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A novel glycerol 'X' linker enhances fluorogenic probes for quantitative polymerase chain reaction (qPCR), enabling sensitive detection of multiple viruses like SARS-CoV-2 and influenza in a single test. This improved probe design boosts diagnostic accuracy.

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Area of Science:

  • Molecular Biology
  • Biochemistry
  • Oligonucleotide Chemistry

Background:

  • Quantitative polymerase chain reaction (qPCR) relies on fluorescent probes for DNA/RNA quantification.
  • Fluorogenic probe performance is critically dependent on fluorophore, quencher, and linker design.
  • TaqMan® probes are widely used in research and clinical diagnostics.

Purpose of the Study:

  • To develop a highly modular linker for fluorogenic oligonucleotide probes.
  • To create a multiplexed assay for simultaneous detection of multiple RNA viruses.
  • To compare the performance of a novel 'X' linker with existing linker strategies.

Main Methods:

  • Design and synthesis of a three-way branched glycerol 'X' linker for TaqMan® probes.
  • Incorporation of various fluorophores (Flu, Hex, Cy5, Cy5.5) and quenchers (BHQ1, BHQ2).
  • Development of a four-color reverse transcription qPCR (RT-qPCR) 'tetraplex' assay for viral RNA detection.

Main Results:

  • The 'X' linker enabled a tetraplex RT-qPCR assay for SARS-CoV-2, influenza A, and influenza B viruses.
  • Probes with the 'X' linker achieved single-molecule detection limits near four copies.
  • The 'X' linker demonstrated superior performance over an arabinoside-based (ara) linker, showing distinct cleavage mechanisms during primer extension.

Conclusions:

  • The glycerol 'X' linker is a highly effective and modular component for fluorogenic probes.
  • Linker structure significantly impacts oligonucleotide probe performance in qPCR assays.
  • This linker facilitates the development of sensitive and multiplexed diagnostic tools for infectious diseases.