GMP Analytical Testing in Gene Therapy Products

Gene therapy holds the promise to transform medicine and creates options for patients who are living with incurable diseases. The industry has been booming in the last 20 years. Before a gene therapy product can be used in humans, the product must be tested for safety and effectiveness.

For in vivo genome modification, the most used gene delivery method is by Adeno-associated virus (AAV) vectors. For AAV-based gene therapy products, a full scale of testing methods have been established to ensure the identity (CE-SDS, LC-MS, Q-PCR/D-PCR), potency (A260/A280, HPLC, TCID50 and Infectivity assay), purity (Host cell DNA/Protein, residual plasmid DNA, Residual BSA and Benzonase by ELISAs, residual cesium, RCA, AUC for Empty : Full ratio), and safety (BioBurden, Endotoxin, Sterility, Mycoplasma, etc.).

For in vitro genome modification, Lenti viral vectors are used to genetically modify the patient’s own T cells to express a chimeric antigen receptor (CAR) designed to recognize and bind to a target antigen on tumor cells to eliminate the tumor cells. For Lenti viral gene therapy products, genomic titer and p24 ELISA are widely used for the calculation of viral titer. In addition to the mentioned assays, RCL, VSVg, and SV40 tests are often used as a safety test for Lenti viral products.

This webinar focuses on the introduction of three critical test methods: AUC, Infectivity and RCL assays. Newly released FDA draft guidance for Industry on human gene therapy products will also be discussed.

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