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High Throughput MicroRNA Profiling: Optimized Multiplex qRT-PCR at Nanoliter Scale on the Fluidigm Dynamic ArrayTM IFCs
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Protocol for miRNA isolation from biofluids.

Evgeny A Lekchnov1, Ivan A Zaporozhchenko2, Evgeny S Morozkin2

  • 1Institute of Chemical Biology and Fundamental Medicine of SB RAS, Novosibirsk 630090, Russia.

Analytical Biochemistry
|February 14, 2016
PubMed
Summary

This study presents a novel, cost-effective protocol for isolating microRNAs (miRNAs) from biofluids like blood plasma and urine. The new method is more effective than existing techniques, especially for urine samples, offering a simpler alternative for biomarker research.

Keywords:
Cell-free miRNAPlasmaUrinemiRNA isolation

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Biomarker Discovery

Background:

  • MicroRNAs (miRNAs) are crucial biomarkers for diseases, but their isolation from biofluids is challenging due to protective packaging.
  • Existing cell-free RNA isolation methods are often expensive, labor-intensive, or use hazardous chemicals.

Purpose of the Study:

  • To develop and validate a new, efficient protocol for isolating miRNAs from biofluids such as blood plasma and urine.
  • To compare the efficacy of the proposed protocol against conventional methods.

Main Methods:

  • The protocol involves protein precipitation, denaturation of miRNA complexes using octanoic acid and guanidine isothiocyanate, and purification using spin columns.
  • Quantitative reverse-transcription PCR (qRT-PCR) was used to assess miRNA extraction efficiency for miR-16 and miR-126.
  • Spectrophotometry and SDS-PAGE were employed to analyze protein content and compare precipitation mechanisms.

Main Results:

  • The proposed protocol demonstrated slightly higher miRNA isolation efficiency from plasma compared to phenol-chloroform extraction and the miRCURY RNA isolation kit.
  • The new protocol was significantly more effective for miRNA isolation from urine than the other two tested methods.
  • Differences in protein precipitation mechanisms likely explain the performance variations observed between the methods.

Conclusions:

  • The developed protocol offers an effective and potentially more accessible method for miRNA isolation from biofluids, particularly urine.
  • This improved isolation technique can facilitate advancements in miRNA-based diagnostics and research.
  • The findings highlight the importance of considering protein precipitation mechanisms in miRNA isolation strategies.