Small RNA-Sequencing: Approaches and Considerations for miRNA Analysis

Area of Science:

• Molecular Biology
• Biochemistry
• Genomics

Background:

• MicroRNAs (miRNAs) are key regulators in health and disease, detectable in biofluids as non-invasive biomarkers.
• Small RNA sequencing (RNA-seq) provides genome-wide miRNA profiling, including novel variants and low-input samples like liquid biopsies.
• Technical biases in current RNA-seq methods limit accurate miRNA representation and diagnostic potential.

Purpose of the Study:

• To review current cDNA library construction approaches for small RNA sequencing.
• To focus on the implementation of these methods in commercially available protocols.
• To provide guidelines for selecting appropriate RNA-seq protocols for miRNA research.

Main Methods:

• Comprehensive review of existing small RNA sequencing protocols for cDNA library construction.
• Analysis of protocol applicability and performance based on published benchmarking studies.
• Focus on commercially available small RNA sequencing kits.

Main Results:

• Significant variability exists in the performance of different small RNA sequencing protocols.
• Protocols exhibit distinct strengths and weaknesses, influencing their suitability for specific miRNA research applications.
• Benchmarking studies reveal challenges in capturing true miRNA representation due to technical biases.

Conclusions:

• Optimizing cDNA library construction is crucial for minimizing bias in small RNA sequencing.
• Understanding protocol-specific performance is essential for reliable miRNA biomarker discovery and diagnostics.
• This review offers a guide to selecting appropriate small RNA sequencing approaches for miRNA research.