Nesbo, Camilla L. and L'Haridon, Stephane and Stetter, Karl O. and Doolittle, W. Ford (2001) Phylogenetic analyses of two "Archaeal" genes in Thermotoga maritima reveal multiple transfers between Archaea and Bacteria. MOLECULAR BIOLOGY AND EVOLUTION, 18 (3). pp. 362-375. ISSN 0737-4038, 1537-1719
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The genome sequence of Thermotoga maritima revealed that 24% of its open reading frames (ORFs) showed the highest similarity scores to archaeal genes in BLAST analyses. Here we screened 16 strains from the genus Thermotoga and other related Thermotogales for the occurrence of two of these "archaeal" genes: the gene encoding the large subunit of glutamate synthase (gltB) and the mpo-inositol 1P synthase gene (ino1). Both genes were restricted to the Thermotoga species within the Thermotogales. The distribution of the two genes, along with results from phylogenetic analyses, showed that they were acquired from Archaea during the divergence of the Thermotogales. Database searches revealed that three other bacteria-Dehalococcoides ethenogenes, Sinorhizobium meliloti, and Clostridium difficile-possess archaeal-type gltBs, and the phylogenetic analyses confirmed at least two lateral gene transfer (LGT) events between Bacteria and Archaea. These LGT events were also strongly supported by gene structure data, as the three domains in bacterial-type gltB are homologous to three independent ORFs in Archaea and Bacteria with archaeal-type gltBs. The ino1 gene has a scattered distribution among Bacteria, and apart from the Thermotoga strains it is found only in Aquifex aeolicus, D. ethenogenes, and some high-G + C Gram-positive bacteria. Phylogenetic analysis of the ino1 sequences revealed three highly supported prokaryotic clades, all containing a mixture of archaeal and bacterial sequences, and suggested that all bacterial ino1 genes had been recruited from archaeal donors. The Thermotoga strains and A. aeolicus acquired this gene independently from different archaeal species. Although transfer of genes from hyperthermophilic Archaea may have facilitated the evolution of bacterial hyperthermophily, between-domain transfers also affect mesophilic species. For hyperthermophiles, we hypothesize that LGT may be as much a consequence as the cause of adaptation to hyperthermophily.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | COMPLETE GENOME SEQUENCE; GLUTAMATE SYNTHASE; SP-NOV; HYPERTHERMOPHILIC ARCHAEA; ELONGATION-FACTOR; ESCHERICHIA-COLI; RNA-POLYMERASE; RIBOSOMAL-RNA; EVOLUTION; TREE; Thermotoga maritima; lateral gene transfer; glutamate synthase; myo-inositol; 1P synthase; phylogeny |
| Subjects: | 500 Science > 570 Life sciences |
| Divisions: | Biology, Preclinical Medicine > Institut für Biochemie, Genetik und Mikrobiologie > Lehrstuhl für Mikrobiologie (Archaeenzentrum) |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 14 Feb 2022 08:15 |
| Last Modified: | 14 Feb 2022 08:15 |
| URI: | https://pred.uni-regensburg.de/id/eprint/41712 |
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