Abstract
Current antisense oligonucleotides designed for drug therapy rely on Watson-Crick base pairing for the specificity of interactions between antisense and target molecules. However, thermodynamically stable duplexes containing non-Watson-Crick pairs have been formed with synthetic oligonucleotides. There are also numerous examples of non-canonical base pairs that participate in stable intra- and inter-molecular RNA/RNA pairing in prokaryotic and eukaryotic cells. Several natural antisense RNA/target RNA duplexes contain looped-out and bulged positions as well as non-canonical pairs as exemplified by formation of the Escherichia coli antisense micF RNA/ompF mRNA duplex. Secondary structures and the phylogenetic conservation of nucleotide sequences are well characterized in this system. Natural antisense/ target interactions may serve as models for determining possible and optimal antisense/target interactions in oligonucleotide drug design.
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