The DOCK7 Knockout NCI-H1975 Polyclonal Cells are a CRISPR/Cas9-edited polyclonal knockout cell population derived from the NCI-H1975 human lung adenocarcinoma line. These cells feature a disrupted DOCK7 locus, creating a loss-of-function model for studying the role of DOCK7 in cytoskeletal dynamics and cancer biology. As a polyclonal population, the cells encompass a heterogeneous mixture of edited alleles, reducing clonal bias and enhancing experimental robustness.
NCI-H1975 is a well-characterized non-small cell lung cancer (NSCLC) line harboring EGFR L858R and T790M mutations. These mutations lead to constitutive activation of EGFR signaling and are associated with resistance to EGFR tyrosine kinase inhibitors. The cell line is commonly used to investigate mechanisms of drug resistance, cell migration, and invasion in an epithelial background. Introducing DOCK7 knockout into this system permits dissection of EGFR-dependent cytoskeletal remodeling pathways.
DOCK7 functions as a guanine nucleotide exchange factor (GEF) for the small GTPases Rac1 and Cdc42. Activated by upstream stimuli such as EGF and PDGF or integrin engagement, DOCK7 promotes GDP-to-GTP exchange, generating Rac1-GTP and Cdc42-GTP. These active GTPases then signal through effectors including PAK and LIMK, leading to cofilin phosphorylation and actin polymerization. DOCK7 also interacts with ELMO proteins and microtubules, integrating multiple signal inputs. Key pathway components linking EGFR to actin dynamics include PI3K, Rac1, PAK, LIMK, and cofilin.
In EGFR-mutant lung adenocarcinoma, DOCK7-driven cytoskeletal regulation may contribute to enhanced cell migration, invasion, and metastatic potential. Loss of DOCK7 in NCI-H1975 cells is expected to impair Rac1/Cdc42 activation, reduce actin remodeling, and attenuate invasive behaviors. This model also provides a tractable system to study how EGFR signaling converges on DOCK7 to modulate focal adhesion dynamics and cell polarity. Although DOCK7 is associated with neurodevelopmental disorders, its role in cancer can be precisely interrogated using this engineered cell population.
Researchers can apply this knockout model in diverse assays to assess cell motility, cytoskeletal organization, and signal transduction. Typical experiments include wound-healing migration assays, transwell invasion assays, phalloidin staining for F-actin, and immunofluorescence for focal adhesion markers. Biochemical approaches such as Rac1/Cdc42 activity pull-downs and western blotting for phospho-PAK and phospho-cofilin quantify signaling changes. RT-qPCR analysis confirms DOCK7 transcript disruption. These cells are also suitable for drug sensitivity screens and co-culture studies. For more information, please contact Ascent Research.
