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Single nucleotide polymorphism discrimination with and without an ethidium bromide intercalator.

Renzo A Fenati1, Ashley R Connolly1, Amanda V Ellis2

  • 1Flinders Centre for Nanoscale Science and Technology, Flinders University, Sturt Road, Bedford Park, Adelaide, South Australia 5042, Australia.

Analytica Chimica Acta
|January 14, 2017
PubMed
Summary
This summary is machine-generated.

This study uses toehold-mediated displacement reactions for single nucleotide polymorphism (SNP) genotyping. This method rapidly and accurately discriminates SNPs in mitochondrial DNA HV1, crucial for genetic variation studies.

Keywords:
Fluorescence quenchingGenotypingKineticsNucleotide polymorphismStrand displacement

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Area of Science:

  • Molecular Biology
  • Genetics
  • Biochemistry

Background:

  • Single nucleotide polymorphism (SNP) genotyping is essential for understanding genetic variations.
  • Mitochondrial DNA (mtDNA) HV1 region is associated with maternal ancestry and harbors important SNPs.

Purpose of the Study:

  • To develop and validate a rapid SNP genotyping method using toehold-mediated displacement reactions.
  • To improve the discrimination of SNPs, particularly those involving cytosine.

Main Methods:

  • Utilized toehold-mediated displacement reactions with DNA targets from mtDNA HV1 region.
  • Designed DNA targets with a pendant toehold and ATTO 647N fluorophore reporter.
  • Employed complementary displacing sequences labeled with Black Hole Quencher 1.
  • Investigated the effect of an intercalating agent (ethidium bromide) on reaction rates and discrimination.

Main Results:

  • Reaction rates followed the order: TPP-Cytosine > TPP-Thymine > TPP-Adenine ≥ TPP-Guanine.
  • Non-complementary reactions, especially with cytosine mismatches, were the slowest.
  • Achieved SNP discrimination within 15 minutes with 80-90% quenching, faster than previous FRET methods.
  • Ethidium bromide enhanced cytosine SNP discrimination by stabilizing base pairing.

Conclusions:

  • Toehold-mediated displacement reactions offer a rapid and efficient method for SNP genotyping.
  • The developed method significantly improves discrimination of SNPs, especially cytosine-containing ones.
  • This technique has potential applications in genetic variation studies and ancestry analysis.