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Related Concept Videos

Spontaneous and Induced Mutations01:30

Spontaneous and Induced Mutations

Spontaneous mutations arise infrequently during DNA replication due to errors in the process. A key factor behind these errors is tautomeric shifts in nitrogenous bases, where bases transition from keto to enol forms or amino to imino forms. This shift can alter base-pairing rules, leading to mutations. Additionally, reactive oxygen species (ROS) arising from aerobic metabolism can damage DNA, resulting in depurination (loss of a purine base) or depyrimidination (loss of a pyrimidine base).
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The pentose sugar in DNA is deoxyribose, while in RNA the pentose sugar is ribose. The difference between the sugars is the presence of the hydroxyl group on the ribose's second carbon and a hydrogen on the deoxyribose's second carbon. The phosphate residue attaches to the hydroxyl group of the 5′ carbon of one sugar and the hydroxyl group of the 3′ carbon of the sugar of the next nucleotide, which forms  a 5′ to 3′ phosphodiester linkage.
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DNA has a double-helix structure. The...
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Sequence-specific and Selective Recognition of Double-stranded RNAs over Single-stranded RNAs by Chemically Modified Peptide Nucleic Acids
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Nucleic acid-induced aggregation and pyrene excimer formation.

Ruixing Zhang1, Dan Tang, Ping Lu

  • 1State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, PR China.

Organic Letters
|September 3, 2009
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Summary

Nucleic acids can cause a fluorescent probe to aggregate, leading to detectable signals. This discovery offers a new method for label-free nucleic acid biosensing.

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Area of Science:

  • Biochemistry
  • Analytical Chemistry
  • Molecular Biology

Background:

  • Nucleic acid detection is crucial for diagnostics and research.
  • Current methods often require labeling, increasing complexity and cost.
  • Development of sensitive, label-free detection strategies is highly desirable.

Purpose of the Study:

  • To investigate the interaction between nucleic acids and a positively charged pyrene probe.
  • To explore the potential of this interaction for developing a novel biosensing platform.
  • To establish a label-free method for nucleic acid detection.

Main Methods:

  • Utilized a positively charged pyrene derivative (compound 1) as a fluorescent probe.
  • Studied the effect of nucleic acids on the aggregation state of the pyrene probe.
  • Measured pyrene excimer emission intensity.
  • Analyzed the influence of probe concentration, oligonucleotide length, sequence, and concentration on the emission signal.

Main Results:

  • Nucleic acid binding induced the aggregation of the pyrene probe.
  • Significant pyrene excimer emission was observed upon nucleic acid interaction.
  • The excimer emission intensity showed a clear dependence on oligonucleotide properties (length, sequence, concentration) and probe concentration.
  • Demonstrated a dose-dependent response to nucleic acids.

Conclusions:

  • The aggregation of the pyrene probe induced by nucleic acids provides a sensitive detection mechanism.
  • This interaction forms the basis for a new label-free nucleic acid biosensing strategy.
  • The developed method offers potential for simple, cost-effective nucleic acid detection in various applications.