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On the origin and evolution of the genetic code

A Jiménez-Sánchez1

  • 1Departmento de Bioquímica, Biología Molecular y Genética, Universidad de Extremadura, Badajoz, Spain.

Journal of Molecular Evolution
|December 1, 1995
PubMed
Summary
This summary is machine-generated.

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The genetic code likely evolved from a simple RNA-based system with few letters and codons. This system gradually incorporated more letters and codons, eventually leading to the modern genetic code and the later appearance of DNA.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Evolutionary Biology

Background:

  • The origin of the genetic code is debated, with theories including "frozen accident" and "chemical interaction."
  • The current genetic code (64 codons for 20 amino acids) is complex, suggesting an evolutionary origin from a simpler state.

Purpose of the Study:

  • To propose an evolutionary pathway for the genetic code's origin and development.
  • To investigate the potential initial structure of the genetic code in an RNA world.

Main Methods:

  • Analysis of the genetic code using information theory.
  • Examination of the metabolism of pyrimidine biosynthesis.

Main Results:

  • Evidence suggests an early RNA world code with two letters (A, U) forming eight triplets for seven amino acids and one stop signal.

Related Experiment Videos

  • The code likely expanded by incorporating G and C, reaching 64 triplets for 20 amino acids and three stop signals.
  • DNA may have emerged after the four-letter code was established, with Thymine (T) replacing Uracil (U) for stability.

    • Conclusions:

    • The genetic code evolved incrementally from a simpler precursor.
    • An RNA-based system likely preceded the DNA-based system, with gradual increases in coding capacity and complexity.