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        Lentiviral Vector Delivery of shRNA into Cultured Primary Myogenic Cells: A Tool for Therapeutic Target Validation

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        RNA interference has emerged as a powerful technique to down-regulate gene expression. The lentiviral vector-mediated expression of small hairpin RNAs (shRNAs) from polymerase III promoters allows permanent down-regulation of a specific gene in a wide range of cell types both in vitro and in vivo. In this chapter, we describe a method permitting the expression of shRNA from lentiviral vectors in primary murine myogenic cells. We designed shRNAs targeted to the muscular glycogen synthase isoform (shGYS1), a highly regulated enzyme responsible for glycogen synthesis, in order to modulate the muscle glycogen biosynthetic pathway and to improve the phenotype in primary myogenic cells from a murine model of glycogen storage disease type II (GSDII). This method based on shRNA-mediated down-regulation could be applied to other muscular disorders to evaluate new therapeutic options.
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