Evolution: Revisiting the Root of the Eukaryote Tree

@article{Roger2009EvolutionRT,
  title={Evolution: Revisiting the Root of the Eukaryote Tree},
  author={Andrew J. Roger and Alastair G. B. Simpson},
  journal={Current Biology},
  year={2009},
  volume={19},
  pages={R165-R167}
}

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References

SHOWING 1-10 OF 21 REFERENCES
Eukaryotic evolution, changes and challenges
TLDR
The idea that some eukaryotes primitively lacked mitochondria and were true intermediates in the prokaryote-to-eukaryote transition was an exciting prospect, but the evolutionary gap between proKaryotes and eUKaryotes is now deeper, and the nature of the host that acquired the mitochondrion more obscure, than ever before.
Early evolution and the origin of eukaryotes
Rooting the Eukaryote Tree by Using a Derived Gene Fusion
TLDR
It is shown that all eukaryote groups ancestrally with two cilia (bikonts) are evolutionarily derived and the root lies between bIKonts and opisthokonts (animals, Fungi, Choanozoa).
Evolutionary position of breviate amoebae and the primary eukaryote divergence
TLDR
It is shown that phylogenomics of phylogenetically ‘nomadic’ species can elucidate key questions in eukaryote evolution and establish Breviata as a deep-branching unikont, and remnants of mitochondria have been detected in all putatively deep-BRanching amitochondriate organisms.
Phylogenomics reveals a new ‘megagroup’ including most photosynthetic eukaryotes
TLDR
This work investigates early evolution among the major eukaryotic supergroups using the broadest multigene dataset to date and provides strong support for the clustering of plants, chromalveolates, rhizarians, haptophytes and cryptomonads, thus linking nearly all photosynthetic lineages and raising the question of a possible unique origin of plastids.
The real ‘kingdoms’ of eukaryotes
The phagotrophic origin of eukaryotes and phylogenetic classification of Protozoa.
  • T. Cavalier-smith
  • Biology
    International journal of systematic and evolutionary microbiology
  • 2002
TLDR
It is argued that the essentially autogenous origins of most eukaryotic cell properties (phagotrophy, endomembrane system including peroxisomes, cytoskeleton, nucleus, mitosis and sex) partially overlapped and were synergistic with the symbiogenetic origin of mitochondria from an alpha-proteobacterium.
The origin and diversification of eukaryotes: problems with molecular phylogenetics and molecular clock estimation
  • A. Roger, L. Hug
  • Biology
    Philosophical Transactions of the Royal Society B: Biological Sciences
  • 2006
TLDR
Estimating the divergence dates between the major eukaryote lineages using molecular analyses is even more difficult than phylogenetic estimation, and confidence intervals on inferred dates can be very large.
Evaluating Support for the Current Classification of Eukaryotic Diversity
TLDR
It is demonstrated that supergroup taxonomies are unstable and that support for groups varies tremendously, indicating that the current classification scheme of eukaryotes is likely premature.
...
...