Sequence-universal recognition of duplex DNA by oligonucleotides via pseudocomplementarity and helix invasion.

The well-known Watson-Crick complementarity rules, which were discovered 50 years ago, elegantly direct the specific pairing of two DNA single strands. On the contrary, once formed, the double-stranded (ds) DNA lacks such a simple and sequence-universal recognition principle, since most of the characteristic chemical groups of nucleobases are now buried deep inside the double helix, the major DNA form. We report a promising versatile approach for highly selective recognition of designated sites within dsDNA featuring considerable practical potential for a variety of molecular-biological, biotechnological, gene-therapeutic, and diagnostic applications. It may also have implications for prebiotic evolution of genetic machinery at the primordial stages of the origin of life. Our design synergistically employs the robust helix-invasion ability of recently developed DNA mimics and analogs, pseudocomplementary peptide nucleic acids and pseudocomplementary oligonucleotides, thus enabling the sequence-unrestricted recognition of chosen DNA duplexes by nucleobase oligomers. Using this basically general approach, we selectively tagged a unique mixed-base site on the target dsDNA fragment with streptavidin and/or multiply labeled this site with fluorophores via the primer-extension reaction.

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