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On the origin of the genetic code.

Masayuki Seki1

  • 1Division of Biochemistry, Faculty of Pharmaceutical Sciences, Tohoku Medical and Pharmaceutical University.

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|April 9, 2023
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Summary
This summary is machine-generated.

The genetic code likely emerged from sequential selective pressures, with early aminoacyl-RNAs acting as ribozyme subunits. This model explains the code's origin without direct amino acid-codon relationships.

Keywords:
RNA worldgenetic coderibosomeribozymetranslation

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Area of Science:

  • Origin of Life
  • Molecular Evolution
  • Biochemistry

Background:

  • The precise mechanisms by which Darwinian selection generated the genetic code remain largely unexplained.
  • Understanding the genetic code's origin is crucial for deciphering early life evolution.

Purpose of the Study:

  • To propose a novel hypothesis for the emergence of the genetic code driven by sequential selective pressures.
  • To elucidate the role of early aminoacyl-RNAs and ribozymes in genetic code formation.

Main Methods:

  • Hypothesizing a model based on sequential selective pressures and ribozyme evolution.
  • Predicting the function of aminoacyl-RNAs as cartridge-type subunits in multi-subunit ribozymes.
  • Analyzing the potential impact of proto P-site duplication on ribozyme complexity.

Main Results:

  • Aminoacyl-RNAs for specific amino acids were likely selected as early ribozyme subunits.
  • No initial direct relationship between amino acids and codon/anticodon pairs is predicted.
  • Duplication of ribozyme sites could lead to multi-subunit interactions and the emergence of metabolic pathways.

Conclusions:

  • Darwinian selection, acting on sequential pressures, likely shaped the primary genetic code for catalytic amino acids.
  • The proposed model provides a framework for understanding the evolution of the protein translation system.
  • Further research can explore the detailed events leading to the "frozen" genetic code.