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Nucleic Acids Research 2005 33(2):796-804; doi:10.1093/nar/gki220
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Published online 1 February 2005

© The Author 2005. Published by Oxford University Press. All rights reserved
The online version of this article has been published under an open access model. Users are entitled to use, reproduce, disseminate, or display the open access version of this article for non-commercial purposes provided that: the original authorship is properly and fully attributed; the Journal and Oxford University Press are attributed as the original place of publication with the correct citation details given; if an article is subsequently reproduced or disseminated not in its entirety but only in part or as a derivative work this must be clearly indicated. For commercial re-use, please contact journals.permissions{at}oupjournals.org

Article

HIV-1 can escape from RNA interference by evolving an alternative structure in its RNA genome

Ellen M. Westerhout, Marcel Ooms, Monique Vink, Atze T. Das and Ben Berkhout*

Department of Human Retrovirology, Academic Medical Center, University of Amsterdam Meibergdreef 15, 1105 AZ Amsterdam, The Netherlands

*To whom correspondence should be addressed. Tel: +31 20 566 4822; Fax: +31 20 691 6531; Email: b.berkhout{at}amc.uva.nl

Received December 10, 2004. Revised January 13, 2005. Accepted January 13, 2005.

HIV-1 replication can be efficiently inhibited by intracellular expression of an siRNA targeting the viral RNA. However, HIV-1 escape variants emerged after prolonged culturing. These RNAi-resistant viruses contain nucleotide substitutions or deletions in or near the targeted sequence. We observed an inverse correlation between the level of resistance and the stability of the siRNA/target-RNA duplex. However, two escape variants showed a higher level of resistance than expected based on the duplex stability. We demonstrate that these mutations induce alternative folding of the RNA such that the target sequence is occluded from binding to the siRNA, resulting in reduced RNAi efficiency. HIV-1 can thus escape from RNAi-mediated inhibition not only through nucleotide substitutions or deletions in the siRNA target sequence, but also through mutations that alter the local RNA secondary structure. The results highlight the enormous genetic flexibility of HIV-1 and provide detailed molecular insight into the sequence specificity of RNAi and the impact of target RNA secondary structure.


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