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DNA sequencing is a fundamental technique that is routinely used in the biological sciences. This method can be applied to a range of questions at different scales - from the sequencing of a cloned DNA fragment or the study of a mutation in a gene up to whole-genome sequencing. However, despite the widespread use of sequencing today, it was not until 1977 that Fredrick Sanger and his collaborators developed the chain-termination method to decode DNA sequences. It relies on the separation of a...
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An Allele-specific Gene Expression Assay to Test the Functional Basis of Genetic Associations
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Conversion strategy using an expanded genetic alphabet to assay nucleic acids.

Zunyi Yang1, Michael Durante, Lyudmyla G Glushakova

  • 1Foundation for Applied Molecular Evolution (FfAME), Gainesville, Florida 32601, United States. zyang@ffame.org

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New assay designs convert nucleic acid (xNA) sequences using nonstandard nucleotides (Z and P) to reduce noise and improve detection accuracy in complex biological samples. This method enhances signal output and minimizes false positives for more reliable xNA analysis.

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Area of Science:

  • Molecular Biology
  • Biotechnology
  • Assay Development

Background:

  • Nucleic acid (xNA) detection methods are susceptible to noise, false positives, and false negatives, particularly in multiplexed assays with complex mixtures.
  • Existing assay architectures can be limited by cross-binding and competition from natural oligonucleotides.

Purpose of the Study:

  • To develop novel assay architectures that mitigate noise and improve the accuracy of xNA detection.
  • To introduce a conversion method using nonstandard nucleotides (Z and P) to enhance assay performance.

Main Methods:

  • Designed assay architectures that convert standard xNA sequences into sequences containing nonstandard nucleotides (Z and P).
  • Utilized a polymerase to incorporate dZTP opposite template dG, creating Z-containing extension products.
  • Assessed improvements in an inverted Luminex xTAG architecture using biotinylated primers and bead-bound capture oligonucleotides.

Main Results:

  • The assay with conversion demonstrated higher signal output compared to the assay without conversion.
  • The Z/P base pair exhibited selective binding, reducing competition from natural oligonucleotides.
  • Improved detection capabilities for Luminex instruments in complex biological samples.

Conclusions:

  • The developed assay architectures effectively reduce noise and false positives in xNA detection.
  • The use of nonstandard nucleotides (Z and P) offers a robust strategy for enhancing assay specificity and sensitivity.
  • These advancements provide a more reliable method for xNA analyte detection in complex biological matrices.