“Faust et al. hypothesized that a vector genome devoid of CpG motifs would be mostly invisible to TLR9. Sure enough, a vector containing such a stealthy genome packaged into the identical capsid failed to elicit CD8+ T-cell responses to a reporter gene, thus directing long-term expression even in wild-type mice with intact TLR9. The same concept applies to less immunogenic serotypes, where already weak responses can be further reduced. Future studies are likely to adapt this concept to therapeutic gene constructs.”
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