Entomological Research

The Entomological Society of Korea (한국곤충학회)
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Application of simple and massive purification system of dsRNA in vivo for acute toxicity to Daphnia magna

  • CHOI, Wonkyun (Division of Ecological Conservation, Bureau of Ecological Research, National Institute of Ecology) ;
  • LIM, Hye Song (Division of Ecological Conservation, Bureau of Ecological Research, National Institute of Ecology) ;
  • KIM, Jin (Central Research Institute, Kyungnong Co.) ;
  • RYU, Sung-Min (Central Research Institute, Kyungnong Co.) ;
  • LEE, Jung Ro (Division of Ecological Conservation, Bureau of Ecological Research, National Institute of Ecology)
  • Received : 2018.08.23
  • Accepted : 2018.10.11
  • Published : 2018.11.29
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Abstract

The RNA interference (RNAi) has been considered as an important genetic tool and applied to develop a new living modified (LM) crop trait which is an improvement of nutrient quality or pest management. The RNAi of DvSnf7 has been used for resistance to LM maize and the Western Corn Rootworm which is a major agricultural pest for the US Corn Belt. Most of the environmental risk assessments (ERA) of double strand RNA (dsRNA) have been performed using in vitro transcript products, and not in vivo expressed product. A large amount of dsRNA was required for the acute toxicity assay of water fleas. Therefore development of massive dsRNA purification techniques is critical. Daphnia, a freshwater microcrustacean, is a model organism for studying cellular and molecular mechanism involved in life history traits and ecotoxicology. In this study, we established the massive dsRNA purification method using Escherichia coli and implemented acute toxicity assays to Daphnia magna. As a result, the present RNase A and DNase I, dsRNA was efficiently purified without any special techniques or equipment. Even though purified dsRNA existed during the acute toxicity test, lethality or abnormal behavior were not observed in D. magna. These results indicated that GFP and DvSnf7 dsRNA were not significantly affected to D. magna due to their lack of sequence matching in its genome. The purification method of dsRNA and the acute toxicity assay of water fleas using purified dsRNA would be suitable for the toxicological studies of LMOs to aquatic non-target organisms.

Keywords

Acknowledgement

Supported by : National Institute of Ecology (NIE)

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