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Real-time reverse transcription-polymerase chain reaction, or Real-time RT-PCR, is an analytical tool used to determine the expression level of target genes. The method involves converting mRNA to complementary DNA with the help of an enzyme known as reverse transcriptase, followed by the PCR amplification of the cDNA. These two processes can be performed simultaneously in a single tube or separately as a two-step reaction.
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A Prototype Biomarker Detector Combining Biomarker Extraction and Fixed Temperature PCR.

Patricia K Russ1, Aditya V Karhade1, Anna L Bitting2

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|February 28, 2016
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Summary

This study presents a simple, low-cost instrument for infectious disease diagnosis using Polymerase Chain Reaction (PCR). The device integrates nucleic acid extraction and PCR amplification for sensitive detection of biomarkers in resource-limited settings.

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Area of Science:

  • Molecular Diagnostics
  • Biomedical Engineering
  • Infectious Disease Research

Background:

  • Polymerase Chain Reaction (PCR) is a highly sensitive molecular diagnostic tool for infectious diseases.
  • Developing simple, inexpensive instruments for low-resource settings remains a key challenge.
  • Previous work established a self-contained instrument for nucleic acid extraction and isothermal amplification.

Purpose of the Study:

  • To integrate Polymerase Chain Reaction (PCR) thermal cycling into a previously developed self-contained molecular diagnostic instrument.
  • To evaluate the instrument's performance for detecting tuberculosis and malaria biomarkers.
  • To assess the potential of this integrated system as a low-resource diagnostic tool.

Main Methods:

  • Magnetic extraction of biomarkers from patient samples within thin tubing.
  • Integration of PCR reagents and thermal cycling by alternating tubing position between two constant temperature blocks.
  • Evaluation using a 140 bp IS6110 sequence fragment from tuberculosis and Plasmodium falciparum DNA from malaria-infected blood cultures.

Main Results:

  • Successful amplification of tuberculosis IS6110 sequence with a mean cycle threshold of 25.5 ± 1.5 for 5 × 10(6) copies, significantly different from negative controls (34.0 ± 2.6).
  • Significant amplification of Plasmodium falciparum DNA from malaria samples with an average cycle threshold of 24.7 ± 1.5 for 1% parasitemia, distinct from negatives (31.5 ± 2.1).
  • Demonstrated integration of biomarker extraction, PCR amplification, and detection in a linear tubing design.

Conclusions:

  • The developed instrument successfully integrates nucleic acid extraction and PCR amplification for biomarker detection.
  • The system shows promise as a simple, cost-effective diagnostic tool for infectious diseases in low-resource settings.
  • This linear, integrated approach offers a viable solution for molecular diagnostics where advanced instrumentation is unavailable.