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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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Visual Detection of Multiple Nucleic Acids in a Capillary Array
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Morpholino-functionalized nanochannel array for label-free single nucleotide polymorphisms detection.

Hong-Li Gao1,2, Min Wang1, Zeng-Qiang Wu1

  • 1†State Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry and Chemical Engineering, Nanjing University, Collaborative Innovation Center of Chemistry for Life Sciences, Nanjing, Jiangsu 210093, China.

Analytical Chemistry
|March 4, 2015
PubMed
Summary

This study introduces a novel, label-free device for detecting single nucleotide polymorphisms (SNPs) using nanochannels. The method electrochemically monitors changes in probe diffusion flux to identify specific DNA sequence variations, aiding disease diagnosis.

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Area of Science:

  • Nanotechnology
  • Electrochemistry
  • Molecular Biology

Background:

  • Sensitive detection of single nucleotide polymorphisms (SNPs) is crucial for disease diagnosis, prevention, and pharmacogenomics.
  • Existing methods may lack selectivity or require complex labeling.
  • Developing simple, label-free SNP detection is highly desirable.

Purpose of the Study:

  • To develop a simple, highly selective, label-free sensing device for SNP detection.
  • To utilize electrochemically monitoring of ferricyanide probe diffusion flux across functionalized nanochannels.
  • To demonstrate the device's capability in detecting specific SNPs, including those relevant to acute promyelocytic leukemia (APL).

Main Methods:

  • Functionalizing porous anodic alumina nanochannels with probe DNA/morpholino duplex.
  • Electrocemically monitoring the diffusion flux of ferricyanide probe.
  • Analyzing changes in surface charge caused by target DNA binding (matched or mismatched) to probe DNA.
  • Correlating changes in ferricyanide diffusion flux with the presence and location of SNPs.

Main Results:

  • The device demonstrated high selectivity and sensitivity in detecting SNPs.
  • Label-free detection of single and double base mismatched sequences was achieved.
  • The specific location of mismatched bases could be identified.
  • SNPs in the PML/RARα fusion gene, a biomarker for APL, were successfully detected.

Conclusions:

  • The proposed nanochannel-based electrochemical sensing device offers a simple and effective method for label-free SNP detection.
  • This technology has significant potential for applications in disease diagnosis and personalized medicine.
  • The ability to detect specific SNP locations enhances its diagnostic utility.