The EFCAB7 Knockout A-549 Polyclonal Cells are a CRISPR/Cas9-edited polyclonal knockout cell population in which the EFCAB7 gene has been disrupted to create a loss-of-function model in the A-549 lung adenocarcinoma line. This product provides a heterogeneous pool of cells carrying diverse gene-editing events, ensuring robust target-gene disruption while preserving polyclonal genetic diversity. Such a format is advantageous for functional screening, pooled assays, and mechanistic studies that do not require clonal homogeneity.
The A-549 cell line, originally isolated from a 58-year-old Caucasian male with lung adenocarcinoma, exhibits characteristics of type II alveolar epithelial cells, including surfactant secretion and the ability to form polarized monolayers with tight junctions. Widely employed in cancer research, A-549 cells are a standard model for investigating epithelial barrier function, gas-exchange physiology, and calcium-dependent signaling pathways, making them a highly relevant host for studying EFCAB7 biology.
EFCAB7 is an EF-hand calcium-binding protein that functions as a sensor and transducer of intracellular calcium signals at the primary cilium. Upon calcium influx, EFCAB7 interacts with calmodulin and the ciliopathy-associated proteins IQCB1 and CEP290 to regulate ciliary axoneme assembly and stability. This interaction network links calcium homeostasis to Sonic hedgehog (Shh) signaling, where EFCAB7 acts downstream of Shh pathway activation. Mechanistically, EFCAB7 facilitates the calcium-dependent modulation of PKD2, which in turn influences GLI transcription factor processing, thereby controlling the expression of cell cycle regulators and ciliary components. Through these interactions, EFCAB7 integrates calcium and Shh cues to coordinate ciliary dynamics and proliferative signaling.
In the A-549 context, loss of EFCAB7 disrupts calcium-regulated ciliary signaling, leading to aberrant Shh pathway output and potential alterations in cell proliferation and migration??key hallmarks of lung adenocarcinoma. Primary cilia are increasingly recognized as tumor-suppressive organelles, and their dysfunction has been implicated in ciliopathies and cancer. This knockout model therefore provides a powerful tool to dissect cilia-dependent growth control and the role of calcium-Shh crosstalk in lung cancer progression, as well as to investigate EFCAB7-related ciliopathy mechanisms in a epithelial tumor background.
Researchers can employ this knockout model in calcium imaging experiments to monitor ciliary calcium fluxes, immunofluorescence staining for ciliary markers such as acetylated ??-tubulin or ARL13B, and western blotting to assess Shh pathway components (GLI1/2, PKD2) and cell cycle proteins. Functional assays, including scratch wound-healing and MTT proliferation assays, enable direct correlation of EFCAB7 loss with migration and growth phenotypes. The polyclonal format is particularly suitable for high-content screening, drug response profiling, and co-culture systems exploring tumor-stroma interactions. For product specifications and ordering information, please contact Ascent Research.
