The DTX3L Knockout HeLa Polyclonal Cells constitute a heterogeneous CRISPR/Cas9-edited polyclonal population derived from the HeLa cervical adenocarcinoma cell line, featuring targeted disruption of the DTX3L gene. This polyclonal knockout model provides a versatile loss-of-function system for studying the biological roles of DTX3L across a diverse cell pool without the limitations associated with single-cell clonal selection. The use of CRISPR/Cas9-mediated gene disruption ensures efficient abrogation of DTX3L protein expression, enabling robust interrogation of its functions in innate immunity, DNA damage signaling, and ubiquitin-dependent regulation.
HeLa cells, an immortalized line originally isolated from a human cervical adenocarcinoma, serve as a classic epithelial model extensively employed in cancer research, drug discovery, and cell biology. These cells retain key signaling pathways, including interferon (IFN) responsiveness and DNA damage repair mechanisms, making them an appropriate host for investigating DTX3L function. Their adherent growth, stable karyotype, and well-characterized molecular landscape facilitate a wide range of downstream assays from biochemical analysis to high-content imaging.
DTX3L encodes an interferon-inducible E3 ubiquitin-protein ligase that functions in tight association with PARP9 to catalyze ubiquitination of histone H2A and other substrates, thereby modulating chromatin structure and transcriptional programs. Upon IFN-??/??/?? stimulation, upstream activators trigger JAK1/2-mediated phosphorylation of STAT1 and STAT2, which together with IRF9 form the ISGF3 complex that transcriptionally induces DTX3L expression. NF-??B signaling, regulated by IKBKB and RELA, also contributes to DTX3L upregulation. DTX3L subsequently interacts with STAT1, PARP9, and ubiquitin-conjugating E2 enzymes to govern downstream events, including STAT1-dependent ISG expression, DNA repair protein dynamics, and histone ubiquitination, positioning it as a critical node at the intersection of immune signaling and genome stability.
In the HeLa cervical cancer background, DTX3L knockout disrupts these interconnected pathways, altering the ubiquitination landscape and impairing proper regulation of innate immune responses and DNA damage resolution. HeLa cells exhibit functional NF-??B and interferon signaling, and loss of DTX3L can compromise ISG induction (e.g., ISG15, IFIT1) following IFN stimulation, as well as affect the formation of ??-H2AX foci in response to genotoxic stress. This polyclonal knockout pool thus enables dissection of DTX3L??s contributions to cancer cell proliferation, inflammation control, and the coordination between ubiquitination and transcriptional regulation without clonal selection bias.
This knockout model is ideally suited for detailed mechanistic studies employing a variety of experimental techniques. Researchers can analyze interferon signaling dynamics through IFN stimulation assays followed by RT-qPCR or RNA-seq to profile ISG expression changes, or investigate protein?Cprotein interactions via co-immunoprecipitation of the DTX3L?CPARP9?CSTAT1 complex. Ubiquitination assays permit direct assessment of histone H2A modification, while flow cytometry enables cell cycle and apoptosis analyses following DNA damage induction. Additional applications include immunofluorescence imaging of repair foci and chemical genetic screens targeting the ubiquitin-proteasome system. For further information, please contact Ascent Research.
