The BAG5 Knockout HAP1 Polyclonal Cells are a CRISPR/Cas9-edited polyclonal knockout cell population in which the BAG5 gene has been disrupted to eliminate functional BAG5 expression. This product provides a heterogeneous pool of HAP1 cells carrying a variety of knockout alleles, generated without single-cell cloning, thereby representing a gene-edited polyclonal knockout model. As a polyclonal population, these cells are ideal for studying loss-of-function effects at the population level while maintaining genetic diversity across the pool. The knockout avoids the biases of clonal selection and allows robust interrogation of BAG5-dependent phenotypes in a near-haploid genetic background.
The HAP1 host cell line is a near-haploid, adherent, fibroblast-like cell line derived from the KBM-7 chronic myeloid leukemia line. Its haploid karyotype simplifies CRISPR-mediated knockout since only one allele needs to be disrupted to produce a null phenotype, making it a powerful system for functional genomics and CRISPR-based genetic screens. HAP1 cells grow in culture as a monolayer with fibroblast-like morphology, exhibit stable growth kinetics, and are widely adopted for pathway dissection, drug sensitivity profiling, and protein interaction studies. Their haploid state minimizes genetic redundancy, enabling clearer genotype-phenotype correlations for targeted gene perturbations.
BAG5 encodes a cochaperone that negatively regulates the Hsp70/Hsc70 chaperone system by directly binding to these heat shock proteins and inhibiting their ATP-dependent protein refolding activity. Through this interaction, BAG5 promotes the ubiquitin-proteasome system-mediated degradation of misfolded or damaged proteins. BAG5 also interacts with the E3 ubiquitin ligase parkin and modulates parkin-dependent mitophagy, linking chaperone function to mitochondrial quality control. Upstream of BAG5, proteotoxic stress and proteasome inhibition can activate HSF1, which transcriptionally upregulates BAG5 expression. Together with Hsp70, Hsc70, parkin, and proteasome subunits, BAG5 integrates cellular responses to protein misfolding and mitochondrial damage.
In the HAP1 cell background, BAG5 knockout creates a model to dissect how loss of chaperone inhibition shifts the balance between protein refolding and degradation. Since HAP1 cells are haploid, the complete disruption of BAG5 generates a clean loss-of-function system for studying downstream effects on the Hsp70/Hsc70 axis and parkin-mediated mitophagy. These cells are particularly valuable for investigating the cellular consequences of impaired protein quality control under conditions of proteasome inhibition or oxidative stress, providing insight into the molecular pathology of Parkinson disease, where BAG5?Cparkin interactions are implicated in dopaminergic neuron survival.
These BAG5 knockout polyclonal HAP1 cells are suited for a wide range of experimental applications, including western blotting to verify loss of BAG5 protein, co-immunoprecipitation to assess interactions with Hsp70, Hsc70, or parkin, and proteasome activity or mitophagy assays to quantify functional changes. The model supports neurodegeneration research, Parkinson disease modeling, cancer biology studies, and drug sensitivity screening campaigns. Researchers can also use immunofluorescence or apoptosis assays to examine BAG5-dependent cytoprotective effects. For additional technical details or to inquire about this product, please contact Ascent Research.
