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Tnr8, a foldback transposable element from rice.

C Cheng1, S Tsuchimoto, H Ohtsubo

  • 1Institute of Molecular and Cellular Biosciences, University of Tokyo, Bunkyo-ku, Tokyo 113-0032, Japan.

Genes & Genetic Systems
|March 31, 2001
PubMed
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A novel rice transposable element, Tnr8, was identified in Oryza glaberrima. This element, characterized by long terminal inverted repeats, shows evidence of transposition and potential involvement in rice genome rearrangements.

Area of Science:

  • Genetics
  • Molecular Biology
  • Plant Science

Background:

  • Retroposons and transposable elements play crucial roles in genome evolution.
  • Understanding the diversity and activity of transposable elements in rice is essential for crop improvement.

Purpose of the Study:

  • To identify and characterize novel transposable elements in the rice genome.
  • To investigate the evolutionary history and potential activity of the identified element.

Main Methods:

  • Identification of an insertion sequence within a rice retroposon (p-SINE1).
  • Sequence analysis to determine structural features, including long terminal inverted repeats (TIRs) and flanking direct repeats.
  • Homology searches and PCR analysis to assess the distribution and variation of the element in the rice genome.

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Main Results:

  • Discovery of a 418 bp insertion sequence, named Tnr8, in Oryza glaberrima.
  • Tnr8 exhibits structural characteristics of a foldback transposable element, including TIRs with tandem repeats.
  • A large family of Tnr8 members with variations exists in the rice genome.
  • Some Tnr8 members are absent in certain AA genome rice species, indicating ancient and potentially more recent transposition events.

Conclusions:

  • Tnr8 represents a novel rice transposable element with unique structural features.
  • The Tnr8 family has a complex transpositional history, with ancient and post-divergence mobilization events.
  • Tnr8 elements are likely contributors to rice genome rearrangements and evolution.