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Related Concept Videos

Labeling DNA Probes03:31

Labeling DNA Probes

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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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An upconversion nanoparticle-based photostable FRET system for long-chain DNA sequence detection.

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Area of Science:

  • Biomedical Diagnostics
  • Nanotechnology
  • Molecular Biology

Background:

  • Traditional fluorescence resonance energy transfer (FRET) methods struggle with detecting long DNA sequences.
  • Long DNA sequences are crucial for high-selectivity disease diagnosis.
  • An efficient FRET system for long-chain DNA detection is needed.

Purpose of the Study:

  • To develop a new FRET system capable of detecting long-chain DNA sequences.
  • To overcome the distance limitations of traditional FRET methods for DNA detection.
  • To create a highly selective and sensitive diagnostic tool for diseases like HIV.

Main Methods:

  • Developed a 'head-to-tail' FRET structure using NaYF4:Yb,Er nanoparticles (donor) and gold nanoparticles (acceptor).
  • Modified NaYF4:Yb,Er nanoparticles with poly(acrylic acid) for enhanced hydrophilicity and attached capture oligonucleotides.
  • Utilized sandwich hybridization for bringing donor and acceptor nanoparticles in proximity upon target DNA binding.

Main Results:

  • Achieved efficient FRET for detecting long-chain DNA (52 bp HIV DNA).
  • Overcame photobleaching issues using photostable upconversion nanoparticles (UCNPs) and gold nanoparticles (AuNPs).
  • Demonstrated high selectivity and sensitivity, reaching a nanomolar detection limit.

Conclusions:

  • The developed 'head-to-tail' FRET system is the first to detect long-chain DNA sequences.
  • This method offers a promising approach for accurate and sensitive disease diagnosis.
  • The system's photostability and high performance address limitations of existing FRET techniques.