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Related Concept Videos

Real Time RT-PCR02:57

Real Time RT-PCR

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.
The real-time quantification of the number of amplified products is...
DNA Microarrays02:34

DNA Microarrays

Microarrays are high-throughput and relatively inexpensive assays that can be automated to analyze large quantities of data at a time. They are used in genome-wide studies to compare gene or protein expression under two varied conditions, such as healthy and diseased states. Microarrays consist of glass or silica slides on which probe molecules are covalently attached through surface functionalization. Most commonly, the slides are prepared through the chemisorption of silanes to silica...
PCR01:32

PCR

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Development of a temperature sensor array chip and a chip-based real-time PCR machine for DNA amplification

D S Lee1, C S Chen

  • 1Department of Energy and Refrigerating Air Conditioning Engineering, National Taipei University of Technology, Taipei, Taiwan. f11167@ntut.edu.tw

Biosensors & Bioelectronics
|November 29, 2007
PubMed
Summary
This summary is machine-generated.

A novel chip-based real-time polymerase chain reaction (PCR) machine enables absolute quantification of Hepatitis B virus (HBV) DNA without a standard curve. This method uses temperature and fluorescence monitoring for accurate DNA amplification efficiency estimation.

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Area of Science:

  • Biotechnology
  • Molecular Biology
  • Medical Diagnostics

Background:

  • Accurate quantification of viral DNA is crucial for disease management.
  • Traditional real-time PCR methods often require standard curves for absolute quantification.
  • Monitoring thermal cycling and amplification in real-time can improve PCR efficiency estimation.

Purpose of the Study:

  • To develop a chip-based real-time PCR system for absolute quantification of Hepatitis B virus (HBV) DNA.
  • To establish a novel quantification method based on DNA amplification efficiency curves.
  • To assess the performance and accuracy of the developed system compared to commercial platforms.

Main Methods:

  • Development of a temperature sensor array chip for monitoring PCR thermal cycling profiles.
  • Estimation of DNA amplification efficiency using temperature data and a stochastic model.
  • Integration of a fluorescence detector system to monitor amplification in real-time.
  • Utilization of Förster resonance energy transfer (FRET) for endpoint detection of PCR products.
  • Construction of a chip-based, real-time PCR machine employing an amplification efficiency curve-based quantification method.

Main Results:

  • The chip-based system achieved absolute quantification of HBV DNA from a single sample without a standard curve.
  • The developed method demonstrated high precision, with inter-assay coefficient of variation (CV) below 5.87%.
  • The prototype's CV values were comparable or superior to commercial machines across a range of initial DNA concentrations (10^3 to 10^7 copies/ml).

Conclusions:

  • The novel chip-based real-time PCR system offers a robust and accurate method for absolute viral DNA quantification.
  • This approach simplifies the quantification process by eliminating the need for standard curves.
  • The developed technology shows significant potential for improving diagnostic capabilities in molecular biology and infectious disease monitoring.