Integrating whole transcriptome assays on a lab-on-a-chip for single cell gene profiling

Area of Science:

• Molecular Biology
• Genomics
• Biotechnology

Background:

• Single-cell analysis is crucial for understanding complex biological processes.
• Gene expression profiling requires efficient reverse transcription (RT) of RNA to complementary DNA (cDNA).
• Conventional RT methods in microlitre volumes have limitations in sensitivity and efficiency.

Purpose of the Study:

• To develop and evaluate a novel microfluidic method for enhanced reverse transcription (RT) of RNA.
• To compare the sensitivity and efficiency of the microfluidic RT approach against conventional protocols.
• To demonstrate the utility of the microfluidic method for single-cell gene expression profiling.

Main Methods:

• A microfluidic system was developed to manipulate nanolitre volumes for reverse transcription (RT).
• The microfluidic RT protocol was compared to conventional tube-based methods using mouse brain RNA.
• Single neuronal progenitors were analyzed using an on-chip cell capture, lysis, and RT workflow followed by template-switching PCR (TS-PCR).

Main Results:

• The microfluidic protocol detected 74% of expressed genes in mouse brain RNA, compared to only 4% with conventional methods.
• Analysis of single neuronal progenitors using the microfluidic approach detected a mean of 5000 genes per cell.
• This demonstrates a significant increase in sensitivity and comprehensiveness of gene detection.

Conclusions:

• The novel microfluidic method offers a substantial improvement in reverse transcription efficiency for gene expression analysis.
• This technique is highly effective for comprehensive profiling of gene expression at the single-cell level.
• The microfluidic approach provides outstanding sensitivity for detecting expressed genes in individual cells.