Evidence for Methanogenic Origin of Archaea and Eukaryotes
Author Information
Author(s): Kelly S., Wickstead B., Gull K.
Primary Institution: University of Oxford
Hypothesis
Is there a methanogenic origin of the Archaea and a thaumarchaeal origin for the eukaryotes?
Conclusion
The study provides evidence supporting a methanogenic origin of the Archaea and suggests that eukaryotes may have originated from a lineage related to Thaumarchaea.
Supporting Evidence
- The study identified 3537 discrete orthologous groups across archaeal genomes.
- Phylogenetic analyses suggest a close relationship between Archaea and Eukarya.
- Evidence indicates that methanogenesis was likely the ancestral form of energy metabolism in early Archaea.
Takeaway
Scientists found that the earliest Archaea likely produced methane, and eukaryotes might have come from a group of Archaea called Thaumarchaea.
Methodology
The study used a machine-learning approach to identify 3537 discrete orthologous protein sequence groups across archaeal genomes and analyzed their phylogenetic relationships using Bayesian and maximum-likelihood methods.
Limitations
The study may be limited by the potential for hidden paralogy within the dataset and the challenges of lateral gene transfer.
Digital Object Identifier (DOI)
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