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JOURNAL ARTICLE
REVIEW
Recombinant micro-genes and dystrophin viral vectors.
Neuromuscular Disorders : NMD 2002 October
An effective gene therapy for Duchenne muscular dystrophy ideally relies on the ability to provide long-term expression to muscle tissue of the missing protein, dystrophin. Early work in the mdx mouse using a 6.3 kb mini-dystrophin cDNA, carried out in either adenoviral or retroviral vectors was generally successful, however, expression was only transient. In an attempt to remedy this problem, two approaches are being investigated. The first of these is a hybrid vector system that combines the efficacy of gene transfer into skeletal muscle of adenoviral vectors with the long-term stability of retroviral vectors. The second utilises the inherently efficient transducing properties and stability of the adeno-associated viral delivery system. Using highly truncated micro-dystrophin cDNAs we have shown that both vector systems were able to restore dystrophin and dystrophin-associated protein expression at the plasma membrane of mdx mice for prolonged periods of time. Additionally, evaluation of central nucleation indicated a significant inhibition of degenerative dystrophic muscle pathology. These studies suggest that hybrid adenoviral-retroviral and adeno-associated viral vectors are capable of ameliorating dystrophic pathology at the cellular level and as such are useful tools in the development of a gene therapy for Duchenne muscular dystrophy.
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