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Related Experiment Videos

Do transposable elements really contribute to proteomes?

Valer Gotea1, Wojciech Makałowski

  • 1Institute of Molecular Evolutionary Genetics and Department of Biology, Center for Comparative Genomics and Bioinformatics, The Pennsylvania State University, University Park, PA 16802, USA.

Trends in Genetics : TIG
|March 30, 2006
PubMed
Summary

Transposable elements (TEs) are not junk DNA; they have regulatory roles and can be incorporated into proteins. However, protein-encoded TE fragments are rare and derived from ancient TEs, not recent ones.

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Area of Science:

  • Genomics
  • Molecular Biology
  • Evolutionary Biology

Background:

  • Transposable elements (TEs) were historically considered non-functional 'junk' DNA.
  • Emerging evidence suggests TEs possess regulatory functions and contribute to gene coding regions at the transcript level.

Purpose of the Study:

  • To investigate the translational evidence of transposable element (TE) cassette incorporation into proteins.
  • To determine the prevalence and age of TE-derived fragments in functional proteins.

Main Methods:

  • Analysis of protein databases to identify TE-encoded fragments.
  • Comparison of transcript-level TE contribution versus protein-level TE contribution.
  • Age determination of incorporated TE sequences.

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Main Results:

  • Approximately 0.1% of proteins contain TE-encoded fragments, potentially an underestimate.
  • This is significantly lower than the approximately 4% observed at the transcript level.
  • All identified TE fragments in proteins originated from ancient TEs.

Conclusions:

  • The exaptation of TE fragments into functional proteins is a lengthy evolutionary process.
  • Functional proteins are unlikely to incorporate fragments from young TEs.
  • The primary role of young TEs may be regulatory, while older TEs can be integrated into protein structures.