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2016 ; 24
(9
): 1581-91
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Advanced Design of Dumbbell-shaped Genetic Minimal Vectors Improves Non-coding
and Coding RNA Expression
#MMPMID27357627
Jiang X
; Yu H
; Teo CR
; Tan GS
; Goh SC
; Patel P
; Chua YK
; Hameed NB
; Bertoletti A
; Patzel V
Mol Ther
2016[Sep]; 24
(9
): 1581-91
PMID27357627
show ga
Dumbbell-shaped DNA minimal vectors lacking nontherapeutic genes and bacterial
sequences are considered a stable, safe alternative to viral, nonviral, and naked
plasmid-based gene-transfer systems. We investigated novel molecular features of
dumbbell vectors aiming to reduce vector size and to improve the expression of
noncoding or coding RNA. We minimized small hairpin RNA (shRNA) or microRNA
(miRNA) expressing dumbbell vectors in size down to 130?bp generating the
smallest genetic expression vectors reported. This was achieved by using a
minimal H1 promoter with integrated transcriptional terminator transcribing the
RNA hairpin structure around the dumbbell loop. Such vectors were generated with
high conversion yields using a novel protocol. Minimized shRNA-expressing
dumbbells showed accelerated kinetics of delivery and transcription leading to
enhanced gene silencing in human tissue culture cells. In primary human T cells,
minimized miRNA-expressing dumbbells revealed higher stability and triggered
stronger target gene suppression as compared with plasmids and miRNA mimics.
Dumbbell-driven gene expression was enhanced up to 56- or 160-fold by
implementation of an intron and the SV40 enhancer compared with control dumbbells
or plasmids. Advanced dumbbell vectors may represent one option to close the gap
between durable expression that is achievable with integrating viral vectors and
short-term effects triggered by naked RNA.