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Fluorescence-based directed termination PCR: direct mutation characterization without sequencing.

J Z Chen1, L Smith, G P Pfeifer

  • 1Department of Biology, City of Hope National Medical Center and Beckman Research Institute, 1450 East Duarte Road, Duarte, CA 91010, USA. jjchen@nctr.fda.gov

Nucleic Acids Research
|February 13, 2001
PubMed
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This study introduces fluorescent directed termination PCR (DT-PCR), a novel method for precise DNA sequence analysis without traditional dideoxy sequencing. This technique accurately identifies all mutation types, offering a cost-effective alternative for large-scale genetic studies.

Area of Science:

  • Molecular Biology
  • Genetics
  • Biotechnology

Background:

  • Dideoxy DNA sequencing, while established, can be time-consuming and costly for large-scale mutation analysis.
  • Accurate and efficient methods for characterizing nucleotide sequence changes are crucial in genetic research and diagnostics.

Purpose of the Study:

  • To develop and validate a fluorescence-based directed termination PCR (DT-PCR) method for accurate DNA sequence determination.
  • To establish DT-PCR as a cost-effective and efficient alternative to dideoxy sequencing for large-scale mutation detection.

Main Methods:

  • Utilized near-infrared dye-labeled primers in two PCR reactions with low and unbalanced dNTP concentrations.
  • Visualized termination fragments using a dual-dye Li-cor DNA sequencer.
  • Employed complementary reactions with limiting dATP and dCTP to cover the entire target DNA sequence.

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Main Results:

  • Fluorescent DT-PCR accurately determined the nature and position of all substitution mutations in 78 supF reporter gene mutants.
  • The method demonstrated 100% accuracy in mutation characterization and allowed rapid scanning of mutation signatures.
  • Successfully generated a UV-induced mutation spectrum in the supF gene using the DT-PCR method.

Conclusions:

  • Fluorescent DT-PCR provides a simple, accurate, and cost-effective alternative to dideoxy sequencing for large-scale nucleotide sequence analysis.
  • The automated DT-PCR method is suitable for high-throughput mutation characterization and genetic studies.