The HP1BP3 Knockout HeLa Polyclonal Cells provide a powerful CRISPR/Cas9-edited polyclonal knockout cell population for studying heterochromatin organization and epigenetic regulation in a widely used human cancer model. This product consists of a polyclonal pool of HeLa cells carrying targeted disruptions in the HP1BP3 gene, generating a loss-of-function model without clonal selection. The resulting population enables robust investigation of HP1BP3-dependent chromatin dynamics, gene silencing, and cell cycle control, offering a versatile tool for mechanistic and translational research in chromatin biology and oncology.
HeLa cells, derived from a cervical adenocarcinoma, are a classic immortalized epithelial line exhibiting aneuploidy, HPV18 integration, and inactivation of p53 and Rb tumor suppressors. These properties make HeLa cells particularly suitable for dissecting pathways that govern genomic stability, heterochromatin maintenance, and transcriptional regulation. The host cell background retains key features of transformed cervical epithelium, allowing researchers to evaluate HP1BP3 function in a disease-relevant context characterized by compromised cell cycle checkpoints and heightened genomic irregularity.
HP1BP3 is a linker histone-like protein that functions as a critical adaptor for heterochromatin protein 1 (HP1) isoforms, including CBX1 (HP1??), CBX3 (HP1??), and CBX5 (HP1??). By binding core histones and nucleosomes, HP1BP3 recruits HP1 proteins to specific genomic loci, thereby promoting chromatin compaction and transcriptional repression. Its activity is regulated by cell cycle signals, notably cyclin-dependent kinase CDK1, and it operates within a network involving histone methyltransferases SUV39H1, SUV39H2, and KMT5A, as well as the lamin B receptor. Disruption of HP1BP3 uncouples this molecular machinery, leading to defects in heterochromatin assembly, mitotic chromosome condensation, and silencing of ribosomal RNA genes, with downstream consequences for genome-wide chromatin architecture and gene expression programs.
In the HeLa cell system, HP1BP3 knockout provides a direct means to interrogate how heterochromatin dysregulation contributes to cancer cell phenotypes. The transformed, HPV18-positive background amplifies the impact of epigenetic perturbations, facilitating the study of genomic instability, aberrant chromosome segregation, and altered cell cycle progression. Researchers can exploit this model to elucidate the interplay between viral oncoproteins and host chromatin organizers, and to identify vulnerabilities arising from disrupted heterochromatin maintenance that may be exploited for therapeutic intervention in cervical and other cancers.
This polyclonal knockout population is ideally suited for a wide range of experimental approaches. Common applications include western blotting and RT-qPCR to verify HP1BP3 depletion, ChIP-qPCR to map HP1 localization and histone modifications, immunofluorescence to visualize heterochromatin foci, and flow cytometry for cell cycle profiling. Functional assays such as colony formation, RNA-seq transcriptome analysis, and mitotic spread examination can further define the phenotypic consequences of HP1BP3 loss. Co-immunoprecipitation enables assessment of HP1 protein interactions. For additional details and technical support, please contact Ascent Research.
