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Recognition of mixed-sequence double-stranded DNA regions using chimeric Invader/LNA probes
Michaela E Everly1, Raymond G Emehiser1, Patrick J Hrdlicka1
1Department of Chemistry, University of Idaho, Moscow, Idaho 83844-2343, USA. hrdlicka@uidaho.edu.
Organic & Biomolecular Chemistry
|October 16, 2024
Summary
New chimeric Invader/LNA probes show promise for gene expression modulation and genetic disease diagnostics. While chimeric probes are unstable, individual Invader and LNA strands offer high accuracy in recognizing double-stranded DNA (dsDNA) targets.
Area of Science:
- Molecular Biology
- Biophysics
- Oligonucleotide Chemistry
Background:
- Oligonucleotide probes for double-stranded DNA (dsDNA) recognition are crucial for gene expression modulation, diagnostics, and genetic disease therapies.
- Strand-invading probes, including Invader and chimeric Invader/γPNA probes, are actively developed for specific dsDNA targeting.
- Invader probes utilize intercalator-functionalized nucleotides, while chimeric probes involve heteroduplexes between different nucleic acid types.
Purpose of the Study:
- To investigate the biophysical properties and dsDNA recognition capabilities of a novel class of chimeric Invader/LNA probes.
- To evaluate the stability and target recognition accuracy of these new probes compared to existing technologies.
- To explore the potential applications of these probes in molecular biology, diagnostics, and therapeutics.
Main Methods:
- Synthesis and characterization of chimeric Invader/LNA probes, featuring modified Invader and locked nucleic acid (LNA) strands.
- Assessment of heteroduplex stability and dsDNA binding affinity using biophysical techniques.
- Evaluation of probe performance in recognizing model dsDNA targets with single base-pair resolution.
Main Results:
- Chimeric Invader/LNA probes form labile and distorted heteroduplexes due to incompatibility between intercalating pyrene moieties and LNA strands.
- Individual Invader and LNA strands exhibit high stability and form strong duplexes with complementary DNA.
- The probes demonstrate near-stoichiometric recognition of dsDNA targets with single base-pair accuracy, driven by stable individual strand duplexes.
Conclusions:
- Chimeric Invader/LNA probes possess unique properties arising from the interplay between their components.
- The stability of individual Invader and LNA strands is key to achieving accurate dsDNA recognition.
- These findings open new avenues for developing advanced molecular tools for biological research, diagnostics, and treatment of genetic diseases.
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