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Related Experiment Videos

Mutator-like elements in Arabidopsis thaliana. Structure, diversity and evolution.

Z Yu1, S I Wright, T E Bureau

  • 1Department of Biology, McGill University, Montreal, Quebec, H3A 1B1 Canada.

Genetics
|December 5, 2000
PubMed
Summary

Class II transposable elements, Mutator-like elements (MULEs), show significant diversity in structure and sequence within Arabidopsis thaliana. These elements may retain transpositional activity and acquire host DNA, impacting evolution.

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Area of Science:

  • Genetics
  • Molecular Biology
  • Plant Science

Background:

  • Genome-wide studies of mobile genetic elements primarily focus on Class I elements.
  • Limited information exists regarding the diversity and nature of Class II transposable elements at a large scale.

Purpose of the Study:

  • To analyze the sequence and structural diversity of Mutator-like elements (MULEs) in the Arabidopsis thaliana genome.
  • To understand the evolutionary dynamics and potential transpositional activity of MULEs.

Main Methods:

  • Sequence similarity searches and characterization of MULEs.
  • Multiple nucleotide and amino acid sequence alignments.
  • Phylogenetic analyses based on nucleotide sequence data.

Main Results:

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  • MULEs in Arabidopsis thaliana exhibit extreme heterogeneity in structure, sequence, and size.
  • Conserved sequence motifs potentially related to transposition were identified.
  • Some MULE groups lack characteristic long terminal inverted repeats found in maize Mu elements.
  • Phylogenetic analyses suggest independent evolution of multiple MULE lineages and potential transpositional competence.
  • Evidence indicates MULEs can acquire host DNA segments.

Conclusions:

  • Arabidopsis thaliana MULEs are structurally and sequentially diverse, with some retaining transpositional capabilities.
  • Independent evolution of MULE lineages over long periods is suggested.
  • The ability of MULEs to acquire host DNA has implications for host and element adaptive evolution.