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Real-time amplification and high resolution melt analysis on a rapid microfluidic instrument.

Renna L Nouwairi1, Killian C O'Connell1, Rachelle A Turiello1

  • 1Department of Chemistry, University of Virginia, Charlottesville, VA, USA.

Analytica Chimica Acta
|April 27, 2025
PubMed
Summary

This study integrates high-resolution melt (HRM) analysis into a rapid microfluidic real-time amplification system. The enhanced platform now differentiates nucleic acid sequences and non-specific amplification in under 4 minutes, accelerating genomic analysis.

Keywords:
High Resolution Melt AnalysisLoop-Mediated Isothermal AmplificationMicrofluidicsPolymerase Chain ReactionRecombinase Polymerase Amplification

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Area of Science:

  • Molecular Biology
  • Biotechnology
  • Genomics

Background:

  • Real-time nucleic acid amplification requires post-amplification analysis for sequence identification and to differentiate specific from non-specific amplification (NSA).
  • Conventional methods like sequencing and electrophoresis are labor-intensive, time-consuming, and require additional expensive reagents and consumables.
  • High-resolution melt (HRM) analysis offers a simpler alternative for sequence differentiation and NSA detection without extra instrumentation or reagents.

Purpose of the Study:

  • To expand the capability of a microfluidic real-time amplification system to include post-amplification HRM analysis.
  • To demonstrate sequence differentiation and the ability to distinguish specific from non-specific amplification using the integrated system.

Main Methods:

  • Integration of HRM analysis into a previously developed 8-minute microfluidic real-time amplification system.
  • Utilizing PCR for detecting epigenetic targets with varying methylation percentages.
  • Coupling HRM with isothermal amplification methods (LAMP, RPA) to identify true positive results and mitigate primer noise-induced NSA.

Main Results:

  • The microfluidic platform successfully performed HRM analysis in under 4 minutes post-amplification.
  • Sequence differentiation was achieved for epigenetic targets.
  • HRM effectively distinguished true positive results from non-specific amplification in isothermal methods like LAMP and RPA.
  • Microfluidic system performance was comparable to conventional instrumentation but required a fraction of the analysis time.

Conclusions:

  • The modified microfluidic platform enables rapid (under 4 minutes) HRM analysis for sequence mutation differentiation and NSA elucidation.
  • This integration enhances the platform's applicability for point-of-need applications, such as clinical diagnostics, demanding rapid and accurate genomic analysis.