The DNAAF2 Knockout K-562 Polyclonal Cells are a CRISPR/Cas9-edited polyclonal knockout cell population derived from the K-562 human chronic myelogenous leukemia (CML) cell line, with targeted disruption of the DNAAF2 gene. This heterogeneous pool carries diverse loss-of-function mutations, providing a robust model to study dynein arm assembly factor function without clonal selection. The polyclonal format captures a spectrum of genomic edits, suitable for analyzing gene disruption phenotypes in a hematopoietic background through various molecular and functional assays.
The parental K-562 cell line, established from a CML patient in blast crisis, is BCR-ABL1-positive and widely used as a model for hematopoietic differentiation and leukemia research. These non-adherent, lymphoblast-like cells can undergo partial erythroid, granulocytic, and monocytic differentiation upon induction. The constitutive BCR-ABL1 kinase activity drives proliferation and survival, offering a well-characterized genetic context. Introducing DNAAF2 knockout into this leukemia model enables investigation of ciliary assembly factors in a non-ciliated cell type, potentially uncovering novel roles in hematopoiesis or leukemogenesis.
DNAAF2 encodes a cytoplasmic protein essential for pre-assembling outer dynein arm complexes, working with DNAAF1, DNAAF3, DNAAF4, and HSP90. This process is transcriptionally regulated by FOXJ1 and RFX transcription factors, master regulators of motile ciliogenesis. Downstream, DNAAF2 is critical for outer dynein arm formation and ciliary motility. Disruption of DNAAF2 leads to defective dynein arm assembly, impairing mucociliary clearance and left-right patterning. The pathway involves FOXJ1, DNAAF2, DNAAF1, DNAAF3, outer dynein arm, inner dynein arm, and the ciliary axoneme.
In K-562 cells, this knockout provides a unique platform to dissect dynein arm assembly independent of ciliogenesis. Although these cells do not form motile cilia, they express ciliary regulatory and structural components, especially during differentiation. This model is valuable for studying DNAAF2 protein interactions, stability, and post-translational modifications in a hematopoietic environment. The polyclonal heterogeneity mirrors the genetic diversity in primary ciliary dyskinesia patients, facilitating genotype-phenotype correlation studies and drug screening for dynein assembly rescue.
Applications include western blotting for dynein arm components, RT-qPCR for ciliary gene expression, and immunofluorescence for ciliary markers upon ciliogenesis induction. Co-culture or differentiation assays can assess impacts on hematopoietic lineages. Drug screening for ciliary defect modifiers and flow cytometry for hematopoietic markers are readily performed. This polyclonal knockout model is essential for primary ciliary dyskinesia, Kartagener syndrome, and motile cilia research. For more information, contact Ascent Research.
