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A single-fluor approach to DNA sequence determination using high performance capillary electrophoresis.
S L Pentoney1, K D Konrad, W Kaye
1Advanced Development Unit, Beckman Instruments, Inc., Fullerton, CA 92634.
Electrophoresis
|August 11, 1992
Summary
This study simplifies DNA sequencing using a modified Tabor and Richardson strategy with capillary electrophoresis. The new method enhances accuracy and efficiency by using fewer terminators and combining complementary data sets.
Area of Science:
- Molecular Biology
- Biotechnology
- Genomics
Background:
- The Tabor and Richardson strategy is a cornerstone of enzymatic chain termination DNA sequencing.
- High-performance capillary gel electrophoresis (HPCE) with laser-induced fluorescence (LIF) detection offers advanced DNA analysis capabilities.
- Existing DNA sequencing methods can be time-consuming and require complex instrumentation.
Purpose of the Study:
- To adapt the Tabor and Richardson DNA sequencing strategy for HPCE with LIF detection.
- To develop a simplified and more efficient DNA sequencing approach.
- To reduce the complexity and cost of DNA sequencing instrumentation.
Main Methods:
- Adaptation of the Tabor and Richardson enzymatic chain termination sequencing strategy.
- Utilized high-performance capillary gel electrophoresis with laser-induced fluorescence detection.
- Employed a modified approach with two reactions, each containing complementary mixtures of three dideoxynucleotide triphosphates (ddNTPs) in a 4:2:1 concentration ratio.
Main Results:
- Successful adaptation of the sequencing strategy to HPCE with LIF detection, using a single fluorophore.
- DNA sequence determination based on relative peak height and assignment of missing ddNTPs to inter-peak gaps.
- Combined data from two complementary reaction mixes to enhance sequence call confidence and accuracy.
Conclusions:
- The modified strategy significantly reduces DNA sequencing time and simplifies instrumentation requirements.
- Using only three terminators per reaction streamlines software analysis and optimizes dynamic range utilization.
- This approach improves error elimination from non-uniform ddNTP incorporation or false terminations and aids in reading compressed electropherogram regions.