Small RNA-Sequencing for Analysis of Circulating miRNAs: Benchmark Study

Area of Science:

• Biochemistry
• Molecular Biology
• Genomics

Background:

• Circulating microRNAs (miRNAs) are promising biomarkers.
• Small RNA-sequencing (RNA-Seq) is widely used for miRNA profiling.
• Existing RNA-Seq protocols suffer from biases affecting quantification accuracy.

Purpose of the Study:

• To compare all commercially available small RNA-Seq library preparation methods for miRNA quantification in biofluids.
• To identify protocol-specific biases and their impact on miRNA profiling.
• To provide guidelines for selecting appropriate RNA-Seq methods in biomarker research.

Main Methods:

• Comparison of traditional two-adaptor ligation, randomized adaptors, polyadenylation, circularization, capture probes, and unique molecular identifier (UMI) methods.
• Utilized synthetic and human plasma samples for evaluation.
• Assessed performance across multiple metrics to identify strengths and weaknesses.

Main Results:

• No single small RNA-Seq protocol outperformed others across all evaluated metrics.
• Significant differences in measured miRNA profiles were observed between methods due to protocol-specific biases.
• Methods designed to minimize bias showed varied performance; UMIs had a negligible effect and could introduce errors if poorly designed.

Conclusions:

• Current small RNA-Seq library preparation methods possess distinct biases affecting miRNA quantification in biofluids.
• Understanding these protocol-specific biases is crucial for accurate miRNA biomarker research.
• The study provides essential insights for selecting optimal RNA-Seq strategies for miRNA profiling in clinical applications.