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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.
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Microarrays are high-throughput and relatively inexpensive assays that can be automated to analyze large quantities of data at a time. They are used in genome-wide studies to compare gene or protein expression under two varied conditions, such as healthy and diseased states. Microarrays consist of glass or silica slides on which probe molecules are covalently attached through surface functionalization. Most commonly, the slides are prepared through the chemisorption of silanes to silica...
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Fluorescence in situ hybridization, or FISH, was developed in the early 1980s and has quickly become one of the most widely used techniques in cytogenetics. Labeled probes are used to bind complementary DNA or RNA sequences on a chromosome or in a region within a cell. Earlier, the probes could only be obtained by cloning or reverse transcription of a DNA template. Currently, the probe oligonucleotides can be synthesized synthetically. Additionally, with the advancement of optical techniques,...
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Encoding Multiple Virtual Signals in DNA Barcodes with Single-Molecule FRET.

Sung Hyun Kim1, Hyunwoo Kim2, Hawoong Jeong2

  • 1School of Biological Sciences and Institute for Molecular Biology and Genetics, Seoul National University, Seoul 08826, South Korea.

Nano Letters
|February 15, 2021
PubMed
Summary

Researchers developed a new DNA barcoding method using single-molecule fluorescence resonance energy transfer (FRET) to overcome spectral overlap limitations. This technique enhances the number of detectable DNA barcodes for biological labeling applications.

Keywords:
DNA barcodeFRETFluorescenceMultiplexingSingle-molecule

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Area of Science:

  • Biotechnology
  • Molecular Biology
  • Bioimaging

Background:

  • DNA barcoding enables biological molecule labeling through DNA sequence synthesis.
  • Conventional fluorescence imaging for DNA barcoding faces limitations due to spectral overlap of dyes, restricting simultaneous detection.
  • Existing methods struggle to increase the number of uniquely identifiable DNA barcodes.

Purpose of the Study:

  • To demonstrate a novel DNA barcoding approach using single-molecule fluorescence resonance energy transfer (FRET).
  • To overcome the spectral overlap limitations inherent in traditional fluorescence-based DNA barcoding.
  • To expand the multiplexing capacity of DNA barcoding techniques.

Main Methods:

  • Utilized single-molecule FRET to encode virtual signals within DNA barcodes.
  • Employed conventional two-color fluorescence microscopy for signal detection.
  • Optimized imaging and biochemical conditions to enhance accuracy of weak DNA hybridization events.

Main Results:

  • Achieved unambiguous differentiation of six DNA barcodes based on distinct FRET efficiency values.
  • Demonstrated the ability to encode virtual signals without altering probe sequences.
  • Markedly enhanced the accuracy of single-molecule FRET efficiency determination.

Conclusions:

  • The single-molecule FRET method effectively expands the signal space for DNA barcoding.
  • This technique offers a direct integration with existing DNA barcoding strategies.
  • The approach holds potential for widespread adoption to increase multiplexing capabilities in biological labeling.