The DUS4L Knockout HAP1 Polyclonal Cells represent a CRISPR/Cas9-edited polyclonal knockout cell population targeting the DUS4L gene in the near-haploid human HAP1 cell line. This loss-of-function model is designed for investigating the roles of dihydrouridine synthase 4-like (DUS4L) in mitochondrial tRNA modification and translation regulation. The polyclonal format provides a heterogeneous pool of edited cells, enabling robust functional studies without clonal selection biases.
HAP1 cells are a human near-haploid chronic myeloid leukemia (CML) cell line derived from the BCR-ABL-positive KBM-7 line. Exhibiting adherent, fibroblast-like morphology and a predominantly haploid karyotype, HAP1 cells are widely employed in genetic screening and homozygous mutation analysis. Their near-haploid nature facilitates straightforward disruption of single-copy genes, making them an ideal platform for CRISPR/Cas9-mediated knockout studies.
DUS4L encodes a mitochondrial enzyme that catalyzes the reduction of uridine to dihydrouridine in the D-loop of mitochondrial tRNAs, a modification critical for tRNA folding and translational fidelity. DUS4L functions within a network of dihydrouridine synthases, interacting with DUS1L and DUS2L, and is imported into mitochondria via the receptor TOMM20. Its activity is regulated by transcriptional regulators such as MYC, and its primary targets include mitochondrial tRNA substrates like tRNA(UUU). Disruption of DUS4L leads to loss of dihydrouridine modifications, resulting in impaired tRNA structure and compromised mitochondrial protein synthesis.
In the context of the HAP1 cell line, knockout of DUS4L creates a valuable model for dissecting mitochondrial tRNA processing and its impact on cellular physiology. The loss of dihydrouridine modification is expected to decrease translation accuracy and increase cellular stress, as evidenced by elevated reactive oxygen species (ROS) and apoptosis. This model is particularly relevant for studying diseases associated with tRNA modification defects, including cancer and neurological disorders, where mitochondrial dysfunction plays a key role.
The DUS4L knockout polyclonal cells are suitable for a wide range of functional assays, including LC-MS/MS detection of dihydrouridine levels, northern blotting to assess tRNA processing, polysome profiling for translation efficiency, and cell-based assays for proliferation, apoptosis, and ROS measurement. These tools facilitate detailed studies of mitochondrial gene expression, stress responses, and tRNA modification-linked diseases. For further technical information, please contact Ascent Research.
