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Factors Impacting Invader-Mediated Recognition of Double-Stranded DNA.

Caroline P Shepard1, Raymond G Emehiser1, Saswata Karmakar1

  • 1Department of Chemistry, University of Idaho, Moscow, ID 83844-2343, USA.

Molecules (Basel, Switzerland)
|January 8, 2023
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Summary

Chemically modified Invader probes enable sequence-unrestricted recognition of chromosomal DNA. Densely modified probes show high binding specificity in fluorescence in situ hybridization (FISH) experiments, advancing life science applications.

Keywords:
DNADNA recognitionFISHSNPchromosomesfluorescencekaryotypingoligonucleotidespyrenestrand invasion

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Area of Science:

  • Molecular Biology
  • Biochemistry
  • Genetics

Background:

  • Developing chemically modified oligonucleotides for sequence-unrestricted DNA recognition is a long-standing scientific challenge.
  • Existing DNA probes often have limitations in target recognition conditions, such as sequence specificity or ionic strength requirements.

Purpose of the Study:

  • To investigate design parameters influencing the thermal denaturation and binding affinities of Invader probes.
  • To enhance the efficiency and specificity of Invader probes for chromosomal DNA recognition.

Main Methods:

  • Design and synthesis of ten modified Invader probes.
  • Biophysical characterization including binding affinity and thermal denaturation studies.
  • Evaluation of probe binding to model DNA hairpins and chromosomal DNA targets.
  • Spearman's rank-order correlation analysis of probe design parameters.

Main Results:

  • Densely modified Invader probes demonstrated efficient and specific recognition of chromosomal DNA targets.
  • Probes exhibited excellent binding specificity in both denaturing and non-denaturing fluorescence in situ hybridization (FISH) experiments.
  • Optimization based on initial findings led to improved Invader probe constructs.

Conclusions:

  • Understanding design parameters is crucial for developing effective Invader probes.
  • Optimized Invader probes offer robust tools for chromosomal DNA targeting in various biological applications.
  • This research facilitates the future design of advanced Invader probes for life sciences.