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Structuring of the genetic code took place at acidic pH.

Massimo Di Giulio1

  • 1Institute of Genetics and Biophysics Adriano Buzzati Traverso, CNR, Via G. Marconi 10, 80125 Naples, Napoli, Italy. digiulio@igb.cnr.it

Journal of Theoretical Biology
|June 28, 2005
PubMed
Summary

The genetic code may have originated in an acidic environment. Basic amino acids, encoded by more codons, correlate with higher isoelectric points and molecular weights, suggesting early life favored acidic conditions.

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Area of Science:

  • Biochemistry
  • Evolutionary Biology
  • Genetics

Background:

  • The origin of the genetic code is a fundamental question in evolutionary biology.
  • Intracellular pH is a critical factor influencing biochemical processes and protein structure.

Purpose of the Study:

  • To investigate the relationship between amino acid properties, codon usage, and intracellular pH.
  • To hypothesize about the environmental conditions under which the genetic code evolved.

Main Methods:

  • Multiple regression analysis to correlate codon number with amino acid isoelectric point and molecular weight.
  • Comparison of protein acidophily index (AI) in organisms with different intracellular pH.
  • Definition of amino acid acidophily ranks.

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Main Results:

  • A positive correlation was found between the number of codons for an amino acid and its isoelectric point and molecular weight.
  • Basic amino acids are encoded by more codons on average.
  • The calculated acidophily index (AI) of the genetic code aligns with that of proteins from organisms with acidic intracellular pH.

Conclusions:

  • The findings support the hypothesis that the genetic code's structure originated in an acidic intracellular environment.
  • The observed codon bias suggests an evolutionary adaptation to specific pH conditions.