The BAZ1B Knockout HeLa Polyclonal Cells product comprises a heterogeneous population of HeLa cervical adenocarcinoma cells engineered via CRISPR/Cas9-mediated disruption of the BAZ1B gene, introducing loss-of-function mutations across the polyclonal pool. This polyclonal knockout configuration preserves population-level genetic variation, modeling a spectrum of editing outcomes and mitigating clonal selection biases often associated with single-cell-derived knockout lines.
The HeLa host cell line originates from a human cervical adenocarcinoma and is distinguished by its HPV18-positive status and functional inactivation of the p53 and RB tumor suppressor pathways. These immortalized epithelial cells provide a robust and widely utilized platform for studying chromatin biology, transcriptional regulation, and DNA repair mechanisms in a cancer-relevant context.
BAZ1B functions as a core subunit of the WICH and B-WICH chromatin remodeling complexes, mediating ATP-dependent nucleosome repositioning through direct interaction with the SNF2H ATPase (SMARCA5). It is implicated in RNA polymerase I transcription regulation at rDNA loci, where it modulates 45S pre-rRNA synthesis, and participates in DNA damage response pathways by affecting the expression or function of repair factors such as BRCA1 and RAD51. Upstream, BAZ1B activity is influenced by the MYC transcription factor and the DNA damage-activated kinases ATM/ATR, while downstream it contributes to cell cycle control via CDKN1A/p21. The complex also includes MYBBP1A, DEK, DDX21, and nucleolin, collectively linking chromatin dynamics to transcriptional and genomic stability.
In the HeLa background, where p53 and RB tumor suppressors are already compromised, loss of BAZ1B is expected to further perturb chromatin-mediated regulatory networks, potentially exacerbating genomic instability or altering transcriptional programs relevant to oncogenesis. This model enables dissection of BAZ1B-dependent effects on rRNA biogenesis and DNA repair capacity in a cellular environment predisposed to replicative stress, offering insight into its roles in neurodevelopmental disorders like Williams-Beuren syndrome and in cancer progression.
Researchers can employ this polyclonal knockout cell population to investigate BAZ1B function through a suite of molecular and cellular techniques. Western blotting and immunofluorescence allow confirmation of BAZ1B loss and assessment of its subcellular localization impacts, while RT-qPCR or RNA-seq quantifies changes in rRNA precursor levels and global transcriptome alterations. Chromatin immunoprecipitation (ChIP-qPCR) enables mapping of residual WICH complex occupancy at rDNA or DNA repair loci. Functional assays such as ??-H2AX foci formation after genotoxic stress and cell proliferation analyses further delineate BAZ1B’s contributions to DNA damage signaling and growth control. Co-immunoprecipitation experiments can probe altered interactions with partners like SMARCA5 or MYBBP1A. For additional specifications or to inquire about custom projects, please contact Ascent Research.
