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Amplification-Free Strategy for miRNA Quantification in Human Serum Using Single Particle ICP-MS and Gold

Sara González Morales1,2, Carlos López-Portugués1,2, Manuel Fernández-Sanjurjo3,2

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A new method analyzes microRNAs (miRNAs) in plasma without amplification, correlating results with single-particle ICP-MS. This sensitive assay differentiates sedentary and athletic individuals based on miRNA biomarkers.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Analytical Chemistry

Background:

  • MicroRNAs (miRNAs) are key regulators of gene expression.
  • Altered miRNA levels are linked to diseases and physiological changes like exercise.
  • Accurate and sensitive miRNA detection is crucial for diagnostics.

Purpose of the Study:

  • To develop a novel, amplification-free analytical strategy for sensitive and specific miRNA detection in human plasma.
  • To quantify miRNA biomarkers for physiological changes, such as physical exercise.
  • To establish a versatile platform for diverse clinical applications.

Main Methods:

  • A direct quantification strategy using single-particle ICP-MS.
  • High-selectivity assay based on double hybridization with magnetic microparticle- and gold nanoparticle-conjugated oligonucleotides.
  • Elimination of the need to determine oligonucleotide-nanoparticle stoichiometry for quantification.

Main Results:

  • Sensitive and specific detection of miRNA sequences, distinguishing single nucleotide polymorphisms.
  • Direct correlation between detected events and miRNA quantity.
  • Successful application to identify a physical exercise biomarker in human serum, validated against rt-qPCR.
  • Achieved sensitivity allows differentiation between sedentary and sportive subjects.

Conclusions:

  • The developed method offers a sensitive, specific, and amplification-free approach for miRNA quantification.
  • This platform provides a significant advantage over existing methods by simplifying quantification.
  • The method is adaptable for various sequence targets, enabling broad clinical utility.