The OPA3 Knockout Raji Polyclonal Cells are a CRISPR/Cas9-edited polyclonal knockout cell population derived from the Raji B lymphocyte line. These cells harbor a targeted disruption of the OPA3 gene, resulting in loss of OPA3 protein expression and providing a powerful model for studying mitochondrial dynamics and apoptosis in a lymphoblastoid context. The polyclonal nature of the knockout pool ensures a heterogeneous genetic background, mitigating clone-specific artifacts and enabling robust population-level analyses.
Raji cells are a well-established human lymphoblastoid cell line isolated from a Burkitt lymphoma patient. They are Epstein-Barr virus (EBV)-positive and exhibit characteristics of mature B lymphocytes. Due to their rapid proliferation, suspension growth, and well-characterized signaling networks, Raji cells are widely utilized for investigating B-cell biology, lymphomagenesis, and EBV-related immune responses. As a model for B-cell malignancies, they provide a relevant system for dissecting oncogenic mechanisms and evaluating therapeutic interventions.
OPA3 encodes a mitochondrial outer membrane protein critical for maintaining mitochondrial cristae organization and regulating apoptotic pathways. OPA3 functions downstream of mitochondrial biogenesis factors such as PGC-1?? and is responsive to oxidative stress. It directly interacts with key mitochondrial dynamics proteins including OPA1, mitofusin-1 (MFN1), mitofusin-2 (MFN2), and components of the MICOS complex. Loss of OPA3 disrupts mitochondrial cristae structure, leading to impaired mitochondrial fusion and fission dynamics, altered cytochrome c sequestration, and enhanced caspase activation. Consequently, OPA3 acts upstream of apoptotic executioners, linking mitochondrial morphology to cell survival decisions.
In Raji B cells, OPA3 knockout is particularly relevant for exploring the intersection of mitochondrial dysfunction and B-cell lymphoma. The Raji line’s dependence on oxidative phosphorylation and glycolytic plasticity makes it an ideal host for evaluating how OPA3 loss impacts cellular energetics, proliferation, and stress adaptation. Given the association of OPA3 mutations with Costeff syndrome (3-methylglutaconic aciduria type III) and autosomal dominant optic atrophy with cataract, this model also facilitates investigation of optic atrophy-related signaling pathways in a tractable cellular context. The polyclonal knockout population enables studies of heterogeneous responses to mitochondrial stress within a lymphoma background.
This polyclonal knockout cell model is suitable for a range of experimental workflows. Researchers can employ Western blotting to confirm OPA3 ablation and assess expression of OPA1, MFN1, MFN2, and cytochrome c. Mitochondrial morphology can be visualized via immunofluorescence, while apoptosis assays (Annexin V/propidium iodide staining) and cytochrome c release assays quantify cell death sensitivity. Metabolic flux analysis using Seahorse platforms reveals changes in oxygen consumption and extracellular acidification rates. RT-qPCR profiling of mitochondrial dynamics genes (e.g., OPA1, DRP1, FIS1) further elucidates compensatory mechanisms. Co-immunoprecipitation experiments permit interrogation of altered OPA3-interacting complexes. This model supports drug screening for mitochondrial disorders and studies of B-cell lymphoma pathogenesis. For additional technical specifications or ordering information, please contact Ascent Research.
