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Clinical Chemistry 38: 687-694, 1992;
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Clinical Chemistry, Vol 38, 687-694, Copyright © 1992 by American Association for Clinical Chemistry

Triple-helical capture assay for quantification of polymerase chain reaction products

CP Vary
Idexx Corp., Portland, ME 04101.

This method for rapid, automated analysis of polymerase chain reaction (PCR) products makes use of PCR primers containing 5'-polypyrimidine sequences. Polypyrimidine-"headed" primers confer to the PCR product the ability to form triple helical complexes with a third polypyrimidine oligonucleotide. Third-strand oligonucleotides are modified to serve as either capture reagents or detection reagents for PCR products. Automated quantitative measurement of the PCR product is achieved by using latex bead-based fluorescence analysis. The use of triple-instead of double-helical interactions avoids the usual requirements of complex blocking reagents, time- and labor-intensive washing steps, and long times for color development. The method also provides rapid, sequence-specific capture and detection of PCR products without the need to denature the double-stranded PCR product. The assay is demonstrated with use of both PCR primer-derived and endogenous triple-helix-forming sequences resulting from PCR of several bacterial and viral target nucleic acids.


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M Clementi, S Menzo, P Bagnarelli, A Manzin, A Valenza, and P E Varaldo
Quantitative PCR and RT-PCR in virology.
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Copyright © 1992 by the American Association for Clinical Chemistry.