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Evolution of cysteine proteinases in eukaryotes

A L Hughes1

  • 1Department of Biology, Pennsylvania State University, University Park 16802.

Molecular Phylogenetics and Evolution
|December 1, 1994
PubMed
Summary

Cysteine proteinase genes duplicated early in eukaryote evolution. In parasitic nematodes, these genes show rapid evolution driven by positive selection, particularly in substrate-binding regions.

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Reply from austin hughes.

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Area of Science:

  • Evolutionary biology
  • Molecular genetics
  • Biochemistry

Background:

  • Cysteine proteinases are a major enzyme family in eukaryotes.
  • This family has undergone extensive gene duplication throughout evolutionary history.
  • Gene duplication events occurred early in eukaryote evolution, predating divergence of major lineages.

Purpose of the Study:

  • To investigate the evolutionary history of cysteine proteinase gene families.
  • To understand the diversification patterns of these genes in parasitic organisms.
  • To identify the evolutionary pressures shaping cysteine proteinase genes in parasites.

Main Methods:

  • Phylogenetic analysis of eukaryotic cysteine proteinase genes.
  • Comparative analysis of gene families in metazoan and protist parasites.
  • Sequence analysis of Haemonchus contortus cysteine proteinase genes.
  • Statistical analysis of DNA sequences to detect selection pressures.

Main Results:

  • Cysteine proteinase genes duplicated early in eukaryote evolution, with examples in protists, plants, and animals.
  • Metazoan parasite cysteine proteinases form a distinct subfamily clustering with mammalian cathepsin B.
  • Protist parasite genes cluster separately.
  • Five Haemonchus contortus genes evolved via duplication within the last 200 million years.
  • These genes exhibit significant charge differences, especially near the substrate-binding cleft.
  • Analysis indicates positive natural selection favored charge-changing substitutions in these regions.

Conclusions:

  • The cysteine proteinase gene family has a deep evolutionary history marked by early gene duplications.
  • Parasitic organisms harbor distinct subfamilies of cysteine proteinases.
  • Recent gene duplications and positive selection have driven diversification in parasitic nematode cysteine proteinases.
  • Evolutionary adaptation in parasitic cysteine proteinases may involve alterations in substrate-binding regions.

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