Rapid genotyping using pyrene−perylene locked nucleic acid complexes

Abstract

We have developed an assay for single strand DNA and RNA detection which is based on novel pyrene−perylene FRET pairs attached to short LNA/DNA probes. The assay is based on ratiometric emission upon binding of target DNA/RNA by three combinations of fluorescent LNA/DNA reporter strands. Specific geometry of the pyrene fluorophore attached to the 2′-amino group of 2′-amino-LNA in position 4 allows for the first time to efficiently utilize dipole−dipole orientation parameter for sensing of single-nucleotide polymorphisms (SNPs) in nucleic acid targets by FRET. Using novel probes, SNP detection is achieved with advantages of large Stokes shift (115 nm), high fluorescence quantum yields and low limit of target detection values (< 5 nM). Rapid and accurate genotyping of highly polymorphic HIV Pol cDNA and RNA fragments performed herein proves the possibility for broad application of the novel pyrene−perylene FRET pairs, e.g., in imaging and clinical diagnostics.

Keywords: :

• oligonucleotide
• LNA
• pyrene
• perylene
• fluorescence
• FRET
• SNP

Disclosure of Potential Conflicts of Interest

No potential conflicts of interest were disclosed.

Acknowledgments

The authors acknowledge financial support from The Villum Foundation and The Sapere Aude program of The Danish Council for Independent Research.

Supplemental Materials

Supplemental materials may be found here: http://www.landesbioscience.com/journals/artificialdna/article/25903