Abstract
Locked nucleic acid (LNA) and 2′-O-methyl nucleotide (OMeN) are the most extensively studied nucleotide analogues. Although both LNA and OMeN are characterized by the C3′-endo sugar pucker conformation, which is dominant in A-form DNA and RNA nucleotides, they demonstrate different binding behaviours. Previous studies have focused attention on their properties of duplex stabilities, hybridization kinetics and resistance against nuclease digestion; however, their ability to discriminate mismatched hybridizations has been explored much less. In this study, LNA- and OMeN-modified oligonucleotide probes have been prepared and their effects on the DNA duplex stability have been examined: LNA modifications can enhance the duplex stability, whereas OMeN modifications reduce the duplex stability. Next, we studied how the LNA:DNA and OMeN:DNA mismatches reduced the duplex stability. Melting temperature measurement showed that different LNA:DNA or OMeN:DNA mismatches indeed influence the duplex stability differently. LNA purines can discriminate LNA:DNA mismatches more effectively than LNA pyrimidines as well as DNA nucleotides. Furthermore, we designed five LNA- and five OMeN-modified oligonucleotide probes to simulate realistic situations where target–probe duplexes contain a complementary LNA:DNA or OMeN:DNA base pairs and a DNA:DNA mismatch simultaneously. The measured collective effect showed that the duplex stability was enhanced by the complementary LNA:DNA base pair but decreased by the DNA:DNA mismatch in a position-dependent manner regardless of the chemical identity and position of the complementary LNA:DNA base pair. On the other hand, the OMeN-modified probes also showed that the duplex stability was reduced by both the OMeN modification and the OMeN:DNA mismatch in a position-dependent manner.
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Abbreviations
- LNA:
-
locked nucleic acid
- MM:
-
mismatch
- OMeN:
-
2′-O-methyl nucleotide
- PM:
-
perfect match
- RT-PCR:
-
real-time polymerase chain reaction
- SNP:
-
single nucleotide polymorphism
References
Braasch DA and Corey DR 2001 Locked nucleic acid (LNA): fine-tuning the recognition of DNA and RNA. Chem. Biol. 8 1–7
Braasch DA, Liu Y and Corey DR 2002 Antisense inhibition of gene expression in cells by oligonucleotides incorporating locked nucleic acids: effect of mRNA target sequence and chimera design. Nucleic Acids Res. 30 5160–5167
Bondensgarrd K, Petersen M, Singh SK, Rajwanshi VK, Kumar R, Wengel J and Jacobsen JP 2000 Structural study of LNA:DNA duplex by NMR: conformation and implication for RNase H activity. Chem. Eur. J. 6 2687–2695
Burmeister PE, Lewis SD, Silva RF, Preiss JR, Horwitz LR, Pendergrast PS, McCauley TG, Kurz JC, Epstein DM, Wilson C and Keefe AD 2005 Direct In Vitro Selection of a 2’-O-Methyl Aptamer to VEGF. Chem. Biol. 12 25–33
Chen AK, Behlke MA and Tsourkas A 2009 Sub-cellular trafficking and functionality of 2’-O-methyl and 2’-O-methyl-phosphorothioate molecular beacons. Nucleic Acids Res. 37 e149
Chou LS, Meadows C, Wittwer CT and Lyon E 2005 Unlabeled oligonucleotide probes modified with locked nucleic acids for improved mismatch discrimination in genotyping by melting analysis. BioTechniques 39 644–647
Dominick PK and Jarstfer MB 2004 A conformationally constrained nucleotide analogue controls the folding topology of a DNA g-quadruplex. J. Am. Chem. Soc. 126 5050–5051
Kanai Y 2010 Genome-wide DNA methylation profiles in precancerous conditions and cancers. Cancer Sci. 101 36–45
Kaur H, Arora A, Wengel J and Maiti S 2006 Thermodynamic, counterion, and hydration effects for the incorporation of locked nucleic acid nucleotides into DNA duplexes. Biochemistry 45 7347–7355
Kaur H, Babu BR and Maiti S 2007 Perspectives on chemistry and therapeutic applications of Locked Nucleic Acid (LNA). Chem. Rev . 107 4672–4697
Kaur H, Wengel J and Mait S 2008 Thermodynamics of DNA-RNA Heteroduplex Formation: Effects of Locked Nucleic Acid Nucleotides Incorporated into the DNA Strand. Biochemistry 47 1218–1227
Kierzek E, Ciesielska A, Pasternak K, Mathews DH, Turner DH and Kierzek R 2005 The influence of locked nucleic acid residues on the thermodynamic properties of 2’-O-methyl RNA/RNA heteroduplexes. Nucleic Acids Res. 33 5082–5093
Kumar VA, and Ganesh KN 2007 Structure-Editing of Nucleic Acids for Selective Targeting of RNA. Curr. Top. Med. Chem. 7 715–726.
