Ultrasensitive PCR and real-time detection from human genomic samples using a bidirectional flow microreactor

Area of Science:

• Biotechnology
• Microfluidics
• Genomic Analysis

Background:

• Conventional DNA amplification methods face challenges with surface inhibition and efficiency.
• Microfluidic devices offer potential for miniaturized and efficient DNA analysis.
• Flow-through PCR systems have historically struggled to balance performance characteristics.

Purpose of the Study:

• To present a reliable bidirectional flow DNA amplification microreactor.
• To improve PCR compatibility and reduce surface inhibitory effects in microreactors.
• To enable real-time monitoring of DNA amplification in a microfluidic format.

Main Methods:

• Utilized a bidirectional flow microreactor design.
• Implemented silanization with dimethyldichlorosilane and dynamic surface passivation.
• Integrated epimodal fluorescent detection for real-time monitoring.
• Processed real-world genomic samples.

Main Results:

• Achieved an ultrasensitive RNase P gene detection limit of 24 human genome copies.
• Demonstrated a reaction efficiency of 77% for the bidirectional flow system.
• Showcased performance comparable to conventional real-time PCR instruments (93% efficiency).

Conclusions:

• The bidirectional flow microreactor effectively overcomes surface inhibition issues.
• This system revitalizes flow-through PCR for lab-on-a-chip DNA analysis.
• The developed microreactor offers a viable and sensitive platform for genomic sample processing.