The DUS3L Knockout HEK293T Polyclonal Cells consist of a polyclonal pool of HEK293T cells in which CRISPR/Cas9 has been employed to disrupt the DUS3L gene, generating a heterogeneous knockout population. This format avoids clonal expansion biases and preserves the diversity of editing outcomes, making it ideal for pooled genetic screens, dose-response studies, and high-throughput functional assays where reproducibility and representation of multiple knockout alleles are advantageous.
The HEK293T host cell line is a well-characterized human embryonic kidney epithelial line that constitutively expresses the SV40 large T antigen. Transformed with sheared adenovirus 5 DNA, these cells are renowned for their exceptional transfectability, high-level recombinant protein synthesis, and capacity to produce lentiviral and retroviral vectors at high titers. Their rapid proliferation and ease of maintenance have made them a staple in molecular biology, virology, and drug discovery research.
DUS3L belongs to the dihydrouridine synthase family and catalyzes the NADPH-dependent reduction of uridine to dihydrouridine at specific positions in the D-loop of tRNA. This post-transcriptional modification increases tRNA conformational flexibility and thermal stability, thereby fine-tuning ribosomal A-site decoding and elongation rates. DUS3L activity is regulated upstream by the RNA polymerase III transcription machinery and the nutrient-sensitive repressor MAF1, which coordinates tRNA gene transcription with cellular metabolic state. DUS3L physically engages tRNA substrates and functionally cooperates with other tRNA-modifying enzymes and translation elongation factors. Knockout of DUS3L results in tRNA hypomodification, leading to altered codon:anticodon pairing, ribosomal pausing, and proteotoxic stress??a condition that can perturb global protein homeostasis and activate stress response pathways.
In the context of HEK293T cells, which sustain a high translational load for constitutive protein expression and viral particle assembly, loss of DUS3L-dependent dihydrouridine modification is anticipated to exacerbate translational errors and impair proteostasis. This model therefore provides a genetically tractable system for dissecting how tRNA modification defects contribute to the etiology of neurodevelopmental disorders, intellectual disability, developmental delay, and cancer. The polyclonal knockout cells are particularly useful for exploring genotype-phenotype relationships and for conducting modifier screens to identify genetic or pharmacological interventions that restore normal translation.
Researchers can apply these cells in diverse experimental paradigms: assessing tRNA modification profiles by AlkB-facilitated tRNA sequencing or liquid chromatography-tandem mass spectrometry (LC-MS/MS) for dihydrouridine; quantifying translation fidelity via ribosome profiling and puromycin incorporation assays; and monitoring protein expression changes through western blotting, RT-qPCR, and immunofluorescence. Cell viability and stress response assays further enable functional characterization. The model supports mechanism-driven studies of tRNA biology, disease modeling, and the development of tRNA-based therapeutics. For further details, please contact Ascent Research.
