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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Erra, Fabrizio Vallesi, Adriana Dini, Fernando Luporini, Pierangelo Pedrini, Bill Wüthrich, Kurt Di Giuseppe, Graziano Alimenti, Claudio |
| Spatial Coverage | Arctic Regions |
| Description | Author Affiliation: Di Giuseppe G ( Dipartimento di Biologia, University of Pisa, 56126 Pisa, Italy.); |
| 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. |
| ISSN | 00278424 |
| e-ISSN | 10916490 |
| Journal | Proceedings of the National Academy of Sciences of the United States of America |
| Issue Number | 8 |
| Volume Number | 108 |
| Language | English |
| Publisher | National Academy of Sciences |
| Publisher Date | 2011-03-01 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Cell Communication Physiology Euplotes Pheromones Reproduction Antarctic Regions Arctic Regions Classification Magnetic Resonance Spectroscopy Molecular Structure Chemistry Phylogeny Signal Transduction Research Support, Non-U.S. Gov't Multidisciplinary |
| Content Type | Text |
| Resource Type | Article |
| Subject | Multidisciplinary |
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