The CASZ1 Knockout AGS Polyclonal Cells comprise a CRISPR/Cas9-edited polyclonal knockout cell population targeting the CASZ1 gene in the AGS human gastric adenocarcinoma cell line. This polyclonal pool arises from a population of cells carrying heterogeneous disruptions of the CASZ1 locus, providing a loss-of-function model without clonal isolation. The resulting cell population enables robust investigation of CASZ1-dependent regulatory networks in a gastric cancer context.
AGS cells serve as a widely used epithelial model derived from a human stomach adenocarcinoma. They retain key features of gastric epithelium and are commonly employed to study gastric cancer biology, including proliferation, migration, and therapeutic response. Their adherent growth and well-characterized signaling profiles make them amenable to a variety of functional assays.
CASZ1 functions as a zinc finger transcription factor and tumor suppressor, primarily acting through transcriptional repression of cell cycle-promoting genes. Mechanistically, CASZ1 interacts with the corepressor REST and histone deacetylases HDAC1 and HDAC2 to form repressor complexes at target gene promoters. This complex directly downregulates downstream effectors such as INSM1, cyclin D1, and p21, thereby restraining cell cycle progression and maintaining differentiation. Upstream, CASZ1 expression is induced by Notch signaling and is negatively regulated by REST, establishing a feedback loop that fine-tunes developmental and homeostatic programs.
In the AGS gastric cancer background, CRISPR/Cas9-mediated ablation of CASZ1 disrupts the formation of functional CASZ1-REST-HDAC repressor complexes. This loss of repression leads to derepression of cyclin D1 and other proliferation-associated genes, promoting unrestrained G1/S transition and accelerated proliferation. Concomitantly, reduced p21 levels impair cell cycle checkpoints, while altered INSM1 expression may further perturb neuroendocrine differentiation pathways. Consequently, the CASZ1-knockout AGS cells exhibit enhanced proliferative capacity, altered cell cycle profiles, and diminished differentiation markers, recapitulating aggressive tumor phenotypes.
These polyclonal knockout cells are ideally suited for dissecting the tumor-suppressive roles of CASZ1 in gastric adenocarcinoma, including its impact on cell cycle regulation, transcriptional control, and epithelial differentiation. Researchers can employ the model in proliferation and colony formation assays, flow-cytometric cell cycle analysis, and migration/invasion studies to quantify phenotypic consequences of CASZ1 loss. Additionally, the polyclonal population provides a basis for RNA-seq or ChIP-seq experiments to map genome-wide transcriptional changes and chromatin occupancy of related factors such as REST and HDAC1. Co-immunoprecipitation studies can probe the integrity of CASZ1-containing repressor complexes, while rescue experiments validate pathway dependencies. For further information or to inquire about custom services, please contact Ascent Research.
