Amplification-Free Detection of Highly Structured RNA Molecules Using SCas12aV2

Area of Science:

• Molecular Biology
• Biotechnology
• Genetics

Background:

• CRISPR/Cas12a systems offer powerful molecular diagnostics but often require pre-amplification for RNA detection.
• Existing SCas12a assays detect miRNA without amplification but struggle with long, structured RNA.
• Accurate quantification of diverse RNA targets remains a challenge in molecular diagnostics.

Purpose of the Study:

• To develop an enhanced CRISPR/Cas12a system (SCas12aV2) for direct RNA detection.
• To enable amplification-free quantification of long RNA molecules with complex secondary structures.
• To improve specificity for single-nucleotide polymorphism (SNP) detection.

Main Methods:

• Development of the SCas12aV2 system utilizing a split-crRNA approach with Cas12a.
• Preparation of the SCas12a system for direct RNA target detection.
• Application of SCas12aV2 for detecting RNA from clinical samples and distinguishing PAM-distal sites.

Main Results:

• SCas12aV2 efficiently detects long-chain RNA molecules with complex secondary structures.
• The system demonstrates high specificity in single-nucleotide polymorphism (SNP) applications.
• The entire experimental procedure is completed in under one hour.

Conclusions:

• SCas12aV2 advances CRISPR-based diagnostics by enabling direct, amplification-free RNA detection.
• The enhanced system broadens the scope of Cas12a applications to complex RNA and SNP analysis.
• SCas12aV2 offers a rapid and specific diagnostic tool for clinical RNA targets.