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• W3169422738 abstract "Abstract RNA-based pesticides exert their function by suppressing the expression of an essential gene in the target pest through RNA interference caused by double-stranded RNA (dsRNA). Here, we selected target genes for growth suppression of the solanaceous crop pests ladybird beetle ( Henosepilachna vigintioctopunctata ) and Colorado potato beetle ( Leptinotarsa decemlineata )-the death-associated inhibitor of apoptosis protein 1 gene ( diap1 ), and an orthologous gene of the COPI coatomer protein complex ( copI ), respectively. We constructed a cost-competitive overproduction system for dsRNA using Corynebacterium glutamicum as a host bacterium. The dsRNA expression unit was equipped with two sets of promoters and terminators derived from coliphage T7, and the convergent expression system was designed to be selectively transcribed by T7 RNA polymerase. This expression system efficiently overproduced both target dsRNAs. On culture in a jar fermentor, the yield of diap1 -targeting dsRNA (approximately 360 bp) was > 1 g per liter of culture. Long-chain diap1 -targeting dsRNAs (up to around 1 kbp) could be produced without a substantial loss of efficiency. dsRNA accumulated in C. glutamicum significantly suppressed larval growth of H. vigintioctopunctata . The dsRNA expression technology developed here is expected to substantially reduce dsRNA production costs. Our method can be applied for a wide range of industrial uses, including agricultural pest control. Key points • Overexpression of dsRNA was achieved in C. glutamicum using a coliphage T7 system. • The best strain produced > 1 g/L of the target dsRNA species, for use as an insecticide. • The developed system efficiently produced long dsRNA species, up to ~ 1 kbp." @default.
• W3169422738 created "2021-06-22" @default.
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• W3169422738 date "2021-06-01" @default.
• W3169422738 modified "2023-10-17" @default.
• W3169422738 title "Efficient production of long double-stranded RNAs applicable to agricultural pest control by Corynebacterium glutamicum equipped with coliphage T7-expression system" @default.
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• W3169422738 doi "https://doi.org/10.1007/s00253-021-11324-9" @default.
• W3169422738 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/8236056" @default.
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