The DUSP19 Knockout HAP1 Polyclonal Cells constitute a CRISPR/Cas9-edited polyclonal knockout cell population originating from the HAP1 human near-haploid cell line, with targeted disruption of the DUSP19 gene locus. This product provides a reliable loss-of-function model for investigating dual-specificity phosphatase 19 (DUSP19), a pivotal negative regulator of stress-activated mitogen-activated protein kinase (MAPK) cascades. The polyclonal format comprises a heterogeneous pool of edited alleles, offering a robust and cost-effective system for functional genomics and pathway analysis without requiring single-cell cloning.
HAP1 is a human near-haploid cell line derived from KBM-7 chronic myeloid leukemia cells and notably lacks the Philadelphia chromosome. Its near-haploid karyotype, with a single copy of most genes, permits efficient and penetrant gene disruption, making it a powerful tool for haploid genetic screens. HAP1 cells retain functional signal transduction pathways, including apoptotic regulators such as p53, and exhibit consistent adherent growth, which supports reproducible cellular assays ranging from high-content imaging to biochemical analyses.
DUSP19 encodes a dual-specificity phosphatase that preferentially dephosphorylates the stress-activated kinases JNK1/2/3 and p38 MAPK, thereby dampening signals transmitted through the ASK1?CMKK4/7 kinase module. This enzyme interacts with JIP scaffold proteins to localize to JNK signaling complexes. Under conditions of UV irradiation, oxidative stress, or TNF-alpha stimulation, DUSP19-mediated dephosphorylation restrains JNK activity and limits the activation of downstream transcription factors such as c-Jun. Consequently, loss of DUSP19 abolishes this negative feedback, leading to persistent JNK phosphorylation and enhanced transcriptional responses that sensitize cells to stress-induced apoptosis.
Integration of the DUSP19 knockout into the HAP1 cell background generates a sensitized system for dissecting the molecular mechanisms of stress-induced apoptosis and MAPK pathway regulation. Because HAP1??s near-haploid genome ensures that a single disruptive allele can ablate protein function, the knockout yields a clear and penetrant phenotype. This model is particularly valuable for investigating how DUSP19 modulates the decision between cell survival and programmed cell death following genotoxic or inflammatory insults, and for conducting forward genetic or pharmacological screens aimed at nodes within the JNK/p38 signaling network.
This polyclonal knockout cell population supports a wide array of experimental applications, including functional genomics, MAPK signal transduction studies, apoptosis research, and drug sensitivity profiling. Standard assay readouts compatible with this model encompass western blotting for phospho-JNK, RT-qPCR for downstream target genes, Annexin V apoptosis assays, stress-induced viability measurements, AP-1 luciferase reporter assays, and transcriptomic analysis by RNA-seq. The polyclonal format facilitates scalable, cost-efficient experimentation, while the haploid background simplifies genomic integration screens. For further information, custom cell engineering, or technical assistance, please contact Ascent Research.
