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Automated low-redundancy large-scale DNA sequencing by primer walking
H Voss1, S Wiemann, D Grothues
1European Molecular Biology Laboratory, Heidelberg, FRG.
Biotechniques
|October 1, 1993
Summary
Automated DNA sequencing using primer walking achieves high accuracy with low redundancy. This method efficiently sequences large DNA molecules like plasmids and cosmids, reducing errors and costs.
Area of Science:
- Molecular Biology
- Genomics
- Biotechnology
Background:
- Primer walking is a key technique for DNA sequencing.
- Sequencing large DNA fragments like cosmids presents challenges in efficiency and accuracy.
- Current methods may require high redundancy, increasing costs and time.
Purpose of the Study:
- To describe a low-redundancy automated DNA sequencing method using primer walking.
- To demonstrate the efficiency and accuracy of this method for large DNA molecules.
- To reduce the cost and complexity of DNA sequencing projects.
Main Methods:
- Utilized T7 DNA polymerase and computer-selected walking primers.
- Employed fluorescein-dATP as an internal label for standard DNA sequencers.
- Sequenced large plasmids and cosmids with low redundancy (2-3x).
- Synthesized primer sets on the EMBL multiple segmental DNA synthesizer.
- Implemented simultaneous walking on both DNA strands for improved accuracy.
Main Results:
- Achieved an error rate below 1% for up to 500 bases in raw data.
- Successfully sequenced 20 kb of cosmid insert with 2.7x redundancy.
- Demonstrated >95% efficiency in primer walking reactions.
- Linked neighboring plasmid subclones via direct cosmid sequencing.
- Confirmed sequence data accuracy by walking on opposite strands.
Conclusions:
- Low-redundancy automated DNA sequencing by primer walking is a viable and efficient method.
- This approach significantly reduces errors and redundancy in sequencing large DNA constructs.
- The method offers cost-effectiveness and improved accuracy for genomic projects.