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MiRNA detection at single-cell resolution using microfluidic LNA flow-FISH.

Meiye Wu1, Matthew E Piccini, Anup K Singh

  • 1Biological Science and Technology, Sandia National Laboratories, MS 9292, 969, Livermore, CA, 94551-0969, USA.

Methods in Molecular Biology (Clifton, N.J.)
|September 15, 2014
PubMed
Summary
This summary is machine-generated.

This study presents a microfluidic flow-FISH method for detecting microRNAs (miRNAs) in single cells. The technique allows simultaneous detection of RNA and proteins, offering a powerful tool for cellular analysis.

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Area of Science:

  • Biotechnology
  • Molecular Biology
  • Cell Biology

Background:

  • Flow cytometry combined with fluorescent in situ hybridization (flow-FISH) enables rapid nucleic acid detection at single-cell resolution.
  • Traditional methods often require cell homogenization or nucleic acid extraction, limiting analysis of intact cells.
  • Advances in microfluidics and probe technology offer new possibilities for high-resolution cellular analysis.

Purpose of the Study:

  • To describe a novel microfluidic-based method for detecting microRNAs (miRNAs) in single, intact cells using flow-FISH.
  • To demonstrate the versatility of the method for analyzing various RNA species and multiplexing with protein detection.
  • To provide practical guidance for setting up the microfluidic system for flow cytometry analysis.

Main Methods:

  • Development of a microfluidic chip for single-cell analysis.
  • Utilizing locked nucleic acid (LNA)-containing probes for enhanced hybridization efficiency.
  • Integration of flow-FISH with protein immunostaining for multiplexed analysis.
  • Application to PMA and ionomycin-stimulated Jurkat cells for detecting miR155 and CD69 protein.

Main Results:

  • Successful detection of specific microRNAs (e.g., miR155) in single, intact cells.
  • Demonstration of simultaneous detection of miRNA and protein (e.g., CD69) within the same cell.
  • Validation of the method's applicability to mRNA and small noncoding RNA detection.
  • Establishment of a microfluidic sample preparation workflow compatible with standard and custom flow cytometers.

Conclusions:

  • The described microfluidic flow-FISH method provides a powerful, streamlined approach for single-cell RNA analysis.
  • This technique eliminates the need for cell lysis or RNA extraction, preserving cellular integrity.
  • The ability to multiplex RNA and protein detection opens new avenues for comprehensive cellular profiling and biomarker discovery.