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Amino acid exchangeability and the adaptive code hypothesis.

Arlin Stoltzfus1, Lev Y Yampolsky

  • 1Center for Advanced Research in Biotechnology, 9600 Gudelsky Drive, Rockville, MD 20850, USA. arlin.stoltzfus@nist.gov

Journal of Molecular Evolution
|September 27, 2007
PubMed
Summary
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The genetic code

Area of Science:

  • Biochemistry
  • Evolutionary Biology
  • Genetics

Background:

  • The organization of the genetic code, assigning codons to amino acids, has long been debated regarding its adaptive nature.
  • Previous studies faced challenges due to limited comparative data on primordial codes and objective measures of amino acid exchangeability.

Purpose of the Study:

  • To evaluate hypotheses on the adaptiveness of the genetic code using a novel measure of amino acid exchangeability.
  • To differentiate between adaptive organization and evolutionary artifacts in amino acid-codon assignments.

Main Methods:

  • Utilized a recently developed measure of amino acid exchangeability.
  • Assessed a null hypothesis (no tendency for exchangeable amino acids to map to similar codons) and two alternative hypotheses (incremental evolution vs. true adaptation).

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Main Results:

  • The null hypothesis was rejected, confirming a nonrandom tendency in amino acid-codon assignments.
  • Most of the observed nonrandomness is attributable to incremental code evolution mechanisms (e.g., ambiguity reduction, codon capture).
  • A small residual orderliness suggests a potential, albeit minor, role for direct code adaptation.

Conclusions:

  • The study provides evidence that incremental evolutionary processes largely explain the structure of the genetic code.
  • While adaptation may play a small role, the observed patterns are primarily a consequence of evolutionary mechanisms rather than direct selection for robustness.