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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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Related Experiment Video

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Fine-tuning the Size and Minimizing the Noise of Solid-state Nanopores
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Sequence-Specific Detection of DNA Strands Using a Solid-State Nanopore Assisted by Microbeads.

Yin Zhang1, Zengdao Gu1, Jiabin Zhao1

  • 1Jiangsu Key Laboratory for Design and Manufacture of Micro-Nano Biomedical Instruments, School of Mechanical Engineering, Southeast University, Nanjing 211189, China.

Micromachines
|December 16, 2020
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Summary

This study presents a novel method for detecting specific DNA sequences using microbeads and nanopore sensing. This approach offers a simple, rapid, and low-cost solution for molecular diagnostics.

Keywords:
DNA detectionmicrobeadnanopore

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Area of Science:

  • Biotechnology
  • Nanotechnology
  • Molecular Biology

Background:

  • Accurate DNA detection is vital for molecular diagnostics and therapies.
  • Current methods can be complex, slow, or expensive.
  • There is a need for simple, rapid, and low-cost DNA detection techniques.

Purpose of the Study:

  • To develop a simple, rapid, and low-cost method for detecting specific DNA sequences.
  • To utilize microbeads and nanopore sensing for enhanced DNA detection.
  • To differentiate target DNA from non-target molecules based on signal characteristics.

Main Methods:

  • Target DNA molecules were hybridized with biotinylated probes and captured by streptavidin-coated microbeads.
  • A nanopore sensor, with a diameter smaller than the microbeads, was used to detect ionic pulse signals.
  • Signal duration and amplitude were analyzed to identify specific DNA sequences.

Main Results:

  • DNA molecules attached to microbeads exhibited significantly longer signal durations (two orders of magnitude) compared to free DNA.
  • Simultaneous translocation of multiple DNA molecules on microbeads generated larger amplitude pulse signals.
  • Specific DNA sequences were successfully identified by analyzing these distinct ionic pulse signals.

Conclusions:

  • Nanopore sensing assisted by microbeads provides a robust method for specific DNA sequence detection.
  • The technique offers a simple, rapid, and low-cost alternative for molecular diagnosis.
  • This approach has potential applications in molecular diagnostics and therapy.