Harnessing crRNA Transformer for Facile and Specific Nucleic Acid Detection

Area of Science:

• Molecular Biology
• Biotechnology
• Genetics

Background:

• CRISPR/Cas systems show potential for nucleic acid detection but face limitations in specificity and require preprocessing.
• Existing methods often lack the sensitivity and specificity needed for direct clinical applications.

Purpose of the Study:

• To enhance the performance of CRISPR/Cas systems for nucleic acid detection.
• To develop a simplified, highly specific, and sensitive detection method.
• To explore the potential of crRNA structural modifications for improved CRISPR/Cas functionality.

Main Methods:

• Designed and synthesized two novel crRNA transformer structures: swap crRNA and split crRNA.
• Investigated the effect of these crRNA transformers on CRISPR/Cas system activity, including cis- and trans-cleavage.
• Assessed the DNA and RNA detection capabilities of the modified CRISPR/Cas systems.
• Applied the optimized system for the detection of clinical prostatic cancer markers.

Main Results:

• The novel crRNA transformers significantly enhanced specificity and reduced Cas binding affinity.
• The modified CRISPR/Cas systems demonstrated both DNA and RNA detection abilities.
• Achieved a one-step detection of clinical prostatic cancer with 90.0% sensitivity and 96.0% specificity.

Conclusions:

• CRISPR/Cas systems can be engineered with modified crRNAs (transformers) for superior nucleic acid detection.
• This strategy offers a promising approach for simple, highly specific, and sensitive molecular diagnostics.
• The developed method has significant potential for clinical molecular diagnosis, exemplified by prostatic cancer detection.