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Transposable elements and the evolution of gene expression.

S R Wessler1

  • 1Department of Botany, University of Georgia, Athens 30602, USA.

Symposia of the Society for Experimental Biology
|January 25, 2000
PubMed
Summary

Transposable elements (TEs) significantly impact plant genomes, causing mutations in genes like maize waxy and R. New research explores the association of miniature inverted-repeat transposable elements (MITEs) with plant genes, suggesting TEs occupy specific genomic niches.

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Area of Science:

  • Plant Genomics
  • Molecular Biology
  • Genetics

Background:

  • Plant genomes contain vast numbers of transposable elements (TEs).
  • TEs can influence host genome evolution through insertions and mutations.
  • Understanding TE-host interactions is crucial for plant genetics.

Purpose of the Study:

  • To characterize mutations in maize waxy and R genes caused by transposable element (TE) insertions.
  • To review the association between miniature inverted-repeat transposable elements (MITEs) and normal plant genes.
  • To discuss the genomic niche adaptation of different TE classes in maize.

Main Methods:

  • Characterization of mutations in specific maize genes (waxy and R).
  • Analysis of transposable element (TE) insertion events.
  • Review of existing literature on miniature inverted-repeat transposable elements (MITEs) and their association with plant genes.

Main Results:

  • TE insertions were identified as causative agents for mutations in maize waxy and R genes.
  • A novel class of TEs, MITEs, shows association with normal plant genes.
  • Evidence suggests distinct classes of TEs occupy specific genomic niches within the maize genome.

Conclusions:

  • Transposable elements (TEs) play a significant role in shaping plant genomes through mutation induction.
  • Miniature inverted-repeat transposable elements (MITEs) may have specific functional associations with plant genes.
  • The maize genome exhibits compartmentalization, with different TE classes occupying specialized niches.

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