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Geographic variation in RNAi sensitivity in the migratory locust.

Gene 2017 March 21
The RNA interference (RNAi) technology has been widely used in basic and applied research. It is known that RNAi works in some species but not in others, although the cause for this difference remains unclear. Here, we present inter- and intra-populational variations in RNAi sensitivity in the migratory locust Locusta migratoria, and provide information on the genetic background of such variations. In the four strains analyzed, originating from different Japanese localities, most individuals from two of the strains were sensitive to injections of double-stranded RNA (dsRNA) against the corazonin (CRZ) and ecdysone receptor genes, whereas those from the other two strains were resistant. Selection for individuals sensitive to dsCRZ produced a dramatic increase in the RNAi sensitivity in the following generations, although phenotypes also varied in the selected line, suggesting that several genes might control RNAi sensitivity. Reciprocal crosses between a sensitive and a resistant strain suggested that the resistant phenotype is dominant. The expression levels of nine RNAi-associated genes known for other organisms were not correlated with the variation in RNAi sensitivity observed in L. migratoria. Variations in RNAi sensitivity as the ones observed in this study should be considered when using RNAi in basic and applied research as well as in pest management.

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