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Related Experiment Videos

Nonrandom orientation of transposon Tn5supF insertions in phage lambda.

D Kersulyte1, B R Krishnan, D E Berg

  • 1Department of Molecular Microbiology, Washington University Medical School, St. Louis, MO 63110.

Gene
|May 1, 1992
PubMed
Summary

Transposition of the Tn5supF mini-transposon into phage lambda shows orientation bias during selection. This bias, favoring supF transcription from lambda promoters, is useful for DNA sequencing template preparation.

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Area of Science:

  • Molecular Biology
  • Genetics
  • Microbiology

Background:

  • Mini-transposons like Tn5supF facilitate genetic manipulation by integrating DNA sequences into target genomes.
  • Phage lambda serves as a model system for studying transposition and genetic engineering due to its well-characterized biology.

Purpose of the Study:

  • To investigate the orientation preferences of Tn5supF transposition into phage lambda.
  • To explore the utility of orientation-biased transposition for molecular biology applications, such as DNA sequencing.

Main Methods:

  • Isolation and mapping of Tn5supF insertions in phage lambda clones using polymerase chain reaction (PCR) amplification.
  • Selection of transposon insertions through two distinct methods: lytic growth plaque formation and lysogenization-based transduction.

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Main Results:

  • Over 90% of Tn5supF insertions selected during lytic growth were oriented for transcription from an upstream lambda promoter.
  • Insertions selected via transduction showed no orientation preference, with approximately 50% in each orientation.
  • Phages with colliding lambda and supF promoter orientations were less frequently recovered during lytic selection.

Conclusions:

  • Tn5supF transposition occurs with equal frequency in both orientations, but selection methods introduce an observed bias.
  • The orientation bias observed during lytic selection is advantageous for generating DNA sequencing templates using transposon-based methods.