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Phylogenetic analysis of DNA sequences often downweights third positions. However, this study found third positions contain more phylogenetic information than first or second positions, challenging common practice.

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Area of Science:

  • Molecular Evolution
  • Bioinformatics
  • Phylogenetics

Background:

  • Third codon positions in DNA sequences are frequently downweighted or excluded in phylogenetic analyses.
  • This practice is based on the assumption that higher substitution rates at third positions introduce more noise than valuable phylogenetic signal.

Purpose of the Study:

  • To empirically test the common assumption that third codon positions are less reliable for phylogenetic inference compared to first and second positions.
  • To evaluate the phylogenetic content of individual codon positions (1st, 2nd, and 3rd) in vertebrate DNA sequence data.

Main Methods:

  • Ten vertebrate datasets were partitioned into three subsets, each containing only first, second, or third codon positions.
  • Phylogenetic performance of these subsets was assessed using established methods for evaluating phylogenetic data content.

Main Results:

  • Contrary to expectations, third codon positions demonstrated superior phylogenetic performance (3rd > 1st > 2nd).
  • The results indicate that downweighting third positions in favor of second positions is not supported by the data.

Conclusions:

  • The study challenges the default downweighting of third codon positions in phylogenetic analyses.
  • Unless specific evidence of misleading information exists, third codon positions should be retained and analyzed for their phylogenetic value.