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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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Enzyme-Triggered DNA Sensor Technology for Spatially-Controlled, Cell-Selective Molecular Imaging.

Mengyuan Li1, Lele Li2,3

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This study introduces enzyme-triggered DNA sensors for precise molecular imaging in specific cell types. These advanced DNA biosensors overcome limitations of traditional sensors by using disease-associated enzymes to control spatial sensing, improving disease diagnosis.

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Area of Science:

  • Biotechnology
  • Molecular Biology
  • Chemical Engineering

Background:

  • DNA sensors offer programmability for complex tasks but often lack spatial control and cell-type selectivity.
  • This limitation hinders accurate disease-specific imaging due to indistinguishable signals from normal and diseased cells.
  • Disease-associated enzymes are overexpressed in pathological conditions, presenting an opportunity for targeted biosensing.

Purpose of the Study:

  • To develop DNA-based sensor technology triggered by endogenous enzymes for spatially controlled, cell-type selective molecular imaging.
  • To engineer DNA sensors that leverage disease-specific enzymes for enhanced sensitivity and specificity in diagnostics.
  • To overcome the signal-to-background ratio limitations of current biosensors for improved disease detection.

Main Methods:

  • Designed DNAzyme- and aptamer-based sensors with enzymatically cleavable sites.
  • Incorporated peptide functionalization using PNA (peptide nucleic acid) as bridge molecules for protease-activated sensors.
  • Developed enzyme-triggered signal amplification strategies, including molecular beacons and catalytic hairpin assembly.

Main Results:

  • Demonstrated cancer cell-selective imaging of various molecular targets using enzyme-controlled DNA sensors.
  • Established protease-activated DNA biosensors for spatioselective imaging in cancer cells and tumor microenvironments.
  • Achieved spatially selective RNA and non-RNA imaging in specific disease cells (e.g., inflammatory, cancer) with enhanced signal-to-background ratios.

Conclusions:

  • Endogenous enzyme-triggered DNA sensors enable spatially controlled and cell-type selective molecular imaging.
  • This approach significantly improves signal-to-background ratios, leading to enhanced disease-site specificity.
  • The developed technology holds promise for a new era of molecular diagnostics and spatially resolved disease imaging.