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Inteins catalyze protein splicing in a fashion similar to how self-splicing introns catalyze RNA splicing. Splitinteins catalyze precise ligation of two separate polypeptides through trans-splicing in a highly specific manner. Here we report a method of using protein trans-splicing to circumvent the packaging size limit of gene therapy vectors. To demonstrate this method, we chose a large dystrophin gene and an adeno-associated viral (AAV) vector, which has a small packaging size. A highly functional 6.3-kb Becker-form dystrophin cDNA was broken into two pieces and modified by adding appropriate split-intein coding sequences, resulting in splitgenes sufficiently small for packaging in AAV vectors. The two split-genes, after codelivery into target cells, produced two polypeptides that spontaneously trans-spliced to form the expected Becker-form dystrophin protein in cell culture in vitro. Delivering the split-genes by AAV1 vectors into the muscle of a mouse model of Duchenne muscular dystrophy rendered therapeutic gene expression and benefits.

ProteinTrans-Splicing as a Means for Viral Vector-MediatedIn VivoGene Therapy