The DNAAF9 Knockout HEK293T Polyclonal Cells are a CRISPR/Cas9-mediated gene-disrupted polyclonal population derived from the Homo sapiens HEK293T embryonic kidney epithelial cell line, targeting the DNAAF9 (dynein axonemal assembly factor 9, also known as CILD12) gene. DNAAF9 encodes a cytoplasmic factor essential for the pre-assembly of axonemal dynein arm complexes required for motile cilia function. The polyclonal product format provides a heterogeneous mixture of edited cells, enabling pooled loss-of-function studies without clonal isolation, and is well-suited for investigations where genetic diversity within the knockout population is informative.
HEK293T cells are a standard host for recombinant protein expression, stably harboring the SV40 large T-antigen to allow episomal plasmid replication and high-level protein production. Although they do not generate motile cilia, their human embryonic kidney epithelial origin and excellent transfectability make them a practical biochemical platform for analyzing ciliary protein expression, assembly, and interactions. Notably, under serum-free culture conditions, HEK293T cells can be induced to form primary cilia, permitting simplified studies of early ciliogenesis and the subcellular localization of dynein arm assembly factors including DNAAF9.
DNAAF9 functions in the cytoplasmic pre-assembly of dynein arm complexes, directly interacting with assembly factors such as DNAAF1, DNAAF2, DNAAF3, and coiled-coil domain-containing proteins CCDC103, CCDC39, and CCDC40, as well as outer dynein heavy chains DNAH5 and DNAH11. This network is transcriptionally regulated by FOXJ1 and RFX family master regulators of motile ciliogenesis, with additional modulation from Notch signaling and hypoxia-inducible factor HIF1A. DNAAF9-dependent assembly is essential for outer and inner dynein arm integrity, which governs ciliary beat frequency and mucociliary clearance; consequently, loss of DNAAF9 leads to immotile cilia and ciliopathic phenotypes such as primary ciliary dyskinesia.
Within the HEK293T cellular context, the DNAAF9 knockout model enables focused biochemical dissection of dynein arm assembly mechanisms, circumventing the complexity of multi-ciliated cell models. The host line??s high transfection efficiency and protein overexpression capacity facilitate rescue experiments to map critical functional domains of DNAAF9, as well as interaction studies using co-immunoprecipitation or proximity ligation assays. Induction of primary cilia under serum starvation further allows investigation of DNAAF9??s role in early ciliogenesis and the localization of its interaction partners, providing a reductionist yet informative system for studying assembly factor dynamics.
This polyclonal knockout cell population is intended for advanced research applications including the biochemical characterization of dynein arm assembly, high-content screening of small molecules that modulate DNAAF9 function or its interactome, and mechanistic modeling of primary ciliary dyskinesia and related conditions such as Kartagener syndrome. Compatible assays include western blotting for dynein proteins, RT-qPCR analysis of ciliogenesis-related gene expression, and immunofluorescence microscopy for DNAAF9 and its partners. Comparative phenotypic analyses between knockout and wild-type HEK293T cells under ciliogenic conditions can reveal functional deficits. For further information, protocol guidance, or custom inquiries, please contact Ascent Research.
