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Related Experiment Videos

The molecular roots of compositional inheritance.

D Segré1, B Shenhav, R Kafri

  • 1Department of Molecular Genetics and The Crown Genome Center, The Weizmann Institute of Science, Rehovot, 76100, Israel.

Journal of Theoretical Biology
|December 12, 2001
PubMed
Summary
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Non-covalent molecular assemblies offer a primitive inheritance mechanism. High reproduction fidelity depends on lognormal catalytic rates and optimal assembly size, crucial for early life evolution.

Area of Science:

  • Origin of Life Research
  • Systems Chemistry
  • Biophysics

Background:

  • Non-covalent compositional assemblies present an alternative inheritance mechanism to biopolymers.
  • These assemblies are central to
  • Metabolism First
  • origin of life scenarios and the Graded Autocatalysis Replication Domain (GARD) model.

Purpose of the Study:

  • To analyze the quantitative molecular basis of inheritance in non-covalent assemblies.
  • To define conditions favoring high reproduction fidelity in early pre-biotic systems.

Main Methods:

  • Development of a novel heritability measure, eta(*)(s).
  • Analysis of the dependence of reproduction fidelity on molecular recognition parameters and assembly size.

Related Experiment Videos

  • Investigating the impact of different distributions (normal vs. lognormal) of catalytic rate acceleration coefficients.

    • Main Results:

    • Reproduction fidelity (eta(*)(s)) is sensitive to molecular recognition parameters and assembly size.
    • Normal distribution of catalytic rates leads to
    • compositional error catastrophes
    • , preventing information transfer.
    • Lognormal distribution of catalytic rates, consistent with statistical formalisms, yields high reproduction fidelity.
    • Optimal assembly size for maximal fidelity is approximately 3.5 N(G)/lambda.

    Conclusions:

    • The distribution of catalytic rates and assembly size are critical factors for pre-biotic inheritance.
    • Lognormal distributions of catalytic rates are essential for high-fidelity information transfer in early life.
    • These findings delineate physicochemical conditions conducive to the emergence of pre-biotic evolution.