The DNMBP Knockout HT29 Polyclonal Cells represent a CRISPR/Cas9-edited polyclonal population of HT29 human colorectal adenocarcinoma cells with targeted disruption of the DNMBP gene. This polyclonal knockout model provides a heterogeneous pool of edited cells, enabling robust functional studies of DNMBP (also known as Tuba) in a physiologically relevant intestinal epithelial background. The product is designed to facilitate investigation of DNMBP-dependent pathways without the confounding effects of clone-specific artifacts, offering a representative loss-of-function system for epithelial cell biology and cancer research.
The host HT29 cell line is a widely utilized model derived from a primary colorectal adenocarcinoma of a 44-year-old female. HT29 cells exhibit an adherent epithelial-like morphology and are characterized by mutations in the tumor suppressor genes APC and TP53, along with microsatellite instability (MSI-positive). Under appropriate culture conditions, these cells possess the capacity to undergo enterocytic differentiation and produce mucus, recapitulating key features of intestinal epithelial biology. Consequently, HT29 serves as a versatile platform for studying colon cancer pathogenesis, epithelial barrier function, and cellular differentiation mechanisms.
DNMBP functions as a critical scaffold protein that integrates Cdc42 signaling with actin cytoskeleton remodeling, tight junction assembly, and endocytic pathways. Mechanistically, DNMBP is activated by GTP-bound CDC42 and RAC1 downstream of receptor tyrosine kinases such as EGFR, as well as the polarity protein PARD3. Upon activation, DNMBP engages the N-WASP (WASL) and ACTR2/3 complex to promote localized actin polymerization at nascent tight junctions, facilitating recruitment of junctional components including TJP1 (ZO-1) and OCLN (occludin). Additionally, DNMBP coordinates dynamin-2 (DNM2)-mediated endocytosis through interactions with F-actin and ARF6, thereby modulating membrane trafficking and junctional remodeling. This scaffolding function positions DNMBP as a central node in the regulation of epithelial polarity and barrier integrity.
In the context of HT29 colorectal adenocarcinoma cells, disruption of DNMBP expression is expected to perturb the intricate balance between actin dynamics, tight junction stability, and endocytic turnover that underpins epithelial morphogenesis and barrier function. Given the established roles of DNMBP in polarity and adhesion, this knockout model is particularly relevant for dissecting mechanisms of colorectal cancer progression, metastasis, and epithelial?Cmesenchymal transition. Moreover, the HT29 background, with its dysfunctional APC and TP53 pathways, mimics genetic alterations frequently observed in sporadic colorectal tumors, enhancing the translational relevance of studies employing this polyclonal knockout population.
Researchers can leverage DNMBP Knockout HT29 Polyclonal Cells to interrogate tight junction dynamics via immunostaining for TJP1 and OCLN, assess barrier function by transepithelial electrical resistance (TEER) measurements, and visualize F-actin reorganization using phalloidin staining. The polyclonal knockout model is also suited for migration/invasion assays, co-immunoprecipitation of interacting partners, and endocytosis uptake analysis to delineate DNMBP??s role in membrane trafficking. Transcriptomic profiling by RNA-seq can further elucidate downstream gene expression changes. For additional details or inquiries, please contact Ascent Research.
