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Prokaryotic and eukaryotic cells represent two fundamental types of cellular organization, differing significantly in structure, complexity, and function. These distinctions underpin the biological diversity seen across domains of life.Prokaryotic Cell CharacteristicsProkaryotic cells, exemplified by bacteria and archaea, are structurally simple and lack membrane-bound organelles, including a nucleus. Their genetic material consists of a single, circular DNA molecule in the nucleoid region,...
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Using Phylogenetic Analysis to Investigate Eukaryotic Gene Origin
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Eukaryotes first: how could that be?

Carlos Mariscal1, W Ford Doolittle2

  • 1Departments of Philosophy, Dalhousie University, PO Box 15000, Halifax, Nova Scotia, Canada B3H 4R2 Biochemistry and Molecular Biology, Dalhousie University, PO Box 15000, Halifax, Nova Scotia, Canada B3H 4R2.

Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
|September 2, 2015
PubMed
Summary
This summary is machine-generated.

The eukaryotes-first (EF) hypothesis suggests prokaryotes evolved from complex eukaryotes, with bacteria and archaea losing features. This challenges traditional views of early life evolution and requires testing convergent prokaryotic evolution.

Keywords:
LECALUCAconvergenceeukaryotesstreamlining

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Area of Science:

  • Evolutionary Biology
  • Origin of Life
  • Cell Biology

Background:

  • The traditional prokaryote:eukaryote dichotomy has been challenged by 'eukaryotes-first' (EF) hypotheses.
  • EF scenarios propose the last universal common ancestor (LUCA) was complex, resembling modern eukaryotes.
  • Bacteria and Archaea are thus hypothesized to have secondarily lost complex features via 'streamlining'.

Purpose of the Study:

  • To explore the implications of eukaryotes-first (EF) evolutionary scenarios.
  • To investigate the concept of convergent prokaryotic evolution under EF models.
  • To propose methods for testing EF hypotheses and their evolutionary consequences.

Main Methods:

  • Conceptual analysis of evolutionary models.
  • Examination of phylogenetic frameworks, specifically the three-domain tree.
  • Discussion of potential experimental and comparative approaches.

Main Results:

  • EF scenarios, combined with the canonical three-domain tree (Archaea and Eukarya as sister groups), imply Bacteria and Archaea evolved prokaryotic features convergently.
  • This challenges the view of Archaea and Bacteria as distinct, ancient lineages retaining ancestral simplicity.
  • The implications for understanding LUCA and early cellular evolution are significant.

Conclusions:

  • Eukaryotes-first hypotheses necessitate a re-evaluation of prokaryotic diversity and evolution.
  • Convergent evolution of prokaryotic traits in Bacteria and Archaea is a key prediction of EF models.
  • Further research is needed to develop testable predictions for these evolutionary scenarios.