BLOC1S2 Knockout HAP1 Polyclonal Cells are a CRISPR/Cas9-mediated gene-disrupted polyclonal cell pool designed for loss-of-function studies of BLOC1S2. This heterogeneous population of HAP1 cells carries targeted disruption of the BLOC1S2 gene, enabling analysis of BLOC-1 complex function in lysosome-related organelle biogenesis and endosomal trafficking without clonal isolation. The polyclonal format offers a robust and representative model for investigating cargo sorting and organelle maturation, recapitulating the heterogeneity of cellular responses.
HAP1 is a near-haploid human chronic myeloid leukemia cell line derived from KBM-7. Its haploid genome simplifies gene editing, as disruption of a single allele yields functional knockout. Widely used for gene function studies, HAP1 cells provide a leukemic myeloid context well-suited for investigating membrane trafficking and organelle biogenesis. The line’s ease of genetic manipulation and well-characterized signaling networks enhance its utility for knockout-based research.
BLOC1S2 encodes a subunit of the BLOC-1 complex, which mediates endosomal sorting of cargo destined for lysosome-related organelles like melanosomes and platelet dense granules. BLOC1S2 interacts with other BLOC-1 subunits, the AP-3 adaptor, and BLOC-2/3 complexes. Upstream regulation by MITF controls BLOC-1 expression. Downstream, BLOC1S2-dependent sorting targets include melanosomal enzymes (TYR, TYRP1, DCT) and dense granule cargo (serotonin, ADP, calcium). Disruption of BLOC1S2 impairs these processes, linking to Hermansky-Pudlak syndrome pathology.
In HAP1 cells, BLOC1S2 knockout creates a loss-of-function model for Hermansky-Pudlak syndrome, oculocutaneous albinism, and platelet storage pool deficiency. The haploid background facilitates unambiguous genotype-phenotype correlations, enabling high-throughput genetic and pharmacological screens. Researchers can use this model to investigate how BLOC-1 complex dysfunction leads to impaired melanosome maturation and deficient platelet dense granule formation, recapitulating key features of these disorders.
This cell pool supports a range of assays, including western blotting for BLOC1S2, immunofluorescence for lysosomal markers (LAMP1, LAMP2), and endocytic trafficking assays. Co-immunoprecipitation assesses BLOC-1 complex integrity, while RNA-seq profiles transcriptomic changes. Platelet dense granule staining provides functional readouts. Applications include disease modeling, drug screening for trafficking disorders, and organelle biogenesis studies. Contact Ascent Research for details.
