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Real Time RT-PCR02:57

Real Time RT-PCR

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The real-time quantification of the number of amplified products is...

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Multiplex real-time single nucleotide polymorphism detection and quantification by quencher extension.

Knut Rudi1, Monika Zimonja, Sigrun E Hannevik

  • 1MATFORSK Norwegian Food Research Institute, As, Norway. knut.rudi@matforsk.no

Biotechniques
|March 30, 2006
PubMed
Summary

Multiplex quencher extension (multiplex-QEXT) offers simultaneous detection and quantification of multiple single nucleotide polymorphisms (SNPs). This novel method provides high resolution for bacterial strain typing, surpassing traditional serotyping.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Microbiology

Background:

  • Single nucleotide polymorphisms (SNPs) are crucial genetic markers.
  • Simultaneous detection of multiple SNPs is challenging.
  • Existing methods may lack resolution or require multiple steps.

Purpose of the Study:

  • To evaluate the novel multiplex quencher extension (multiplex-QEXT) method.
  • To assess its capability for simultaneous SNP detection and quantification.
  • To determine its effectiveness in bacterial strain typing.

Main Methods:

  • Developed and applied multiplex-QEXT for simultaneous SNP analysis.
  • Utilized reporter-labeled probes and TAMRA dideoxy nucleotides.
  • Analyzed four SNP loci in the Listeria monocytogenes inlA gene across 252 strains.

Main Results:

  • Multiplex-QEXT successfully detected and quantified multiple SNPs simultaneously.
  • Achieved high resolution in differentiating L. monocytogenes strains, identifying seven major and five minor groups.
  • Demonstrated superior resolution compared to traditional serotyping.
  • Established detection limits as low as 5-10% for target SNP alleles.

Conclusions:

  • Multiplex-QEXT is a powerful closed-tube, single-step method for multiplex SNP analysis.
  • It offers high resolution for bacterial strain typing and quantitative insights.
  • Future advancements in fluorochromes will enhance multiplexing capabilities.