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Related Experiment Videos

Strategy and methods for directly sequencing cosmid clones.

D R Siemieniak1, L C Sieu, J L Slightom

  • 1Molecular Biology Research-Unit 7242, Upjohn Company, Kalamazoo, Michigan 49007.

Analytical Biochemistry
|February 1, 1991
PubMed
Summary

This study presents a novel strategy for sequencing large DNA molecules, specifically cosmid clones, using primer-directed enzymatic DNA sequencing. The developed method enables complete cosmid sequencing without subcloning, improving efficiency and accuracy for genomic research.

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Area of Science:

  • Molecular Biology
  • Genomics
  • Biotechnology

Background:

  • Primer-directed enzymatic sequencing is crucial for DNA analysis.
  • Sequencing large DNA molecules like cosmids presents significant challenges.
  • Existing methods often require subcloning, increasing complexity and time.

Purpose of the Study:

  • To develop a strategy for complete cosmid clone sequencing.
  • To optimize primer-directed enzymatic sequencing for large DNA fragments.
  • To eliminate the need for subcloning in cosmid sequencing.

Main Methods:

  • Combined chemical sequencing for initiation points and primer-directed enzymatic sequencing for extension.
  • Modified T7 sequencing protocol with a nucleotide "chase" solution.

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  • Utilized [alpha-32P]-dATP and -dCTP for radiolabeling.
  • Employed a 1-m gel system for fragment separation and reading.

    • Main Results:

    • Routine extension of sequencing reactions beyond 1000 bp.
    • Minimized film exposure times to 24–48 hours.
    • Accurate reading of DNA fragments up to 800 bp with <0.5% error.
    • Successful complete sequencing of cosmid clones without subcloning.

    Conclusions:

    • The presented strategy and techniques allow for efficient and accurate complete sequencing of cosmid clones.
    • This method significantly advances the direct sequencing of large DNA molecules.
    • Eliminates the necessity of subcloning, streamlining genomic research workflows.