The EIF4G3 Knockout SK-HEP-1 Polyclonal Cells are a CRISPR/Cas9-edited polyclonal population originating from the SK-HEP-1 human liver adenocarcinoma cell line, in which the EIF4G3 gene has been functionally disrupted. This loss-of-function model preserves the heterogeneous editing outcomes inherent to a polyclonal knockout pool, offering a robust cellular system to interrogate translation initiation mechanisms without clonal selection artifacts. The product is designed for researchers seeking to examine the consequences of EIF4G3 ablation on cap-dependent and IRES-mediated translation, mTOR signaling, and related pro-tumorigenic processes.
The SK-HEP-1 host cell line was originally derived from ascitic fluid of a patient with liver adenocarcinoma and is widely employed as a model for hepatocellular carcinoma metastasis and angiogenesis. Its phenotypic properties, including migratory and invasive capacity, combined with a well-characterized genomic landscape, make it particularly suitable for studies of tumor progression and translation-dependent oncogenic programs. The cells maintain characteristic epithelial morphology and are amenable to standard transfection and transduction protocols, facilitating downstream genetic or pharmacological manipulations.
EIF4G3 encodes a large scaffold protein that serves as the central organizing subunit of the eIF4F translation initiation complex, bridging the mRNA cap-binding protein eIF4E with the DEAD-box RNA helicase eIF4A and the multisubunit ribosome adaptor eIF3. The activity of EIF4G3 is tightly controlled by upstream signaling cascades; mTORC1-mediated phosphorylation of 4E-BP1 (EIF4EBP1) promotes eIF4E release and subsequent eIF4F assembly, while MNK1/2 directly phosphorylate EIF4G3 to modulate translation output. In turn, EIF4G3 drives the cap-dependent translation of key downstream oncoproteins such as MYC, CCND1, and BCL2, as well as viral IRES-driven translation during infection with enteroviruses or hepatitis C virus. The protein also interacts with poly(A)-binding protein PABPC1 to facilitate mRNA circularization and efficient ribosome recycling.
Disruption of EIF4G3 in SK-HEP-1 cells is predicted to uncouple eIF4F complex formation, attenuating global cap-dependent protein synthesis and selectively impairing the expression of pro-proliferative and anti-apoptotic factors that rely on strong translational regulation. Given the role of mTOR hyperactivation in hepatocellular carcinoma, this knockout model enables dissection of the specific contribution of the eIF4G3 isoform to oncogenic translation downstream of mTORC1, RPS6KB1, and EIF4EBP1, while potentially revealing compensatory functions of other eIF4G family members. The resulting reduction in tumor cell fitness provides a physiologically relevant context for target validation and drug screening efforts.
This polyclonal knockout product supports a broad array of experimental applications, including mechanistic studies of translation initiation, functional redundancy within the eIF4G family, and host dependency analyses for RNA viruses that rely on host translation machinery. The model is compatible with polysome profiling to assess ribosome loading, cap-bound mRNA quantitation by RT-qPCR, cap-dependent versus IRES luciferase reporter assays, and immunoprecipitation of eIF4F components. Additionally, the cells can be employed in viability, colony formation, and pharmacodynamic assays to evaluate translation-targeted therapeutics. For technical inquiries or customized services, please contact Ascent Research.
