The DNAL1 Knockout HT29 Polyclonal Cells represent a CRISPR/Cas9-edited polyclonal knockout cell population in which the DNAL1 gene has been disrupted via CRISPR/Cas9-mediated gene editing. This polyclonal population, derived from the HT29 human colorectal adenocarcinoma cell line, serves as a genetically defined loss-of-function model for investigating the roles of dynein axonemal light chain 1 in epithelial cell biology.
The HT29 cell line, originally isolated from a primary colorectal adenocarcinoma in a 44-year-old female, is a well-established model of human intestinal epithelium. HT29 cells are capable of undergoing differentiation into enterocyte-like phenotypes, exhibiting polarized monolayers, mucus production, and tight junction formation. These features render HT29 cells particularly valuable for studying epithelial barrier function, mucin secretion, and colorectal cancer progression.
DNAL1 encodes a light chain component of the axonemal outer dynein arm, a molecular motor essential for ciliary and flagellar motility. DNAL1 interacts with the dynein heavy chain DNAH5, intermediate chain DNAI1, and light chain DNALI1 within the axonemal dynein complex. Its expression is controlled by the transcription factors FOXJ1 and RFX3, which are activated by upstream Notch and Wnt signaling. DNAL1 inactivation impairs dynein complex assembly, reduces ciliary beat frequency, and consequently disrupts mucociliary clearance and Hedgehog signaling.
In the HT29 intestinal epithelial model, DNAL1 knockout permits investigation of ciliary dynein function in the context of epithelial differentiation, mucus production, and cancer-relevant signaling. HT29 cells can be differentiated into polarized monolayers that mimic the intestinal barrier and are capable of producing mucus, processes potentially influenced by the Notch, Wnt, and Hedgehog pathways crosstalk. Although HT29 are not constitutively ciliated, induction of ciliogenesis under air-liquid interface or specific media conditions allows functional assessment of ciliary motility deficits resulting from DNAL1 disruption.
This polyclonal knockout cell population is applicable to cilia biology, primary ciliary dyskinesia research, motility assays, and drug toxicity screening. Investigators can employ immunofluorescence of ciliary markers, high-speed video microscopy to measure ciliary beat frequency, western blotting for axonemal proteins, and RT-qPCR for ciliogenic transcription factors. Air-liquid interface culture enables evaluation of mucociliary clearance, complementing traditional 2D monolayer studies. Together, this model provides a versatile tool for elucidating the roles of axonemal dynein in epithelial homeostasis and disease. For additional details, contact Ascent Research.
