The Universal Ancestor and the Ancestor of Bacteria Were Hyperthermophiles

@article{Giulio2003TheU,
  title={
The Universal Ancestor and the Ancestor of Bacteria Were Hyperthermophiles
},
  author={Massimo Di Giulio},
  journal={Journal of Molecular Evolution},
  year={2003},
  volume={57},
  pages={721-730}
}
  • M. Giulio
  • Published 2003
  • Biology
  • Journal of Molecular Evolution
The definition of the node of the last universal common ancestor (LUCA) is justified in a topology of the unrooted universal tree. This definition allows previous analyses based on paralogous proteins to be extended to orthologous ones. In particular, the use of a thermophily index (based on the amino acids’ propensity to enter the [hyper] thermophile proteins more frequently) and its correlation with the optimal growth temperature of the various organisms allow inferences to be made on the… Expand

Figures from this paper

The universal ancestor and the ancestors of Archaea and Bacteria were anaerobes whereas the ancestor of the Eukarya domain was an aerobe
TLDR
The LUCA was an anaerobic ‘organism’, as were the ancestors of Archaea and Bacteria, whereas the ancestor of Eukarya was an aerobe, according to the reconstructed ancestral sequences of proteins. Expand
The Universal Ancestor and the Ancestors of Archaea and Bacteria Were Anaerobes Whereas the Ancestor of the Eukarya Domain Was an Aerobe
TLDR
The LUCA was an anaerobic 'organism', as were the ancestors of Archaea and Bacteria, whereas the ancestor of Eukarya was an aerobe, according to the reconstruction of the ancestral sequences of proteins. Expand
Parallel adaptations to high temperatures in the Archaean eon
TLDR
It is shown that both rRNA and protein sequences analysed with advanced, realistic models of molecular evolution provide independent support for two environmental-temperature-related phases during the evolutionary history of the tree of life. Expand
The first lines of divergence in the Bacteria domain were the hyperthermophilic organisms, the Thermotogales and the Aquificales, and not the mesophilic Planctomycetales
TLDR
The phylogenetic analysis carried out using five different methods has shown that, contrary to what is reported in the literature, 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. Expand
Extremophiles and the Origin of Life
TLDR
The diversity of environmental conditions under which prokaryotes can thrive should be understood as evidence of their adaptability and not as evidence that the origin of life took place under extreme conditions. Expand
Extremely thermophilic translation system in the common ancestor commonote: ancestral mutants of Glycyl-tRNA synthetase from the extreme thermophile Thermus thermophilus.
TLDR
The ancestral mutant enzymes involved in metabolic systems show higher thermal stability than wild-type enzymes, consistent with the hyperthermophile common ancestor hypothesis, and an extremely thermophilic translation system in the common ancestor Commonote is suggested. Expand
A methanogen hosted the origin of the genetic code.
TLDR
A comparison is made between orthologous proteins from a methanogen and a non-methanogen in order to determine the amino acid substitution pattern, and it is shown that the MI value associated to the genetic code is not different from the mean value of the MI deriving from methanogenic proteins, but it differs from themean MI of non-Methanogenic proteins. Expand
The Common Ancestor of All Modern Life
TLDR
It is suggested that the universal ancestor was a thermophile or hyperthermophile that thrived at a very high temperature and surrounded by a cell membrane similar to those found in modern bacteria and eukaryotes. Expand
Characterization of Reconstructed Ancestral Proteins Suggests a Change in Temperature of the Ancient Biosphere
TLDR
Experimental data supports the idea that only thermophilic ancestors survived the catastrophic increase in temperature of the biosphere that was likely associated with meteorite impacts during the early history of Earth. Expand
The Very Early Stages of Biological Evolution and the Nature of the Last Common Ancestor of the Three Major Cell Domains
TLDR
Although the gene complement of the cenancestor includes sequences that may have originated in different epochs, the extraordinary conservation of RNA-related sequences supports the hypothesis that the last common ancestor was an evolutionary outcome of the so-called RNA/protein world. Expand
...
1
2
3
4
5
...

References

SHOWING 1-10 OF 44 REFERENCES
The universal ancestor was a thermophile or a hyperthermophile: tests and further evidence.
TLDR
By reconstructing the ancestral sequences of the various ancestors using methods based on maximum likelihood and maximum parsimony, these sequences can be attributed to the mesophiles or (hyper)thermophiles and the following conclusions can be drawn. Expand
The universal ancestor lived in a thermophilic or hyperthermophilic environment.
TLDR
If the LUCA was a progenote then the origin of life might have taken place at a high temperature, and the rRNA ancestral sequences reconstructed with maximum parsimony are to suggest that theLUCA lived in a thermophilic or hyperthermophilic environment. Expand
The universal ancestor was a thermophile or a hyperthermophile
TLDR
The thermophily index of all the reconstructed ancestral sequences of theLUCA belongs to the set of the thermophile/hyperthermophile sequences, thus supporting the hypotheses that see the LUCA as a thermophile or a hypertherMophile. Expand
The ancestor of the Bacteria domain was a hyperthermophile.
TLDR
The phylogeny of ribosomal RNA using only multiple alignment positions with no phylogenetic noise concludes that the first branch of divergence in the Bacteria domain comprises Planctomycetales and not hyperthermophile bacteria as in classic phylogeny. Expand
About the last common ancestor, the universal life‐tree and lateral gene transfer: a reappraisal
TLDR
It would appear that the role of lateral gene transfer was overemphasized in recent discussions of molecular phylogenies; that the LCA was probably a non‐thermophilic protoeukaryote from which both Archaea and Bacteria emerged by reductive evolution but not as sister groups, in keeping with a current evolutionary scheme for the biosynthesis of membrane lipids. Expand
Thermoreduction, a hypothesis for the origin of prokaryotes.
  • P. Forterre
  • Biology, Medicine
  • Comptes rendus de l'Academie des sciences. Serie III, Sciences de la vie
  • 1995
TLDR
2 new hypotheses are proposed to explain the correlation between the procaryotic phenotype and thermophilic life without reference to a putative hot origin of life, suggesting that today prokaryotes might have originated from mesophilic ancestors via reductive evolution, in the process of adaptation to thermophily. Expand
Genomics and early cellular evolution. The origin of the DNA world.
  • P. Forterre
  • Biology, Medicine
  • Comptes rendus de l'Academie des sciences. Serie III, Sciences de la vie
  • 2001
TLDR
It is suggested here that DNA and DNA replication mechanisms appeared first in the virus world before being transferred into cellular organisms and further comparative studies on informational mechanisms in the three domains should help to resolve this critical question. Expand
Phylogeny: A non-hyperthermophilic ancestor for Bacteria
TLDR
It is found that hyperthermophilic bacteria (such as Aquificales and Thermotogales) do not emerge first, suggesting that the Bacteria had a non-hypertherMophilic ancestor, and it seems that Planctomycetales, a phylum with numerous peculiarities, could be the first emerging bacterial group. Expand
The winds of (evolutionary) change: breathing new life into microbiology.
TLDR
The split between the Archaea and the Bacteria is now recognized as the primary phylogenetic division and that the Eucarya have branched from the same side of the tree as the archaea. Expand
Bacterial molecular phylogeny using supertree approach.
TLDR
A new method based on supertree construction is used, which permits to cumulate in one supertree the information and statistical support of hundreds of trees from orthologous gene families and to build the phylogeny of 33 prokaryotes and four eukaryotes with completely sequenced genomes, which demonstrates that a phylogenY of proKaryotic species is conceivable and challenges the hypothesis of a thermophilic origin of bacteria and present-day life. Expand
...
1
2
3
4
5
...