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A neutral evolution test derived from a theoretical amino acid substitution model.

Gabriel S Zamudio1, Francisco Prosdocimi2, Sávio Torres de Farias3

  • 1Theoretical Biology Group, Instituto de Investigaciones Biomédicas, Universidad Nacional Autónoma de México, CDMX, C.P, Ciudad de México 04510, Mexico.

Journal of Theoretical Biology
|February 4, 2019
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Summary

A new neutral evolution model integrates codons, amino acids, and genetic code degeneracy. This model refines neutral theory and provides a universal test for protein evolution analysis.

Keywords:
Negative selectionNeutral mutationsNeutrality testPositive selectionProtein evolution

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Area of Science:

  • Molecular Evolution
  • Bioinformatics
  • Computational Biology

Background:

  • The neutral theory of molecular evolution explains genetic variation without natural selection.
  • Existing models often simplify the complexities of genetic code and amino acid properties.
  • A more comprehensive model is needed to accurately assess protein evolution.

Purpose of the Study:

  • To develop a refined neutral evolution model incorporating codons, amino acids, and genetic code degeneracy.
  • To establish a universal neutral test for analyzing protein sequence evolution.
  • To provide a baseline for identifying amino acids under selection.

Main Methods:

  • Developed a stochastic process model from nucleotides to amino acids.
  • Incorporated codon and amino acid degeneracy.
  • Generalized the Jukes-Cantor model for amino acids.
  • Compared the new model with Jukes-Cantor and BLOSUM62 substitution models.

Main Results:

  • The model yields a stationary probability distribution of amino acids.
  • A neutral test was established for assessing protein sequence evolution.
  • Examples demonstrated the test's utility in identifying unusual amino acid frequencies.
  • The model's universality is comparable to the standard genetic code.

Conclusions:

  • The developed neutral evolution model offers a more nuanced understanding of molecular evolution.
  • The neutral test serves as a valuable tool for discerning selection pressures on proteins.
  • This approach enhances the analysis of protein sequences and evolutionary dynamics.