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Related Concept Videos

Labeling DNA Probes03:31

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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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Tunable fluorogenic DNA probes drive fast and high-resolution single-molecule fluorescence imaging.

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Researchers developed novel fluorogenic DNA probes to overcome the high concentration barrier in single-molecule fluorescence (SMF) measurements. These probes enable significantly higher concentrations, enhancing super-resolution imaging and molecular tracking capabilities.

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Area of Science:

  • Biophysics
  • Molecular Biology
  • Nanotechnology

Background:

  • Single-molecule fluorescence (SMF) measurements are limited by the 'high concentration barrier', restricting the maximum usable concentration of fluorescent species for optimal signal-to-noise ratio.
  • Existing SMF techniques face limitations in achieving high concentrations, hindering applications requiring dense labeling or rapid event acquisition.

Purpose of the Study:

  • To design and engineer novel fluorogenic probes that overcome the high concentration barrier in SMF.
  • To adapt probe design for enhanced fluorescence and efficient hybridization to target sequences.
  • To demonstrate the utility of these probes in advanced imaging techniques like super-resolution microscopy.

Main Methods:

  • Development of fluorogenic probes based on short single-stranded DNA sequences that fluoresce upon hybridization.
  • Engineering of quenching efficiency and fluorescence enhancement by screening fluorophore-quencher combinations, label lengths, and sequence motifs.
  • Implementation of probes in Total Internal Reflection Fluorescence (TIRF) microscopy and DNA-PAINT super-resolution imaging protocols.

Main Results:

  • Achieved SMF experiments at 10 μM fluorescent label concentrations, a 100-fold increase over standard TIRF limits.
  • Demonstrated successful super-resolution imaging of viral genome segments with 20-nm resolution in approximately 150 seconds using DNA-PAINT.
  • Validated the exceptional tunability of the probe design for diverse experimental needs.

Conclusions:

  • The developed fluorogenic probes effectively overcome concentration limitations in SMF.
  • These probes significantly enhance the speed and resolution of super-resolution imaging techniques like DNA-PAINT.
  • The probe's design offers broad applicability for advancing molecular tracking, smFRET, and other SMF-based applications.