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A non-radioactive automated method for DNA sequence determination.

W Ansorge, B S Sproat, J Stegemann

    Journal of Biochemical and Biophysical Methods
    |December 1, 1986
    PubMed
    Summary
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    This study introduces a novel, non-radioactive DNA sequencing method using fluorescent primers. This advancement eliminates hazards and costs associated with radioactive materials, improving sample quality and data acquisition efficiency.

    Area of Science:

    • Biochemistry
    • Molecular Biology
    • Genetics

    Background:

    • Traditional radioactive DNA sequencing methods pose hazards and incur high costs.
    • Radioactive labels can degrade sample quality over time.
    • There is a need for safer, more cost-effective DNA sequencing technologies.

    Purpose of the Study:

    • To develop an automated, non-radioactive DNA sequencing method.
    • To overcome the limitations of radioactive labeling in DNA sequencing.
    • To improve the efficiency and safety of DNA sequencing.

    Main Methods:

    • Synthesized a sulfhydryl-containing M13 sequencing primer.
    • Conjugated the primer with tetramethylrhodamine iodoacetamide to create a fluorescent primer.
    • Generated nested sets of fluorescent DNA fragments for sequencing.

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  • Detected fluorescent bands using laser excitation during electrophoresis.
  • Transferred sequence data directly to a computer for analysis.

    • Main Results:

    • Achieved detection limits of approximately 0.1 fmol per band.
    • Utilized standard gel electrophoresis equipment (200 mm wide, 20 sample slots).
    • The instrument contains no moving parts, simplifying its design.
    • Successfully sequenced 250-300 bases within 6 hours.
    • Demonstrated single-base resolution for DNA fragments up to at least 400 bases.

    Conclusions:

    • The developed method offers a safe and efficient alternative to radioactive DNA sequencing.
    • The system provides accurate sequence data with high resolution.
    • This non-radioactive approach has the potential to reduce costs and improve sample integrity in genetic research.