BEND3 Knockout HAP1 Polyclonal Cells are a CRISPR/Cas9-edited polyclonal knockout cell population designed for loss-of-function studies of the human BEND3 gene. Engineered in the HAP1 host cell line, this product provides a heterogeneous pool of cells carrying targeted disruptions of BEND3, enabling functional analysis of the encoded protein. The CRISPR/Cas9-mediated gene disruption abrogates BEND3 expression, creating a versatile model for investigating its roles in transcriptional repression and heterochromatin biology. This polyclonal format ensures robust representation of knockout effects while maintaining population-level experimental consistency, suitable for assays that do not require clonal homogeneity.
HAP1 is a near-haploid human cell line derived from the chronic myeloid leukemia (CML) KBM-7 cell line. Originating from a male patient, it retains a near-haploid karyotype, with most chromosomes present in a single copy, which simplifies genetic manipulation and enhances the clarity of knockout phenotypes. HAP1 cells are widely employed as a model for haploid genetic screens and as a leukemia cell line, expressing many molecular pathways characteristic of hematopoietic malignancies. This background provides a physiologically relevant context for studying gene function in cancer, particularly epigenetic regulation, while enabling efficient CRISPR-based editing without the confounding effects of allele redundancy.
BEND3 encodes a BEN domain-containing transcriptional repressor that localizes to pericentromeric heterochromatin and nucleolar rDNA repeats. It directly interacts with the histone methyltransferase NSD1 and the nucleolar phosphoprotein NPM1, cooperating to establish repressive chromatin marks, including H3K27me3 and H4K20me3, and silence rRNA gene transcription. BEND3 function is regulated by upstream signals from the cell cycle machinery and other transcriptional regulators, and it acts downstream to repress rRNA genes and additional gene silencing targets. It also associates with components of the nucleolar remodeling complex (NoRC), further modulating heterochromatin maintenance. Through these interactions, BEND3 plays a critical role in maintaining genome stability and epigenetic silencing, with implications for cell growth control.
In the HAP1 background, BEND3 knockout provides a uniquely powerful system for dissecting heterochromatin organization and epigenetic silencing mechanisms. The near-haploid nature of the cell line allows unambiguous loss-of-function analysis and facilitates the identification of genetic interactions in haploid screens. Given the leukemic origin of HAP1 cells, this model is particularly suited to studying how BEND3-mediated gene silencing contributes to cancer epigenetics and pathogenesis of CML and other malignancies. Moreover, BEND3??s involvement in developmental disorders can be explored by examining its impact on chromatin states and gene expression programs in a hematological context, providing insights into broader epigenetic dysregulation.
This polyclonal knockout cell pool supports a wide range of experimental applications. Researchers can use ChIP-qPCR to quantify heterochromatin marks such as H3K9me3 at rDNA loci, RT-qPCR to assess derepression of rRNA genes, and immunofluorescence to monitor BEND3 protein localization. Transcriptome-wide effects can be evaluated by RNA-seq, while western blotting detects altered histone modifications or interacting partners like NSD1 and NPM1. Flow cytometry enables cell cycle analysis and proliferation assays. The polyclonal format is ideal for CRISPR-based positive selection screens and haploid genetic screens to uncover modifiers of BEND3-dependent silencing or synthetic lethal interactions. For additional information, please contact Ascent Research.
