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Antarctic and Arctic populations of the ciliate Euplotes nobilii show common pheromone-mediated cell-cell signaling and cross-mating

Academic Article
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Overview

authors

  • Di Giuseppe, G.
  • Erra, F.
  • Dini, F.
  • Alimenti, C.
  • Vallesi, A.
  • Pedrini, B.
  • Wuthrich, Kurt
  • Luporini, P.

publication date

  • February 2011

journal

  • Proceedings of the National Academy of Sciences of the United States of America  Journal

abstract

  • Wild-type strains of the protozoan ciliate Euplotes collected from different locations on the coasts of Antarctica, Tierra del Fuego and the Arctic were taxonomically identified as the morpho-species Euplotes nobilii, based on morphometric and phylogenetic analyses. Subsequent studies of their sexual interactions revealed that mating combinations of Antarctic and Arctic strains form stable pairs of conjugant cells. These conjugant pairs were isolated and shown to complete mutual gene exchange and cross-fertilization. The biological significance of this finding was further substantiated by demonstrating that close homology exists among the three-dimensional structures determined by NMR of the water-borne signaling pheromones that are constitutively secreted into the extracellular space by these interbreeding strains, in which these molecules trigger the switch between the growth stage and the sexual stage of the life cycle. The fact that Antarctic and Arctic E. nobilii populations share the same gene pool and belong to the same biological species provides new support to the biogeographic model of global distribution of eukaryotic microorganisms, which had so far been based exclusively on studies of morphological and phylogenetic taxonomy.

subject areas

  • Antarctic Regions
  • Arctic Regions
  • Cell Communication
  • Classification
  • Euplotes
  • Magnetic Resonance Spectroscopy
  • Molecular Structure
  • Pheromones
  • Phylogeny
  • Reproduction
  • Signal Transduction
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Research

keywords

  • NMR structures
  • ciliate mating types and sexual interactions
  • microbial ecology
  • polar biology
  • signaling by water-borne pheromones
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Identity

PubMed Central ID

  • PMC3044361

International Standard Serial Number (ISSN)

  • 0027-8424

Digital Object Identifier (DOI)

  • 10.1073/pnas.1019432108

PubMed ID

  • 21300903
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Additional Document Info

start page

  • 3181

end page

  • 3186

volume

  • 108

issue

  • 8

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