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Sir William Dunn School of Pathology, University of Oxford, South Parks Road, Oxford OX1 3RE, U.K.
Antisense RNA, which has a sequence complementary to mRNA, may provide the basis for antiviral therapies of high selectivity. We have explored the inhibitory effect of six antisense RNAs upon the replication of human immunodeficiency virus (HIV) in cell culture. We chose regions of the HIV genome to test whether sequences required for splicing or for translation initiation were more susceptible to antisense RNA interference. Our results suggest that inhibitory antisense RNAs contain sequences complementary to the AUG initiation codon of the tat gene and have a comparatively low tendency to form intramolecular base pairs which would interfere with intermolecular duplex formation. Inhibition can be substantial (over 70%) but is transient. Transience does not result from mutation of the input virus. Inhibition was not a consequence of the induction of interferon by antisense RNA-mRNA duplex formation. Our results suggest that at least part of the inhibitory effect is at the post-transcriptional level.
Present address: Xenova Ltd, Slough SL1 4EQ, U.K.
Received 22 December 1989;
accepted 24 May 1990.
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