This CRISPR/Cas9-edited polyclonal knockout cell population targets KDM6B in the NCI-H1975 human lung adenocarcinoma cell line, providing a robust loss-of-function tool for epigenetic and cancer biology investigations. The knockout is generated through CRISPR/Cas9-mediated gene disruption, yielding a heterogeneous pool of edited cells. This polyclonal format avoids clonal selection artifacts and is ideally suited for population-based assays such as RNA sequencing, chromatin immunoprecipitation, and bulk proteomics where maintaining biological variability is advantageous.
The NCI-H1975 host line is a widely used non-small cell lung cancer (NSCLC) model derived from a lung adenocarcinoma patient. These cells carry a TP53 R273H missense mutation that abrogates p53 tumor suppressor function, whereas the EGFR and KRAS genes remain wild-type. Consequently, NCI-H1975 cells are particularly valuable for investigating p53-related signaling defects and for testing therapeutic strategies in a genetically defined adenocarcinoma background.
KDM6B (JMJD3) functions as an H3K27me3-specific histone demethylase, counteracting the repressive activity of Polycomb Repressive Complex 2 (PRC2). By removing the trimethyl mark at gene promoters, KDM6B enables transcriptional activation of key targets such as CDKN1A (p21), BCL2L11 (BIM), CDH1, SNAI1, and HOXA cluster genes. This activity is tightly controlled by upstream inputs, including TGF-??/TGFBR1/SMAD2/3, TNF-??/NF-??B p65, Notch/NICD, and JAK/STAT3 pathways, and is coordinated through interactions with MLL3/4 complexes, UTX, ASXL1, BAP1, and TP53. Disrupting KDM6B alters the chromatin landscape, leading to aberrant expression of genes that govern cell proliferation, apoptosis, and inflammatory responses.
In the NCI-H1975 context, KDM6B knockout is particularly instructive because of the concurrent TP53 mutation. KDM6B physically interacts with p53 and regulates CDKN1A and BCL2L11, making its loss consequential for cell cycle control and drug-induced apoptosis. Furthermore, the knockout dysregulates Notch, TGF-??, and NF-??B signaling, pathways frequently co-opted in lung adenocarcinoma to drive inflammation, migration, and therapeutic resistance. This model therefore offers a powerful system to study epigenetic dependencies in p53-mutant NSCLC.
Typical applications include ChIP-qPCR to survey H3K27me3 occupancy, RNA-seq for global expression profiling, Western blotting for target validation, and functional assays such as cell proliferation, apoptosis, migration, and drug sensitivity testing. This polyclonal knockout model is an essential resource for researchers examining epigenetic regulation in lung cancer, inflammation, and beyond. For ordering or technical support, please contact Ascent Research.
