The DNAAF9 Knockout HeLa Polyclonal Cells product provides a CRISPR/Cas9-edited polyclonal knockout cell population derived from the HeLa cell line, carrying targeted disruption of the DNAAF9 gene. This model is designed for the functional analysis of DNAAF9, a cytoplasmic preassembly factor critical for axonemal dynein arm formation and ciliary motility. The polyclonal nature ensures a heterogeneous cell pool reflecting diverse editing outcomes, enabling robust population-level studies without clonal isolation, and is well suited for high-throughput screening assays.
The host HeLa cell line is an epithelial model derived from a human cervical adenocarcinoma, known for robust growth and amenability to genetic manipulation and imaging. Although not constitutively ciliated, HeLa cells can be induced to form primary cilia under serum starvation, providing a relevant platform for studying ciliogenesis and ciliary protein trafficking. The cervical epithelial origin also offers context for investigating links between ciliary dysfunction and cancer biology.
DNAAF9 encodes a cytoplasmic assembly factor that functions in the preassembly of axonemal dynein arms prior to their transport into cilia. It is transcriptionally regulated by ciliogenic transcription factors FOXJ1, RFX2, and RFX3, and directly interacts with other DNAAF family members (DNAAF1-6) to form a complex facilitating outer and inner dynein arm assembly. DNAAF9 is critical for the incorporation of dynein heavy chains (DNAH5), intermediate chains (DNAI1), and light intermediate chains (DNALI1) into functional dynein arms. Disruption of DNAAF9 leads to dynein arm preassembly failure, resulting in immotile cilia and impaired mucociliary clearance, a hallmark of primary ciliary dyskinesia.
In HeLa cells, DNAAF9 knockout offers a simplified model to dissect cytoplasmic dynein arm assembly, bypassing the complexity of multiciliated epithelia. Loss of DNAAF9 disrupts trafficking and assembly of axonemal dynein components, detectable by immunofluorescence for ciliary markers such as acetylated ??-tubulin and dynein arm subunits. These cells are valuable for studying primary ciliary dyskinesia, situs inversus, and chronic respiratory infections, all linked to ciliary motility defects. They also facilitate investigation of ciliary signaling pathways that may intersect with cancer cell proliferation and migration.
Researchers can employ DNAAF9 knockout HeLa polyclonal cells in a range of functional assays, including high-speed video microscopy for ciliary beat frequency quantification, transmission electron microscopy for axonemal ultrastructure analysis, and western blotting to assess dynein arm component expression. This knockout model is well suited for small-molecule screening to identify compounds that restore ciliary motility, genetic interaction studies, and hierarchical dissection of dynein arm assembly. For further details or custom project inquiries, please contact Ascent Research.
