BAZ1A Knockout HAP1 Polyclonal Cells are a CRISPR/Cas9-edited polyclonal knockout cell population derived from the HAP1 haploid human cell line, providing a powerful loss-of-function model for studying the bromodomain adjacent to zinc finger domain 1A (BAZ1A) protein. This gene-edited product contains a heterogeneous pool of cells with target-gene disruption, enabling the investigation of BAZ1A??s essential functions in chromatin dynamics, DNA replication, and genome maintenance. The polyclonal format facilitates robust phenotypic screening without the artifacts that may arise from clonal selection, making it particularly suitable for functional genomics studies where population-level effects are desired.
HAP1 cells are a near-haploid human cell line originally derived from the KBM-7 chronic myeloid leukemia (CML) line, characterized by a stable haploid karyotype that allows efficient gene disruption and unambiguous genotype?Cphenotype correlations. Because only one copy of most genes is present, CRISPR/Cas9-mediated editing frequently generates loss-of-function alleles, and the absence of a second allele simplifies functional interpretation. This host cell model is widely employed in genetic screens, pathway analysis, and drug target validation across diverse areas including cancer biology and signal transduction.
BAZ1A encodes a core subunit of the ATP-utilizing chromatin assembly and remodeling factor (ACRF) complexes, specifically the ACF and WICH complexes, which utilize the SMARCA5/SNF2H ATPase to slide nucleosomes along DNA. Through these complexes, BAZ1A regulates nucleosome positioning at replication forks, promoters, and DNA damage sites, thereby facilitating DNA replication, transcription, and repair. BAZ1A function is activated downstream of ATM/ATR kinases in the DNA damage response and is transcriptionally regulated by E2F transcription factors during cell cycle entry. It physically interacts with PCNA, linking chromatin remodeling directly to the replication machinery, and cooperates with DNA repair factors to promote ??H2AX foci formation and efficient lesion processing.
Disruption of BAZ1A in the HAP1 haploid background leads to impaired chromatin remodeling, which manifests as defective cell cycle progression and heightened sensitivity to genotoxic stress. Because HAP1 cells retain many features of transformed myeloid cells, BAZ1A knockout in this context serves as a relevant model for investigating chromatin-associated vulnerabilities in leukemia and other cancers with genomic instability. The interplay between BAZ1A loss and the p53-deficient background of HAP1 cells further accentuates DNA damage checkpoint deficiencies, providing a clean system to dissect BAZ1A-dependent repair pathways.
This knockout cell model supports a wide range of experimental applications, including chromatin immunoprecipitation followed by qPCR (ChIP-qPCR) to assess nucleosome occupancy, immunofluorescence localization of DNA repair proteins, and western blotting to monitor downstream signaling events such as ??H2AX phosphorylation. Functional assays like comet assays can quantify DNA break accumulation, while flow cytometry reveals cell cycle alterations. Transcriptomic profiling via RNA-seq or targeted RT-qPCR can identify BAZ1A-dependent gene expression changes. These cells are particularly valuable for screens identifying synthetic lethal interactions in cancer and for mechanistic studies of epigenetic regulation. For further information, please contact Ascent Research.
