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Amino acid sequences in phylogenetic analysis can obscure evolutionary relationships due to convergence, unlike nucleotide sequences. This study highlights how amino acid coding may introduce homoplasy, impacting phylogenetic tree construction.

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Area of Science:

  • Evolutionary biology
  • Molecular evolution
  • Bioinformatics

Background:

  • Phylogenetic analyses commonly utilize nucleotide or amino acid sequences.
  • Amino acid sequences are often preferred for their ability to correct for saturation (parallelism).

Purpose of the Study:

  • To investigate the impact of using amino acid sequence characters versus nucleotide sequence characters in phylogenetic analyses.
  • To identify potential issues arising from amino acid coding, such as convergence and loss of informative variation.

Main Methods:

  • Comparative analysis of phylogenetic character coding using nucleotide and amino acid sequences.
  • Evaluation of homoplasy and phylogenetic signal using consistency index.
  • Examination of tree-construction method outcomes under different coding schemes.

Main Results:

  • Amino acid characters, while correcting for saturation, are prone to convergence, potentially masking true evolutionary relationships.
  • Nucleotide sequence characters can retain phylogenetically informative variation that may be lost or obscured in amino acid coding.
  • Differences in coding can lead to conflicting phylogenetic groupings, affecting the reliability of evolutionary inferences.

Conclusions:

  • Coding amino acid sequences instead of nucleotide sequences can introduce convergence problems in phylogenetic analyses.
  • The choice of character coding significantly impacts the accuracy and reliability of phylogenetic tree reconstruction.
  • Careful consideration of character delimitation is crucial for robust phylogenetic inference, as demonstrated by the Mhc locus example.