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Initial biases in short DNA pools disappear during replication, but positional biases emerge, leading to periodic structures. This finding aids understanding of molecular evolution from early Earth conditions.

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Area of Science:

  • Origin of life studies
  • Molecular evolution
  • Biochemistry

Background:

  • Molecular evolution requires oligonucleotide replication into longer polymers.
  • Prebiotic pools exhibit inherent biases in nucleobase composition.
  • The persistence and impact of these initial biases on replication remain unclear.

Purpose of the Study:

  • To investigate the persistence of initial nucleotide bias in short DNA pools during replication.
  • To determine how initial nucleotide bias affects the evolution of DNA sequences.
  • To explore the emergence of structure in elongated DNA sequences.

Main Methods:

  • Utilized an enzymatic model system to study the evolution of 12-mer biased short DNA pools.
  • Employed next-generation sequencing to analyze DNA pools at various time points.
  • Examined sequence composition and structure over extended, simulated evolutionary timescales.

Main Results:

  • The initial overall nucleotide bias of the DNA pool diminished after isothermal replication.
  • Positional nucleotide composition within elongated sequences remained biased and varied.
  • Highly periodic dimer and trimer motifs emerged in rapidly elongated DNA sequences.

Conclusions:

  • Templated replication can overcome initial pool biases while introducing positional biases and structure.
  • Emergent sequence composition and structure are crucial for molecular evolution from biased prebiotic pools.
  • This research provides insights into the transition from simple prebiotic chemistry to complex nucleic acids.