For the first time, researchers have demonstrated direct evidence of two polar populations of a microorganism -- one in the Arctic and the other in the Antarctic -- successfully mating and sharing the same gene pool, researchers linkurl:report this week; in the Proceedings of the National Academy of Sciences.
Ronald Corner,;,1607,7-135-3313_3683_3720-58397--,00.html
The unique species likely overcomes its geographic divide by traveling along deep ocean currents, the authors report.linkurl:Pierangelo Luporini; and colleagues at the University of Camerino in Italy analyzed strains of Euplotes nobilii -- a protozoan ciliate aptly named from a Greek term meaning "good swimmer" or "good sailor" -- and observed 3 strains from the Arctic and 3 from the Antarctic that successfully mated through conjugation, the direct exchange of genes, and produced viable offspring. The strains also shared structurally similar pheromones -- signaling hormones vital for cell-to-cell recognition and mating -- identified by NMR spectroscopy in...
The Scientist. Di Giuseppe, G. et al., "Antarctic and Arctic populations of the ciliate Euplotes nobilii show common pheromone-mediated cell-cell signaling and cross-mating," PNAS, doi:10.1073/pnas.1019432108.

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