alexa Increasing the size of rAAV-mediated expression cassettes in vivo by intermolecular joining of two complementary vectors.
Genetics & Molecular Biology

Genetics & Molecular Biology

Journal of Genetic Syndromes & Gene Therapy

Author(s): Nakai H, Storm TA, Kay MA

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Abstract A major shortcoming to the use of adeno-associated virus (rAAV) vectors is their limited packaging size. To overcome this hurdle, we split an expression cassette and cloned it into two separate vectors. The vectors contained either a nuclear localizing Escherichia coli lacZ transgene (nlslacZ) with a splice acceptor, or the human elongation factor 1alpha ( EF1alpha) gene enhancer/promoter(s) (EF1alphaEP) with a splice donor. We co-injected a promoter-less nlslacZ vector with a vector containing either a single EF1alphaEP or a double copy of the EF1alphaEP in a head-to-head orientation, into the portal vein of mice. Gene expression, measured by both transduction efficiency and quantitation of the recombinant protein, was as much as 60-70\% of that obtained from mice that received a single vector containing a complete EFalphaEP/nlslacZ expression cassette. This two-vector approach may allow development of gene therapy strategies that will carry exogenous DNA sequences with large therapeutic cDNAs and/or regulatory elements. This article was published in Nat Biotechnol and referenced in Journal of Genetic Syndromes & Gene Therapy

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