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Transitions, transversions, and the molecular evolutionary clock

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Summary

Nucleotide substitutions in the form of transitions (purine-purine or pyrimidine-pyrimidine interchanges) and transversions (purine-pyrimidine interchanges) occur during evolution and may be complied by aligning the sequences of homologous genes. Referring to the genetic code tables, silent transitions take place in third positions of codons in family boxes and two-codon sets. Silent transversions in third positions occur only in family boxes, except for A⇋C transversions between AGR and CGR arginine codons (R=A or G). Comparisons of several protein genes have been made, and various subclasses of transitional and transversional nucleotide substitutions have been compiled. Considerable variations occur among the relative proportions of transitions and transversions. Such variations could possibly be caused by mutator genes, favoring either transitions or, conversely, transversions, during DNA replication. At earlier stages of evolutionary divergence, transitions are usually more frequent, but there are exceptions. No indication was found that transversions usually originate from multiple substitutions in transitions.

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Jukes, T.H. Transitions, transversions, and the molecular evolutionary clock. J Mol Evol 26, 87–98 (1987). https://doi.org/10.1007/BF02111284

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  • DOI: https://doi.org/10.1007/BF02111284

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