The IFT74 Knockout A-549 Polyclonal Cells are a CRISPR/Cas9-edited polyclonal knockout population derived from the A-549 human lung adenocarcinoma epithelial cell line, engineered to disrupt the IFT74 gene. This loss-of-function model provides a heterogeneous pool of edited alleles, avoiding clonal selection bias, and enables robust functional studies in a cancer-relevant background without implying monoclonality or biallelic modification.
The A-549 cells constitute an adherent epithelial line originally isolated from type II alveolar carcinoma, serving as a widely used model in respiratory disease research and oncology. These cells can form primary cilia under suitable conditions, making them ideal for dissecting ciliary assembly and function. Knocking out IFT74 in this context allows investigation of how ciliary defects modulate lung adenocarcinoma cell behaviors such as migration, proliferation, and therapeutic response.
IFT74 functions as a core subunit of anterograde intraflagellar transport complex B, interacting with motor protein KIF3A and complex B partners IFT20, IFT27, IFT52, and IFT88 to transport ciliary cargo along the axoneme. Its expression is driven by transcription factors FOXJ1, RFX2, and RFX3. IFT74 is essential for the ciliary localization of Hedgehog pathway components Smoothened and Patched, thereby enabling GLI transcription factor activation; its disruption impairs Hedgehog and Wnt signaling, highlighting its central role in ciliary signal coordination.
In the A-549 lung adenocarcinoma context, IFT74 loss profoundly compromises ciliogenesis, offering a model to explore cilia-dependent mechanisms in cancer. Since aberrant Hedgehog and Wnt pathways are implicated in lung cancer progression, these cells help elucidate how ciliary defects influence oncogenic signaling. Additionally, IFT74 mutations are associated with ciliopathies such as Meckel syndrome, Bardet-Biedl syndrome, Joubert syndrome, and skeletal dysplasias, extending the model’s relevance to studying ciliopathy-related phenotypes in an epithelial system.
Researchers can utilize these polyclonal cells in cilia formation assays visualized by immunofluorescence for acetylated tubulin and ARL13B, Hedgehog pathway reporter assays, RT-qPCR for downstream targets, and Western blotting for IFT74 protein. Functional migration and proliferation assays, combined with RNA-seq transcriptomic profiling, enable comprehensive analysis of IFT74-dependent networks. This product supports ciliopathy modeling, cancer biology investigations, and drug testing targeting ciliary signaling pathways. For additional information or technical support, please contact Ascent Research.
