H1-2 Knockout HeLa Polyclonal Cells are a CRISPR/Cas9-edited polyclonal knockout cell population derived from HeLa cells. Engineered via CRISPR/Cas9-mediated gene disruption, these cells lack functional histone H1.2 protein, providing a heterogeneous loss-of-function model. By eliminating H1.2, researchers can investigate linker histone-dependent chromatin compaction and apoptotic signaling without the confounding effects of clonal selection.
HeLa cells are epithelial cells originating from a cervical adenocarcinoma positive for human papillomavirus type 18 (HPV18). As a widely employed cancer cell line, HeLa offers stable growth and a well-characterized molecular profile, making it an ideal host for CRISPR-based editing. This background provides a consistent platform for studying gene function in a disease-relevant context.
H1.2 is a linker histone that binds nucleosomes to promote higher-order chromatin structure, regulating gene accessibility. Upon DNA damage, H1.2 translocates from chromatin to the cytoplasm and interacts with cytochrome c (CYCS) to facilitate apoptosome assembly, directly connecting chromatin reorganization to apoptosis. Upstream regulators include TP53, E2F transcription factors, and CDK/cyclin complexes, while downstream targets encompass apoptotic DNA fragmentation and MYC-regulated genes. H1.2 participates in the intrinsic apoptosis pathway by engaging with BAX, TP53, APAF1, and caspases, forming part of the TP53?CBCL2?CAPAF1?Ccaspase signaling cascade.
In HeLa cells, where HPV18 oncoproteins inactivate TP53 and Rb pathways, H1-2 knockout enables precise analysis of linker histone functions in genomic stability and apoptosis resistance. This model is particularly suited for investigating how chromatin architecture influences DNA damage responses and for screening therapeutic compounds that target chromatin remodeling or apoptotic signaling in a cancer context.
Researchers can utilize these knockout cells for chromatin accessibility profiling via ATAC-seq, gene expression analysis by RT-qPCR, and validation of H1-2 depletion by Western blotting. Apoptosis studies using Annexin V staining and DNA damage response assessment through ??H2AX foci formation are directly applicable. Cell viability assays under genotoxic stress further allow examination of H1-2’s role in chemosensitivity. For more detailed information, please contact Ascent Research.
