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Related Experiment Videos

Glutamine synthetase gene evolution: a good molecular clock.

G Pesole1, M P Bozzetti, C Lanave

  • 1Dipartimento di Biochimica e Biologia Molecolare, Universitá di Bari, Italy.

Proceedings of the National Academy of Sciences of the United States of America
|January 15, 1991
PubMed
Summary

The evolution of glutamine synthetase genes across diverse organisms revealed a regular pattern, allowing for the construction of phylogenetic trees. Gene duplication in chloroplasts occurred after endosymbiotic events, driven by species

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Area of Science:

  • Molecular evolution
  • Genomics
  • Biochemistry

Background:

  • Glutamine synthetase (EC 6.3.1.2) is a crucial enzyme found in various life forms, including animals, plants, and bacteria.
  • Understanding the evolutionary history of genes like glutamine synthetase provides insights into fundamental biological processes and organismal relationships.

Purpose of the Study:

  • To investigate the evolutionary trajectory of the glutamine synthetase gene across diverse taxa.
  • To reconstruct phylogenetic relationships using molecular evolutionary models.
  • To determine the origin and timing of glutamine synthetase gene duplications in organelles.

Main Methods:

  • Application of a general stationary Markov model to analyze glutamine synthetase gene sequences.
  • Construction of phylogenetic trees to infer evolutionary relationships.

Related Experiment Videos

  • Calculation of divergence times for organelle-specific glutamine synthetase enzymes.

    • Main Results:

    • The evolutionary process of the glutamine synthetase gene exhibited unexpected regularity, even across vast evolutionary timescales (e.g., prokaryote-eukaryote divergence).
    • Phylogenetic trees were successfully constructed for species with challenging fossil records.
    • Evidence suggests that pea and bean chloroplast glutamine synthetase genes arose from nuclear gene duplication, linked to metabolic adaptations.
    • Duplication of plastid glutamine synthetase genes occurred significantly after the endosymbiotic events that established organelles.

    Conclusions:

    • The study highlights the utility of molecular clock models in reconstructing evolutionary history and understanding gene evolution.
    • The findings support a model where organelle gene evolution is influenced by the host organism's metabolic requirements.
    • The timing of gene duplication relative to endosymbiosis provides crucial insights into organelle genome dynamics.