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The concept of cellular evolution

C R Woese, G E Fox

    Journal of Molecular Evolution
    |September 20, 1977
    PubMed
    Summary
    This summary is machine-generated.

    The eukaryotic cytoplasm may represent a distinct evolutionary lineage from bacteria, diverging from a simpler common ancestor called the progenote. This challenges traditional views of cellular evolution and prokaryotic development.

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    Area of Science:

    • Evolutionary biology
    • Cellular biology
    • Phylogenetics

    Background:

    • The evolutionary origin of eukaryotic cells remains a central question in biology.
    • Understanding the relationship between prokaryotic and eukaryotic domains is crucial for reconstructing early life.

    Purpose of the Study:

    • To investigate whether the eukaryotic cytoplasm represents a distinct evolutionary lineage separate from bacteria.
    • To explore the implications of translation mechanism differences for phylogenetic analysis.

    Main Methods:

    • Comparative analysis of translation mechanisms in eukaryotic and bacterial systems.
    • Phylogenetic inference based on molecular data.

    Main Results:

    • Differences in translation mechanisms suggest separate evolutionary trajectories for eukaryotic and bacterial lines.

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  • Both lines appear to have independently evolved to a prokaryotic level of organization.
  • A common ancestor, simpler than a prokaryote and termed the 'progenote', is proposed.

    • Conclusions:

    • The eukaryotic cytoplasm likely evolved independently from the bacterial lineage.
    • The progenote concept offers a new perspective on early cellular evolution and the genotype-phenotype link.