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Takeover mechanisms and early biochemical evolution

A G Cairns-Smith

    Bio Systems
    |September 1, 1977
    PubMed
    Summary
    This summary is machine-generated.

    Evolutionary biology reveals how structures gain new functions. Early life likely utilized polynucleotides before proteins, with even nucleic acids evolving from simpler genetic materials.

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    Area of Science:

    • Biochemistry
    • Evolutionary Biology
    • Molecular Biology

    Background:

    • Biological structures often acquire new functions beyond their original purpose.
    • Recent evolution frequently involves repurposing existing molecular machinery.

    Purpose of the Study:

    • To propose a model for how evolutionary 'takeovers' drive biochemical innovation.
    • To explore the potential roles of polynucleotides and proteins in early life.

    Main Methods:

    • Conceptual analysis of evolutionary pathways.
    • Hypothesizing molecular function transitions.

    Main Results:

    • Protein recognition and control mechanisms may have replaced earlier functional systems.
    • Polynucleotides might have been prevalent in a pre-protein era.

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  • Nucleic acids themselves may have originated from simpler genetic materials.

    • Conclusions:

    • Evolutionary 'takeovers' are a significant route to novel biochemical designs.
    • The transition from simpler genetic materials to nucleic acids and then proteins shaped early life.