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Transitions, transversions, and the molecular evolutionary clock.

T H Jukes1

  • 1Space Sciences Laboratory, University of California, Berkeley 94720.

Journal of Molecular Evolution
|January 1, 1987
PubMed
Summary

Nucleotide substitutions, including transitions and transversions, are key to evolution. Their varying frequencies may be influenced by mutator genes affecting DNA replication.

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Area of Science:

  • Molecular Biology
  • Evolutionary Biology
  • Genetics

Background:

  • Nucleotide substitutions, specifically transitions and transversions, are fundamental mechanisms driving evolutionary changes in genetic sequences.
  • These substitutions can be systematically analyzed by comparing homologous gene sequences.
  • Understanding the patterns of these changes provides insights into evolutionary processes.

Purpose of the Study:

  • To compile and categorize various subclasses of transitional and transversional nucleotide substitutions.
  • To investigate the relative proportions of transitions versus transversions across different genes.
  • To explore potential causes for variations in substitution frequencies, such as the role of mutator genes.

Main Methods:

  • Alignment of homologous gene sequences to identify nucleotide substitutions.
  • Classification of substitutions into transitions (purine-purine, pyrimidine-pyrimidine) and transversions (purine-pyrimidine).
  • Analysis of substitution patterns within codon third positions, considering family boxes and two-codon sets.

Main Results:

  • Compilation of various subclasses of transitional and transversional nucleotide substitutions from comparative gene analyses.
  • Observed considerable variations in the relative frequencies of transitions and transversions among genes.
  • Identified that transitions are generally more frequent in early evolutionary divergence, with notable exceptions.

Conclusions:

  • The observed variations in transition-transversion ratios may be attributed to mutator genes influencing DNA replication fidelity.
  • No evidence suggests that transversions commonly arise from multiple sequential transition events.
  • The study provides a detailed compilation and analysis of nucleotide substitution patterns relevant to evolutionary genetics.

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