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Effects of the 2',4'-BNA modification on the sequence specificity of molecular beacons.

Molecular beacons (MBs) are stem-loop hairpin oligonucleotide probes with an internally quenched fluorophore. These probes recognize their targets with higher specificity than conventional linear probes. To further enhance sequence-specificity of MBs, we have designed and synthesized MBs having 2',4'-BNA modification. Thermodynamic analysis revealed that the MBs with the 2',4'-BNA-modified stem region have high sequence-specificity. In addition, the 2',4'-BNA modification in the loop region was also found to be efficient for discrimination of one base mismatch.