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Biological Polymers: Evolution, Function, and Significance.

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Biopolymer backbones show hallmarks of evolution, suggesting non-Darwinian processes on early Earth. This challenges conventional models and offers new insights into the origins of life and biochemistry.

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Area of Science:

  • Biochemistry and evolutionary biology
  • Astrobiology and origins of life research

Background:

  • Biopolymer sequences evolve via Darwinian processes, but backbone origins remain uncertain.
  • Understanding biopolymer origins is crucial for biochemistry, biology, and astrobiology.

Purpose of the Study:

  • To determine if biopolymer backbone characteristics indicate evolutionary origins.
  • To explore mechanistic models for pre-Darwinian evolutionary processes of biopolymers.

Main Methods:

  • Established criteria to distinguish evolutionary from non-evolutionary chemical species.
  • Compiled and evaluated shared properties of polypeptide, polynucleotide, and polyglycan backbones.
  • Analyzed biopolymer properties including kinetic trapping, polyfunction, function-switching, and complementarity.

Main Results:

  • Biopolymer backbones are kinetically trapped, thermodynamically unstable, and exhibit polyfunction and function-switching.
  • Biopolymers display complementarity and access recalcitrant states, with emergent properties upon polymerization.
  • Biopolymer backbones exhibit hallmarks of evolution, inconsistent with purely chemical, physical, or geological processes.

Conclusions:

  • Biopolymer backbones likely arose from non-Darwinian coevolution driven by hydrolytic stress on early Earth.
  • Evolved biopolymer backbones facilitated the transition from chemical to Darwinian evolution.
  • This model challenges conventional prebiotic synthesis views, supporting iterative chemical sculpting and exaptation.