The ICE1 Knockout HEK293T Polyclonal Cells constitute a CRISPR/Cas9-edited polyclonal cell population derived from the HEK293T human embryonic kidney cell line, engineered to disrupt the ICE1 gene. This loss-of-function model enables detailed investigation of ICE1-dependent transcription elongation processes without introducing clonal bias, as the polyclonal format preserves the genetic heterogeneity of the knockout pool. The CRISPR/Cas9-mediated gene disruption targets the coding region of ICE1, generating a heterogeneous collection of cells with ablated ICE1 protein expression, suitable for functional genomics studies and pathway analysis.
HEK293T cells are a widely utilized host for biomedical research, originating from human embryonic kidney epithelium and immortalized through stable expression of the SV40 large T antigen. These adherent epithelial cells offer exceptional transfection efficiency and robust recombinant protein production, making them an ideal platform for loss-of-function studies. The HEK293T background provides a physiologically relevant context for examining transcription factor dynamics, as the cells retain active RNA polymerase II machinery and support the assembly of multi-subunit elongation complexes. Their rapid proliferation and well-characterized signaling networks further facilitate reproducible experimental outcomes.
The ICE1 gene encodes a transcription elongation factor that is an essential component of the little elongation complex (LEC). ICE1 interacts directly with the elongation factors ELL, EAF1, and EAF2, and together with ICE2 forms the LEC, which functions downstream of positive transcription elongation factor b (P-TEFb). This complex promotes processive elongation by RNA polymerase II at specific target loci, notably small nuclear RNA (snRNA) genes and select protein-coding genes. Through its scaffolding role, ICE1 facilitates efficient transcriptional elongation, and its disruption is predicted to impair LEC formation, leading to diminished expression of downstream targets and potential accumulation of stalled polymerases.
In the HEK293T context, ICE1 knockout disrupts the LEC, providing a model to dissect RNA polymerase II elongation mechanisms. The HEK293T cell line’s robust transcriptional activity and facile transfection allow for complementation studies and detailed interrogation of LEC assembly and function. Loss of ICE1 may alter snRNA biogenesis and global transcriptional programs, offering insights into cancer-associated transcriptional dysregulation. Additionally, this system can be used to assess cellular responses to elongation stress, including changes in proliferation and viability. The polyclonal nature captures diverse genetic disruptions, mimicking population-level heterogeneity.
These polyclonal knockout cells are compatible with a range of assays, including Western blotting for protein expression analysis, RT-qPCR and RNA-seq for transcriptomic profiling, ChIP-qPCR to map RNA polymerase II occupancy, and immunofluorescence for subcellular localization. Proliferation assays can evaluate phenotypic consequences. They support mechanistic studies of the LEC, snRNA gene regulation, and the role of ICE1 in transcriptional elongation. For additional information, contact Ascent Research.
