Retchless, A. C., & Lawrence, J. G. (2007). Temporal fragmentation of speciation in bacteria. Science (New York, N.Y.), 317(5841), 1093–6. doi:10.1126/science.1144876 Because bacterial recombination involves the occasional transfer of small DNA fragments between strains, different sets of niche-specific genes may be maintained in populations that freely recombine at other loci. Therefore, genetic isolation may be…
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Zhaxybayeva, O., Swithers, K. S., Lapierre, P., Fournier, G. P., Bickhart, D. M., DeBoy, R. T., Nelson, K. E., et al. (2009). On the chimeric nature, thermophilic origin, and phylogenetic placement of the Thermotogales. Proceedings of the National Academy of Sciences of the United States of America, 106(14), 5865–70. doi:10.1073/pnas.0901260106 Since publication of the first…
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McDaniel, L. D., Young, E., Delaney, J., Ruhnau, F., Ritchie, K. B., & Paul, J. H. (2010). High frequency of horizontal gene transfer in the oceans. Science (New York, N.Y.), 330(6000), 50. doi:10.1126/science.1192243 Oceanic bacteria perform many environmental functions, including biogeochemical cycling of many elements, metabolizing of greenhouse gases, functioning in oceanic food webs (microbial…
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Cadillo-Quiroz, H., Didelot, X., Held, N. L., Herrera, A., Darling, A., Reno, M. L., Krause, D. J., et al. (2012). Patterns of gene flow define species of thermophilic Archaea. PLoS biology, 10(2), e1001265. doi:10.1371/journal.pbio.1001265 Despite a growing appreciation of their vast diversity in nature, mechanisms of speciation are poorly understood in Bacteria and Archaea. Here…
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Barraclough, T. G., Balbi, K. J., & Ellis, R. J. (2012). Evolving Concepts of Bacterial Species. Evolutionary Biology, 39(2), 148–157. doi:10.1007/s11692-012-9181-8 The same evolutionary forces that cause diversification in sexual eukaryotes are expected to cause diversification in bacteria. However, in bacteria, the wider variety of mechanisms for gene exchange (or lack thereof) increases the range…
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Cohan, F. M., & Perry, E. B. (2007). A systematics for discovering the fundamental units of bacterial diversity. Current biology : CB, 17(10), R373–86. doi:10.1016/j.cub.2007.03.032 Bacterial systematists face unique challenges when trying to identify ecologically meaningful units of biological diversity. Whereas plant and animal systematists are guided by a theory-based concept of species, microbiologists have…
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Doolittle, W. F. (2012). Population genomics: how bacterial species form and why they don’t exist. Current biology : CB, 22(11), R451–3. doi:10.1016/j.cub.2012.04.034 Two processes suggested to drive bacterial speciation – periodic selection and recombination – are generally thought to be mutually opposed. Recent work shows that data taken as evidence supporting the former may be…
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Vos, M. (2011). A species concept for bacteria based on adaptive divergence. Trends in microbiology, 19(1), 1–7. doi:10.1016/j.tim.2010.10.003 Bacterial strains are currently grouped into species based on overall genomic similarity and sharing of phenotypes deemed ecologically important. Many believe this polyphasic taxonomy is in need of revision because it lacks grounding in evolutionary theory, and…
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genomica evolutiva 1
Lundberg, D. S., Lebeis, S. L., Paredes, S. H., Yourstone, S., Gehring, J., Malfatti, S., Tremblay, J., et al. (2012). Defining the core Arabidopsis thaliana root microbiome. Nature, 488(7409), 86–90. doi:10.1038/nature11237 Land plants associate with a rootmicrobiota distinct from the com- plexmicrobial community present in surrounding soil. The micro- biota colonizingtherhizosphere (immediately surroundingthe root) and…
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Belda-Ferre, P., Alcaraz, L. D., Cabrera-Rubio, R., Romero, H., Simón-Soro, A., Pignatelli, M., & Mira, A. (2011). The oral metagenome in health and disease. The ISME journal, 1(11), 46–56. doi:10.1038/ismej.2011.85 The oral cavity of humans is inhabited by hundreds of bacterial species and some of them have a key role in the development of oral…
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Human, T., & Project, M. (2012). A framework for human microbiome research. Nature, 486(7402), 215–21. doi:10.1038/nature11209 A variety of microbial communities and their genes (the microbiome) exist throughout the human body, with fundamental roles in human health and disease. The National Institutes of Health (NIH)-funded Human Microbiome Project Consortium has established a population-scale framework to…
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Gajer, P., Brotman, R. M., Bai, G., Sakamoto, J., Schütte, U. M. E., Zhong, X., Koenig, S. S. K., et al. (2012). Temporal dynamics of the human vaginal microbiota. Science translational medicine, 4(132), 132ra52. doi:10.1126/scitranslmed.3003605 Elucidating the factors that impinge on the stability of bacterial communities in the vagina may help in predicting the risk…
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http://www.plosbiology.org/article/info%3Adoi%2F10.1371%2Fjournal.pbio.0050077 Abstract: The world’s oceans contain a complex mixture of micro-organisms that are for the most part, uncharacterized both genetically and biochemically. We report here a metagenomic study of the marine planktonic microbiota in which surface (mostly marine) water samples were analyzed as part of the Sorcerer II Global Ocean Sampling expedition. These samples, collected…
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