The BLOC1S3 Knockout SK-HEP-1 Polyclonal Cells are a CRISPR/Cas9-edited polyclonal knockout cell population designed to disrupt the BLOC1S3 gene in the human SK-HEP-1 cell line. This loss-of-function model enables investigation of BLOC1S3-dependent cellular processes without clonal selection, providing a heterogeneous population that reflects the knockout across a polyclonal background. The polyclonal format allows researchers to study gene disruption effects while mitigating clonal artifacts, making it suitable for functional genomics and pathway analysis.
The SK-HEP-1 cell line was originally derived from the ascites of a patient with liver adenocarcinoma and exhibits a unique dual phenotype expressing both endothelial and epithelial markers. This characteristic makes SK-HEP-1 a widely used model for liver sinusoidal endothelial cells and for studying tumorigenic epithelial cell behavior. The cells are adherent and display features relevant to hepatocarcinoma biology, including invasive and migratory capabilities, thus offering a platform to explore gene function in both endothelial and cancer contexts.
BLOC1S3 encodes a subunit of the biogenesis of lysosome-related organelles complex-1 (BLOC-1), essential for sorting endosomal cargo to lysosome-related organelles such as melanosomes and platelet dense granules. BLOC1S3 interacts with BLOC-1 components BLOC1S1, BLOC1S2, SNAPIN, and cooperates with the AP-3 complex and SNARE proteins like VAMP7. The complex is recruited to endosomes by upstream regulators Rab5 and phosphatidylinositol-3-phosphate (PI3P). Downstream, BLOC1S3 facilitates delivery of melanosomal proteins TYR and TYRP1, and platelet dense granule cargoes ADP and serotonin. Knockout disrupts trafficking, impairing organelle biogenesis, which is associated with Hermansky-Pudlak syndrome type 8, albinism, and platelet storage pool deficiency.
In the SK-HEP-1 background, BLOC1S3 knockout provides a unique tool to interrogate the intersection of endosomal trafficking, pigmentation biology, and liver cancer. Since SK-HEP-1 cells express both endothelial and epithelial markers, this knockout model enables studies on how lysosome-related organelle biogenesis influences liver sinusoidal endothelial function, tumor microenvironment interactions, and cancer cell migration. The polyclonal knockout population preserves the inherent heterogeneity of the parental line, allowing for assessment of BLOC1S3 loss on cell adhesion, invasion, and other metastatic traits, which are critical in adenocarcinoma progression.
This product supports a wide array of research applications, including investigation of Hermansky-Pudlak syndrome mechanisms, melanosome biogenesis, and platelet dense granule formation. Standard techniques like western blotting, immunofluorescence, and RT-qPCR confirm knockout and evaluate downstream targets. Functional assays such as endocytosis assays, melanosome quantification, and platelet aggregation studies assess trafficking defects. The SK-HEP-1 context also enables cancer biology studies, including migration and invasion assays. For further information, contact Ascent Research.
