The DNAJC1 Knockout NCI-H1299 Polyclonal Cells comprise a CRISPR/Cas9-edited polyclonal knockout cell population engineered for gene-targeted disruption of DNAJC1 in the NCI-H1299 human non-small cell lung carcinoma cell line. This product provides a heterogeneous pool of cells with loss-of-function at the DNAJC1 locus, enabling functional studies of DNAJC1-dependent processes without the requirement for single-cell cloning. The polyclonal format preserves population-level genetic diversity while abrogating DNAJC1 activity, facilitating robust and reproducible investigation of co-chaperone biology in a physiologically relevant cancer model.
The host cell line NCI-H1299 is a widely used epithelial model of lung adenocarcinoma, originally derived from a metastatic lymph node of a male patient with non-small cell lung carcinoma. These cells exhibit adherent growth and retain key features of their adenocarcinoma origin, rendering them suitable for mechanistic studies of lung cancer biology, including oncogenic signaling, tumor progression, and stress adaptation. The NCI-H1299 line is particularly valued for its genetic tractability and relevance to human disease, making it an ideal background for dissecting the contributions of individual genes such as DNAJC1 to tumor cell homeostasis.
DNAJC1 encodes an endoplasmic reticulum (ER)-resident co-chaperone belonging to the Hsp40/DnaJ family. It specifically interacts with HSP70 family chaperones, including HSPA8 and HSPA1A, to stimulate their ATPase activity, thereby enhancing the recognition and processing of misfolded proteins. DNAJC1 functions directly within the ER-associated degradation (ERAD) pathway, where it partners with core ERAD components such as DERL1, SEL1L, and the E3 ubiquitin ligase HRD1 to facilitate substrate retrotranslocation and proteasomal degradation. DNAJC1 acts downstream of canonical ER stress sensors, including IRE1??, PERK, and ATF6, and its activity modulates the amplitude of the unfolded protein response (UPR). Upon DNAJC1 loss, ERAD efficiency declines, leading to accumulation of substrates like CFTR??F508 and compensatory upregulation of UPR target genes, notably the chaperone BiP/GRP78 and the transcription factor XBP1.
In the context of NCI-H1299 lung adenocarcinoma cells, DNAJC1 knockout represents a powerful model to study the dependency of cancer cells on ER protein quality control. Non-small cell lung carcinomas frequently encounter proteotoxic stress driven by oncogene activation, genomic instability, and hypoxic tumor microenvironments. By ablating a central ERAD co-chaperone, this polyclonal knockout population permits assessment of how disrupted proteostasis affects tumor cell viability, proliferation, and adaptation to ER stress. The model enables dissection of DNAJC1??s role in regulating UPR signaling dynamics and may uncover vulnerabilities that can be exploited therapeutically in lung cancer, particularly in the context of proteostasis-targeted agents.
Researchers can employ these polyclonal knockout cells in a diverse array of experimental paradigms to interrogate ER stress biology and chaperone networks. Typical applications include longitudinal monitoring of UPR activation via Western blotting of phosphorylated IRE1??, PERK, and induced BiP/GRP78; transcriptomic analysis by RNA-seq or RT-qPCR to quantify changes in XBP1 splicing and other UPR target genes; and functional assays to measure proteasomal degradation rates of ERAD substrates. Drug sensitivity studies using ER stress inducers such as tunicamycin or thapsigargin, coupled with apoptosis detection by flow cytometry, can delineate the role of DNAJC1 in determining therapeutic response. Immunofluorescence microscopy further allows visualization of ER morphology and chaperone redistribution. For further technical details and ordering information, please contact Ascent Research.
