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It has been recently suggested that catheter-based delivery of adenoviral vectors may result in the loss of vector infectivity.
However, transgene expression is usually transient, especially in dividing target cells due to loss of vector genomes.
Although current loss of vector control here is likely due largely to insecticide resistance of An. funestus s.s.s
Figure 1 shows that direct bolus delivery through the 15 cm cannula produced significant loss of vector titre compared to a bolus control (p <0.01, ANOVA).
Interestingly, this decrease in skipping and dystrophin levels correlated with the levels of U7ex23 transgene detected in the muscles (Supplementary Material, Fig. S3), indicating a loss of vector genome over time.
Analysis of the same cultures 2 weeks after transduction showed a nearly complete loss of vector genomes and GFP+ cells in the IDLV-transduced cells, as expected for an episomal form.
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Temperature resistant colonies were screened at 37°C for the loss of vector-mediated spectinomycin resistance.
In contrast to liver- and muscle-directed gene therapy trials, in which reactivation of memory T-cell responses resulted in loss of vector-modified cells and thus attenuated therapeutic efficacy (Manno et al, 2006; Mendell et al, 2010), subretinal injection of AAV vectors mounted only low humoral immune responses.
In addition, (i) the use of large native DNA fragments may lead to the recombination of the replicative vectors with the chromosome, (ii) removal of selective pressure may lead to loss of the vector and (iii) DNA structure of the vectors may have a strong influence on transcription.
The specific/noisier behavior of the ASM FM3A instrument on Swarm Charlie is very clear (until the anomaly of 5 November 2014 and the subsequent loss of ASM vector data).
Another method was presented by the same authors in their earlier published contribution[180] where the effects of loss of motion vector information and prediction residuals were incorporated for quality estimation.
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Justyna Jupowicz-Kozak
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