GDA Knockout Raji Polyclonal Cells are a CRISPR/Cas9-edited polyclonal knockout cell population derived from the Raji human Burkitt’s lymphoma B lymphocyte cell line, designed to disrupt the GDA gene encoding guanine deaminase. This polyclonal knockout model provides a heterogeneous pool of cells with GDA gene disruption, enabling study of purine metabolism and associated diseases without the need for clonal isolation. The use of a polyclonal population reflects the natural diversity of CRISPR/Cas9-mediated gene disruption events, facilitating robust assessment of loss-of-function phenotypes in a cell pool context.
The Raji cell line is an Epstein-Barr virus (EBV)-positive, suspension-adapted B lymphocyte model originally derived from a Burkitt’s lymphoma patient. As a B lymphocyte, Raji cells perform antibody production and immune surveillance functions, making them a widely used model for lymphoma biology, immune signaling, and drug discovery. Their stable growth characteristics and defined genetic background facilitate reproducible experimentation in purine metabolism and nucleotide homeostasis research, particularly in the context of high proliferative demand and stress responses.
GDA functions as a critical enzyme in the purine catabolic pathway, catalyzing the hydrolytic deamination of guanine to xanthine with concomitant ammonia release, thereby modulating intracellular GTP and cGMP pools. In Raji cells, GDA expression is regulated by transcription factors including p53, NF-??B, and HIF1A, linking purine metabolism to cellular stress responses and proliferative signals. The enzyme operates downstream of guanine and upstream of xanthine, which is subsequently oxidized by xanthine oxidase to uric acid. GDA activity also influences ammonia metabolism and interacts with cytoskeletal tubulin, suggesting roles beyond nucleotide homeostasis.
Disruption of GDA in the Raji B lymphocyte model perturbs the balance of purine nucleotide pools, potentially leading to accumulation of guanine and depletion of xanthine and uric acid. Given the high proliferative rate of lymphoma cells and their reliance on nucleotide biosynthesis, GDA knockout may impair cellular energy metabolism and stress adaptation, especially under conditions of nucleotide starvation or hypoxic stress, where HIF1A and NF-??B are active. This model thus serves as a valuable tool for investigating the role of purine catabolism in B-cell lymphoma progression and metabolic vulnerabilities, including effects on cell viability and ammonia handling.
Researchers can employ GDA Knockout Raji Polyclonal Cells to delineate purine metabolic flux using targeted metabolomics and guanine deaminase activity assays, or to monitor uric acid production and ammonia release in response to pharmacological modulators. This knockout model is particularly suited for drug screening applications aimed at managing hyperuricemia and tumor lysis syndrome, as well as for RNA-seq-based transcriptomic studies of nucleotide homeostasis in B-cell lymphomas. Integration with flow cytometry and cell viability assays enables functional readouts of metabolic stress responses. For further information or technical support, contact Ascent Research.
