Phylogeography of Yersinia ruckeri reveals effects of past evolutionary events on the current strain distribution and explains variations in the global transmission of Enteric Redmouth (ERM) disease.
Phylogeographic patterns and population genetic structure of Yersinia ruckeri, the pathological agent of enteric redmouth disease (ERM) in salmonids, were investigated on the basis of concatenated multiloci sequences from isolates of different phenotypes obtained between 1965-2009 from diverse areas...
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doaj-26145918b1ec461abcbe1d633b176ea72020-11-24T20:50:55ZengFrontiers Media S.A.Frontiers in Microbiology1664-302X2015-10-01610.3389/fmicb.2015.01198150780Phylogeography of Yersinia ruckeri reveals effects of past evolutionary events on the current strain distribution and explains variations in the global transmission of Enteric Redmouth (ERM) disease.Asmine eBastardo0Carmen eRavelo1Jesus L Romalde2Universidad de Santiago de CompostelaFundación La Salle de Ciencias NaturalesUniversidad de Santiago de CompostelaPhylogeographic patterns and population genetic structure of Yersinia ruckeri, the pathological agent of enteric redmouth disease (ERM) in salmonids, were investigated on the basis of concatenated multiloci sequences from isolates of different phenotypes obtained between 1965-2009 from diverse areas and hosts. Sequence analyses revealed genetic differentiation among subpopulations with the largest genetic distance occurring between subpopulations of Europe and Canada and/or South America. Bayesian analysis indicated the presence of three ancestral population clusters. Mismatch distribution displayed signatures characteristic of changes in size due to demographic and spatial expansions in the overall Y. ruckeri population, and also in the geographically separate subpopulations. Furthermore, a weak signal of isolation by distance was determined. A significant positive correlation between genetic and geographical distances was observed. These results revealed that the population of Y. ruckeri has undergone both ancient and recent population changes that were probably induced by biogeography forces in the past and, much more recently, by adaptive processes forced by aquaculture expansion. These findings have important implications for future studies on Y. ruckeri population dynamics, on the potential role of genetic structure to explain variations in ERM transmission, and on the effect of past evolutionary events on current estimations of gene flow.http://journal.frontiersin.org/Journal/10.3389/fmicb.2015.01198/fullAquaculturePhylogeographyYersinia ruckeriBayesian AnalysisGenetic structurePopulation changes |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Asmine eBastardo Carmen eRavelo Jesus L Romalde |
spellingShingle |
Asmine eBastardo Carmen eRavelo Jesus L Romalde Phylogeography of Yersinia ruckeri reveals effects of past evolutionary events on the current strain distribution and explains variations in the global transmission of Enteric Redmouth (ERM) disease. Frontiers in Microbiology Aquaculture Phylogeography Yersinia ruckeri Bayesian Analysis Genetic structure Population changes |
author_facet |
Asmine eBastardo Carmen eRavelo Jesus L Romalde |
author_sort |
Asmine eBastardo |
title |
Phylogeography of Yersinia ruckeri reveals effects of past evolutionary events on the current strain distribution and explains variations in the global transmission of Enteric Redmouth (ERM) disease. |
title_short |
Phylogeography of Yersinia ruckeri reveals effects of past evolutionary events on the current strain distribution and explains variations in the global transmission of Enteric Redmouth (ERM) disease. |
title_full |
Phylogeography of Yersinia ruckeri reveals effects of past evolutionary events on the current strain distribution and explains variations in the global transmission of Enteric Redmouth (ERM) disease. |
title_fullStr |
Phylogeography of Yersinia ruckeri reveals effects of past evolutionary events on the current strain distribution and explains variations in the global transmission of Enteric Redmouth (ERM) disease. |
title_full_unstemmed |
Phylogeography of Yersinia ruckeri reveals effects of past evolutionary events on the current strain distribution and explains variations in the global transmission of Enteric Redmouth (ERM) disease. |
title_sort |
phylogeography of yersinia ruckeri reveals effects of past evolutionary events on the current strain distribution and explains variations in the global transmission of enteric redmouth (erm) disease. |
publisher |
Frontiers Media S.A. |
series |
Frontiers in Microbiology |
issn |
1664-302X |
publishDate |
2015-10-01 |
description |
Phylogeographic patterns and population genetic structure of Yersinia ruckeri, the pathological agent of enteric redmouth disease (ERM) in salmonids, were investigated on the basis of concatenated multiloci sequences from isolates of different phenotypes obtained between 1965-2009 from diverse areas and hosts. Sequence analyses revealed genetic differentiation among subpopulations with the largest genetic distance occurring between subpopulations of Europe and Canada and/or South America. Bayesian analysis indicated the presence of three ancestral population clusters. Mismatch distribution displayed signatures characteristic of changes in size due to demographic and spatial expansions in the overall Y. ruckeri population, and also in the geographically separate subpopulations. Furthermore, a weak signal of isolation by distance was determined. A significant positive correlation between genetic and geographical distances was observed. These results revealed that the population of Y. ruckeri has undergone both ancient and recent population changes that were probably induced by biogeography forces in the past and, much more recently, by adaptive processes forced by aquaculture expansion. These findings have important implications for future studies on Y. ruckeri population dynamics, on the potential role of genetic structure to explain variations in ERM transmission, and on the effect of past evolutionary events on current estimations of gene flow. |
topic |
Aquaculture Phylogeography Yersinia ruckeri Bayesian Analysis Genetic structure Population changes |
url |
http://journal.frontiersin.org/Journal/10.3389/fmicb.2015.01198/full |
work_keys_str_mv |
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