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Simulation-guided tunable DNA probe design for mismatch tolerant hybridization.

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This study introduces a novel toehold probe system capable of detecting nucleic acid sequences with multiple unknown single nucleotide polymorphisms (SNPs). The adaptable design precisely identifies mutated sequences, even in complex samples like HIV.

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Area of Science:

  • Molecular Biology
  • Biotechnology
  • Nucleic Acid Detection

Background:

  • Accurate nucleic acid sequence analysis is crucial but challenged by variations from canonical sequences.
  • Traditional probe and primer design relies on strict Watson-Crick base-pairing, limiting detection of mutated sequences.
  • Detecting sequences with unknown single nucleotide polymorphisms (SNPs) remains a significant hurdle in molecular diagnostics.

Purpose of the Study:

  • To develop a robust and tunable detection system for nucleic acid sequences with variable and unknown SNPs.
  • To overcome the limitations of standard base-pairing rules in identifying sequence deviations.
  • To demonstrate the system's capability in detecting complex, mutated sequences in real-world clinical samples.

Main Methods:

  • Engineered a toehold-based exchange probe with a 'sloppy' protector seal incorporating controlled, sequential mismatches.
  • Systematically varied the number and position of mismatches to assess tolerance to thermodynamic deviations (up to 15 kcal/mole).
  • Validated the mismatch-tolerant system using synthetic targets and clinical samples from diverse HIV sub-populations.

Main Results:

  • The toehold probe system accurately detected targets with up to four mismatches, closely following predicted behavior.
  • Detection fidelity remained consistent irrespective of mismatch location on the protector seal or target sequence.
  • The system successfully resolved multiple, iteratively mutated HIV sequences from clinical samples with high precision.

Conclusions:

  • The developed mismatch-tolerant toehold probe offers a versatile and precise method for detecting nucleic acid sequence variations.
  • This approach significantly advances the ability to analyze complex genetic targets, including those with unknown SNPs.
  • The system's demonstrated efficacy on HIV samples highlights its potential for applications in infectious disease diagnostics and personalized medicine.