PRICE: direct and robust detection of microRNAs at single-nucleotide resolution

Area of Science:

• Biotechnology
• Molecular Biology
• Genomics

Background:

• Accurate microRNA (miRNA) single-nucleotide discrimination is crucial for understanding disease mechanisms, as minor sequence variations impact phenotypes.
• Current methods for detecting single nucleotide variations (SNVs) in miRNAs are often limited to specific loci and lack sensitivity.
• Developing sensitive and versatile tools for miRNA SNV detection is essential for clinical applications.

Purpose of the Study:

• To present a generalized peptide nucleic acid (PNA) mediated CRISPR/Cas13a system (PRICE) for sensitive and specific detection of SNVs in miRNA sequences.
• To demonstrate the capability of PRICE to differentiate between miRNA variants with single nucleotide differences without amplification.
• To establish PRICE as a versatile platform for precise miRNA analysis in clinical settings.

Main Methods:

• The PRICE system employs peptide nucleic acid (PNA) blockers designed to hybridize with non-target miRNA sequences containing specific SNVs.
• Cas13a, guided by crRNA, is activated only by unhybridized target miRNA, leading to the cleavage of a fluorescent reporter-quencher.
• The system operates without amplification, achieving a detection limit of approximately 10 femtomolar (fM).

Main Results:

• The PRICE system successfully enables sensitive detection of SNVs in miRNA sequences.
• The PNA blockers effectively inhibit non-target miRNAs, ensuring specificity in detection.
• A detection limit of ~10 fM was achieved, demonstrating high sensitivity without amplification.

Conclusions:

• The PRICE system offers a versatile, amplification-free platform for precise miRNA analysis, crucial for advancing cancer diagnosis, prognosis, and biological studies.
• PRICE's ability to detect SNVs in miRNAs with high sensitivity and specificity addresses limitations of existing techniques.
• This PNA-mediated CRISPR/Cas13a approach holds significant potential for clinical diagnostics and miRNA research.