Journal
EXTREMOPHILES
Volume 15, Issue 4, Pages 509-516Publisher
SPRINGER TOKYO
DOI: 10.1007/s00792-011-0381-4
Keywords
Thermotogaceae; Phenotypic evolution; Temperature optimum; Microbial ecology; Trait prediction; Thermophiles
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Quantitative characterization of the mode and rate of phenotypic evolution is rarely applied to prokaryotes. Here, we present an analysis of temperature optimum (T (opt)) evolution in the thermophilic family Thermotogaceae, which has a large number of cultured representatives. We use log-rate-interval analysis to show that T (opt) evolution in Thermotogaceae is consistent with a Brownian motion (BM) evolutionary model. The properties of the BM model are used to a establish confidence intervals on the unknown phenotypic trait value of an uncultured organism, given its distance to a close relative with known trait value. Cross-validation by bootstrapping indicates that the predictions are robust.
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