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Author (up) Quintero-Galvis, J.F.; Paleo-Lopez, R.; Solano-Iguaran, J.J.; Poupin, M.J.; Ledger, T.; Gaitan-Espitia, J.D.; Antol, A.; Travisano, M.; Nespolo, R.F. pdf  doi
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  Title Exploring the evolution of multicellularity in Saccharomyces cerevisiae under bacteria environment: An experimental phylogenetics approach Type Journal Article
  Year 2018 Publication Ecology And Evolution Abbreviated Journal Ecol. Evol.  
  Volume 8 Issue 9 Pages 4619-4630  
  Keywords clonal multicellularity; experimental evolution; multicellularity; social multicellularity; yeasts  
  Abstract There have been over 25 independent unicellular to multicellular evolutionary transitions, which have been transformational in the complexity of life. All of these transitions likely occurred in communities numerically dominated by unicellular organisms, mostly bacteria. Hence, it is reasonable to expect that bacteria were involved in generating the ecological conditions that promoted the stability and proliferation of the first multicellular forms as protective units. In this study, we addressed this problem by analyzing the occurrence of multicellularity in an experimental phylogeny of yeasts (Sacharomyces cerevisiae) a model organism that is unicellular but can generate multicellular clusters under some conditions. We exposed a single ancestral population to periodic divergences, coevolving with a cocktail of environmental bacteria that were inoculated to the environment of the ancestor, and compared to a control (no bacteria). We quantified culturable microorganisms to the level of genera, finding up to 20 taxa (all bacteria) that competed with the yeasts during diversification. After 600 generations of coevolution, the yeasts produced two types of multicellular clusters: clonal and aggregative. Whereas clonal clusters were present in both treatments, aggregative clusters were only present under the bacteria treatment and showed significant phylogenetic signal. However, clonal clusters showed different properties if bacteria were present as follows: They were more abundant and significantly smaller than in the control. These results indicate that bacteria are important modulators of the occurrence of multicellularity, providing support to the idea that they generated the ecological conditions-promoting multicellularity.  
  Address [Quintero-Galvis, Julian F.; Paleo-Lopez, Rocio; Solano-Iguaran, Jaiber J.; Nespolo, Roberto F.] Univ Austral Chile, Inst Ciencias Ambientales & Evolut, Valdivia, Chile, Email: robertonespolorossi@gmail.com  
  Corporate Author Thesis  
  Publisher Wiley Place of Publication Editor  
  Language English Summary Language Original Title  
  Series Editor Series Title Abbreviated Series Title  
  Series Volume Series Issue Edition  
  ISSN 2045-7758 ISBN Medium  
  Area Expedition Conference  
  Notes WOS:000431987300024 Approved no  
  Call Number UAI @ eduardo.moreno @ Serial 856  
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