A genomic timescale of prokaryote evolution: insights into the origin of methanogenesis,phototrophy, and the colonization of land |
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Authors: | Fabia?U?Battistuzzi Andreia?Feijao Email author" target="_blank">S?Blair?HedgesEmail author |
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Institution: | (1) NASA Astrobiology Institute and Department of Biology, 208 Mueller Laboratory, The Pennsylvania State University, University Park, PA, 16802, USA;(2) European Molecular Biology Laboratory, Meyerhofstrasse 1, 69117 Heidelberg, Germany |
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Abstract: | Background The timescale of prokaryote evolution has been difficult to reconstruct because of a limited fossil record and complexities
associated with molecular clocks and deep divergences. However, the relatively large number of genome sequences currently
available has provided a better opportunity to control for potential biases such as horizontal gene transfer and rate differences
among lineages. We assembled a data set of sequences from 32 proteins (~7600 amino acids) common to 72 species and estimated
phylogenetic relationships and divergence times with a local clock method. |
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Keywords: | |
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