Abstract
Internal ribosomal entry sites (IRES) allow cap-independent translation and are sequences that are often used in gene therapy for strategies in which several genes need to be expressed. In this study, two different sequences of encephalomyocarditis virus (EMCV) IRES were compared for their translation efficiency in the context of retroviral vectors. When the sequence surrounding the 11th AUG of the IRES was conserved (IRESg), the translation efficiency was significantly higher than if the AUG of the downstream gene started with the 11th AUG of the IRES (IRESb). The translation efficiency with IRESg was influenced by the cell type and also by the nature of the transgene.
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