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Factors acting on Mos1 transposition efficiency.

Ludivine Sinzelle1, Gwenhael Jégot, Benjamin Brillet

  • 1Université François Rabelais de Tours, GICC, UFR des Sciences & Techniques, Parc Grandmont, 37200 Tours, France. sinzellel@yahoo.fr

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Mariner-like elements (MLEs) transposition efficiency is influenced by DNA sequence, length, and super-helicity. Experimental conditions significantly impact transposition outcomes, with auto-integration limiting efficiency in vitro.

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Area of Science:

  • Genomics
  • Molecular Biology
  • Transposable Elements

Background:

  • Mariner-like elements (MLEs) are common DNA transposons found in animal genomes.
  • In vitro transposition requires only transposase, but host, environmental, and transposon sequence factors can affect in vivo transposition.

Purpose of the Study:

  • To investigate factors influencing the transposition of Mos1, a Mariner-like element.
  • To demonstrate in vitro transposition of MITEs (Miniature Inverted-repeat Transposable Elements) derived from MLEs.
  • To explore the impact of experimental conditions on MLE transposition.

Main Methods:

  • In vitro transposition assays using Mos1 and MLE-derived MITEs.
  • Analysis of DNA stuffer sequence (GC content, length) and super-helicity effects.
  • Temperature variation to assess transposition regulation.

Main Results:

  • Mos1 transposition efficiency depends on DNA stuffer GC content and length.
  • Successfully demonstrated in vitro transposition of small MITEs (80-120 bp).
  • High temperatures reduce Mos1 transposition, leading to non-integrating products; DNA super-helicity significantly impacts efficiency.

Conclusions:

  • Experimental conditions can significantly alter the interpretation of mariner excision frequency and quality.
  • The auto-integration pathway limits in vitro transposition efficiency to new sites, a phenomenon potentially relevant in natural hosts.
  • A model for small transposon transposition that circumvents DNA bending constraints is proposed.