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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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Large flanking sequence effects in single nucleotide mismatch detection using fluorescent nucleoside C(f).

Haraldur Gardarsson1, Snorri Th Sigurdsson

  • 1University of Iceland, Science Institute, Reykjavik, Iceland.

Bioorganic & Medicinal Chemistry
|July 20, 2010
PubMed
Summary

This study introduces fluoroside C(f) for detecting DNA mismatches, finding it effective in most sequences. Mercuric ions significantly improved mismatch identification by selectively quenching fluorescence.

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Area of Science:

  • Molecular Biology
  • Biochemistry
  • Genetics

Background:

  • DNA mismatch detection is crucial for genetic stability.
  • Fluorescent nucleotides offer a sensitive method for probing DNA structures.
  • Flanking sequences can influence the accuracy of mismatch detection.

Purpose of the Study:

  • To systematically investigate the impact of flanking sequences on mismatch detection using fluoroside C(f).
  • To explore methods for enhancing the accuracy of fluoroside C(f) in identifying DNA mismatches.
  • To introduce a novel application of mercuric ions in improving fluorescent mismatch detection.

Main Methods:

  • Utilized fluoroside C(f) to form DNA duplexes with varying flanking sequences.
  • Analyzed fluorescence intensity variations between mismatched and fully base-paired duplexes.
  • Experimentally modulated conditions (temperature, co-solvents, potassium iodide) to optimize mismatch identification.
  • Introduced mercuric ions to selectively quench fluorescence of specific mismatches.

Main Results:

  • Fluoroside C(f) distinguished mismatches from correct base pairs in 13 out of 16 flanking sequences.
  • Accurate identification of individual mismatches was achieved in 10 sequences.
  • Altering temperature, co-solvents, or potassium iodide did not improve fluorescence resolution.
  • Mercuric ions selectively quenched C(f).T mismatch fluorescence, resolving spectral overlaps and enabling unambiguous identification in all sequences.

Conclusions:

  • Flanking sequences significantly affect fluoroside C(f) mismatch detection sensitivity.
  • Mercuric ion addition represents a novel and effective strategy for enhancing fluorescent DNA mismatch detection.
  • Fluoroside C(f), particularly with mercuric ion treatment, shows promise for precise DNA mismatch identification across diverse sequence contexts.