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Twisted intercalating nucleic acid is a nucleic acid molecule that, when added to triplex-forming oligonucleotides , stabilizes Hoogsteen triplex DNA formation from double-stranded DNA and TFOs. Its ability to twist around a triple bond increases ease of intercalation within double stranded DNA in order to form triplex DNA. Certain configurations have been shown to stabilize Watson-Crick antiparallel duplex DNA. TINA-DNA primers have been shown to increase the specificity of binding in PCR. The use of TINA insertions in G-quadruplexes has also been shown to enhance anti-HIV-1 activity. TINA stabilized PT demonstrates improved sensitivity and specificity of DNA based clinical diagnostic assays.
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