adenocarcinoma cell line, in which the DNAJC5 gene has been disrupted via CRISPR/Cas9-mediated gene editing. This product provides a loss-of-function model for investigating the cellular roles of CSP?? (cysteine string protein alpha), the protein product of DNAJC5, in a non-neuronal epithelial background.
The parental A-549 cell line was originally established from the alveolar basal epithelial tissue of a 58-year-old Caucasian male with lung adenocarcinoma. These cells serve as a widely used model for human alveolar type II epithelium and are extensively employed in studying lung adenocarcinoma biology, including oncogenic signaling, drug resistance, and epithelial function. Their adherent epithelial morphology and robust growth characteristics make them suitable for a variety of functional assays.
The DNAJC5 gene encodes CSP??, a synaptic vesicle-anchored J-domain co-chaperone that works in concert with heat shock cognate 70 (Hsc70/HSPA8) to facilitate protein folding and regulate SNARE complex assembly. CSP?? interacts directly with Hsc70 and SNARE components such as SNAP-25 and syntaxin, ensuring proper exocytosis and synaptic vesicle cycling. It is also implicated in chaperone-mediated protein folding and the autophagy-lysosomal pathway. Upstream regulators include CREB1 and NRF2, while downstream targets encompass SNARE machinery and lysosomal biogenesis factors. The mechanistic summary indicates that CSP?? knockout disrupts Hsc70 co-chaperone activity, impairing SNARE complex formation and leading to defective exocytosis, accumulation of misfolded client proteins, and potential lysosomal dysfunction.
Although DNAJC5 is classically associated with neuronal functions and its loss-of-function mutations cause adult-onset neuronal ceroid lipofuscinosis (ANCL), CSP?? is expressed in various tissues, including the lung. In the A-549 epithelial background, this knockout model enables researchers to dissect the non-neuronal roles of CSP??, such as its contribution to protein homeostasis (proteostasis), secretory pathway regulation, and lysosomal integrity in cancer cells. By eliminating CSP?? expression, the cells provide a unique system to study how disruptions in chaperone networks influence epithelial cell biology, potentially revealing vulnerabilities relevant to lung adenocarcinoma.
This polyclonal knockout product is ideally suited for a broad range of applications, including examining chaperone-mediated protein folding mechanisms, investigating SNARE-dependent secretion in cancer cells, and modeling the cellular consequences of CSP?? deficiency associated with neurodegenerative diseases like ANCL, Parkinson??s, Huntington??s, and Alzheimer??s. Researchers can employ Western blotting to confirm CSP?? loss, RT-qPCR to assess DNAJC5 mRNA levels, immunofluorescence for SNARE localization, co-immunoprecipitation for Hsc70 interactions, autophagy flux and lysosomal activity assays, as well as cell viability tests under proteotoxic stress. For further details, please contact Ascent Research.
