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Related Experiment Video

Updated: Jun 15, 2026

Cerebrospinal Fluid MicroRNA Profiling Using Quantitative Real Time PCR
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Cerebrospinal Fluid MicroRNA Profiling Using Quantitative Real Time PCR

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Improved microRNA quantification in total RNA from clinical samples.

Ditte Andreasen1, Jacob U Fog, William Biggs

  • 1Exiqon A/S, Skelstedet 16, DK-2950 Vedbaek, Denmark. ina@exiqon.com

Methods (San Diego, Calif.)
|March 11, 2010
PubMed
Summary

Locked Nucleic Acid (LNA)-enhanced qPCR allows accurate microRNA detection in scarce clinical samples like FFPE tissues and blood plasma. This method improves biomarker screening and quantification from challenging sample types.

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Area of Science:

  • Molecular Biology
  • Biochemistry
  • Genomics

Background:

  • microRNAs (miRNAs) are key regulatory molecules with potential as disease biomarkers.
  • Accurate miRNA quantification is crucial for clinical applications but challenging in limited samples like FFPE and plasma.
  • Existing methods face difficulties in reliably detecting miRNAs in these sample types.

Purpose of the Study:

  • To evaluate a novel Locked Nucleic Acid (LNA)-enhanced quantitative polymerase chain reaction (qPCR) method for miRNA detection.
  • To assess the utility of LNA-based miRNA qPCR for biomarker screening in scarce clinical samples.
  • To investigate methods for improving miRNA quantification in challenging sample matrices.

Main Methods:

  • Development and application of LNA-enhanced primers for miRNA qPCR.

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  • Analysis of microRNAs from formalin-fixed paraffin-embedded (FFPE) samples using LNA-based qPCR and microarray.
  • Comparison of miRNA quantification with and without carrier RNA addition in blood plasma and laser capture microdissected (LCM) FFPE samples.

    • Main Results:

    • LNA-based miRNA qPCR demonstrated accurate and reproducible quantification of miRNAs in low-input FFPE samples.
    • Results from LNA-based qPCR correlated with microarray data.
    • Addition of carrier RNA significantly improved miRNA quantification in plasma and LCM-derived FFPE samples.

    Conclusions:

    • LNA-enhanced miRNA qPCR is a robust method for biomarker screening in challenging clinical samples.
    • The method enables reliable miRNA quantification even with limited RNA input.
    • Carrier RNA addition is a valuable strategy to enhance miRNA recovery and detection in plasma and FFPE samples.