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Life before RNA.

Stephen J Sowerby1, George B Petersen

  • 1Global Technologies (NZ) Ltd., Dunedin, New Zealand. stephen@glotec.co.nz

Astrobiology
|January 18, 2003
PubMed
Summary
This summary is machine-generated.

Challenging the linear polymer hypothesis for life's origin, this study proposes that purine bases on mineral surfaces could have encoded early biological information via template-directed peptide catalysis, offering a novel origin of life theory.

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Primordial coding of amino acids by adsorbed purine bases.

Origins of life and evolution of the biosphere : the journal of the International Society for the Study of the Origin of Life·2002
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Area of Science:

  • Origin of Life Studies
  • Biochemistry
  • Astrobiology

Background:

  • The prevailing hypothesis for life's origin involves self-replicating linear informational molecules.
  • This paradigm lacks substantial direct experimental validation.
  • Alternative mechanisms for early genetic coding warrant investigation.

Purpose of the Study:

  • To critically evaluate the de novo emergence of self-replicating polymers.
  • To propose and explore an alternative hypothesis for protobiological information encoding.
  • To investigate the potential role of adsorbed purine bases in early genetic coding.

Main Methods:

  • Review and critique of existing hypotheses on the origin of life.
  • Theoretical examination of template-directed coding by adsorbed purine bases.

Related Experiment Videos

  • Analysis of purine base self-organization on mineral surfaces.

    • Main Results:

    • Fundamental objections are raised against the spontaneous formation of linear, self-replicating polymers.
    • Purine bases can self-organize into 2D molecular solids on mineral surfaces.
    • These molecular arrangements exhibit aperiodic complexity capable of encoding information.

    Conclusions:

    • Adsorbed purine bases on mineral surfaces offer a plausible alternative for early genetic coding.
    • The self-organization, information persistence, enantiomorphism, and amino acid discrimination of these bases support a primitive genetic mechanism.
    • This model provides a potential pathway for life's emergence distinct from linear polymers.