Improved antibiotic-free DNA vaccine vectors utilizing a novel RNA based plasmid selection system.
Improved antibiotic-free DNA vaccine vectors utilizing a novel RNA based plasmid selection system.
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DOI:
10.1016/j.vaccine.2009.06.017
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发表时间:
2009-10-30
期刊:
影响因子:
5.5
通讯作者:
Williams JA
中科院分区:
文献类型:
--
作者:
Luke J;Carnes AE;Hodgson CP;Williams JA
To ensure safety, regulatory agencies recommend elimination of antibiotic resistance markers from therapeutic and vaccine plasmid DNA vectors. Here, we describe the development and application of a novel antibiotic-free selection system. Vectors incorporate and express a 150 bp RNA-OUT antisense RNA. RNA-OUT represses expression of a chromosomally integrated constitutively expressed counter-selectable marker (sacB), allowing plasmid selection on sucrose. Sucrose selectable DNA vaccine vectors combine antibiotic-free selection with highly productive fermentation manufacturing (>1 gm/L plasmid DNA yields), while improving in vivo expression of encoded proteins and increasing immune responses to target antigens. These vectors are safer, more potent, alternatives for DNA therapy or vaccination.
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