The HPS5 Knouckout HT29 Polyclonal Cells represent a CRISPR/Cas9-edited polyclonal knockout cell population in which the HPS5 gene has been disrupted via CRISPR/Cas9-mediated gene editing. This heterogeneous pool of targeted cells offers a rapid and cost-effective loss-of-function model for studying HPS5-dependent cellular processes without the need for single-cell cloning. The polyclonal format captures the natural diversity of editing outcomes, enabling robust phenotyping in a therapeutically relevant colorectal cancer background.
The host HT29 cell line is a well-characterized human colorectal adenocarcinoma epithelial model, derived from a primary tumor and exhibiting adherent growth. HT29 cells harbor mutations in the tumor suppressor genes APC and p53, which are common in colorectal cancer, and retain features of intestinal epithelial cells such as barrier formation, absorptive capacity, and regulated secretion. These characteristics make HT29 an ideal platform for investigating tumor cell biology, particularly pathways intersecting with endosomal trafficking and autophagy.
HPS5 encodes a subunit of the BLOC-2 complex, which partners with AP-3 to sort cargo from early endosomes to lysosome-related organelles. Regulated by TFEB and MITF, HPS5 interacts with HPS3, HPS6, Rab32, and Rab38 to mediate trafficking of melanosomal proteins such as TYRP1 and PMEL, and platelet dense granule components. Disruption of HPS5 impairs these processes, leading to defective organelle maturation linked to Hermansky-Pudlak syndrome type 5.
In the HT29 colorectal cancer context, HPS5 knockout provides a unique model to dissect the role of BLOC-2-dependent trafficking in malignant epithelial cells. Given HT29??s secretory phenotype and reliance on autophagy for survival under stress, loss of HPS5 can reveal contributions of lysosome-related organelle pathways to mucin secretion, autophagy flux, and endosomal sorting. This model enables the exploration of how defects in intracellular trafficking influence cancer cell homeostasis, offering insights into potential vulnerabilities linked to organelle biogenesis.
Researchers can employ this knockout model in diverse assays including Western blotting and RT-qPCR for HPS5 expression analysis, immunofluorescence staining of LAMP1/LAMP2 to assess lysosomal distribution, lysosomal pH measurements, LC3 turnover assays for autophagy flux, mucin secretion assays, and electron microscopy for dense-core vesicles. This polyclonal knockout population is a versatile tool for drug discovery and mechanistic studies of endo-lysosomal trafficking in cancer and Hermansky-Pudlak syndrome. For additional details or technical support, please contact Ascent Research.
