The KCNJ2 Knockout CAL-27 Polyclonal Cells comprise a CRISPR/Cas9-edited polyclonal knockout population generated from the CAL-27 human tongue squamous cell carcinoma line through targeted disruption of the KCNJ2 gene. The polyclonal nature preserves genetic diversity and mitigates clonal artifacts, making it suitable for pooled functional screens and studies requiring average cellular responses. This mixed genotype pool provides a robust loss-of-function system without clonal bias, enabling studies of gene function in a heterogeneous cell context.
CAL-27 is a well-characterized adherent epithelial cell line isolated from an oral squamous cell carcinoma of the tongue. It harbors mutations in TP53 and exhibits amplified EGFR signaling, providing a relevant genetic context for studying oncogenic processes. It is commonly used to investigate head and neck cancer biology, drug responses, and oncogenic signaling networks. Its established growth properties and genetic background offer a consistent platform for knockout models.
KCNJ2 encodes the inward rectifier potassium channel Kir2.1, which stabilizes the resting membrane potential and is regulated by intracellular Mg2?, polyamines, and the phospholipid PIP2. Transcription factors TFAP2 and SOX2 control its expression, while scaffold proteins DLG1 and DLG4 mediate its membrane localization and interaction with integrins. Knockout of KCNJ2 induces membrane depolarization, leading to opening of voltage-gated calcium channels, elevated cytoplasmic Ca2?, and subsequent activation of AKT and MAPK/ERK signaling cascades that influence cell cycle regulators and apoptosis-related proteins.
In the CAL-27 carcinoma context, loss of Kir2.1 perturbs ionic homeostasis and exaggerates pro-survival and proliferative signaling, closely mimicking oncogenic pathway activation observed in aggressive tumors. This model thus enables dissection of ion channel contributions to cancer progression, metastasis, and therapeutic resistance. Furthermore, this knockout system facilitates exploration of the interplay between potassium channels and integrin-mediated adhesion, as Kir2.1 interacts with DLG1/DLG4 and integrins at the cell cortex. It also serves as a tool for investigating KCNJ2-linked channelopathies such as Andersen-Tawil syndrome and familial atrial fibrillation.
Researchers can leverage this polyclonal knockout product for electrophysiological profiling via patch-clamp, for functional assays measuring proliferation, migration, and apoptosis, and for drug screening targeting ion channels or downstream MAPK/AKT nodes. It is also compatible with immunofluorescence, flow cytometry, and transcriptomic analysis to map global signaling changes. For further details or technical inquiries, please contact Ascent Research.
