The BAG3 Knockout HAP1 Polyclonal Cells represent a CRISPR/Cas9-edited polyclonal knockout cell population targeting the BAG3 gene in the near-haploid HAP1 cell line. This loss-of-function model enables dissection of BAG3-dependent processes without reliance on single-cell clones, offering a heterogeneous pool of knockout alleles.
HAP1 cells are derived from the KBM-7 chronic myeloid leukemia line and possess a near-haploid karyotype that facilitates efficient gene disruption. Their fibroblast-like morphology and intact signaling pathways relevant to cancer cell biology make them a robust platform for functional genomics. The haploid background ensures complete gene knockout upon biallelic targeting, minimizing compensatory wild-type expression and simplifying phenotypic analyses.
BAG3 encodes a stress-inducible co-chaperone that directly binds Hsp70 and HspB8, forming a complex with CHIP/STUB1 to mediate chaperone-assisted selective autophagy (CASA). It also interacts with SYNPO2 and the autophagic adaptor p62/SQSTM1 to couple misfolded proteins to the autophagy machinery. Upstream regulators include HSF1 and NF-??B, which activate BAG3 expression under proteotoxic stress, heat shock, and heavy metal exposure. BAG3 promotes autophagic flux by enhancing LC3 lipidation and simultaneously inhibits apoptosis through direct association with Bcl-2 and activation of the NF-??B and PI3K/AKT pathways. Additionally, BAG3 modulates MAPK/ERK signaling and Hippo pathway components, integrating protein quality control with cell survival and proliferation signals.
In the HAP1 background, complete BAG3 disruption provides an unambiguous model for studying the gene??s role in autophagy-dependent degradation and apoptosis regulation. Given the CML origin, these knockout cells are particularly suited for investigating BAG3 contributions to leukemia cell survival and drug resistance under proteotoxic load. The near-haploid nature allows clear genotype?Cphenotype correlations, enabling researchers to dissect the dependency of cancer cells on the CASA pathway and to identify synthetic lethal interactions with other proteostasis factors.
These cells are applicable to autophagy flux assays using LC3 turnover, aggresome formation analysis via immunofluorescence, and co-immunoprecipitation of Hsp70 complexes. Apoptosis can be assessed through caspase activity measurements, while cell viability under stress conditions reveals BAG3-dependent survival mechanisms. The polyclonal format supports studies of heterogeneous knockout responses, relevant to tumor biology. Furthermore, BAG3 knockout HAP1 cells serve as a null background for expressing disease-associated BAG3 variants in dilated cardiomyopathy and myofibrillar myopathy research. For further information, please contact Ascent Research.
