In some RNA viruses (e.g. in brome mosaic virus, BMV), the same factor (intra- or intermolecular hybridization between viral RNA molecules) is capable of inducing two different processes: RNA silencing and RNA recombination. To determine whether there is some interplay between these two phenomena, we have examined if the BMV-based recombination vector containing a plant-genome-derived sequence can function as a gene-silencing vector. Surprisingly, we found that neither dsRNA forming during the replication of the BMV-based vector nor highly structured regions of its genome were effective RNAi triggers. Only mutants carrying a sequence complementary to the target mRNA functioned as gene silencing vectors and were steadily maintained in the infected plant. The constructs containing a sense sequence or inverted repeats did not induce gene silencing but instead were eliminated from the plant cells.
Archives of Virology – Springer Journals
Published: Feb 1, 2010
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