The GSPT2 Knockout HT29 Polyclonal Cells represent a CRISPR/Cas9-edited polyclonal knockout cell population targeting the human GSPT2 gene in the HT29 colorectal adenocarcinoma background. This product comprises a heterogeneous pool of cells harboring targeted disruptions at the GSPT2 locus, creating a loss-of-function model that avoids clonal selection artifacts. The polyclonal format ensures that the resulting phenotype reflects an average of diverse editing events across the population, making it suitable for robust functional genomic screens and pathway studies.
HT29 cells are a well-established adherent epithelial cell line derived from a human colorectal adenocarcinoma. These cells retain key molecular and phenotypic characteristics of intestinal epithelium and colorectal cancer, including rapid proliferation and the ability to form polarized monolayers. They serve as a versatile platform for investigating oncogenic signaling, drug responses, and cellular metabolism, providing a clinically relevant context for dissecting the tumor-suppressive or oncogenic roles of translation-related genes.
The GSPT2 gene encodes eRF3b, a translational GTPase that functions as an essential component of the translation termination complex. eRF3b directly interacts with eRF1 (ETF1) to form a heterodimer that recognizes stop codons positioned at the ribosomal A-site. Upon stop-codon recognition, eRF3b hydrolyzes GTP, facilitating eRF1-mediated hydrolysis of the peptidyl-tRNA bond and subsequent release of the nascent polypeptide. This activity is regulated by upstream inputs such as mTOR signaling, cellular stress conditions, and eRF1 availability. Additionally, eRF3b associates with ribosomes, PABPC1, and the eIF3 complex, linking translation termination to ribosome recycling and global protein synthesis. Disruption of GSPT2 is predicted to impair termination efficiency, potentially activating nonsense-mediated mRNA decay pathways and dysregulating protein expression.
In the HT29 model, loss of GSPT2 function is expected to perturb protein homeostasis, leading to altered cellular proliferation, apoptosis susceptibility, and stress responses characteristic of colorectal adenocarcinoma. This perturbation provides a unique tool to examine how defective translation termination influences oncogenic pathways and tumor cell fitness. Because eRF3b??s activity intersects with mTOR-driven growth signals, the knockout model can be exploited to investigate crosstalk between nutrient sensing and protein synthesis fidelity in cancer.
This polyclonal knockout product is well-suited for diverse research applications, including mechanistic studies of translation termination, ribosome profiling via RNA-seq, and drug target validation. Experimentally, it supports assays such as Western blotting for downstream protein markers, RT-qPCR to assess mRNA stability, flow cytometry for cell cycle distribution, and MTT or BrdU proliferation assays. Migration and invasion phenotypes can also be evaluated, offering insight into the role of GSPT2 in metastatic potential. For further information, please contact Ascent Research.
