The DCPH1 Knockout HAP1 Polyclonal Cells are a polyclonal population of HAP1 cells bearing CRISPR/Cas9-mediated disruption of the DCPH1 gene. This knockout model enables detailed investigation of mRNA decapping and 5??-3?? decay pathways in a near-haploid human background. The heterogeneous pool of DCPH1-disrupted alleles provides a robust loss-of-function system for studying post-transcriptional gene regulation, stress responses, and oncogenic processes without requiring clonal isolation.
HAP1 cells are a near-haploid human cell line derived from KBM-7 chronic myeloid leukemia cells, exhibiting fibroblast-like morphology. Their haploid karyotype, except for a disomic chromosome 8 region, facilitates unambiguous genotype-phenotype correlations and minimizes compensatory allelic effects. These features, combined with their leukemic origin, make HAP1 cells ideally suited for haploid genetic screens and cancer biology research.
DCPH1 acts as a scaffold in the mRNA decapping complex, interacting with DCP2, EDC3, DDX6, PAT1B, and the LSM1-7 complex to orchestrate 5?? cap removal and subsequent 5??-3?? degradation by XRN1; these assemblies concentrate in processing bodies (P-bodies). Its activity is modulated by stress signals and pathways such as mTORC1 and AKT, which regulate decapping of target mRNAs, particularly those with AU-rich elements. Through these mechanisms, DCPH1 couples environmental stimuli to rapid changes in gene expression.
In the near-haploid HAP1 background, DCPH1 disruption abolishes decapping complex integrity, enabling precise dissection of mRNA decay dynamics and P-body biology without wild-type allele interference. This model is particularly valuable for cancer research, as dysregulated mRNA turnover is linked to oncogenesis and drug resistance, and it allows examination of how mTORC1 and stress signals engage mRNA decay to control leukemic cell proliferation. Moreover, the haploid nature facilitates genetic screens to uncover dependency networks.
Typical applications include measuring mRNA half-life via RT-qPCR or RNA-seq following transcriptional arrest, imaging P-body dynamics by immunofluorescence, and performing luciferase reporter assays for transcript stability. The polyclonal population supports bulk decay analyses and can be used for haploid genetic screens to identify novel regulators of RNA turnover, for instance via RNA immunoprecipitation. Additionally, these cells are suitable for synthetic lethal screens and can be engineered to express reporters for live-cell imaging. For further information, contact Ascent Research.
