An Ultrasensitive Nucleic Acid Detection Platform Based on Phosphorothioate-DNA

Area of Science:

• Molecular Biology
• Biotechnology
• Diagnostic Assays

Background:

• Nucleic acid detection is crucial for disease diagnosis and epidemic control.
• Existing methods often suffer from lengthy procedures and suboptimal accuracy.
• Limited research has explored DNA modifications for nucleic acid detection platforms.

Purpose of the Study:

• To develop an advanced nucleic acid detection platform, SENSOR 2.0, building upon previous work.
• To expand detection capabilities to RNA with single-copy sensitivity.
• To enable the identification of single nucleotide variations (SNVs) using a novel probe design.

Main Methods:

• Utilized the SENSOR (sulfur DNA-mediated nucleic acid sensing platform) framework.
• Incorporated phosphorothioate (PT) modification and sulfur binding domains (SBDs).
• Employed a Bubble-Probe design for enhanced specificity and SNV discrimination.
• Applied SENSOR 2.0 to clinical samples for mutation detection.

Main Results:

• Achieved single-copy level sensitivity for RNA detection.
• Demonstrated the ability to distinguish single nucleotide variations (SNVs).
• Successfully identified azole drug-resistant point mutations in the ERG11 gene within 57 clinical Candida albicans samples.

Conclusions:

• SENSOR 2.0 represents a significant advancement in nucleic acid detection technology.
• The platform offers high sensitivity and specificity for both RNA detection and SNV identification.
• SENSOR 2.0 is a powerful and innovative tool for clinical diagnostics and molecular analysis.