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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...

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qPCRTag Analysis - A High Throughput, Real Time PCR Assay for Sc2.0 Genotyping
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High-throughput real-time PCR-based genotyping without DNA purification.

Anastasia Fedick1, Jing Su, Chaim Jalas

  • 1Department of Molecular Genetics, Microbiology, and Immunology, UMDNJ-Robert Wood Johnson Medical School, Piscataway, NJ, USA. afedick@rmanj.com

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|October 23, 2012
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Summary

High-throughput genotyping directly from blood, without DNA purification, offers high accuracy and call rates. This streamlined approach accelerates the process, reduces costs, and minimizes errors in genetic analysis.

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Area of Science:

  • Genetics
  • Molecular Biology
  • Biotechnology

Background:

  • Traditional DNA purification hinders high-throughput genotyping.
  • Existing direct-from-blood methods are not optimized for current high-throughput platforms.
  • A novel quantitative real-time PCR (qPCR) method for direct blood genotyping was developed.

Purpose of the Study:

  • To evaluate the performance of qPCR-based genotyping directly from blood compared to purified DNA.
  • To establish a high-throughput method for direct blood genotyping on a qPCR platform.

Main Methods:

  • Genotyping of 60 mutations in Ashkenazi Jewish individuals using purified DNA and whole blood.
  • Utilized the QuantStudio™12K Flex Real-Time PCR System for high-throughput analysis.
  • Compared call rates, accuracy, and variation between the two sample preparation methods.

Main Results:

  • Direct blood genotyping achieved 99.21% call rate and 100% accuracy.
  • Purified DNA yielded 92.49% call rate and 99.74% accuracy.
  • Direct blood method showed significantly less variation and was validated in a large cohort (96 individuals, 5,760 genotypes in 5 hours).

Conclusions:

  • Accurate high-throughput qPCR-based genotyping is feasible directly from blood without DNA purification.
  • This method can expedite genotyping, reduce costs, and minimize sample handling errors.
  • Direct blood genotyping represents a significant advancement for large-scale genetic analysis.