The H1-4 Knockout HeLa Polyclonal Cells product comprises a CRISPR/Cas9-edited polyclonal population of HeLa cells, generated for targeted disruption of the H1-4 gene. This polyclonal knockout format preserves allelic diversity across the cell pool, reflecting heterogeneous gene editing outcomes rather than a single clonal isolate. The cells serve as a loss-of-function model to investigate the biological roles of histone H1.4, a linker histone critical for higher-order chromatin organization. Suitable for both plate-based and single-cell analyses, the population enables robust assessment of chromatin-associated phenotypes in a widely used cancer cell background.
The HeLa host cell line is derived from a human cervical adenocarcinoma, originally obtained from Henrietta Lacks in 1951. These epithelial cells are characterized by HPV18 integration, aberrant cell cycle regulation, and immortalized growth. HeLa cells constitutively express components of the epigenetic and DNA damage response machinery, making them a relevant platform for studying chromatin biology, transcriptional control, and cancer pathogenesis. Their extensive use in genomics and functional assays provides a well-established context for interpreting H1-4 knockout effects.
Histone H1.4, encoded by H1-4, binds nucleosomal linker DNA to stabilize chromatin fibers and drive transcriptional repression. Its expression is regulated by E2F1 and NF-Y during S-phase, and CDK2/Cyclin E phosphorylation modulates its chromatin affinity. H1.4 interacts with NASP, HIRA, HP1??, PARP1, and DNMT1, and cooperates with SWI/SNF and HDAC1 to maintain repressive states. By compacting chromatin, H1.4 represses tumor suppressor and DNA damage response genes. Loss of H1.4 leads to chromatin decompaction, activation of ATM/??H2AX pathways, and altered BAX/BCL2-dependent apoptosis.
In HeLa cells, H1-4 knockout provides a model to study how linker histone loss contributes to oncogenesis. HPV18-driven cervical cancer cells depend on chromatin dysregulation; H1.4 depletion further relaxes chromatin, affecting gene expression and DNA repair. This model is relevant for chromatinopathies and epithelial cancers, enabling dissection of chromatin dynamics, cell cycle progression, and drug sensitivity.
Applications include ATAC-seq for chromatin accessibility, RNA-seq for transcriptomics, Western blot and RT-qPCR for H1-4 validation, and immunofluorescence for histone localization. Functional assays cover proliferation, apoptosis, and cell cycle profiling. DNA damage response via ??H2AX foci assay supports investigations into epigenetic regulation and drug screening. For details, contact Ascent Research.
