miRNA-mediated post-transcriptional silencing of transgenes leads to increased adeno-associated viral vector yield and targeting specificity.

Abstract:

:The production of high-titer recombinant adeno-associated virus (rAAV) vector is essential for treatment of genetic diseases affecting the retina and choroid, where anatomical constraints may limit injectable volumes. Problematically, cytotoxicity arising from overexpression of the transgene during vector production frequently leads to a reduction in vector yield. Herein, we evaluate the use of microRNA (miRNA)-mediated silencing to limit overexpression of cytotoxic transgenes during packaging as a method of increasing vector yield. We examined if post-transcriptional regulation of transgenes during packaging via miRNA technology would lead to increased rAAV yields. Our results demonstrate that silencing of cytotoxic transgenes during production resulted in up to a 22-fold increase in vector yield. The inclusion of organ-specific miRNA sequences improved biosafety by limiting off-target expression following systemic rAAV administration. The small size (22-23 bp) of the target site allows for the inclusion of multiple copies into the vector with minimal impact on coding capacity. Taken together, our results suggest that inclusion of miRNA target sites into the 3'-untranslated region of the AAV cassette allow for silencing of cytotoxic transgenes during vector production leading to improved vector yield, in addition to increasing targeting specificity without reliance on cell-specific promoters.

journal_name

Gene Ther

journal_title

Gene therapy

authors

Reid CA,Boye SL,Hauswirth WW,Lipinski DM

doi

10.1038/gt.2017.50

subject

Has Abstract

pub_date

2017-08-01 00:00:00

pages

462-469

issue

8

eissn

0969-7128

issn

1476-5462

pii

gt201750

journal_volume

24

pub_type

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