The BLOC1S3 Knockout HAP1 Polyclonal Cells product comprises a CRISPR/Cas9-edited polyclonal knockout cell population in the HAP1 cell line, targeting the BLOC1S3 gene. This gene disruption model is designed for functional studies of BLOC1S3, a critical subunit of the biogenesis of lysosome-related organelles complex-1 (BLOC-1). The polyclonal format provides a heterogeneous pool of edited cells, enabling robust assessment of BLOC1S3 loss-of-function in relevant biological contexts.
HAP1 cells are a near-haploid human cell line derived from the KBM-7 chronic myeloid leukemia (CML) model. Their near-haploid karyotype makes them particularly valuable for genetic screening and loss-of-function studies, as only one allele needs to be disrupted to achieve a functional knockout. HAP1 cells retain many characteristics of the original leukemia, serving as a relevant context for cancer cell biology and intracellular trafficking investigations.
BLOC1S3 encodes a core component of the BLOC-1 complex, which orchestrates vesicle trafficking from early endosomes to lysosome-related organelles. The BLOC-1 complex, including subunits BLOC1S1, BLOC1S2, pallidin, muted, snapin, and cappuccino, interacts with the AP-3 complex and the kinesin motor KIF13A to regulate cargo sorting. BLOC1S3 is transcriptionally activated by MITF, TFEB, and TFE3, and functions downstream to promote trafficking of melanosomal proteins such as TYRP1 and TYR, as well as lysosomal enzymes. Disruption of BLOC1S3 impairs the biogenesis of melanosomes, platelet dense granules, and other lysosome-related organelles, linking it to vesicle-mediated transport and organelle maturation.
In the HAP1 near-haploid background, loss of BLOC1S3 creates a powerful model for studying lysosome-related organelle biogenesis and associated disease mechanisms. The knockout recapitulates cellular defects seen in Hermansky-Pudlak syndrome type 8, oculocutaneous albinism, and platelet dense granule deficiency. HAP1 cells?? compatibility with haploid genetic screens allows for systematic interrogation of genetic interactions and signaling pathways that converge on BLOC-1-dependent trafficking, offering a versatile platform for drug target discovery and pathway dissection.
Researchers can employ this knockout model in a variety of experimental paradigms, including western blotting to confirm loss of BLOC1S3 expression, immunofluorescence to visualize organelle morphology, and Lysotracker assays to assess lysosomal function. Co-immunoprecipitation and RNA-seq can be leveraged to map protein interaction networks and global transcriptional changes resulting from BLOC-1 disruption. Functional vesicle trafficking assays and differentiation into melanocytic or megakaryocytic lineages further enable studies of melanosome maturation and platelet dense granule formation. For additional technical information or to explore related products, please contact Ascent Research.
