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Related Concept Videos

Mismatch Repair01:20

Mismatch Repair

Organisms are capable of detecting and fixing nucleotide mismatches that occur during DNA replication. This sophisticated process requires identifying the new strand and replacing the erroneous bases with correct nucleotides. Mismatch repair is coordinated by many proteins in both prokaryotes and eukaryotes.
The Mutator Protein Family Plays a Key Role in DNA Mismatch Repair
The human genome has more than 3 billion base pairs of DNA per cell. Prior to cell division, that vast amount of genetic...
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Mismatch Repair01:36

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Labeling DNA Probes03:31

Labeling DNA Probes

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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Split Hybridization Probe Utilizing a DNA Fluorescent Light-up Aptamer as a Signal Reporter for Sequence-Specific Nucleic Acid Analysis
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Single-mismatch detection using nucleic acid molecular 'light switch'.

Lian-Sheng Ling1, Zhi-Ke He, Fang Chen

  • 1Department of Chemistry, Wuhan University, Wuhan 430072, People's Republic of China; Institute of Chemistry, The Chinese Academy of Science, Beijing 100080, People's Republic of China.

Talanta
|October 31, 2008
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Summary
This summary is machine-generated.

This study introduces a novel nucleic acid molecular

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Area of Science:

  • Molecular Biology
  • Biochemistry
  • Analytical Chemistry

Background:

  • Accurate detection of single-base mismatched oligonucleotides is crucial for genetic analysis and diagnostics.
  • Existing methods often require complex separation steps for mixed oligonucleotide samples.
  • Development of sensitive and rapid detection techniques for DNA sequence variations is needed.

Purpose of the Study:

  • To develop a novel nucleic acid molecular 'light switch' method for sensitive detection of single-base mismatched oligonucleotides.
  • To evaluate the performance of a specific ruthenium complex, Ru(phen)2(dppx)2+, as a probe for distinguishing perfect and mismatched DNA duplexes.
  • To demonstrate the method's applicability in complex mixtures without prior target separation.

Main Methods:

  • Utilized a 'light switch' mechanism based on fluorescence intensity and temperature changes.
  • Employed the Ru(phen)2(dppx)2+ complex for probing DNA hybridization.
  • Assessed detection limits for perfect and various mismatched oligonucleotides.

Main Results:

  • Achieved sensitive detection of single-base mismatched oligonucleotides.
  • Established detection limits: 0.11 ng/mL for perfect duplex, 0.17 ng/mL for single-base mismatch, 0.34 ng/mL for two-base mismatch, and 1.5 ng/mL for three-base mismatch.
  • Demonstrated successful differentiation of perfect, mismatched, and random DNA targets in mixed solutions without separation.

Conclusions:

  • The developed 'light switch' method offers a simple, fast, and sensitive approach for oligonucleotide recognition and detection.
  • Ru(phen)2(dppx)2+ is an effective probe for distinguishing DNA hybridization states based on fluorescence and temperature.
  • This technique holds potential for studying DNA hybridization dynamics and has applications in specific DNA sequence detection.