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Multiwavelength fluorescence detection for DNA sequencing using capillary electrophoresis.
A E Karger1, J M Harris, R F Gesteland
1University of Utah, Department of Human Genetics, Salt Lake City.
Nucleic Acids Research
|September 25, 1991
Summary
This study introduces multiwavelength detection for DNA sequencing using laser-induced fluorescence and capillary electrophoresis. This method enhances analytical selectivity and reduces base assignment errors for accurate DNA sequence determination.
Area of Science:
- Biotechnology
- Analytical Chemistry
- Genomics
Background:
- DNA sequencing is crucial for genetic analysis.
- Capillary gel electrophoresis (CGE) offers high-throughput separation.
- Sensitive detection methods are needed for accurate DNA sequencing.
Purpose of the Study:
- To develop and evaluate a multiwavelength detection system for DNA sequencing.
- To assess the performance of a charge-coupled device (CCD) detector in CGE.
- To improve analytical selectivity and reduce errors in DNA sequencing.
Main Methods:
- Multiwavelength detection of laser-induced fluorescence with four fluorophores.
- Separation using capillary gel electrophoresis.
- Detection with a cryogenically cooled, 2D CCD detector for on-line emission spectra recording.
Main Results:
- The CCD detector achieved high sensitivity with a 94% duty cycle.
- Multiwavelength detection demonstrated superior analytical selectivity compared to bandpass filters.
- Base assignment errors were reduced by using entire emission spectra for peak identification.
Conclusions:
- The developed multiwavelength detection system is highly sensitive and selective for capillary DNA sequencing.
- The CCD detector enables efficient, on-line spectral recording without moving parts.
- This approach reduces errors and maintains accuracy comparable to traditional methods.