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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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Visual Detection of Multiple Nucleic Acids in a Capillary Array
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Whole-genome detection using multivalent DNA-coated colloids.

Peicheng Xu1, Ting Cao2,3, Qihui Fan1

  • 1Beijing National Laboratory for Condensed Matter Physics and Laboratory of Soft Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China.

Proceedings of the National Academy of Sciences of the United States of America
|September 5, 2023
PubMed
Summary
This summary is machine-generated.

This study introduces a novel biosensor using DNA-functionalized colloids for rapid pathogen identification. This method offers a sensitive, specific, and cost-effective alternative for detecting bacterial DNA without amplification.

Keywords:
DNA detectioncolloidal probesfull genome detectionmultivalencysuperselectivity

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Author Spotlight: Advancements in DNA Nanosensors – Addressing Sensitivity and Selectivity Challenges in Molecular Detection
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Area of Science:

  • Biotechnology
  • Nanotechnology
  • Molecular Biology

Background:

  • Accurate and rapid pathogen identification is crucial to minimize antibiotic misuse.
  • Current gold-standard methods rely on DNA sequence recognition but can be time-consuming.
  • There is a need for simple, fast, and inexpensive diagnostic tools for infectious agents.

Purpose of the Study:

  • To develop and validate a novel biosensor strategy for pathogen detection.
  • To create a rapid, sensitive, and cost-effective method for identifying bacterial DNA.
  • To utilize multivalency and DNA-functionalized colloids for pathogen identification.

Main Methods:

  • Utilized DNA-functionalized polystyrene colloids as biosensors.
  • Employed a multivalency strategy for DNA probe binding to target bacterial genomes.
  • Detection based on the frequency of specific DNA sequences and cooperative binding, forming detectable aggregates.
  • Genome-wide detection without the need for nucleic acid amplification.

Main Results:

  • Achieved "mix and read" detection with high sensitivity and specificity.
  • Demonstrated a wide dynamic range of detection, from 10^2 to 10^12 copies/mL for *Escherichia coli* bl21-de3.
  • Exhibited excellent specificity against non-target bacteria and high recovery rates in real samples.
  • The sensitivity is comparable to state-of-the-art sensing techniques.

Conclusions:

  • The developed biosensor strategy is robust, sensitive, and specific for pathogen detection.
  • This approach offers a promising platform for applications in food safety, disease control, and environmental monitoring.
  • The method provides a significant advancement over traditional DNA-based pathogen identification techniques.