The CBX3 Knockout HeLa Polyclonal Cells constitute a CRISPR/Cas9-mediated gene-disrupted pool, offering a loss-of-function model to investigate the roles of the CBX3 gene encoding HP1??. This polyclonal cell population is generated through targeted disruption of the endogenous CBX3 locus in HeLa cells, enabling bulk-level analysis of functional consequences without single-cell clonal selection. Researchers gain a robust tool for dissecting chromatin organization and transcriptional repression mechanisms in an experimentally tractable human cell system. The knockout format provides a heterogeneous collection of edited alleles, suitable for population-averaged assays in epigenetics and cancer biology.
The host cell line, HeLa, is a widely used human epithelial cell model derived from a cervical adenocarcinoma in 1951, containing integrated human papillomavirus type 18 (HPV18) sequences. These cells exhibit characteristic hallmarks of viral oncogenesis, including deregulated cell cycle control and aberrant signaling networks, making them particularly relevant for studying tumorigenic processes. HeLa cells sustain active heterochromatin domains and epigenetic regulation, offering an appropriate background to examine the impact of CBX3 ablation on chromatin structure and gene expression programs linked to malignancy.
At the molecular level, CBX3 (HP1??) functions as a reader of trimethylated histone H3 lysine 9 (H3K9me3), a modification deposited by the methyltransferase SUV39H1. CBX3 binding to H3K9me3 promotes heterochromatin assembly and transcriptional silencing by recruiting corepressor complexes and stabilizing repressive chromatin states. This protein operates downstream of TGFB1 and Wnt/??-catenin signaling, and upstream of cell cycle regulators such as CCNA2 (Cyclin A2) and CCNE1, as well as epithelial?Cmesenchymal transition (EMT) markers including CDH1 (E-cadherin), VIM (vimentin), SNAI1, MMP2, and MMP9. CBX3 interacts with multiple nuclear factors, including HP1 family members CBX5 (HP1??) and CBX1 (HP1??), the lamin B receptor, and the retinoblastoma protein RB1, thereby integrating epigenetic and cell-cycle regulatory networks.
Disruption of CBX3 in HeLa cells is predicted to compromise heterochromatin integrity, leading to derepression of silenced loci and altered transcriptional programs. Given the role of CBX3 in tethering heterochromatin to the nuclear periphery and maintaining repressive marks, knockout cells may exhibit enhanced expression of EMT-associated genes and altered cell cycle dynamics. This model enables investigation of how loss of HP1?? modulates proliferative capacity, invasive potential, and response to upstream stimuli, providing insights into epigenetic drivers of cervical carcinoma progression and, more broadly, metastatic phenotypes observed in breast, prostate, lung, and colorectal cancers.
Typical applications of this polyclonal knockout product span chromatin biology, cancer epigenetics, and cell signaling research. Scientists can employ chromatin immunoprecipitation?Cquantitative PCR (ChIP?CqPCR) to measure H3K9me3 enrichment at target loci, RT-qPCR to profile expression changes in CDH1, VIM, CCNA2, and other downstream effectors, and immunofluorescence to visualize heterochromatin foci disruption. Functional assays including flow cytometry for cell cycle distribution, wound-healing migration, and transwell invasion provide complementary phenotypic readouts. Transcriptome-wide RNA sequencing further reveals global gene regulatory shifts. For further information or technical support, please contact Ascent Research.
