Highly Sensitive and Robust Detection of Human Telomerase Based on Strand-Displacement Cascade Amplification

Area of Science:

• Biomedical Engineering
• Nanotechnology
• Electrochemistry

Background:

• Telomerase is a key biomarker for early cancer detection.
• Existing telomerase sensing methods have limitations in sensitivity and practicality.
• Novel diagnostic tools are needed for efficient cancer screening.

Purpose of the Study:

• To develop a novel electrochemical sensing strategy for telomerase detection.
• To integrate strand displacement cascade amplification with DNA nanostructures for signal enhancement.
• To create a sensitive, selective, and stable platform for cancer screening and telomerase inhibitor studies.

Main Methods:

• Fabrication of a sensing platform using modified magnetic nanocomposites and electrodes.
• Utilizing three-dimensional DNA nanostructures for signal immobilization.
• Employing strand displacement cascade amplification for signal amplification.
• Electrochemical detection of telomerase activity.

Main Results:

• The developed electrochemical method demonstrated high sensitivity, selectivity, and stability.
• The method showed utility in screening telomerase inhibitors.
• The assay successfully discriminated between tumor cells.
• Validation with human urine samples showed concordance with clinical diagnoses.

Conclusions:

• The novel DNA nanostructure-based electrochemical method provides a sensitive and reliable approach for telomerase detection.
• This method holds significant potential as a point-of-care testing tool for early cancer screening.
• The platform is applicable for telomerase inhibitor screening and tumor cell discrimination.