Johnson MP, Haupt LM and Griffith LR 2004 Locked nucleic acid (LNA) single nucleotide polymorphism (SNP) genotype analysis and validation using real-time PCR. Nucleic Acids Res. 32 e55
Laursen MB, Pakula MM, Gao S, Fluiter K, Mook OR, Baas F, Langklaer N, Wengel SL, Wengel J, Kjems J and Bramsen JB 2010 Utilization of unlocked nucleic acid (UNA) to enhance siRNA performance in vitro and in vivo. Mol. BioSyst. 6 862–870
Majlessi M, Nelson NC and Becker MM 1998 Advantages of 2’-O-methyl oligoribonucleotide probes for detecting RNA targets. Nucleic Acids Res.26 2224–2229
Naiser T, Kayser J, Mai T, Michel W and Ott A 2008 Position dependent mismatch discrimination on DNA microarrays - experiments and model. BMC Bioinformatics 9 509–520
Naiser T, Ehler O, Kayser J, Mai T, Michel W and Ott A 2008 Impact of point-mutations on the hybridization affinity of surface-bound DNA/DNA and RNA/DNA oligonucleotide-duplexes: comparison of single base mismatches and base bulges. BMC Biotechnology. 8 48–70
Nielsen KE, Singh SK, Wengel J and Jacobsen JP 2000 Solution Structure of an LNA Hybridized to DNA: NMR Study of the d (CTLGCTLTLCTLGC) : d(GCAGAAGCAG) Duplex Containing Four Locked Nucleotides. Bioconjugate. Chem. 11 228–238
Petersen M, Nielsen CB, Nielsen KE, Jensen GA, Bondensgaard K, Singh SK, Rajwanshi VK, Koshkin AA, Dahl BM, Wengel J and Jacobsen JP 2000 The conformations of locked nucleic acids (LNA). J. Mol. Recognit. 13 44–53
Piao XY, Sun LC, Zhang TB, Gan YL and Guan YF 2008 Effects of mismatches and insertions on discrimination accuracy of nucleic acid probes. Acta Biochim. Pol. 55 713–720
Tsourkas A, Behlke MA and Bao G 2003 Hybridization of 2’-O-methyl and 2’-deoxy molecular beacons to RNA and DNA targets. Nucleic Acids Res. 31 5168–5174
Ugozzoli LA, Latorra D, Puckett R, Arar K and Hamby K 2004 Real-time genotyping with oligonucleotide probes containing locked nucleic acids. Anal. Biochem. 324 143–152
Vester B and Wengel B 2004 LNA (Locked Nucleic Acid): High-Affinity Targeting of Complementary RNA and DNA. Biochemistry 43 13233–13241
Wilson C and Keefe AD 2006 Building oligonucleotide therapeutics using non-natural chemistries. Curr. Opin. Chem. Biol. 10 607–614
Zhen G, Liu QH and Smith LM 1997 Enhanced discrimination of single nucleotide polymorphisms by artificial mismatch hybridization. Nat. Biotechnol. 15 331–335
Acknowledgements
The authors are grateful for the financial support to YG from the National Natural Science Foundation of China (No. 31070705) and to YY from the Postdoctoral Research Grant of Ministry of Education (20081042).
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Corresponding editor: Basuthkar J Rao
[Yan Y, Yan J, Piao X, Zhang T and Guan Y 2012 Effect of LNA- and OMeN-modified oligonucleotide probes on the stability and discrimination of mismatched base pairs of duplexes. J. Biosci. 37 XXX–XXX] DOI 10.1007/s12038-012-9196-4
[Yan Y Yan J, Piao X, Zhang T and Guan Y 2012 Effect of LNA- and OMeN-modified oligonucleotide probes on the stability and discrimination of mismatched base pairs of duplexes. J. Biosci. 37 DOI 10.1007/s12038-012-9196-4]
Ying Yan and Jing Yan contributed equally.
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Yan, Y., Yan, J., Piao, X. et al. Effect of LNA- and OMeN-modified oligonucleotide probes on the stability and discrimination of mismatched base pairs of duplexes. J Biosci 37, 233–241 (2012). https://doi.org/10.1007/s12038-012-9196-4
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DOI: https://doi.org/10.1007/s12038-012-9196-4