Chemical additives-enhanced CRISPR/Cas12a-based RNA detection

Area of Science:

• Molecular Biology
• Biotechnology
• Diagnostics

Background:

• CRISPR/Cas12a systems offer programmable nucleic acid detection.
• Current Cas12a assays struggle with sensitive direct RNA detection, often requiring DNA activators or complex steps.
• Existing RNA detection methods are limited to nanomolar sensitivity.

Purpose of the Study:

• To develop a highly sensitive and simplified CRISPR/Cas12a-based RNA detection method.
• To overcome the sensitivity limitations of direct RNA detection using Cas12a.
• To create an amplification-free diagnostic framework for RNA and ssDNA.

Main Methods:

• A novel chemical additive-enhanced CRISPR/Cas12a-based RNA detection (CARD) strategy was developed.
• The method utilizes a single crRNA and chemical additives for enhanced trans-cleavage activity.
• The system was adapted for single-stranded DNA (ssDNA) detection.

Main Results:

• Achieved femtomolar-level sensitivity for direct RNA detection.
• Demonstrated attomolar-level sensitivity for single-stranded DNA detection.
• Eliminated the need for DNA activators, reverse transcription, or strand-displacement reactions.

Conclusions:

• CARD provides a simple, amplification-free, and highly sensitive diagnostic framework.
• This method significantly enhances CRISPR/Cas12a-based RNA detection capabilities.
• The CARD strategy holds potential for broader application in ultrasensitive nucleic acid diagnostics.