The First Lines of Divergence in the Bacteria Domain Were the Hyperthermophilic Organisms, the Thermotogales and the Aquificales, and Not the Mesophilic Planctomycetales.
From: Department of Animal Biology and Genetics, University of Florence, Via Romana 17/19, 50125 Florence, Italy.
Bio Systems
- Publish Date: Jan 2007
- ISSN: 0303-2647
- Volume: 87
- Issue: 1
- Pages: 13-9
- Medium: Print
- Language: English
- Citation (JAMA): Barion Sacha, Franchi Marco, Gallori Enzo, et al. The First Lines of Divergence in the Bacteria Domain Were the Hyperthermophilic Organisms, the Thermotogales and the Aquificales, and Not the Mesophilic Planctomycetales.. BioSystems Jan 2007;87:13-9
Abstract
In order to establish whether the first lines of divergence in the Bacteria domain were the mesophilic or the hyperthermophilic organisms, we have performed a phylogenetic analysis on a concatenamer obtained from the fusion of 20 different proteins. The phylogenetic analysis carried out using five different methods has shown that, contrary to what is reported in the literature [Brochier, C., Philippe, H., 2002. A non-hyperthermophilic ancestor for Bacteria. Nature 417, 244], it was probably the hyperthermophilic organisms, the Thermotogales and the Aquificales, which were the first lines of divergence in the Bacteria domain, and not the mesophilic Planctomycetales. This strengthens the hypothesis that the last universal common ancestor might have been a hyperthermophilic ‘organism’ and that, more generally, life might have originated at high temperature.
Mesh Headings (Keywords): Bacteria, Biogenesis, Likelihood Functions, Phylogeny
Check for Full Text / PubMed Unique Identifier (PMID): 16757099
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