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Dynamic evolution at pericentromeres.

Anne E Hall1, Gregory C Kettler, Daphne Preuss

  • 1Howard Hughes Medical Institute, The University of Chicago, Chicago, Illinois 60637, USA.

Genome Research
|February 8, 2006
PubMed
Summary
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Plant pericentromeres evolve rapidly, showing dynamic structural changes and sequence content unlike animal pericentromeres. These regions tolerate large insertions, suggesting distinct evolutionary pressures from euchromatin.

Area of Science:

  • * Plant genomics and evolutionary biology.
  • * Comparative genomics of flowering plants.

Background:

  • * Pericentromeres are unique genomic regions with distinct evolutionary patterns in animals and plants.
  • * Plant pericentromeres are known to undergo rearrangements and insertions not typical of euchromatin.

Purpose of the Study:

  • * To investigate the mechanisms and patterns of plant pericentromere evolution.
  • * To compare pericentromere sequences in four closely related Brassicaceae species.

Main Methods:

  • * Comparative sequence analysis of homologous pericentromeric regions (peri-CENs III and V) in Arabidopsis arenosa, Capsella rubella, and Olimarabidopsis pumila.
  • * Fluorescence in situ hybridization (FISH) to confirm pericentromere maintenance near centromere satellite arrays.
  • * Analysis of gene conservation, intergenic length, sequence content, and gene density.

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Main Results:

  • * Highly conserved genes were identified, but significant differences in intergenic length and species-specific sequence content were observed.
  • * Arabidopsis thaliana pericentromeres showed recent, large expansions (hundreds of kilobases), contrasting with minor changes in euchromatic segments.
  • * Plant pericentromeres accommodate duplications, mobile elements, 5S rDNA arrays, and pseudogenes, but lack extensive segmental duplications seen in primates.

Conclusions:

  • * Plant pericentromeres exhibit rapid, dynamic structural and sequence evolution.
  • * These regions may be under distinct selective pressures compared to euchromatin, allowing for substantial structural plasticity.
  • * The findings challenge the notion of pericentromeric stasis and highlight unique plant genome dynamics.