The KIF3A Knockout A-549 Polyclonal Cells represent a CRISPR/Cas9-edited polyclonal knockout cell population derived from the A-549 human lung adenocarcinoma cell line, carrying targeted disruption of the KIF3A gene. This polyclonal format maintains phenotypic heterogeneity and avoids clonal selection bias, providing a robust loss-of-function model for studying KIF3A-dependent processes. Loss of KIF3A motor function impairs anterograde transport along microtubules, offering researchers a versatile tool to dissect ciliary trafficking and signaling in a cancer cell background.
The A-549 cell line was originally established from the lung adenocarcinoma of a 58-year-old male and is widely employed as a model for non-small cell lung adenocarcinoma and respiratory epithelium. These adherent epithelial cells retain key characteristics of alveolar type II pneumocytes and are amenable to a range of functional assays, making them a reliable platform for investigating lung cancer biology, drug responses, and epithelial cell homeostasis.
KIF3A encodes a motor subunit of the heterotrimeric kinesin-II complex, which also includes KIF3B and the adaptor KAP3 (KIFAP3). This microtubule-based anterograde motor drives intraflagellar transport (IFT) within primary cilia by interacting with IFT complex A and IFT complex B particles, which contain components such as IFT140 and IFT88. KIF3A-mediated trafficking is essential for Hedgehog signaling: binding of the ligand SHH to the receptor PTCH1 relieves inhibition of the transmembrane protein SMO, which accumulates in the cilium and promotes activation of GLI transcription factors, including GLI1 and GLI2. KIF3A motor function facilitates the ciliary localization of SMO and GLI proteins, thereby enabling GLI-mediated transcriptional responses. Additionally, KIF3A influences Wnt signaling through ciliary recruitment of Wnt pathway components. Upstream regulators include RFX transcription factors and Hedgehog pathway activation. In knockout cells, disruption of KIF3A halts anterograde IFT, leading to defective ciliary assembly and attenuated downstream transcription.
In the context of A-549 lung adenocarcinoma cells, KIF3A knockout provides a powerful system to dissect cilia-dependent and -independent roles of the kinesin-II motor. Primary cilia are present on these cells and have been implicated in tumor growth and chemoresistance. Impairment of KIF3A disrupts GLI-dependent Hedgehog signaling, potentially altering proliferation, migration, and sensitivity to agents such as cisplatin. This polyclonal knockout model thus links defective ciliary transport to epithelial cancer phenotypes, offering insight into the contribution of primary cilia to lung tumor biology.
Applications of this knockout model include western blot analysis of KIF3A protein loss, RT-qPCR quantification of KIF3A mRNA levels, immunofluorescence staining with acetylated tubulin to assess ciliary integrity, GLI luciferase reporter assays to measure Hedgehog pathway activity, cell migration assays, and drug sensitivity profiling. These cells support investigation of primary cilia function in lung cancer, analysis of kinesin-mediated transport mechanisms, and exploration of cilia-associated drug resistance pathways. For additional product details or technical support, please contact Ascent Research.
