Abstract
The advantages and disadvantages of viral and non-viral vectors for gene delivery are reviewed. Advances in systems for introduction of new gene expression are described, including self-deleting retroviral transfer vectors, chimeric viruses and chimeric oligonucleotides. Systems for inhibition of gene expression are also discussed including antisense oligonucleotides, ribozymes and dominant-negative genes. Examples of the use of these systems in animal models and clinical trials for gastrointestinal disorders are discussed.
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