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Related Experiment Video

Updated: Apr 5, 2026

Aptamer-Based Target Detection Facilitated by a 3-Stage G-Quadruplex Isothermal Exponential Amplification Reaction
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Triplex DNA: A new platform for polymerase chain reaction-based biosensor.

Yubin Li1, Xiangmin Miao2, Liansheng Ling1

  • 1School of Chemistry and Chemical Engineering, Sun Yat-Sen University, Guangzhou 510275, P. R. China.

Scientific Reports
|August 14, 2015
PubMed
Summary
This summary is machine-generated.

This study presents a novel sensor for thrombin detection using sequence-specific recognition and molecular beacons. The method effectively overcomes challenges of non-specific amplification and DNA contamination in PCR assays.

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Area of Science:

  • Biotechnology
  • Molecular Diagnostics
  • Biosensor Development

Background:

  • Polymerase Chain Reaction (PCR) is prone to non-specific amplification and DNA contamination, limiting its diagnostic accuracy.
  • Accurate detection of biomarkers like thrombin is crucial for various medical applications.
  • Existing methods often struggle with sensitivity and specificity in complex biological samples.

Purpose of the Study:

  • To develop a novel sensor for sensitive and specific thrombin detection.
  • To address and overcome limitations of non-specific amplification and DNA contamination in PCR-based assays.
  • To utilize molecular beacon technology combined with triplex formation for enhanced recognition.

Main Methods:

  • Design of two probes (Probe A and Probe B) for sequence-specific thrombin recognition.
  • Enzymatic extension of Probe B using Klenow Fragment polymerase and dNTPs upon thrombin binding.
  • PCR amplification using Taq DNA Polymerase and primers, followed by molecular beacon detection via triplex formation.

Main Results:

  • The sensor demonstrated a linear response to thrombin concentration on a logarithmic scale from 1.0 × 10⁻¹² M to 1.0 × 10⁻⁷ M.
  • Achieved a low detection limit of 261 fM for thrombin.
  • Successfully minimized the impact of DNA contamination and non-specific amplification.

Conclusions:

  • The proposed sensor offers a robust and highly sensitive method for thrombin detection.
  • Sequence-specific recognition via triplex formation effectively enhances specificity and overcomes PCR-related interferences.
  • This strategy holds significant potential for reliable molecular diagnostics.