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[Colony and phage-plaque direct sequencings by dye-terminator methods]
1Center for Research and Education, Room C10, Osaka University Medical School, 2-2 Yamadaoka, Suita, Osaka 565-0871, Japan.
Yakugaku Zasshi : Journal of the Pharmaceutical Society of Japan
|September 18, 2001
Summary
Direct colony sequencing using dye terminators provides 500 base pairs of sequence data from E. coli colonies. This method offers rapid screening of genomic and cDNA libraries.
Area of Science:
- Molecular Biology
- Genomics
Background:
- Direct sequencing of DNA is crucial for genetic analysis.
- Existing methods like radioactive or dye-primer sequencing have limitations.
Purpose of the Study:
- To develop and evaluate a direct colony sequencing strategy using dye terminators and dye primers.
- To assess the efficiency of this method for sequencing lambda phage DNA and E. coli colonies.
Main Methods:
- Utilized the BigDye terminator kit combined with dye primer sequencing for direct colony sequencing.
- Sequenced single E. coli colonies containing plasmid DNA and lambda phage plaques.
- Optimized template amounts for purified lambda DNA and lambda phage suspensions.
Main Results:
- Single-colony sequencing yielded approximately 500 base pairs of sequence information.
- Increasing cycle numbers beyond a certain point did not improve signal strength.
- Plaque sequencing yielded about 300 base pairs using two cycles of sequencing.
- The BigDye terminator method detected lower template amounts compared to standard protocols.
Conclusions:
- Direct colony and plaque sequencing are effective for rapid, high-throughput screening of genomic and cDNA libraries.
- This optimized method enhances efficiency in molecular biology applications.
- The technique provides valuable sequence data from microbial colonies and phage plaques.