The KIF3B Knockout NCI-H1975 Polyclonal Cells represent a CRISPR/Cas9-edited polyclonal knockout cell population derived from the NCI-H1975 human lung adenocarcinoma cell line. This product provides a heterogeneous population of cells with targeted disruption of the KIF3B gene, enabling loss-of-function studies of this critical kinesin motor protein. The polyclonal format offers a pooled knockout model that captures the diversity of editing outcomes, making it suitable for screening and pathway analysis without clonal selection bias.
The parental NCI-H1975 cell line is an established model of non-small cell lung cancer (NSCLC), originally isolated from a female patient with lung adenocarcinoma. These cells harbor activating EGFR L858R and resistance-conferring T790M mutations, rendering them resistant to first- and second-generation EGFR tyrosine kinase inhibitors (TKIs). This genetic background makes NCI-H1975 a valuable tool for studying mechanisms of acquired drug resistance and for developing next-generation therapeutic strategies against NSCLC.
KIF3B encodes a core subunit of the heterotrimeric kinesin-2 motor complex, which drives anterograde intraflagellar transport (IFT) and is indispensable for primary cilium assembly and function. Within the cilium, KIF3B interacts with KIF3A and KIFAP3 to form the motor domain, and it collaborates with IFT88 and dynactin to transport cargo along the axonemal microtubules. This process is essential for the proper trafficking of signaling molecules, directly impacting the Hedgehog pathway by facilitating the proteolytic processing and nuclear translocation of GLI transcription factors downstream of the SMO receptor and the PTCH1 suppressor. KIF3B expression is transcriptionally regulated by RFX transcription factors and FOXJ1 in response to ciliogenesis stimuli. Beyond ciliary signaling, KIF3B contributes to mitotic spindle organization and interacts with spindle assembly checkpoint components, linking cilium disassembly to cell cycle progression. Key pathway mediators include SUFU, STIL, and PLK4, positioning KIF3B as a central node integrating ciliary signaling with mitotic regulation.
In the NSCLC context, loss of KIF3B abolishes primary cilium function, thereby disrupting Hedgehog-dependent gene expression and potentially altering the cell’s proliferative and survival signaling. Given that Hedgehog pathway activation has been associated with EGFR-TKI resistance in lung cancer, the KIF3B knockout in NCI-H1975 cells provides a means to investigate whether ciliary signaling contributes to the maintenance of the resistant state. This model can be used to explore synthetic lethal interactions and to identify vulnerabilities that may be exploited to overcome drug resistance.
Applications of these polyclonal knockout cells include cilium formation assays, immunofluorescence localization studies, western blotting for pathway components, RNA-seq profiling of transcriptomic changes, and drug sensitivity assays to assess chemoresistance. The model is also suitable for cell migration and proliferation assays, enabling functional dissection of KIF3B’s role in NSCLC progression. For further technical details or to request a consultation, contact Ascent Research.
