1. Friedman, J., Alm, E. & Shapiro, B. Sympatric speciation: when is it possible in bacteria? PloS one (2013).at Abstract According to theory, sympatric speciation in sexual eukaryotes is favored when relatively few loci in the genome are sufficient for reproductive isolation and adaptation to different niches. Here we show a similar result for clonally…
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Population Genomics of Early Events in the Ecological Differentiation of Bacteria DOI: 10.1126/science.1218198 Science 336, 48 (2012); B. Jesse Shapiro et al. Genetic exchange is common among bacteria, but its effect on population diversity during ecological differentiation remains controversial. A fundamental question is whether advantageous mutations lead to selection of clonal genomes or, as in…
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Resource Partitioning and Sympatric Differentiation Among Closely Related Bacterioplankton DOI: 10.1126/science.1157890 Science 320, 1081 (2008); Dana E. Hunt et al. Identifying ecologically differentiated populations within complex microbial communities remains challenging, yet is critical for interpreting the evolution and ecology of microbes in the wild. Here we describe spatial and temporal resource partitioning among Vibrionaceae strains…
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1. Wielgoss, S. & Barrick, J. Mutation rate dynamics in a bacterial population reflect tension between adaptation and genetic load. PNAS 3, (2013). Mutations are the ultimate source of heritable variation for evolu- tion. Understanding how mutation rates themselves evolve is thus essential for quantitatively understanding many evolutionary processes. According to theory, mutation rates should…
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Blount, Z. D., Barrick, J. E., Davidson, C. J. & Lenski, R. E. Genomic analysis of a key innovation in an experimental Escherichia coli population. Nature 489, 513–8 (2012). Evolutionary novelties have been important in the history of life, but their origins are usually difficult to examine in detail. We previously described the evolution of…
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Olivier Tenaillon, et al. Science 335, 457 (2012); DOI: 10.1126/science.1212986 To estimate the number and diversity of beneficial mutations, we experimentally evolved 115 populations of Escherichia coli to 42.2°C for 2000 generations and sequenced one genome from each population. We identified 1331 total mutations, affecting more than 600 different sites. Few mutations were shared…
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Second-Order Selection for Evolvability in a Large Escherichia coli Population. Robert J. Woods, et al. Science 331, 1433 (2011); In theory, competition between asexual lineages can lead to second-order selection for greate revolutionary potential. To test this hypothesis, we revived a frozen population of Escherichia coli from a long-term evolution experiment and compared the fitness…
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Mutation Rate Inferred From Synonymous Substitutions in a Long-Term Evolution Experiment With Escherichia coli. Wielgoss, Sébastien; Barrick, Jeffrey E; Tenaillon, Olivier; Cruveiller, Stéphane; Chane-Woon-Ming, Béatrice et al. (2011) G3 (Bethesda, Md.) vol. 1 (3) p. 183-186 ABSTRACT The quantification of spontaneous mutation rates is crucial for a mechanistic understanding of the evolutionary process. In…
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Herron MD, Doebeli M (2013) Parallel Evolutionary Dynamics of Adaptive Diversification in Escherichia coli. PLoS Biol 11(2): e1001490. doi:10.1371/journal.pbio.1001490 Abstract The causes and mechanisms of evolutionary diversification are central issues in biology. Geographic isolation is the traditional explanation for diversification, but recent theoretical and empirical studies have shown that frequency-dependent selection can drive diversification without…
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Trends Microbiol. 2011 Jan;19(1):1-7. doi: 10.1016/j.tim.2010.10.003. Epub 2010 Nov 9. Abstract 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 boundaries between species are arbitrary. Recent taxonomy…
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Chan, J., & Halachev, M. (2012). Defining bacterial species in the genomic era: insights from the genus Acinetobacter. BMC microbiology, 0(758), 3–11. Retrieved from http://www.biomedcentral.com/1471-2180/12/302/ Abstract Background Microbial taxonomy remains a conservative discipline, relying on phenotypic information derived from growth in pure culture and techniques that are time-consuming and difficult to standardize, particularly when compared…
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Peña, A., Teeling, H., Huerta-Cepas, J., Santos, F., Yarza, P., Brito-Echeverría, J., Lucio, M., et al. (2010). Fine-scale evolution: genomic, phenotypic and ecological differentiation in two coexisting Salinibacter ruber strains. The ISME journal, 4(7), 882–95. doi:10.1038/ismej.2010.6 Genomic and metagenomic data indicate a high degree of genomic variation within microbial populations, although the ecological and evolutive…
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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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