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Heterotachy and functional shift in protein evolution.

Hervé Philippe1, Didier Casane, Simonetta Gribaldo

  • 1Canadian Institute for Advanced Research, Département de Biochimie, Université de Montréal, Succursale Centre-Ville, Montréal, Québec H3C3J7, Canada. herve.philippe@umontreal.ca

IUBMB Life
|July 26, 2003
PubMed
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Evolutionary analysis reveals that specific amino acid changes at slowly evolving protein sites, not general rate shifts (heterotachy), indicate functional divergence after gene duplication. This aids in understanding protein function and drug design.

Area of Science:

  • Protein engineering and bioinformatics
  • Computational biology and evolutionary genomics

Background:

  • Understanding protein structure-function relationships is crucial for drug design and protein modification.
  • Current rational design methods are less efficient than irrational approaches, highlighting gaps in knowledge.
  • Genome projects provide vast data for novel in silico evolutionary methods.

Purpose of the Study:

  • To investigate evolutionary approaches for predicting protein function in duplicated genes (paralogs).
  • To re-evaluate the utility of 'heterotachous sites' as indicators of functional divergence.
  • To identify reliable evolutionary markers for functional divergence in multi-gene families.

Main Methods:

  • Comparative analysis of homologous sequence positions in paralogs using in silico evolutionary methods.

Related Experiment Videos

  • Examination of substitution rate variations ('heterotachy') across protein evolution.
  • Analysis of amino acid substitutions at slowly evolving sites following gene duplication.

    • Main Results:

    • Heterotachy is a general phenomenon, not specific to functional divergence, occurring in most variable sites.
    • Substitution rate switches are frequent in both paralogous and orthologous comparisons.
    • Substitutions at generally slowly evolving (constrained) sites are more frequent soon after gene duplication and may indicate functional divergence.

    Conclusions:

    • Heterotachy reflects general protein evolutionary processes, not specific functional shifts.
    • Substitutions at constrained sites after gene duplication are promising indicators of functional divergence.
    • Combining structural and evolutionary data is key for functional characterization of multi-gene families.