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JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
Selection of differently temporally regulated African swine fever virus promoters with variable expression activities and their application for transient and recombinant virus mediated gene expression.
Virology 2017 August
African swine fever virus threatens pig production worldwide due to the lack of vaccines, for which generation of both deletion and insertion mutants is considered. For development of the latter, operational ASFV promoters of different temporal regulation and strengths are desirable. We therefore compared the capacities of putative promoter sequences from p72, CD2v, p30, viral DNA polymerase and U104L genes to mediate expression of luciferase from transfected plasmids after activation in trans, or p30-, DNA polymerase- and U104L promoters in cis, using respective ASFV recombinants. We identified sequences with promoter activities upstream the viral ORFs, and showed that they differ in both their expression intensity regulating properties and in their temporal regulation. In summary, p30 and DNA polymerase promoters are recommended for high level early regulated transgene expression. For late expression, the p72, CD2v and U104L promoter are suitable. The latter however, only if low level transgene expression is aimed.
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