The GNAI1 Knockout Raji Polyclonal Cells are a CRISPR/Cas9-edited polyclonal knockout cell population featuring targeted disruption of the GNAI1 gene in Raji B lymphocytes. This model yields a heterogeneous pool of cells carrying diverse loss-of-function mutations in the G??i1-encoding gene, enabling functional studies without the biases of clonal selection. It is especially suited for population-level analyses where physiological variability is informative.
The host Raji cell line is an EBV-positive B-lymphoblastoid line originating from a Burkitt lymphoma patient, extensively utilized in immunological and cancer research. Raji cells maintain key mature B-cell features, including responsiveness to chemokines and other GPCR ligands, making them a fitting platform for investigating GPCR-mediated signaling in malignant B-cell contexts.
GNAI1 encodes the G??i1 subunit, which upon activation by GPCRs??including chemokine receptors, dopamine D2 receptor, and ??2-adrenergic receptor??inhibits adenylyl cyclase isoforms such as ADCY5 and ADCY6. This reduces cAMP synthesis, diminishing PKA activity and CREB phosphorylation. Concomitantly, G?¦? subunits liberated from the heterotrimer stimulate PI3K??, leading to AKT and ERK1/2 activation. Regulatory proteins, such as RGS proteins and AGS3 (GPSM1), modulate G??i1 signal duration and specificity. Thus, the canonical pathway GPCR ?? G??i1 ?? adenylyl cyclase ?? ??cAMP ?? ??PKA ?? ??CREB phosphorylation, together with the G?¦? ?? PI3K?? ?? AKT/ERK branch, constitutes the core G??i1 signaling axis.
In Raji cells, disruption of GNAI1 abolishes G??i-mediated adenylyl cyclase inhibition, resulting in elevated basal and stimulated cAMP levels. Consequently, phosphorylation states of key effectors such as CREB, ERK1/2, and AKT are altered, influencing proliferation, survival, and chemotactic responses. Given the importance of these pathways in Burkitt lymphoma, the knockout model provides a means to dissect the contributions of G??i1 to malignant B-cell biology, including its role in transducing signals from autocrine and paracrine factors.
The polyclonal knockout population is amenable to a range of experimental techniques. cAMP accumulation can be measured by ELISA or GloSensor assays, while Western blotting of phospho-CREB, phospho-ERK, and phospho-AKT reports on downstream pathway activation. Functional studies may include MTT-based proliferation assays, flow cytometric analysis of cell cycle and apoptosis, and chemotaxis assays to evaluate directed migration. These cells are also suitable for RT-qPCR profiling of transcriptional targets. Applications encompass GPCR-targeted drug screening for lymphoma therapies and mechanistic studies of G??i1 in B-cell signaling. For further technical information, please contact Ascent Research.
