The EFNA1 Knockout HT29 Polyclonal Cells are a CRISPR/Cas9-edited polyclonal knockout cell population derived from the HT29 colorectal adenocarcinoma cell line, designed to disrupt the EFNA1 gene. This gene encodes ephrin-A1, a GPI-anchored ligand that mediates bidirectional signaling through Eph receptor tyrosine kinases. The polyclonal pool comprises a heterogeneous mixture of cells harboring various gene-disruption events, effectively creating a loss-of-function model for studying ephrin-A1-dependent processes.
HT29 is an established human colorectal adenocarcinoma epithelial cell line with typical epithelial morphology. Widely used as a model for intestinal epithelial biology, HT29 cells are employed to investigate differentiation, transport mechanisms, and cancer pathogenesis. Their utility in colorectal cancer research stems from their origin as a well-characterized adenocarcinoma, enabling the study of signaling pathways that drive tumor progression, metastasis, and therapeutic resistance. This genetic background provides a clinically relevant context for evaluating the functional consequences of EFNA1 knockout.
Ephrin-A1, encoded by EFNA1, functions as a membrane-bound ligand for Eph receptors, primarily EphA2 and EphA4. Upon ligand-receptor engagement, bidirectional signals are transduced: forward signaling through Eph receptors and reverse signaling through ephrin-A1. Downstream of EphA2, ephrin-A1 activates PI3K-AKT and MAPK/ERK pathways via adaptors Grb2 and Nck, leading to phosphorylation of FAK and SRC. These cascades regulate cytoskeletal dynamics through Rho GTPases like RhoA and RAC1, controlling adhesion, migration, and survival. Upstream regulators include HIF1A, NF-??B, and cytokines TNF-??, IL-1??, and VEGF, linking expression to hypoxic and inflammatory microenvironments. Ephrin-A1 also interacts with integrin ??1 and is shed by ADAM10, modulating cell-ECM interactions.
In HT29 colorectal cancer cells, EFNA1 knockout disrupts the ephrin-A1/EphA2 signaling axis, impairing downstream activation of AKT1, MAPK1/3 (ERK1/2), and SRC, which are critical for proliferation, migration, and anoikis resistance. This model is significant for dissecting ephrin-A1??s role in colorectal adenocarcinoma progression. Since HT29 cells exhibit some differentiation capacity and respond to microenvironmental cues, the polyclonal knockout population is valuable for investigating how loss of ephrin-A1 affects tumor cell behavior, epithelial-mesenchymal transition, and stromal communication.
Research applications include colorectal cancer progression studies, tumor cell migration and invasion assays, Eph-ephrin signaling dissection, drug resistance screening, angiogenesis models, and tumor microenvironment research. Representative assays that can be performed with these cells include western blotting for ephrin-A1 and phospho-EphA2, RT-qPCR analysis of downstream targets such as RAC1 and FAK, wound healing and transwell migration assays, flow cytometry for apoptosis (annexin V), immunofluorescence for adhesion proteins like integrin ??1, and drug sensitivity testing to evaluate therapeutic responses. For further information, please contact Ascent Research.
