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DNA probes are fragments of DNA labeled with a reporter tag to enable their detection or purification. The resulting labeled DNA probes can then hybridize to target nucleic acid sequences through complementary base-pairing, and may be used to recover or identify these regions.
Radioisotopes, fluorophores, or small molecule binding partners like biotin or digoxigenin, are the most widely used reporter tags for labeling DNA probes. These labels can be attached to the probe DNA molecule via...
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Split Hybridization Probe Utilizing a DNA Fluorescent Light-up Aptamer as a Signal Reporter for Sequence-Specific Nucleic Acid Analysis
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Development of an Interaction Assay between Single-Stranded Nucleic Acids Trapped with Silica Particles and

T Isoda1, R Maeda2

  • 1Department of Life and Environment Engineering, Faculty of Environmental Engineering, University of Kitakyushu, 1-1, Hibikino, Wakamatsu, Kitakyushu 808-0135, Japan. isoda@env.kitakyu-u.ac.jp.

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Summary

We developed a method to immobilize polynucleotides on silica particles using hydrogen bonding, preventing denaturation. This technique allows for the detection of nucleic acid sequences through fluorescence intensity changes.

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Area of Science:

  • Biomaterials Science
  • Nanotechnology
  • Molecular Biology

Background:

  • Biopolymers are susceptible to denaturation from heat, pH changes, or chemicals when immobilized on surfaces.
  • Developing methods to stabilize biopolymers on substrates is crucial for various applications, including diagnostics and biosensing.
  • Silica particles offer a versatile platform for biopolymer immobilization due to their chemical stability and tunable surface properties.

Purpose of the Study:

  • To develop a novel method for immobilizing single-stranded nucleic acids onto silica particles while preventing denaturation.
  • To investigate the use of hydrogen bonding for trapping polynucleotides onto aminoalkyl-modified silica surfaces.
  • To evaluate the potential of fluorescently labeled complexes for detecting nucleic acid interactions.

Main Methods:

  • Synthesized aminoalkyl-modified silica particles ([A-AM silane]/SiO2) via silane coupling reaction.
  • Characterized the surface chemistry of modified silica particles using Fourier transform infrared spectroscopy and molecular orbital calculations.
  • Trapped single-stranded nucleic acids (Poly-A, Poly-G, Poly-C) onto [A-AM silane]/SiO2 via hydrogen bonding and subsequently labeled with acridine orange (AO).

Main Results:

  • Successfully immobilized single-stranded nucleic acids onto the modified silica particles, forming conjugated materials.
  • Observed varying fluorescence intensities in the [AO:Poly-X:A-AM silane]/SiO2 complexes, with the order [AO:Poly-G] > [AO:Poly-A] >> [AO:Poly-C].
  • Demonstrated that fluorescence intensity changes reflect the molecular interactions between acridine orange and specific nucleic acid bases.

Conclusions:

  • The developed method effectively immobilizes polynucleotides on silica particles via hydrogen bonding, preserving their structure.
  • The differential fluorescence response indicates the potential for sequence-specific detection of nucleic acids.
  • This approach offers a promising strategy for developing novel biosensors and diagnostic tools based on nucleic acid interactions.