The C12orf43 Knockout SK-HEP-1 Polyclonal Cells are a CRISPR/Cas9-edited polyclonal knockout population derived from SK-HEP-1 liver adenocarcinoma cells, targeting the C12orf43 gene (UTP23). C12orf43 encodes a nucleolar protein essential for pre-18S rRNA processing and 40S ribosomal subunit biogenesis within the small subunit processome. The polyclonal format provides a heterogeneous loss-of-function model suitable for robust ribosome biogenesis studies without clonal selection bias.
SK-HEP-1 is a widely utilized human hepatic adenocarcinoma cell line isolated from ascites, displaying epithelial morphology and tumorigenicity in mice. It serves as a standard model for liver cancer research and endothelial cell biology, offering a well-characterized system for functional genomic manipulation and cancer biology assays.
At the molecular level, C12orf43 functions as a core component of the small subunit processome, where it forms complexes with UTP18, UTP6, fibrillarin, and NOLC1 to mediate site-specific pre-18S rRNA cleavage. This processing step is rate-limiting for 40S ribosomal subunit maturation and is regulated by upstream signals including MYC transcriptional activity and mTORC1 kinase signaling, which integrate growth cues to modulate ribosome production. Disruption of C12orf43 thus uncouples rRNA processing from these anabolic pathways, leading to accumulation of unprocessed pre-18S intermediates, abortive 40S assembly, and nucleolar stress characterized by p53 stabilization and reduced translational output. Additional molecular players in the pathway include RNA polymerase I-driven rDNA transcription, the U3 snoRNA guiding early processing steps, and ribosomal protein genes downstream of mTORC1.
Within the SK-HEP-1 hepatocellular carcinoma background, C12orf43 ablation is predicted to compromise ribosome biogenesis, imposing nucleolar stress that can curtail cell proliferation and survival. This model provides a relevant platform for dissecting the dependency of liver cancer cells on augmented ribosome activity and for exploring the nexus between nucleolar dysfunction and oncogenic signaling. It is particularly suited for testing pharmacological agents that target ribosome biogenesis or the nucleolar stress response.
Typical applications include Western blotting and RT-qPCR for validation, immunofluorescence to assess nucleolar morphology, puromycin incorporation for translation measurement, and cell proliferation/apoptosis assays coupled with RNA-seq transcriptomic analysis. This polyclonal knockout system is valuable for functional genomics, drug target validation, and mechanistic inquiry into ribosome biogenesis in hepatic tumor biology. For further details, please contact Ascent Research.
