Abstract
Synthetic oligonucleotides can cause specific inhibition of gene expression by a variety of mechanisms (e.g., antigene, antisense, siRNA). Such oligonucleotides can also cause catalytic cleavage of the target sequence (e.g., ribozyme, DNAzyme) and selectively bind to the target molecules (e.g., aptamers). However, oligonucleotides possess unfavorable pharmacokinetic and pharmacodynamic properties, like extremely short plasma half-life due to the degradation by nucleases, low cellular uptake, and poor target specificity. These unfavorable properties can be improved by either incorporating structural modifications in oligonucleotide or by conjugating (covalently linking) molecules with relevant biological properties (e.g., peptides and proteins, carbohydrates, antibodies, enzymes, polymers, drugs, fluorophores) to oligonucleotide. The conjugate design usually aims to improve the poor pharmacokinetic and pharmacodynamic properties of the unmodified oligonucleotide and, in some cases, to impart new properties to the oligonucleotide. Over the years, a very large number of diverse oligonucleotide conjugates have been developed and evaluated for diagnostic, therapeutic, and nanotechnology-based applications. The aim of this chapter is to describe the underlying reasons and challenges in oligonucleotide conjugate design, provide an overview of chemical approaches available for their synthesis, and highlight some of their recent applications.
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- AMD:
-
Age-related macular degeneration
- COC:
-
Carbohydrate–oligonucleotide conjugate
- CMV:
-
Cytomegalovirus
- CPG:
-
Controlled pore glass
- CPP:
-
Cell-penetrating peptide
- DCC:
-
Dicyclohexyl carbodiimide
- Dde:
-
1-(4,4-Dimethyl-2,6-dioxacyclohexylidene)ethyl
- DMT:
-
4,4′-Dimethoxy trityl
- DNA:
-
Deoxyribonucleic acid
- DTPA:
-
Dithiol phosphoramidite
- DTT:
-
Dithiothreitol
- EDC:
-
1-Ethyl-3-(3-dimethylaminopropyl) carbodiimide
- FISH:
-
Fluorescence in situ hybridization
- FO:
-
Fluorescent oligonucleotide
- HBTU:
-
2-(1H-Benzotriazol-1-yl)-1,1,3,3-tetramethyluronium hexafluorophosphate
- HNA:
-
Hexitol nucleic acid
- HOBT:
-
1-Hydroxybenzotriazole
- HPLC:
-
High-performance liquid chromatography
- LCAA:
-
Long-chain alkyl amino
- LNA:
-
Locked nucleic acid
- LOC:
-
Lipid-oligonucleotide conjugate
- MCOC:
-
Metal complex–oligonucleotide conjugate
- MMT:
-
4-Monomethoxy trityl
- NHS:
-
N-Hydroxysuccinimidyl ester
- NOC:
-
Nanoparticle–oligonucleotide conjugate
- ON:
-
Oligonucleotide
- PEG:
-
Poly(ethylene glycol)
- PNA:
-
Peptide nucleic acid
- POC:
-
Peptide–oligonucleotide conjugate
- QCMS:
-
Quartz crystal microbalance
- QD:
-
Quantum dots
- RES:
-
Reticuloendothelial system
- RNA:
-
Ribonucleic acid
- SAM:
-
Self-assembled monolayer
- SERS:
-
Surface enhanced Raman scattering
- shRNA:
-
Small hairpin ribonucleic acid
- siRNA:
-
Small interfering ribonucleic acid
- SMPT:
-
N-Succinimidylocarbonyl-methyl-(2-pyridyldithio) toluene
- SNALP:
-
Stable nucleic acid lipid particle
- SPDP:
-
N-Succinimidyl 3-(2-pyridyldithio) propionate
- SPR:
-
Surface plasmon resonance
- TCEP:
-
Tris(2-carboxyethyl) phosphine
- TOF-SIMS:
-
Time-of-flight secondary ion mass spectrometry
- Tr:
-
Trityl
- VEGF:
-
Vascular endothelial growth factor
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Acknowledgments
We gratefully acknowledge our students, postdoctoral fellows, and colleagues who contributed to this work. Financial support to Prof. Eric Defrancq came from Cluster Région Rhone-Alpes, the Centre National pour la Recherche Scientifique (CNRS), and Université Joseph Fourier Grenoble 1. Dr. Yashveer Singh is supported by grant from NIH HIT-IT program (R01AI084137-01) to Prof. Patrick J. Sinko (PI).
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Singh, Y., Murat, P., Spinelli, N., Defrancq, E. (2012). Oligonucleotide Conjugates: Rationale, Synthesis, and Applications. In: Erdmann, V., Barciszewski, J. (eds) From Nucleic Acids Sequences to Molecular Medicine. RNA Technologies. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-27426-8_5
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