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Updated: May 21, 2026
14:15
Highly Efficient Ligation of Small RNA Molecules for MicroRNA Quantitation by High-Throughput Sequencing
Published on: November 18, 2014
Non-enzymatic conversion of RNA sequence information into DNA by squaramide ligation for accurate RNA quantification
Lapatrada Taemaitree1,2, Friedrich Burba1, Nina Harvey3
1Department of Chemistry, University of Oxford, Chemistry Research Laboratory, Oxford, UK.
Communications Chemistry
|May 19, 2026
Summary
Researchers developed a novel chemical ligation method to quantify fragile RNA biomarkers. This technique converts RNA into DNA, enabling sensitive detection down to sub-attomole levels for improved diagnostics and research.
Area of Science:
- Biochemistry
- Molecular Biology
- Chemical Biology
Background:
- Ribonucleic acid (RNA) is a crucial biomarker in research and diagnostics.
- RNA's instability necessitates conversion to deoxyribonucleic acid (DNA) for detection.
- Existing enzymatic methods are limited by biological constraints, and chemical methods lack competitiveness.
Purpose of the Study:
- To develop a sensitive and specific chemical ligation method for RNA quantification.
- To overcome the limitations of current RNA detection techniques.
- To enable the detection of RNA in complex biological systems.
Main Methods:
- Chemical ligation of DNA oligonucleotides hybridized to an RNA template.
- Formation of an artificial squaramide backbone for RNA quantification.
- Utilized a three-component ligation system designed to minimize false-positives.
- Integrated the method with quantitative polymerase chain reaction (qPCR) for RNA detection.
Main Results:
- Achieved quantification of sub-attomole quantities of RNA.
- Demonstrated high sensitivity with detection limits as low as 0.3 attomoles.
- The reaction proceeds efficiently in mildly buffered, monovalent salt solutions without extra reagents.
- Successful application in qPCR for detecting long RNAs in complex systems.
Conclusions:
- The developed chemical ligation system offers a sensitive and specific alternative for RNA quantification.
- This method bypasses biological constraints associated with enzymatic approaches.
- It represents a significant advancement in chemical ligation techniques for biomarker detection.
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