Viral vector assay and vector
A process for assaying viral vector manufactured by large-scale viral vector manufacturing processes to assure the resulting vector has acceptable purity and potency. The process entails three different types of assays, each one of which is optionally useful on a stand-alone basis, and which together provide the first system able to assure the quality of viral vector produced by large-scale vector manufacturing processes.
1. A process for manufacturing a viral vector having an expressible transgene that can express a polypeptide that has biological activity, comprising: obtaining a sample of the viral vector having the expressible transgene that can express the polypeptide that has biological activity, and then
assaying said sample by a. measuring viral vector infectious titer by calculating a linear response curve to measure relative infectivity using the Slope Ratio method; and using at least two assays selected from the group consisting of:
b. measuring transgene expression,
c. measuring the activity of the polypeptide expressed by said transgene, and
d. measuring viral particle titer.
2. The process of claim 1 , wherein said assaying said sample comprises a. measuring viral vector infectious titer by calculating a linear response curve to measure relative infectivity using the Slope Ratio method, b. measuring transgene expression and c. measuring the activity of the polypeptide expressed by said transgene.
3. The process of claim 1 , wherein said assaying said sample comprises d. measuring viral particle titer.
4. The process of claim 1 , wherein said assaying said sample comprises: a. measuring viral vector infectious titer, b. measuring transgene expression, c. measuring the activity of the polypeptide expressed by said transgene, and d. measuring viral particle titer.