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We developed a microfluidic device for fast gene expression profiling in single cells using multiplexed quantitative polymerase chain reaction (qPCR). This technology enables precise analysis of microRNA expression, revealing cell heterogeneity and differentiation.

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Area of Science:

  • Biotechnology
  • Molecular Biology
  • Genomics

Background:

  • Single-cell analysis is crucial for understanding cellular heterogeneity.
  • Existing methods for gene expression profiling in single cells can be time-consuming and costly.
  • Multiplexed quantitative polymerase chain reaction (qPCR) offers high sensitivity but requires efficient sample handling.

Purpose of the Study:

  • To develop and validate a microfluidic device for rapid, high-throughput gene expression profiling in single cells.
  • To demonstrate the device's capability for multiplexed microRNA analysis in diverse cell types.
  • To assess the device's performance in revealing cell-to-cell variability and differentiation markers.

Main Methods:

  • Integration of cell isolation, lysis, cDNA synthesis, pre-amplification, sample splitting, and multiplexed qPCR on a microfluidic platform.
  • Parallel processing of up to 200 single cells per run.
  • Validation using purified RNA dilutions to assess linearity, precision, and sensitivity.

Main Results:

  • The microfluidic device demonstrated assay linearity over a dynamic range of at least 10^4.
  • Achieved qPCR precision of 15% and detection sensitivity down to a single cDNA molecule.
  • Successfully profiled microRNA expression in single cells, revealing significant cell-to-cell heterogeneity and distinct expression signatures indicative of spontaneous differentiation.

Conclusions:

  • Highly multiplexed microfluidic RT-qPCR provides a rapid, cost-effective solution for single-cell gene expression analysis.
  • The device complements genomics methods by enabling precise profiling of gene panels in hundreds of single cells.
  • This approach is expected to facilitate new studies requiring fast and precise measurements of gene expression heterogeneity.