The EFCAB7 Knockout HeLa Polyclonal Cells product consists of a CRISPR/Cas9-edited polyclonal knockout population of HeLa cells, designed to abrogate functional expression of the EFCAB7 gene. This heterogeneous pool provides a robust loss-of-function model for investigating EFCAB7, an EF-hand calcium-binding protein that serves as a subunit of the nexin-dynein regulatory complex (N-DRC) in cilia and flagella. By eliminating endogenous EFCAB7, researchers can dissect its contributions to ciliary motility, calcium-dependent regulatory mechanisms, and associated pathways without the need for clonal isolation. The polyclonal format ensures broad applicability across various cell biology assays while maintaining genetic diversity.
HeLa cells, originated from a human cervical adenocarcinoma in 1951, are a cornerstone of biomedical research due to their immortalized growth, ease of culture, and extensive characterization. These adherent epithelial cells have been pivotal in studies of cancer biology, virology, and signal transduction. Although normally non-ciliated, HeLa cells can be induced to form primary cilia upon serum withdrawal, providing an experimentally tractable system for studying ciliary proteins like EFCAB7 in a cancer cell background. This inducible ciliogenesis makes HeLa a suitable host for dissecting ciliary assembly and function.
EFCAB7 encodes an evolutionarily conserved EF-hand domain-containing protein that localizes to ciliary axonemes, where it functions as a core N-DRC component. The N-DRC connects outer doublet microtubules and coordinates dynein arm activity to generate ciliary bending. EFCAB7 interacts directly with other DRC subunits (DRC1?CDRC7), radial spoke head proteins, and dynein heavy chains. Its EF-hand motifs likely bind calcium, triggering conformational changes that modulate dynein-driven microtubule sliding and beat frequency. Transcriptionally, EFCAB7 expression is controlled by ciliogenic factors such as RFX2, RFX3, and FOXJ1, which regulate ciliary gene programs. Downstream, N-DRC function influences inner and outer dynein arms and, through ciliary integrity, can impact Hedgehog signaling.
In the HeLa context, EFCAB7 knockout cells offer a clean platform to study N-DRC assembly and calcium-sensitive motility regulation. Inducible ciliogenesis enables temporal analyses of complex formation and functional assays without interference from wild-type protein. The cancer background may also facilitate exploration of any non-ciliary roles of EFCAB7. As a polyclonal pool, these cells reduce clonal bias and more accurately represent population-level responses, enhancing reproducibility in studies requiring large numbers of cells.
These knockout cells support diverse applications: immunofluorescence microscopy of ciliary markers following serum starvation, co-immunoprecipitation to map N-DRC interactions, Western blotting and qRT-PCR for expression validation, calcium imaging to assess EF-hand functionality, and ciliary motility assays using high-speed video microscopy. The model is valuable for investigating ciliopathies like primary ciliary dyskinesia and for elucidating calcium signaling in ciliary contexts. For product inquiries or a quotation, please contact Ascent Research.
