Exponential amplification reaction and triplex DNA mediated aggregation of gold nanoparticles for sensitive

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Shuangqin Wei1, Guifang Chen2, Xingqing Jia1

  • 1Department of Hepatology, Shanghai East Hospital, Tongji University School of Medicine, Shanghai, 200120, China.

Analytica Chimica Acta
|December 23, 2019
PubMed

Insights

A novel method detects microRNAs (miRNAs) using gold nanoparticles and exponential amplification. This simple, fast assay offers high selectivity and accuracy for disease diagnostics.

Area of Science:

  • Biomedical Engineering
  • Molecular Diagnostics
  • Nanotechnology

Background:

  • Aberrant microRNA (miRNA) expression is linked to various disease states.
  • Accurate and rapid miRNA detection is crucial for disease diagnosis and prognosis.
  • Existing detection methods can be complex and time-consuming.

Purpose of the Study:

  • To develop a sensitive and selective miRNA detection method.
  • To utilize exponential amplification reaction (EXPAR) and gold nanoparticle (AuNP) aggregation.
  • To enable rapid, point-of-care miRNA analysis.

Main Methods:

  • Conjugating AuNPs with EXPAR probes complementary to target miRNAs.
  • Utilizing EXPAR to form duplex DNA on AuNPs in the presence of target miRNA.
  • Inducing AuNP aggregation via triplex DNA formation for UV-vis quantification.

Main Results:

  • Achieved a detection limit of 0.23 µM for target miRNAs.
  • Demonstrated high selectivity and accuracy in miRNA detection.
  • Developed a one-tube assay completed in 30 minutes.

Conclusions:

  • The EXPAR and AuNP aggregation method provides a simple, fast, and accurate approach for miRNA detection.
  • This technique shows significant potential for point-of-care diagnostic applications.
  • The method addresses the need for efficient miRNA analysis in clinical settings.
Keywords:
Colorimetric methodExponential amplification reactionGold nanoparticlesMicroRNATriplex DNA

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