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        Design and Function of Triplex Hairpin Ribozymes

        互联网

        615
        Triplex ribozymes allow for the individual activity of multiple trans -acting ribozymes producing higher target cleavage relative to tandem-expressed RZs. A triplex expression system based on a single hairpin ribozyme for the multiple expression (multiplex) vectors can be engineered to target RNAs with single or multiple antisense-accessible sites. System construction relies on triplex expression modules consisting of hairpin ribozyme cassettes flanked by ribozymes lacking catalytic domains. Multiplex vectors can be generated with single or multiple specificity by tandem cloning of triplex expression modules. Triplex ribozymes are initially tested in vitro using cis- and trans -cleavage assays against radioactive-labeled targets. In addition, triplex ribozymes are tested for cis and trans cleavage in vivo by transfection in cultured cells followed by ribonuclease protection assays (RPAs) and RT-PCR. The use of triplex configurations with multiplex ribozymes will provide the basis for the development of future RZ-based therapies and technologies.
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